forked from Minki/linux
7262 lines
206 KiB
C
7262 lines
206 KiB
C
/*
|
|
* Kernel-based Virtual Machine driver for Linux
|
|
*
|
|
* This module enables machines with Intel VT-x extensions to run virtual
|
|
* machines without emulation or binary translation.
|
|
*
|
|
* Copyright (C) 2006 Qumranet, Inc.
|
|
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
|
|
*
|
|
* Authors:
|
|
* Avi Kivity <avi@qumranet.com>
|
|
* Yaniv Kamay <yaniv@qumranet.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "irq.h"
|
|
#include "mmu.h"
|
|
|
|
#include <linux/kvm_host.h>
|
|
#include <linux/module.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/highmem.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/ftrace_event.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/tboot.h>
|
|
#include "kvm_cache_regs.h"
|
|
#include "x86.h"
|
|
|
|
#include <asm/io.h>
|
|
#include <asm/desc.h>
|
|
#include <asm/vmx.h>
|
|
#include <asm/virtext.h>
|
|
#include <asm/mce.h>
|
|
#include <asm/i387.h>
|
|
#include <asm/xcr.h>
|
|
#include <asm/perf_event.h>
|
|
|
|
#include "trace.h"
|
|
|
|
#define __ex(x) __kvm_handle_fault_on_reboot(x)
|
|
#define __ex_clear(x, reg) \
|
|
____kvm_handle_fault_on_reboot(x, "xor " reg " , " reg)
|
|
|
|
MODULE_AUTHOR("Qumranet");
|
|
MODULE_LICENSE("GPL");
|
|
|
|
static int __read_mostly enable_vpid = 1;
|
|
module_param_named(vpid, enable_vpid, bool, 0444);
|
|
|
|
static int __read_mostly flexpriority_enabled = 1;
|
|
module_param_named(flexpriority, flexpriority_enabled, bool, S_IRUGO);
|
|
|
|
static int __read_mostly enable_ept = 1;
|
|
module_param_named(ept, enable_ept, bool, S_IRUGO);
|
|
|
|
static int __read_mostly enable_unrestricted_guest = 1;
|
|
module_param_named(unrestricted_guest,
|
|
enable_unrestricted_guest, bool, S_IRUGO);
|
|
|
|
static int __read_mostly emulate_invalid_guest_state = 0;
|
|
module_param(emulate_invalid_guest_state, bool, S_IRUGO);
|
|
|
|
static int __read_mostly vmm_exclusive = 1;
|
|
module_param(vmm_exclusive, bool, S_IRUGO);
|
|
|
|
static int __read_mostly yield_on_hlt = 1;
|
|
module_param(yield_on_hlt, bool, S_IRUGO);
|
|
|
|
static int __read_mostly fasteoi = 1;
|
|
module_param(fasteoi, bool, S_IRUGO);
|
|
|
|
/*
|
|
* If nested=1, nested virtualization is supported, i.e., guests may use
|
|
* VMX and be a hypervisor for its own guests. If nested=0, guests may not
|
|
* use VMX instructions.
|
|
*/
|
|
static int __read_mostly nested = 0;
|
|
module_param(nested, bool, S_IRUGO);
|
|
|
|
#define KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST \
|
|
(X86_CR0_WP | X86_CR0_NE | X86_CR0_NW | X86_CR0_CD)
|
|
#define KVM_GUEST_CR0_MASK \
|
|
(KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
|
|
#define KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST \
|
|
(X86_CR0_WP | X86_CR0_NE)
|
|
#define KVM_VM_CR0_ALWAYS_ON \
|
|
(KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST | X86_CR0_PG | X86_CR0_PE)
|
|
#define KVM_CR4_GUEST_OWNED_BITS \
|
|
(X86_CR4_PVI | X86_CR4_DE | X86_CR4_PCE | X86_CR4_OSFXSR \
|
|
| X86_CR4_OSXMMEXCPT)
|
|
|
|
#define KVM_PMODE_VM_CR4_ALWAYS_ON (X86_CR4_PAE | X86_CR4_VMXE)
|
|
#define KVM_RMODE_VM_CR4_ALWAYS_ON (X86_CR4_VME | X86_CR4_PAE | X86_CR4_VMXE)
|
|
|
|
#define RMODE_GUEST_OWNED_EFLAGS_BITS (~(X86_EFLAGS_IOPL | X86_EFLAGS_VM))
|
|
|
|
/*
|
|
* These 2 parameters are used to config the controls for Pause-Loop Exiting:
|
|
* ple_gap: upper bound on the amount of time between two successive
|
|
* executions of PAUSE in a loop. Also indicate if ple enabled.
|
|
* According to test, this time is usually smaller than 128 cycles.
|
|
* ple_window: upper bound on the amount of time a guest is allowed to execute
|
|
* in a PAUSE loop. Tests indicate that most spinlocks are held for
|
|
* less than 2^12 cycles
|
|
* Time is measured based on a counter that runs at the same rate as the TSC,
|
|
* refer SDM volume 3b section 21.6.13 & 22.1.3.
|
|
*/
|
|
#define KVM_VMX_DEFAULT_PLE_GAP 128
|
|
#define KVM_VMX_DEFAULT_PLE_WINDOW 4096
|
|
static int ple_gap = KVM_VMX_DEFAULT_PLE_GAP;
|
|
module_param(ple_gap, int, S_IRUGO);
|
|
|
|
static int ple_window = KVM_VMX_DEFAULT_PLE_WINDOW;
|
|
module_param(ple_window, int, S_IRUGO);
|
|
|
|
#define NR_AUTOLOAD_MSRS 8
|
|
#define VMCS02_POOL_SIZE 1
|
|
|
|
struct vmcs {
|
|
u32 revision_id;
|
|
u32 abort;
|
|
char data[0];
|
|
};
|
|
|
|
/*
|
|
* Track a VMCS that may be loaded on a certain CPU. If it is (cpu!=-1), also
|
|
* remember whether it was VMLAUNCHed, and maintain a linked list of all VMCSs
|
|
* loaded on this CPU (so we can clear them if the CPU goes down).
|
|
*/
|
|
struct loaded_vmcs {
|
|
struct vmcs *vmcs;
|
|
int cpu;
|
|
int launched;
|
|
struct list_head loaded_vmcss_on_cpu_link;
|
|
};
|
|
|
|
struct shared_msr_entry {
|
|
unsigned index;
|
|
u64 data;
|
|
u64 mask;
|
|
};
|
|
|
|
/*
|
|
* struct vmcs12 describes the state that our guest hypervisor (L1) keeps for a
|
|
* single nested guest (L2), hence the name vmcs12. Any VMX implementation has
|
|
* a VMCS structure, and vmcs12 is our emulated VMX's VMCS. This structure is
|
|
* stored in guest memory specified by VMPTRLD, but is opaque to the guest,
|
|
* which must access it using VMREAD/VMWRITE/VMCLEAR instructions.
|
|
* More than one of these structures may exist, if L1 runs multiple L2 guests.
|
|
* nested_vmx_run() will use the data here to build a vmcs02: a VMCS for the
|
|
* underlying hardware which will be used to run L2.
|
|
* This structure is packed to ensure that its layout is identical across
|
|
* machines (necessary for live migration).
|
|
* If there are changes in this struct, VMCS12_REVISION must be changed.
|
|
*/
|
|
typedef u64 natural_width;
|
|
struct __packed vmcs12 {
|
|
/* According to the Intel spec, a VMCS region must start with the
|
|
* following two fields. Then follow implementation-specific data.
|
|
*/
|
|
u32 revision_id;
|
|
u32 abort;
|
|
|
|
u32 launch_state; /* set to 0 by VMCLEAR, to 1 by VMLAUNCH */
|
|
u32 padding[7]; /* room for future expansion */
|
|
|
|
u64 io_bitmap_a;
|
|
u64 io_bitmap_b;
|
|
u64 msr_bitmap;
|
|
u64 vm_exit_msr_store_addr;
|
|
u64 vm_exit_msr_load_addr;
|
|
u64 vm_entry_msr_load_addr;
|
|
u64 tsc_offset;
|
|
u64 virtual_apic_page_addr;
|
|
u64 apic_access_addr;
|
|
u64 ept_pointer;
|
|
u64 guest_physical_address;
|
|
u64 vmcs_link_pointer;
|
|
u64 guest_ia32_debugctl;
|
|
u64 guest_ia32_pat;
|
|
u64 guest_ia32_efer;
|
|
u64 guest_ia32_perf_global_ctrl;
|
|
u64 guest_pdptr0;
|
|
u64 guest_pdptr1;
|
|
u64 guest_pdptr2;
|
|
u64 guest_pdptr3;
|
|
u64 host_ia32_pat;
|
|
u64 host_ia32_efer;
|
|
u64 host_ia32_perf_global_ctrl;
|
|
u64 padding64[8]; /* room for future expansion */
|
|
/*
|
|
* To allow migration of L1 (complete with its L2 guests) between
|
|
* machines of different natural widths (32 or 64 bit), we cannot have
|
|
* unsigned long fields with no explict size. We use u64 (aliased
|
|
* natural_width) instead. Luckily, x86 is little-endian.
|
|
*/
|
|
natural_width cr0_guest_host_mask;
|
|
natural_width cr4_guest_host_mask;
|
|
natural_width cr0_read_shadow;
|
|
natural_width cr4_read_shadow;
|
|
natural_width cr3_target_value0;
|
|
natural_width cr3_target_value1;
|
|
natural_width cr3_target_value2;
|
|
natural_width cr3_target_value3;
|
|
natural_width exit_qualification;
|
|
natural_width guest_linear_address;
|
|
natural_width guest_cr0;
|
|
natural_width guest_cr3;
|
|
natural_width guest_cr4;
|
|
natural_width guest_es_base;
|
|
natural_width guest_cs_base;
|
|
natural_width guest_ss_base;
|
|
natural_width guest_ds_base;
|
|
natural_width guest_fs_base;
|
|
natural_width guest_gs_base;
|
|
natural_width guest_ldtr_base;
|
|
natural_width guest_tr_base;
|
|
natural_width guest_gdtr_base;
|
|
natural_width guest_idtr_base;
|
|
natural_width guest_dr7;
|
|
natural_width guest_rsp;
|
|
natural_width guest_rip;
|
|
natural_width guest_rflags;
|
|
natural_width guest_pending_dbg_exceptions;
|
|
natural_width guest_sysenter_esp;
|
|
natural_width guest_sysenter_eip;
|
|
natural_width host_cr0;
|
|
natural_width host_cr3;
|
|
natural_width host_cr4;
|
|
natural_width host_fs_base;
|
|
natural_width host_gs_base;
|
|
natural_width host_tr_base;
|
|
natural_width host_gdtr_base;
|
|
natural_width host_idtr_base;
|
|
natural_width host_ia32_sysenter_esp;
|
|
natural_width host_ia32_sysenter_eip;
|
|
natural_width host_rsp;
|
|
natural_width host_rip;
|
|
natural_width paddingl[8]; /* room for future expansion */
|
|
u32 pin_based_vm_exec_control;
|
|
u32 cpu_based_vm_exec_control;
|
|
u32 exception_bitmap;
|
|
u32 page_fault_error_code_mask;
|
|
u32 page_fault_error_code_match;
|
|
u32 cr3_target_count;
|
|
u32 vm_exit_controls;
|
|
u32 vm_exit_msr_store_count;
|
|
u32 vm_exit_msr_load_count;
|
|
u32 vm_entry_controls;
|
|
u32 vm_entry_msr_load_count;
|
|
u32 vm_entry_intr_info_field;
|
|
u32 vm_entry_exception_error_code;
|
|
u32 vm_entry_instruction_len;
|
|
u32 tpr_threshold;
|
|
u32 secondary_vm_exec_control;
|
|
u32 vm_instruction_error;
|
|
u32 vm_exit_reason;
|
|
u32 vm_exit_intr_info;
|
|
u32 vm_exit_intr_error_code;
|
|
u32 idt_vectoring_info_field;
|
|
u32 idt_vectoring_error_code;
|
|
u32 vm_exit_instruction_len;
|
|
u32 vmx_instruction_info;
|
|
u32 guest_es_limit;
|
|
u32 guest_cs_limit;
|
|
u32 guest_ss_limit;
|
|
u32 guest_ds_limit;
|
|
u32 guest_fs_limit;
|
|
u32 guest_gs_limit;
|
|
u32 guest_ldtr_limit;
|
|
u32 guest_tr_limit;
|
|
u32 guest_gdtr_limit;
|
|
u32 guest_idtr_limit;
|
|
u32 guest_es_ar_bytes;
|
|
u32 guest_cs_ar_bytes;
|
|
u32 guest_ss_ar_bytes;
|
|
u32 guest_ds_ar_bytes;
|
|
u32 guest_fs_ar_bytes;
|
|
u32 guest_gs_ar_bytes;
|
|
u32 guest_ldtr_ar_bytes;
|
|
u32 guest_tr_ar_bytes;
|
|
u32 guest_interruptibility_info;
|
|
u32 guest_activity_state;
|
|
u32 guest_sysenter_cs;
|
|
u32 host_ia32_sysenter_cs;
|
|
u32 padding32[8]; /* room for future expansion */
|
|
u16 virtual_processor_id;
|
|
u16 guest_es_selector;
|
|
u16 guest_cs_selector;
|
|
u16 guest_ss_selector;
|
|
u16 guest_ds_selector;
|
|
u16 guest_fs_selector;
|
|
u16 guest_gs_selector;
|
|
u16 guest_ldtr_selector;
|
|
u16 guest_tr_selector;
|
|
u16 host_es_selector;
|
|
u16 host_cs_selector;
|
|
u16 host_ss_selector;
|
|
u16 host_ds_selector;
|
|
u16 host_fs_selector;
|
|
u16 host_gs_selector;
|
|
u16 host_tr_selector;
|
|
};
|
|
|
|
/*
|
|
* VMCS12_REVISION is an arbitrary id that should be changed if the content or
|
|
* layout of struct vmcs12 is changed. MSR_IA32_VMX_BASIC returns this id, and
|
|
* VMPTRLD verifies that the VMCS region that L1 is loading contains this id.
|
|
*/
|
|
#define VMCS12_REVISION 0x11e57ed0
|
|
|
|
/*
|
|
* VMCS12_SIZE is the number of bytes L1 should allocate for the VMXON region
|
|
* and any VMCS region. Although only sizeof(struct vmcs12) are used by the
|
|
* current implementation, 4K are reserved to avoid future complications.
|
|
*/
|
|
#define VMCS12_SIZE 0x1000
|
|
|
|
/* Used to remember the last vmcs02 used for some recently used vmcs12s */
|
|
struct vmcs02_list {
|
|
struct list_head list;
|
|
gpa_t vmptr;
|
|
struct loaded_vmcs vmcs02;
|
|
};
|
|
|
|
/*
|
|
* The nested_vmx structure is part of vcpu_vmx, and holds information we need
|
|
* for correct emulation of VMX (i.e., nested VMX) on this vcpu.
|
|
*/
|
|
struct nested_vmx {
|
|
/* Has the level1 guest done vmxon? */
|
|
bool vmxon;
|
|
|
|
/* The guest-physical address of the current VMCS L1 keeps for L2 */
|
|
gpa_t current_vmptr;
|
|
/* The host-usable pointer to the above */
|
|
struct page *current_vmcs12_page;
|
|
struct vmcs12 *current_vmcs12;
|
|
|
|
/* vmcs02_list cache of VMCSs recently used to run L2 guests */
|
|
struct list_head vmcs02_pool;
|
|
int vmcs02_num;
|
|
u64 vmcs01_tsc_offset;
|
|
/* L2 must run next, and mustn't decide to exit to L1. */
|
|
bool nested_run_pending;
|
|
/*
|
|
* Guest pages referred to in vmcs02 with host-physical pointers, so
|
|
* we must keep them pinned while L2 runs.
|
|
*/
|
|
struct page *apic_access_page;
|
|
};
|
|
|
|
struct vcpu_vmx {
|
|
struct kvm_vcpu vcpu;
|
|
unsigned long host_rsp;
|
|
u8 fail;
|
|
u8 cpl;
|
|
bool nmi_known_unmasked;
|
|
u32 exit_intr_info;
|
|
u32 idt_vectoring_info;
|
|
ulong rflags;
|
|
struct shared_msr_entry *guest_msrs;
|
|
int nmsrs;
|
|
int save_nmsrs;
|
|
#ifdef CONFIG_X86_64
|
|
u64 msr_host_kernel_gs_base;
|
|
u64 msr_guest_kernel_gs_base;
|
|
#endif
|
|
/*
|
|
* loaded_vmcs points to the VMCS currently used in this vcpu. For a
|
|
* non-nested (L1) guest, it always points to vmcs01. For a nested
|
|
* guest (L2), it points to a different VMCS.
|
|
*/
|
|
struct loaded_vmcs vmcs01;
|
|
struct loaded_vmcs *loaded_vmcs;
|
|
bool __launched; /* temporary, used in vmx_vcpu_run */
|
|
struct msr_autoload {
|
|
unsigned nr;
|
|
struct vmx_msr_entry guest[NR_AUTOLOAD_MSRS];
|
|
struct vmx_msr_entry host[NR_AUTOLOAD_MSRS];
|
|
} msr_autoload;
|
|
struct {
|
|
int loaded;
|
|
u16 fs_sel, gs_sel, ldt_sel;
|
|
int gs_ldt_reload_needed;
|
|
int fs_reload_needed;
|
|
} host_state;
|
|
struct {
|
|
int vm86_active;
|
|
ulong save_rflags;
|
|
struct kvm_save_segment {
|
|
u16 selector;
|
|
unsigned long base;
|
|
u32 limit;
|
|
u32 ar;
|
|
} tr, es, ds, fs, gs;
|
|
} rmode;
|
|
struct {
|
|
u32 bitmask; /* 4 bits per segment (1 bit per field) */
|
|
struct kvm_save_segment seg[8];
|
|
} segment_cache;
|
|
int vpid;
|
|
bool emulation_required;
|
|
|
|
/* Support for vnmi-less CPUs */
|
|
int soft_vnmi_blocked;
|
|
ktime_t entry_time;
|
|
s64 vnmi_blocked_time;
|
|
u32 exit_reason;
|
|
|
|
bool rdtscp_enabled;
|
|
|
|
/* Support for a guest hypervisor (nested VMX) */
|
|
struct nested_vmx nested;
|
|
};
|
|
|
|
enum segment_cache_field {
|
|
SEG_FIELD_SEL = 0,
|
|
SEG_FIELD_BASE = 1,
|
|
SEG_FIELD_LIMIT = 2,
|
|
SEG_FIELD_AR = 3,
|
|
|
|
SEG_FIELD_NR = 4
|
|
};
|
|
|
|
static inline struct vcpu_vmx *to_vmx(struct kvm_vcpu *vcpu)
|
|
{
|
|
return container_of(vcpu, struct vcpu_vmx, vcpu);
|
|
}
|
|
|
|
#define VMCS12_OFFSET(x) offsetof(struct vmcs12, x)
|
|
#define FIELD(number, name) [number] = VMCS12_OFFSET(name)
|
|
#define FIELD64(number, name) [number] = VMCS12_OFFSET(name), \
|
|
[number##_HIGH] = VMCS12_OFFSET(name)+4
|
|
|
|
static unsigned short vmcs_field_to_offset_table[] = {
|
|
FIELD(VIRTUAL_PROCESSOR_ID, virtual_processor_id),
|
|
FIELD(GUEST_ES_SELECTOR, guest_es_selector),
|
|
FIELD(GUEST_CS_SELECTOR, guest_cs_selector),
|
|
FIELD(GUEST_SS_SELECTOR, guest_ss_selector),
|
|
FIELD(GUEST_DS_SELECTOR, guest_ds_selector),
|
|
FIELD(GUEST_FS_SELECTOR, guest_fs_selector),
|
|
FIELD(GUEST_GS_SELECTOR, guest_gs_selector),
|
|
FIELD(GUEST_LDTR_SELECTOR, guest_ldtr_selector),
|
|
FIELD(GUEST_TR_SELECTOR, guest_tr_selector),
|
|
FIELD(HOST_ES_SELECTOR, host_es_selector),
|
|
FIELD(HOST_CS_SELECTOR, host_cs_selector),
|
|
FIELD(HOST_SS_SELECTOR, host_ss_selector),
|
|
FIELD(HOST_DS_SELECTOR, host_ds_selector),
|
|
FIELD(HOST_FS_SELECTOR, host_fs_selector),
|
|
FIELD(HOST_GS_SELECTOR, host_gs_selector),
|
|
FIELD(HOST_TR_SELECTOR, host_tr_selector),
|
|
FIELD64(IO_BITMAP_A, io_bitmap_a),
|
|
FIELD64(IO_BITMAP_B, io_bitmap_b),
|
|
FIELD64(MSR_BITMAP, msr_bitmap),
|
|
FIELD64(VM_EXIT_MSR_STORE_ADDR, vm_exit_msr_store_addr),
|
|
FIELD64(VM_EXIT_MSR_LOAD_ADDR, vm_exit_msr_load_addr),
|
|
FIELD64(VM_ENTRY_MSR_LOAD_ADDR, vm_entry_msr_load_addr),
|
|
FIELD64(TSC_OFFSET, tsc_offset),
|
|
FIELD64(VIRTUAL_APIC_PAGE_ADDR, virtual_apic_page_addr),
|
|
FIELD64(APIC_ACCESS_ADDR, apic_access_addr),
|
|
FIELD64(EPT_POINTER, ept_pointer),
|
|
FIELD64(GUEST_PHYSICAL_ADDRESS, guest_physical_address),
|
|
FIELD64(VMCS_LINK_POINTER, vmcs_link_pointer),
|
|
FIELD64(GUEST_IA32_DEBUGCTL, guest_ia32_debugctl),
|
|
FIELD64(GUEST_IA32_PAT, guest_ia32_pat),
|
|
FIELD64(GUEST_IA32_EFER, guest_ia32_efer),
|
|
FIELD64(GUEST_IA32_PERF_GLOBAL_CTRL, guest_ia32_perf_global_ctrl),
|
|
FIELD64(GUEST_PDPTR0, guest_pdptr0),
|
|
FIELD64(GUEST_PDPTR1, guest_pdptr1),
|
|
FIELD64(GUEST_PDPTR2, guest_pdptr2),
|
|
FIELD64(GUEST_PDPTR3, guest_pdptr3),
|
|
FIELD64(HOST_IA32_PAT, host_ia32_pat),
|
|
FIELD64(HOST_IA32_EFER, host_ia32_efer),
|
|
FIELD64(HOST_IA32_PERF_GLOBAL_CTRL, host_ia32_perf_global_ctrl),
|
|
FIELD(PIN_BASED_VM_EXEC_CONTROL, pin_based_vm_exec_control),
|
|
FIELD(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control),
|
|
FIELD(EXCEPTION_BITMAP, exception_bitmap),
|
|
FIELD(PAGE_FAULT_ERROR_CODE_MASK, page_fault_error_code_mask),
|
|
FIELD(PAGE_FAULT_ERROR_CODE_MATCH, page_fault_error_code_match),
|
|
FIELD(CR3_TARGET_COUNT, cr3_target_count),
|
|
FIELD(VM_EXIT_CONTROLS, vm_exit_controls),
|
|
FIELD(VM_EXIT_MSR_STORE_COUNT, vm_exit_msr_store_count),
|
|
FIELD(VM_EXIT_MSR_LOAD_COUNT, vm_exit_msr_load_count),
|
|
FIELD(VM_ENTRY_CONTROLS, vm_entry_controls),
|
|
FIELD(VM_ENTRY_MSR_LOAD_COUNT, vm_entry_msr_load_count),
|
|
FIELD(VM_ENTRY_INTR_INFO_FIELD, vm_entry_intr_info_field),
|
|
FIELD(VM_ENTRY_EXCEPTION_ERROR_CODE, vm_entry_exception_error_code),
|
|
FIELD(VM_ENTRY_INSTRUCTION_LEN, vm_entry_instruction_len),
|
|
FIELD(TPR_THRESHOLD, tpr_threshold),
|
|
FIELD(SECONDARY_VM_EXEC_CONTROL, secondary_vm_exec_control),
|
|
FIELD(VM_INSTRUCTION_ERROR, vm_instruction_error),
|
|
FIELD(VM_EXIT_REASON, vm_exit_reason),
|
|
FIELD(VM_EXIT_INTR_INFO, vm_exit_intr_info),
|
|
FIELD(VM_EXIT_INTR_ERROR_CODE, vm_exit_intr_error_code),
|
|
FIELD(IDT_VECTORING_INFO_FIELD, idt_vectoring_info_field),
|
|
FIELD(IDT_VECTORING_ERROR_CODE, idt_vectoring_error_code),
|
|
FIELD(VM_EXIT_INSTRUCTION_LEN, vm_exit_instruction_len),
|
|
FIELD(VMX_INSTRUCTION_INFO, vmx_instruction_info),
|
|
FIELD(GUEST_ES_LIMIT, guest_es_limit),
|
|
FIELD(GUEST_CS_LIMIT, guest_cs_limit),
|
|
FIELD(GUEST_SS_LIMIT, guest_ss_limit),
|
|
FIELD(GUEST_DS_LIMIT, guest_ds_limit),
|
|
FIELD(GUEST_FS_LIMIT, guest_fs_limit),
|
|
FIELD(GUEST_GS_LIMIT, guest_gs_limit),
|
|
FIELD(GUEST_LDTR_LIMIT, guest_ldtr_limit),
|
|
FIELD(GUEST_TR_LIMIT, guest_tr_limit),
|
|
FIELD(GUEST_GDTR_LIMIT, guest_gdtr_limit),
|
|
FIELD(GUEST_IDTR_LIMIT, guest_idtr_limit),
|
|
FIELD(GUEST_ES_AR_BYTES, guest_es_ar_bytes),
|
|
FIELD(GUEST_CS_AR_BYTES, guest_cs_ar_bytes),
|
|
FIELD(GUEST_SS_AR_BYTES, guest_ss_ar_bytes),
|
|
FIELD(GUEST_DS_AR_BYTES, guest_ds_ar_bytes),
|
|
FIELD(GUEST_FS_AR_BYTES, guest_fs_ar_bytes),
|
|
FIELD(GUEST_GS_AR_BYTES, guest_gs_ar_bytes),
|
|
FIELD(GUEST_LDTR_AR_BYTES, guest_ldtr_ar_bytes),
|
|
FIELD(GUEST_TR_AR_BYTES, guest_tr_ar_bytes),
|
|
FIELD(GUEST_INTERRUPTIBILITY_INFO, guest_interruptibility_info),
|
|
FIELD(GUEST_ACTIVITY_STATE, guest_activity_state),
|
|
FIELD(GUEST_SYSENTER_CS, guest_sysenter_cs),
|
|
FIELD(HOST_IA32_SYSENTER_CS, host_ia32_sysenter_cs),
|
|
FIELD(CR0_GUEST_HOST_MASK, cr0_guest_host_mask),
|
|
FIELD(CR4_GUEST_HOST_MASK, cr4_guest_host_mask),
|
|
FIELD(CR0_READ_SHADOW, cr0_read_shadow),
|
|
FIELD(CR4_READ_SHADOW, cr4_read_shadow),
|
|
FIELD(CR3_TARGET_VALUE0, cr3_target_value0),
|
|
FIELD(CR3_TARGET_VALUE1, cr3_target_value1),
|
|
FIELD(CR3_TARGET_VALUE2, cr3_target_value2),
|
|
FIELD(CR3_TARGET_VALUE3, cr3_target_value3),
|
|
FIELD(EXIT_QUALIFICATION, exit_qualification),
|
|
FIELD(GUEST_LINEAR_ADDRESS, guest_linear_address),
|
|
FIELD(GUEST_CR0, guest_cr0),
|
|
FIELD(GUEST_CR3, guest_cr3),
|
|
FIELD(GUEST_CR4, guest_cr4),
|
|
FIELD(GUEST_ES_BASE, guest_es_base),
|
|
FIELD(GUEST_CS_BASE, guest_cs_base),
|
|
FIELD(GUEST_SS_BASE, guest_ss_base),
|
|
FIELD(GUEST_DS_BASE, guest_ds_base),
|
|
FIELD(GUEST_FS_BASE, guest_fs_base),
|
|
FIELD(GUEST_GS_BASE, guest_gs_base),
|
|
FIELD(GUEST_LDTR_BASE, guest_ldtr_base),
|
|
FIELD(GUEST_TR_BASE, guest_tr_base),
|
|
FIELD(GUEST_GDTR_BASE, guest_gdtr_base),
|
|
FIELD(GUEST_IDTR_BASE, guest_idtr_base),
|
|
FIELD(GUEST_DR7, guest_dr7),
|
|
FIELD(GUEST_RSP, guest_rsp),
|
|
FIELD(GUEST_RIP, guest_rip),
|
|
FIELD(GUEST_RFLAGS, guest_rflags),
|
|
FIELD(GUEST_PENDING_DBG_EXCEPTIONS, guest_pending_dbg_exceptions),
|
|
FIELD(GUEST_SYSENTER_ESP, guest_sysenter_esp),
|
|
FIELD(GUEST_SYSENTER_EIP, guest_sysenter_eip),
|
|
FIELD(HOST_CR0, host_cr0),
|
|
FIELD(HOST_CR3, host_cr3),
|
|
FIELD(HOST_CR4, host_cr4),
|
|
FIELD(HOST_FS_BASE, host_fs_base),
|
|
FIELD(HOST_GS_BASE, host_gs_base),
|
|
FIELD(HOST_TR_BASE, host_tr_base),
|
|
FIELD(HOST_GDTR_BASE, host_gdtr_base),
|
|
FIELD(HOST_IDTR_BASE, host_idtr_base),
|
|
FIELD(HOST_IA32_SYSENTER_ESP, host_ia32_sysenter_esp),
|
|
FIELD(HOST_IA32_SYSENTER_EIP, host_ia32_sysenter_eip),
|
|
FIELD(HOST_RSP, host_rsp),
|
|
FIELD(HOST_RIP, host_rip),
|
|
};
|
|
static const int max_vmcs_field = ARRAY_SIZE(vmcs_field_to_offset_table);
|
|
|
|
static inline short vmcs_field_to_offset(unsigned long field)
|
|
{
|
|
if (field >= max_vmcs_field || vmcs_field_to_offset_table[field] == 0)
|
|
return -1;
|
|
return vmcs_field_to_offset_table[field];
|
|
}
|
|
|
|
static inline struct vmcs12 *get_vmcs12(struct kvm_vcpu *vcpu)
|
|
{
|
|
return to_vmx(vcpu)->nested.current_vmcs12;
|
|
}
|
|
|
|
static struct page *nested_get_page(struct kvm_vcpu *vcpu, gpa_t addr)
|
|
{
|
|
struct page *page = gfn_to_page(vcpu->kvm, addr >> PAGE_SHIFT);
|
|
if (is_error_page(page)) {
|
|
kvm_release_page_clean(page);
|
|
return NULL;
|
|
}
|
|
return page;
|
|
}
|
|
|
|
static void nested_release_page(struct page *page)
|
|
{
|
|
kvm_release_page_dirty(page);
|
|
}
|
|
|
|
static void nested_release_page_clean(struct page *page)
|
|
{
|
|
kvm_release_page_clean(page);
|
|
}
|
|
|
|
static u64 construct_eptp(unsigned long root_hpa);
|
|
static void kvm_cpu_vmxon(u64 addr);
|
|
static void kvm_cpu_vmxoff(void);
|
|
static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3);
|
|
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr);
|
|
|
|
static DEFINE_PER_CPU(struct vmcs *, vmxarea);
|
|
static DEFINE_PER_CPU(struct vmcs *, current_vmcs);
|
|
/*
|
|
* We maintain a per-CPU linked-list of VMCS loaded on that CPU. This is needed
|
|
* when a CPU is brought down, and we need to VMCLEAR all VMCSs loaded on it.
|
|
*/
|
|
static DEFINE_PER_CPU(struct list_head, loaded_vmcss_on_cpu);
|
|
static DEFINE_PER_CPU(struct desc_ptr, host_gdt);
|
|
|
|
static unsigned long *vmx_io_bitmap_a;
|
|
static unsigned long *vmx_io_bitmap_b;
|
|
static unsigned long *vmx_msr_bitmap_legacy;
|
|
static unsigned long *vmx_msr_bitmap_longmode;
|
|
|
|
static bool cpu_has_load_ia32_efer;
|
|
static bool cpu_has_load_perf_global_ctrl;
|
|
|
|
static DECLARE_BITMAP(vmx_vpid_bitmap, VMX_NR_VPIDS);
|
|
static DEFINE_SPINLOCK(vmx_vpid_lock);
|
|
|
|
static struct vmcs_config {
|
|
int size;
|
|
int order;
|
|
u32 revision_id;
|
|
u32 pin_based_exec_ctrl;
|
|
u32 cpu_based_exec_ctrl;
|
|
u32 cpu_based_2nd_exec_ctrl;
|
|
u32 vmexit_ctrl;
|
|
u32 vmentry_ctrl;
|
|
} vmcs_config;
|
|
|
|
static struct vmx_capability {
|
|
u32 ept;
|
|
u32 vpid;
|
|
} vmx_capability;
|
|
|
|
#define VMX_SEGMENT_FIELD(seg) \
|
|
[VCPU_SREG_##seg] = { \
|
|
.selector = GUEST_##seg##_SELECTOR, \
|
|
.base = GUEST_##seg##_BASE, \
|
|
.limit = GUEST_##seg##_LIMIT, \
|
|
.ar_bytes = GUEST_##seg##_AR_BYTES, \
|
|
}
|
|
|
|
static struct kvm_vmx_segment_field {
|
|
unsigned selector;
|
|
unsigned base;
|
|
unsigned limit;
|
|
unsigned ar_bytes;
|
|
} kvm_vmx_segment_fields[] = {
|
|
VMX_SEGMENT_FIELD(CS),
|
|
VMX_SEGMENT_FIELD(DS),
|
|
VMX_SEGMENT_FIELD(ES),
|
|
VMX_SEGMENT_FIELD(FS),
|
|
VMX_SEGMENT_FIELD(GS),
|
|
VMX_SEGMENT_FIELD(SS),
|
|
VMX_SEGMENT_FIELD(TR),
|
|
VMX_SEGMENT_FIELD(LDTR),
|
|
};
|
|
|
|
static u64 host_efer;
|
|
|
|
static void ept_save_pdptrs(struct kvm_vcpu *vcpu);
|
|
|
|
/*
|
|
* Keep MSR_STAR at the end, as setup_msrs() will try to optimize it
|
|
* away by decrementing the array size.
|
|
*/
|
|
static const u32 vmx_msr_index[] = {
|
|
#ifdef CONFIG_X86_64
|
|
MSR_SYSCALL_MASK, MSR_LSTAR, MSR_CSTAR,
|
|
#endif
|
|
MSR_EFER, MSR_TSC_AUX, MSR_STAR,
|
|
};
|
|
#define NR_VMX_MSR ARRAY_SIZE(vmx_msr_index)
|
|
|
|
static inline bool is_page_fault(u32 intr_info)
|
|
{
|
|
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
|
|
INTR_INFO_VALID_MASK)) ==
|
|
(INTR_TYPE_HARD_EXCEPTION | PF_VECTOR | INTR_INFO_VALID_MASK);
|
|
}
|
|
|
|
static inline bool is_no_device(u32 intr_info)
|
|
{
|
|
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
|
|
INTR_INFO_VALID_MASK)) ==
|
|
(INTR_TYPE_HARD_EXCEPTION | NM_VECTOR | INTR_INFO_VALID_MASK);
|
|
}
|
|
|
|
static inline bool is_invalid_opcode(u32 intr_info)
|
|
{
|
|
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
|
|
INTR_INFO_VALID_MASK)) ==
|
|
(INTR_TYPE_HARD_EXCEPTION | UD_VECTOR | INTR_INFO_VALID_MASK);
|
|
}
|
|
|
|
static inline bool is_external_interrupt(u32 intr_info)
|
|
{
|
|
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
|
|
== (INTR_TYPE_EXT_INTR | INTR_INFO_VALID_MASK);
|
|
}
|
|
|
|
static inline bool is_machine_check(u32 intr_info)
|
|
{
|
|
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VECTOR_MASK |
|
|
INTR_INFO_VALID_MASK)) ==
|
|
(INTR_TYPE_HARD_EXCEPTION | MC_VECTOR | INTR_INFO_VALID_MASK);
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_msr_bitmap(void)
|
|
{
|
|
return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_USE_MSR_BITMAPS;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_tpr_shadow(void)
|
|
{
|
|
return vmcs_config.cpu_based_exec_ctrl & CPU_BASED_TPR_SHADOW;
|
|
}
|
|
|
|
static inline bool vm_need_tpr_shadow(struct kvm *kvm)
|
|
{
|
|
return (cpu_has_vmx_tpr_shadow()) && (irqchip_in_kernel(kvm));
|
|
}
|
|
|
|
static inline bool cpu_has_secondary_exec_ctrls(void)
|
|
{
|
|
return vmcs_config.cpu_based_exec_ctrl &
|
|
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_virtualize_apic_accesses(void)
|
|
{
|
|
return vmcs_config.cpu_based_2nd_exec_ctrl &
|
|
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_flexpriority(void)
|
|
{
|
|
return cpu_has_vmx_tpr_shadow() &&
|
|
cpu_has_vmx_virtualize_apic_accesses();
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_ept_execute_only(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPT_EXECUTE_ONLY_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_eptp_uncacheable(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPTP_UC_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_eptp_writeback(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPTP_WB_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_ept_2m_page(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPT_2MB_PAGE_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_ept_1g_page(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPT_1GB_PAGE_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_ept_4levels(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPT_PAGE_WALK_4_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_invept_individual_addr(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPT_EXTENT_INDIVIDUAL_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_invept_context(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPT_EXTENT_CONTEXT_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_invept_global(void)
|
|
{
|
|
return vmx_capability.ept & VMX_EPT_EXTENT_GLOBAL_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_invvpid_single(void)
|
|
{
|
|
return vmx_capability.vpid & VMX_VPID_EXTENT_SINGLE_CONTEXT_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_invvpid_global(void)
|
|
{
|
|
return vmx_capability.vpid & VMX_VPID_EXTENT_GLOBAL_CONTEXT_BIT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_ept(void)
|
|
{
|
|
return vmcs_config.cpu_based_2nd_exec_ctrl &
|
|
SECONDARY_EXEC_ENABLE_EPT;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_unrestricted_guest(void)
|
|
{
|
|
return vmcs_config.cpu_based_2nd_exec_ctrl &
|
|
SECONDARY_EXEC_UNRESTRICTED_GUEST;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_ple(void)
|
|
{
|
|
return vmcs_config.cpu_based_2nd_exec_ctrl &
|
|
SECONDARY_EXEC_PAUSE_LOOP_EXITING;
|
|
}
|
|
|
|
static inline bool vm_need_virtualize_apic_accesses(struct kvm *kvm)
|
|
{
|
|
return flexpriority_enabled && irqchip_in_kernel(kvm);
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_vpid(void)
|
|
{
|
|
return vmcs_config.cpu_based_2nd_exec_ctrl &
|
|
SECONDARY_EXEC_ENABLE_VPID;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_rdtscp(void)
|
|
{
|
|
return vmcs_config.cpu_based_2nd_exec_ctrl &
|
|
SECONDARY_EXEC_RDTSCP;
|
|
}
|
|
|
|
static inline bool cpu_has_virtual_nmis(void)
|
|
{
|
|
return vmcs_config.pin_based_exec_ctrl & PIN_BASED_VIRTUAL_NMIS;
|
|
}
|
|
|
|
static inline bool cpu_has_vmx_wbinvd_exit(void)
|
|
{
|
|
return vmcs_config.cpu_based_2nd_exec_ctrl &
|
|
SECONDARY_EXEC_WBINVD_EXITING;
|
|
}
|
|
|
|
static inline bool report_flexpriority(void)
|
|
{
|
|
return flexpriority_enabled;
|
|
}
|
|
|
|
static inline bool nested_cpu_has(struct vmcs12 *vmcs12, u32 bit)
|
|
{
|
|
return vmcs12->cpu_based_vm_exec_control & bit;
|
|
}
|
|
|
|
static inline bool nested_cpu_has2(struct vmcs12 *vmcs12, u32 bit)
|
|
{
|
|
return (vmcs12->cpu_based_vm_exec_control &
|
|
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) &&
|
|
(vmcs12->secondary_vm_exec_control & bit);
|
|
}
|
|
|
|
static inline bool nested_cpu_has_virtual_nmis(struct vmcs12 *vmcs12,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
return vmcs12->pin_based_vm_exec_control & PIN_BASED_VIRTUAL_NMIS;
|
|
}
|
|
|
|
static inline bool is_exception(u32 intr_info)
|
|
{
|
|
return (intr_info & (INTR_INFO_INTR_TYPE_MASK | INTR_INFO_VALID_MASK))
|
|
== (INTR_TYPE_HARD_EXCEPTION | INTR_INFO_VALID_MASK);
|
|
}
|
|
|
|
static void nested_vmx_vmexit(struct kvm_vcpu *vcpu);
|
|
static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu,
|
|
struct vmcs12 *vmcs12,
|
|
u32 reason, unsigned long qualification);
|
|
|
|
static int __find_msr_index(struct vcpu_vmx *vmx, u32 msr)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < vmx->nmsrs; ++i)
|
|
if (vmx_msr_index[vmx->guest_msrs[i].index] == msr)
|
|
return i;
|
|
return -1;
|
|
}
|
|
|
|
static inline void __invvpid(int ext, u16 vpid, gva_t gva)
|
|
{
|
|
struct {
|
|
u64 vpid : 16;
|
|
u64 rsvd : 48;
|
|
u64 gva;
|
|
} operand = { vpid, 0, gva };
|
|
|
|
asm volatile (__ex(ASM_VMX_INVVPID)
|
|
/* CF==1 or ZF==1 --> rc = -1 */
|
|
"; ja 1f ; ud2 ; 1:"
|
|
: : "a"(&operand), "c"(ext) : "cc", "memory");
|
|
}
|
|
|
|
static inline void __invept(int ext, u64 eptp, gpa_t gpa)
|
|
{
|
|
struct {
|
|
u64 eptp, gpa;
|
|
} operand = {eptp, gpa};
|
|
|
|
asm volatile (__ex(ASM_VMX_INVEPT)
|
|
/* CF==1 or ZF==1 --> rc = -1 */
|
|
"; ja 1f ; ud2 ; 1:\n"
|
|
: : "a" (&operand), "c" (ext) : "cc", "memory");
|
|
}
|
|
|
|
static struct shared_msr_entry *find_msr_entry(struct vcpu_vmx *vmx, u32 msr)
|
|
{
|
|
int i;
|
|
|
|
i = __find_msr_index(vmx, msr);
|
|
if (i >= 0)
|
|
return &vmx->guest_msrs[i];
|
|
return NULL;
|
|
}
|
|
|
|
static void vmcs_clear(struct vmcs *vmcs)
|
|
{
|
|
u64 phys_addr = __pa(vmcs);
|
|
u8 error;
|
|
|
|
asm volatile (__ex(ASM_VMX_VMCLEAR_RAX) "; setna %0"
|
|
: "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
|
|
: "cc", "memory");
|
|
if (error)
|
|
printk(KERN_ERR "kvm: vmclear fail: %p/%llx\n",
|
|
vmcs, phys_addr);
|
|
}
|
|
|
|
static inline void loaded_vmcs_init(struct loaded_vmcs *loaded_vmcs)
|
|
{
|
|
vmcs_clear(loaded_vmcs->vmcs);
|
|
loaded_vmcs->cpu = -1;
|
|
loaded_vmcs->launched = 0;
|
|
}
|
|
|
|
static void vmcs_load(struct vmcs *vmcs)
|
|
{
|
|
u64 phys_addr = __pa(vmcs);
|
|
u8 error;
|
|
|
|
asm volatile (__ex(ASM_VMX_VMPTRLD_RAX) "; setna %0"
|
|
: "=qm"(error) : "a"(&phys_addr), "m"(phys_addr)
|
|
: "cc", "memory");
|
|
if (error)
|
|
printk(KERN_ERR "kvm: vmptrld %p/%llx failed\n",
|
|
vmcs, phys_addr);
|
|
}
|
|
|
|
static void __loaded_vmcs_clear(void *arg)
|
|
{
|
|
struct loaded_vmcs *loaded_vmcs = arg;
|
|
int cpu = raw_smp_processor_id();
|
|
|
|
if (loaded_vmcs->cpu != cpu)
|
|
return; /* vcpu migration can race with cpu offline */
|
|
if (per_cpu(current_vmcs, cpu) == loaded_vmcs->vmcs)
|
|
per_cpu(current_vmcs, cpu) = NULL;
|
|
list_del(&loaded_vmcs->loaded_vmcss_on_cpu_link);
|
|
loaded_vmcs_init(loaded_vmcs);
|
|
}
|
|
|
|
static void loaded_vmcs_clear(struct loaded_vmcs *loaded_vmcs)
|
|
{
|
|
if (loaded_vmcs->cpu != -1)
|
|
smp_call_function_single(
|
|
loaded_vmcs->cpu, __loaded_vmcs_clear, loaded_vmcs, 1);
|
|
}
|
|
|
|
static inline void vpid_sync_vcpu_single(struct vcpu_vmx *vmx)
|
|
{
|
|
if (vmx->vpid == 0)
|
|
return;
|
|
|
|
if (cpu_has_vmx_invvpid_single())
|
|
__invvpid(VMX_VPID_EXTENT_SINGLE_CONTEXT, vmx->vpid, 0);
|
|
}
|
|
|
|
static inline void vpid_sync_vcpu_global(void)
|
|
{
|
|
if (cpu_has_vmx_invvpid_global())
|
|
__invvpid(VMX_VPID_EXTENT_ALL_CONTEXT, 0, 0);
|
|
}
|
|
|
|
static inline void vpid_sync_context(struct vcpu_vmx *vmx)
|
|
{
|
|
if (cpu_has_vmx_invvpid_single())
|
|
vpid_sync_vcpu_single(vmx);
|
|
else
|
|
vpid_sync_vcpu_global();
|
|
}
|
|
|
|
static inline void ept_sync_global(void)
|
|
{
|
|
if (cpu_has_vmx_invept_global())
|
|
__invept(VMX_EPT_EXTENT_GLOBAL, 0, 0);
|
|
}
|
|
|
|
static inline void ept_sync_context(u64 eptp)
|
|
{
|
|
if (enable_ept) {
|
|
if (cpu_has_vmx_invept_context())
|
|
__invept(VMX_EPT_EXTENT_CONTEXT, eptp, 0);
|
|
else
|
|
ept_sync_global();
|
|
}
|
|
}
|
|
|
|
static inline void ept_sync_individual_addr(u64 eptp, gpa_t gpa)
|
|
{
|
|
if (enable_ept) {
|
|
if (cpu_has_vmx_invept_individual_addr())
|
|
__invept(VMX_EPT_EXTENT_INDIVIDUAL_ADDR,
|
|
eptp, gpa);
|
|
else
|
|
ept_sync_context(eptp);
|
|
}
|
|
}
|
|
|
|
static __always_inline unsigned long vmcs_readl(unsigned long field)
|
|
{
|
|
unsigned long value;
|
|
|
|
asm volatile (__ex_clear(ASM_VMX_VMREAD_RDX_RAX, "%0")
|
|
: "=a"(value) : "d"(field) : "cc");
|
|
return value;
|
|
}
|
|
|
|
static __always_inline u16 vmcs_read16(unsigned long field)
|
|
{
|
|
return vmcs_readl(field);
|
|
}
|
|
|
|
static __always_inline u32 vmcs_read32(unsigned long field)
|
|
{
|
|
return vmcs_readl(field);
|
|
}
|
|
|
|
static __always_inline u64 vmcs_read64(unsigned long field)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
return vmcs_readl(field);
|
|
#else
|
|
return vmcs_readl(field) | ((u64)vmcs_readl(field+1) << 32);
|
|
#endif
|
|
}
|
|
|
|
static noinline void vmwrite_error(unsigned long field, unsigned long value)
|
|
{
|
|
printk(KERN_ERR "vmwrite error: reg %lx value %lx (err %d)\n",
|
|
field, value, vmcs_read32(VM_INSTRUCTION_ERROR));
|
|
dump_stack();
|
|
}
|
|
|
|
static void vmcs_writel(unsigned long field, unsigned long value)
|
|
{
|
|
u8 error;
|
|
|
|
asm volatile (__ex(ASM_VMX_VMWRITE_RAX_RDX) "; setna %0"
|
|
: "=q"(error) : "a"(value), "d"(field) : "cc");
|
|
if (unlikely(error))
|
|
vmwrite_error(field, value);
|
|
}
|
|
|
|
static void vmcs_write16(unsigned long field, u16 value)
|
|
{
|
|
vmcs_writel(field, value);
|
|
}
|
|
|
|
static void vmcs_write32(unsigned long field, u32 value)
|
|
{
|
|
vmcs_writel(field, value);
|
|
}
|
|
|
|
static void vmcs_write64(unsigned long field, u64 value)
|
|
{
|
|
vmcs_writel(field, value);
|
|
#ifndef CONFIG_X86_64
|
|
asm volatile ("");
|
|
vmcs_writel(field+1, value >> 32);
|
|
#endif
|
|
}
|
|
|
|
static void vmcs_clear_bits(unsigned long field, u32 mask)
|
|
{
|
|
vmcs_writel(field, vmcs_readl(field) & ~mask);
|
|
}
|
|
|
|
static void vmcs_set_bits(unsigned long field, u32 mask)
|
|
{
|
|
vmcs_writel(field, vmcs_readl(field) | mask);
|
|
}
|
|
|
|
static void vmx_segment_cache_clear(struct vcpu_vmx *vmx)
|
|
{
|
|
vmx->segment_cache.bitmask = 0;
|
|
}
|
|
|
|
static bool vmx_segment_cache_test_set(struct vcpu_vmx *vmx, unsigned seg,
|
|
unsigned field)
|
|
{
|
|
bool ret;
|
|
u32 mask = 1 << (seg * SEG_FIELD_NR + field);
|
|
|
|
if (!(vmx->vcpu.arch.regs_avail & (1 << VCPU_EXREG_SEGMENTS))) {
|
|
vmx->vcpu.arch.regs_avail |= (1 << VCPU_EXREG_SEGMENTS);
|
|
vmx->segment_cache.bitmask = 0;
|
|
}
|
|
ret = vmx->segment_cache.bitmask & mask;
|
|
vmx->segment_cache.bitmask |= mask;
|
|
return ret;
|
|
}
|
|
|
|
static u16 vmx_read_guest_seg_selector(struct vcpu_vmx *vmx, unsigned seg)
|
|
{
|
|
u16 *p = &vmx->segment_cache.seg[seg].selector;
|
|
|
|
if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_SEL))
|
|
*p = vmcs_read16(kvm_vmx_segment_fields[seg].selector);
|
|
return *p;
|
|
}
|
|
|
|
static ulong vmx_read_guest_seg_base(struct vcpu_vmx *vmx, unsigned seg)
|
|
{
|
|
ulong *p = &vmx->segment_cache.seg[seg].base;
|
|
|
|
if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_BASE))
|
|
*p = vmcs_readl(kvm_vmx_segment_fields[seg].base);
|
|
return *p;
|
|
}
|
|
|
|
static u32 vmx_read_guest_seg_limit(struct vcpu_vmx *vmx, unsigned seg)
|
|
{
|
|
u32 *p = &vmx->segment_cache.seg[seg].limit;
|
|
|
|
if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_LIMIT))
|
|
*p = vmcs_read32(kvm_vmx_segment_fields[seg].limit);
|
|
return *p;
|
|
}
|
|
|
|
static u32 vmx_read_guest_seg_ar(struct vcpu_vmx *vmx, unsigned seg)
|
|
{
|
|
u32 *p = &vmx->segment_cache.seg[seg].ar;
|
|
|
|
if (!vmx_segment_cache_test_set(vmx, seg, SEG_FIELD_AR))
|
|
*p = vmcs_read32(kvm_vmx_segment_fields[seg].ar_bytes);
|
|
return *p;
|
|
}
|
|
|
|
static void update_exception_bitmap(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 eb;
|
|
|
|
eb = (1u << PF_VECTOR) | (1u << UD_VECTOR) | (1u << MC_VECTOR) |
|
|
(1u << NM_VECTOR) | (1u << DB_VECTOR);
|
|
if ((vcpu->guest_debug &
|
|
(KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP)) ==
|
|
(KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP))
|
|
eb |= 1u << BP_VECTOR;
|
|
if (to_vmx(vcpu)->rmode.vm86_active)
|
|
eb = ~0;
|
|
if (enable_ept)
|
|
eb &= ~(1u << PF_VECTOR); /* bypass_guest_pf = 0 */
|
|
if (vcpu->fpu_active)
|
|
eb &= ~(1u << NM_VECTOR);
|
|
|
|
/* When we are running a nested L2 guest and L1 specified for it a
|
|
* certain exception bitmap, we must trap the same exceptions and pass
|
|
* them to L1. When running L2, we will only handle the exceptions
|
|
* specified above if L1 did not want them.
|
|
*/
|
|
if (is_guest_mode(vcpu))
|
|
eb |= get_vmcs12(vcpu)->exception_bitmap;
|
|
|
|
vmcs_write32(EXCEPTION_BITMAP, eb);
|
|
}
|
|
|
|
static void clear_atomic_switch_msr_special(unsigned long entry,
|
|
unsigned long exit)
|
|
{
|
|
vmcs_clear_bits(VM_ENTRY_CONTROLS, entry);
|
|
vmcs_clear_bits(VM_EXIT_CONTROLS, exit);
|
|
}
|
|
|
|
static void clear_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr)
|
|
{
|
|
unsigned i;
|
|
struct msr_autoload *m = &vmx->msr_autoload;
|
|
|
|
switch (msr) {
|
|
case MSR_EFER:
|
|
if (cpu_has_load_ia32_efer) {
|
|
clear_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER,
|
|
VM_EXIT_LOAD_IA32_EFER);
|
|
return;
|
|
}
|
|
break;
|
|
case MSR_CORE_PERF_GLOBAL_CTRL:
|
|
if (cpu_has_load_perf_global_ctrl) {
|
|
clear_atomic_switch_msr_special(
|
|
VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
|
|
VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL);
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < m->nr; ++i)
|
|
if (m->guest[i].index == msr)
|
|
break;
|
|
|
|
if (i == m->nr)
|
|
return;
|
|
--m->nr;
|
|
m->guest[i] = m->guest[m->nr];
|
|
m->host[i] = m->host[m->nr];
|
|
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
|
|
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
|
|
}
|
|
|
|
static void add_atomic_switch_msr_special(unsigned long entry,
|
|
unsigned long exit, unsigned long guest_val_vmcs,
|
|
unsigned long host_val_vmcs, u64 guest_val, u64 host_val)
|
|
{
|
|
vmcs_write64(guest_val_vmcs, guest_val);
|
|
vmcs_write64(host_val_vmcs, host_val);
|
|
vmcs_set_bits(VM_ENTRY_CONTROLS, entry);
|
|
vmcs_set_bits(VM_EXIT_CONTROLS, exit);
|
|
}
|
|
|
|
static void add_atomic_switch_msr(struct vcpu_vmx *vmx, unsigned msr,
|
|
u64 guest_val, u64 host_val)
|
|
{
|
|
unsigned i;
|
|
struct msr_autoload *m = &vmx->msr_autoload;
|
|
|
|
switch (msr) {
|
|
case MSR_EFER:
|
|
if (cpu_has_load_ia32_efer) {
|
|
add_atomic_switch_msr_special(VM_ENTRY_LOAD_IA32_EFER,
|
|
VM_EXIT_LOAD_IA32_EFER,
|
|
GUEST_IA32_EFER,
|
|
HOST_IA32_EFER,
|
|
guest_val, host_val);
|
|
return;
|
|
}
|
|
break;
|
|
case MSR_CORE_PERF_GLOBAL_CTRL:
|
|
if (cpu_has_load_perf_global_ctrl) {
|
|
add_atomic_switch_msr_special(
|
|
VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL,
|
|
VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL,
|
|
GUEST_IA32_PERF_GLOBAL_CTRL,
|
|
HOST_IA32_PERF_GLOBAL_CTRL,
|
|
guest_val, host_val);
|
|
return;
|
|
}
|
|
break;
|
|
}
|
|
|
|
for (i = 0; i < m->nr; ++i)
|
|
if (m->guest[i].index == msr)
|
|
break;
|
|
|
|
if (i == NR_AUTOLOAD_MSRS) {
|
|
printk_once(KERN_WARNING"Not enough mst switch entries. "
|
|
"Can't add msr %x\n", msr);
|
|
return;
|
|
} else if (i == m->nr) {
|
|
++m->nr;
|
|
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, m->nr);
|
|
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, m->nr);
|
|
}
|
|
|
|
m->guest[i].index = msr;
|
|
m->guest[i].value = guest_val;
|
|
m->host[i].index = msr;
|
|
m->host[i].value = host_val;
|
|
}
|
|
|
|
static void reload_tss(void)
|
|
{
|
|
/*
|
|
* VT restores TR but not its size. Useless.
|
|
*/
|
|
struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
|
|
struct desc_struct *descs;
|
|
|
|
descs = (void *)gdt->address;
|
|
descs[GDT_ENTRY_TSS].type = 9; /* available TSS */
|
|
load_TR_desc();
|
|
}
|
|
|
|
static bool update_transition_efer(struct vcpu_vmx *vmx, int efer_offset)
|
|
{
|
|
u64 guest_efer;
|
|
u64 ignore_bits;
|
|
|
|
guest_efer = vmx->vcpu.arch.efer;
|
|
|
|
/*
|
|
* NX is emulated; LMA and LME handled by hardware; SCE meaninless
|
|
* outside long mode
|
|
*/
|
|
ignore_bits = EFER_NX | EFER_SCE;
|
|
#ifdef CONFIG_X86_64
|
|
ignore_bits |= EFER_LMA | EFER_LME;
|
|
/* SCE is meaningful only in long mode on Intel */
|
|
if (guest_efer & EFER_LMA)
|
|
ignore_bits &= ~(u64)EFER_SCE;
|
|
#endif
|
|
guest_efer &= ~ignore_bits;
|
|
guest_efer |= host_efer & ignore_bits;
|
|
vmx->guest_msrs[efer_offset].data = guest_efer;
|
|
vmx->guest_msrs[efer_offset].mask = ~ignore_bits;
|
|
|
|
clear_atomic_switch_msr(vmx, MSR_EFER);
|
|
/* On ept, can't emulate nx, and must switch nx atomically */
|
|
if (enable_ept && ((vmx->vcpu.arch.efer ^ host_efer) & EFER_NX)) {
|
|
guest_efer = vmx->vcpu.arch.efer;
|
|
if (!(guest_efer & EFER_LMA))
|
|
guest_efer &= ~EFER_LME;
|
|
add_atomic_switch_msr(vmx, MSR_EFER, guest_efer, host_efer);
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static unsigned long segment_base(u16 selector)
|
|
{
|
|
struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
|
|
struct desc_struct *d;
|
|
unsigned long table_base;
|
|
unsigned long v;
|
|
|
|
if (!(selector & ~3))
|
|
return 0;
|
|
|
|
table_base = gdt->address;
|
|
|
|
if (selector & 4) { /* from ldt */
|
|
u16 ldt_selector = kvm_read_ldt();
|
|
|
|
if (!(ldt_selector & ~3))
|
|
return 0;
|
|
|
|
table_base = segment_base(ldt_selector);
|
|
}
|
|
d = (struct desc_struct *)(table_base + (selector & ~7));
|
|
v = get_desc_base(d);
|
|
#ifdef CONFIG_X86_64
|
|
if (d->s == 0 && (d->type == 2 || d->type == 9 || d->type == 11))
|
|
v |= ((unsigned long)((struct ldttss_desc64 *)d)->base3) << 32;
|
|
#endif
|
|
return v;
|
|
}
|
|
|
|
static inline unsigned long kvm_read_tr_base(void)
|
|
{
|
|
u16 tr;
|
|
asm("str %0" : "=g"(tr));
|
|
return segment_base(tr);
|
|
}
|
|
|
|
static void vmx_save_host_state(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
int i;
|
|
|
|
if (vmx->host_state.loaded)
|
|
return;
|
|
|
|
vmx->host_state.loaded = 1;
|
|
/*
|
|
* Set host fs and gs selectors. Unfortunately, 22.2.3 does not
|
|
* allow segment selectors with cpl > 0 or ti == 1.
|
|
*/
|
|
vmx->host_state.ldt_sel = kvm_read_ldt();
|
|
vmx->host_state.gs_ldt_reload_needed = vmx->host_state.ldt_sel;
|
|
savesegment(fs, vmx->host_state.fs_sel);
|
|
if (!(vmx->host_state.fs_sel & 7)) {
|
|
vmcs_write16(HOST_FS_SELECTOR, vmx->host_state.fs_sel);
|
|
vmx->host_state.fs_reload_needed = 0;
|
|
} else {
|
|
vmcs_write16(HOST_FS_SELECTOR, 0);
|
|
vmx->host_state.fs_reload_needed = 1;
|
|
}
|
|
savesegment(gs, vmx->host_state.gs_sel);
|
|
if (!(vmx->host_state.gs_sel & 7))
|
|
vmcs_write16(HOST_GS_SELECTOR, vmx->host_state.gs_sel);
|
|
else {
|
|
vmcs_write16(HOST_GS_SELECTOR, 0);
|
|
vmx->host_state.gs_ldt_reload_needed = 1;
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
vmcs_writel(HOST_FS_BASE, read_msr(MSR_FS_BASE));
|
|
vmcs_writel(HOST_GS_BASE, read_msr(MSR_GS_BASE));
|
|
#else
|
|
vmcs_writel(HOST_FS_BASE, segment_base(vmx->host_state.fs_sel));
|
|
vmcs_writel(HOST_GS_BASE, segment_base(vmx->host_state.gs_sel));
|
|
#endif
|
|
|
|
#ifdef CONFIG_X86_64
|
|
rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
|
|
if (is_long_mode(&vmx->vcpu))
|
|
wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
|
|
#endif
|
|
for (i = 0; i < vmx->save_nmsrs; ++i)
|
|
kvm_set_shared_msr(vmx->guest_msrs[i].index,
|
|
vmx->guest_msrs[i].data,
|
|
vmx->guest_msrs[i].mask);
|
|
}
|
|
|
|
static void __vmx_load_host_state(struct vcpu_vmx *vmx)
|
|
{
|
|
if (!vmx->host_state.loaded)
|
|
return;
|
|
|
|
++vmx->vcpu.stat.host_state_reload;
|
|
vmx->host_state.loaded = 0;
|
|
#ifdef CONFIG_X86_64
|
|
if (is_long_mode(&vmx->vcpu))
|
|
rdmsrl(MSR_KERNEL_GS_BASE, vmx->msr_guest_kernel_gs_base);
|
|
#endif
|
|
if (vmx->host_state.gs_ldt_reload_needed) {
|
|
kvm_load_ldt(vmx->host_state.ldt_sel);
|
|
#ifdef CONFIG_X86_64
|
|
load_gs_index(vmx->host_state.gs_sel);
|
|
#else
|
|
loadsegment(gs, vmx->host_state.gs_sel);
|
|
#endif
|
|
}
|
|
if (vmx->host_state.fs_reload_needed)
|
|
loadsegment(fs, vmx->host_state.fs_sel);
|
|
reload_tss();
|
|
#ifdef CONFIG_X86_64
|
|
wrmsrl(MSR_KERNEL_GS_BASE, vmx->msr_host_kernel_gs_base);
|
|
#endif
|
|
if (current_thread_info()->status & TS_USEDFPU)
|
|
clts();
|
|
load_gdt(&__get_cpu_var(host_gdt));
|
|
}
|
|
|
|
static void vmx_load_host_state(struct vcpu_vmx *vmx)
|
|
{
|
|
preempt_disable();
|
|
__vmx_load_host_state(vmx);
|
|
preempt_enable();
|
|
}
|
|
|
|
/*
|
|
* Switches to specified vcpu, until a matching vcpu_put(), but assumes
|
|
* vcpu mutex is already taken.
|
|
*/
|
|
static void vmx_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
|
|
|
|
if (!vmm_exclusive)
|
|
kvm_cpu_vmxon(phys_addr);
|
|
else if (vmx->loaded_vmcs->cpu != cpu)
|
|
loaded_vmcs_clear(vmx->loaded_vmcs);
|
|
|
|
if (per_cpu(current_vmcs, cpu) != vmx->loaded_vmcs->vmcs) {
|
|
per_cpu(current_vmcs, cpu) = vmx->loaded_vmcs->vmcs;
|
|
vmcs_load(vmx->loaded_vmcs->vmcs);
|
|
}
|
|
|
|
if (vmx->loaded_vmcs->cpu != cpu) {
|
|
struct desc_ptr *gdt = &__get_cpu_var(host_gdt);
|
|
unsigned long sysenter_esp;
|
|
|
|
kvm_make_request(KVM_REQ_TLB_FLUSH, vcpu);
|
|
local_irq_disable();
|
|
list_add(&vmx->loaded_vmcs->loaded_vmcss_on_cpu_link,
|
|
&per_cpu(loaded_vmcss_on_cpu, cpu));
|
|
local_irq_enable();
|
|
|
|
/*
|
|
* Linux uses per-cpu TSS and GDT, so set these when switching
|
|
* processors.
|
|
*/
|
|
vmcs_writel(HOST_TR_BASE, kvm_read_tr_base()); /* 22.2.4 */
|
|
vmcs_writel(HOST_GDTR_BASE, gdt->address); /* 22.2.4 */
|
|
|
|
rdmsrl(MSR_IA32_SYSENTER_ESP, sysenter_esp);
|
|
vmcs_writel(HOST_IA32_SYSENTER_ESP, sysenter_esp); /* 22.2.3 */
|
|
vmx->loaded_vmcs->cpu = cpu;
|
|
}
|
|
}
|
|
|
|
static void vmx_vcpu_put(struct kvm_vcpu *vcpu)
|
|
{
|
|
__vmx_load_host_state(to_vmx(vcpu));
|
|
if (!vmm_exclusive) {
|
|
__loaded_vmcs_clear(to_vmx(vcpu)->loaded_vmcs);
|
|
vcpu->cpu = -1;
|
|
kvm_cpu_vmxoff();
|
|
}
|
|
}
|
|
|
|
static void vmx_fpu_activate(struct kvm_vcpu *vcpu)
|
|
{
|
|
ulong cr0;
|
|
|
|
if (vcpu->fpu_active)
|
|
return;
|
|
vcpu->fpu_active = 1;
|
|
cr0 = vmcs_readl(GUEST_CR0);
|
|
cr0 &= ~(X86_CR0_TS | X86_CR0_MP);
|
|
cr0 |= kvm_read_cr0_bits(vcpu, X86_CR0_TS | X86_CR0_MP);
|
|
vmcs_writel(GUEST_CR0, cr0);
|
|
update_exception_bitmap(vcpu);
|
|
vcpu->arch.cr0_guest_owned_bits = X86_CR0_TS;
|
|
if (is_guest_mode(vcpu))
|
|
vcpu->arch.cr0_guest_owned_bits &=
|
|
~get_vmcs12(vcpu)->cr0_guest_host_mask;
|
|
vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
|
|
}
|
|
|
|
static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu);
|
|
|
|
/*
|
|
* Return the cr0 value that a nested guest would read. This is a combination
|
|
* of the real cr0 used to run the guest (guest_cr0), and the bits shadowed by
|
|
* its hypervisor (cr0_read_shadow).
|
|
*/
|
|
static inline unsigned long nested_read_cr0(struct vmcs12 *fields)
|
|
{
|
|
return (fields->guest_cr0 & ~fields->cr0_guest_host_mask) |
|
|
(fields->cr0_read_shadow & fields->cr0_guest_host_mask);
|
|
}
|
|
static inline unsigned long nested_read_cr4(struct vmcs12 *fields)
|
|
{
|
|
return (fields->guest_cr4 & ~fields->cr4_guest_host_mask) |
|
|
(fields->cr4_read_shadow & fields->cr4_guest_host_mask);
|
|
}
|
|
|
|
static void vmx_fpu_deactivate(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* Note that there is no vcpu->fpu_active = 0 here. The caller must
|
|
* set this *before* calling this function.
|
|
*/
|
|
vmx_decache_cr0_guest_bits(vcpu);
|
|
vmcs_set_bits(GUEST_CR0, X86_CR0_TS | X86_CR0_MP);
|
|
update_exception_bitmap(vcpu);
|
|
vcpu->arch.cr0_guest_owned_bits = 0;
|
|
vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
|
|
if (is_guest_mode(vcpu)) {
|
|
/*
|
|
* L1's specified read shadow might not contain the TS bit,
|
|
* so now that we turned on shadowing of this bit, we need to
|
|
* set this bit of the shadow. Like in nested_vmx_run we need
|
|
* nested_read_cr0(vmcs12), but vmcs12->guest_cr0 is not yet
|
|
* up-to-date here because we just decached cr0.TS (and we'll
|
|
* only update vmcs12->guest_cr0 on nested exit).
|
|
*/
|
|
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
|
|
vmcs12->guest_cr0 = (vmcs12->guest_cr0 & ~X86_CR0_TS) |
|
|
(vcpu->arch.cr0 & X86_CR0_TS);
|
|
vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
|
|
} else
|
|
vmcs_writel(CR0_READ_SHADOW, vcpu->arch.cr0);
|
|
}
|
|
|
|
static unsigned long vmx_get_rflags(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long rflags, save_rflags;
|
|
|
|
if (!test_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail)) {
|
|
__set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
|
|
rflags = vmcs_readl(GUEST_RFLAGS);
|
|
if (to_vmx(vcpu)->rmode.vm86_active) {
|
|
rflags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
|
|
save_rflags = to_vmx(vcpu)->rmode.save_rflags;
|
|
rflags |= save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
|
|
}
|
|
to_vmx(vcpu)->rflags = rflags;
|
|
}
|
|
return to_vmx(vcpu)->rflags;
|
|
}
|
|
|
|
static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
|
|
{
|
|
__set_bit(VCPU_EXREG_RFLAGS, (ulong *)&vcpu->arch.regs_avail);
|
|
__clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
|
|
to_vmx(vcpu)->rflags = rflags;
|
|
if (to_vmx(vcpu)->rmode.vm86_active) {
|
|
to_vmx(vcpu)->rmode.save_rflags = rflags;
|
|
rflags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
|
|
}
|
|
vmcs_writel(GUEST_RFLAGS, rflags);
|
|
}
|
|
|
|
static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
|
|
{
|
|
u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
|
|
int ret = 0;
|
|
|
|
if (interruptibility & GUEST_INTR_STATE_STI)
|
|
ret |= KVM_X86_SHADOW_INT_STI;
|
|
if (interruptibility & GUEST_INTR_STATE_MOV_SS)
|
|
ret |= KVM_X86_SHADOW_INT_MOV_SS;
|
|
|
|
return ret & mask;
|
|
}
|
|
|
|
static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
|
|
{
|
|
u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
|
|
u32 interruptibility = interruptibility_old;
|
|
|
|
interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
|
|
|
|
if (mask & KVM_X86_SHADOW_INT_MOV_SS)
|
|
interruptibility |= GUEST_INTR_STATE_MOV_SS;
|
|
else if (mask & KVM_X86_SHADOW_INT_STI)
|
|
interruptibility |= GUEST_INTR_STATE_STI;
|
|
|
|
if ((interruptibility != interruptibility_old))
|
|
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
|
|
}
|
|
|
|
static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long rip;
|
|
|
|
rip = kvm_rip_read(vcpu);
|
|
rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
|
|
kvm_rip_write(vcpu, rip);
|
|
|
|
/* skipping an emulated instruction also counts */
|
|
vmx_set_interrupt_shadow(vcpu, 0);
|
|
}
|
|
|
|
static void vmx_clear_hlt(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* Ensure that we clear the HLT state in the VMCS. We don't need to
|
|
* explicitly skip the instruction because if the HLT state is set, then
|
|
* the instruction is already executing and RIP has already been
|
|
* advanced. */
|
|
if (!yield_on_hlt &&
|
|
vmcs_read32(GUEST_ACTIVITY_STATE) == GUEST_ACTIVITY_HLT)
|
|
vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
|
|
}
|
|
|
|
/*
|
|
* KVM wants to inject page-faults which it got to the guest. This function
|
|
* checks whether in a nested guest, we need to inject them to L1 or L2.
|
|
* This function assumes it is called with the exit reason in vmcs02 being
|
|
* a #PF exception (this is the only case in which KVM injects a #PF when L2
|
|
* is running).
|
|
*/
|
|
static int nested_pf_handled(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
|
|
|
|
/* TODO: also check PFEC_MATCH/MASK, not just EB.PF. */
|
|
if (!(vmcs12->exception_bitmap & PF_VECTOR))
|
|
return 0;
|
|
|
|
nested_vmx_vmexit(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
|
|
bool has_error_code, u32 error_code,
|
|
bool reinject)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 intr_info = nr | INTR_INFO_VALID_MASK;
|
|
|
|
if (nr == PF_VECTOR && is_guest_mode(vcpu) &&
|
|
nested_pf_handled(vcpu))
|
|
return;
|
|
|
|
if (has_error_code) {
|
|
vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE, error_code);
|
|
intr_info |= INTR_INFO_DELIVER_CODE_MASK;
|
|
}
|
|
|
|
if (vmx->rmode.vm86_active) {
|
|
int inc_eip = 0;
|
|
if (kvm_exception_is_soft(nr))
|
|
inc_eip = vcpu->arch.event_exit_inst_len;
|
|
if (kvm_inject_realmode_interrupt(vcpu, nr, inc_eip) != EMULATE_DONE)
|
|
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
|
|
return;
|
|
}
|
|
|
|
if (kvm_exception_is_soft(nr)) {
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
|
|
vmx->vcpu.arch.event_exit_inst_len);
|
|
intr_info |= INTR_TYPE_SOFT_EXCEPTION;
|
|
} else
|
|
intr_info |= INTR_TYPE_HARD_EXCEPTION;
|
|
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr_info);
|
|
vmx_clear_hlt(vcpu);
|
|
}
|
|
|
|
static bool vmx_rdtscp_supported(void)
|
|
{
|
|
return cpu_has_vmx_rdtscp();
|
|
}
|
|
|
|
/*
|
|
* Swap MSR entry in host/guest MSR entry array.
|
|
*/
|
|
static void move_msr_up(struct vcpu_vmx *vmx, int from, int to)
|
|
{
|
|
struct shared_msr_entry tmp;
|
|
|
|
tmp = vmx->guest_msrs[to];
|
|
vmx->guest_msrs[to] = vmx->guest_msrs[from];
|
|
vmx->guest_msrs[from] = tmp;
|
|
}
|
|
|
|
/*
|
|
* Set up the vmcs to automatically save and restore system
|
|
* msrs. Don't touch the 64-bit msrs if the guest is in legacy
|
|
* mode, as fiddling with msrs is very expensive.
|
|
*/
|
|
static void setup_msrs(struct vcpu_vmx *vmx)
|
|
{
|
|
int save_nmsrs, index;
|
|
unsigned long *msr_bitmap;
|
|
|
|
vmx_load_host_state(vmx);
|
|
save_nmsrs = 0;
|
|
#ifdef CONFIG_X86_64
|
|
if (is_long_mode(&vmx->vcpu)) {
|
|
index = __find_msr_index(vmx, MSR_SYSCALL_MASK);
|
|
if (index >= 0)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
index = __find_msr_index(vmx, MSR_LSTAR);
|
|
if (index >= 0)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
index = __find_msr_index(vmx, MSR_CSTAR);
|
|
if (index >= 0)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
index = __find_msr_index(vmx, MSR_TSC_AUX);
|
|
if (index >= 0 && vmx->rdtscp_enabled)
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
/*
|
|
* MSR_STAR is only needed on long mode guests, and only
|
|
* if efer.sce is enabled.
|
|
*/
|
|
index = __find_msr_index(vmx, MSR_STAR);
|
|
if ((index >= 0) && (vmx->vcpu.arch.efer & EFER_SCE))
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
}
|
|
#endif
|
|
index = __find_msr_index(vmx, MSR_EFER);
|
|
if (index >= 0 && update_transition_efer(vmx, index))
|
|
move_msr_up(vmx, index, save_nmsrs++);
|
|
|
|
vmx->save_nmsrs = save_nmsrs;
|
|
|
|
if (cpu_has_vmx_msr_bitmap()) {
|
|
if (is_long_mode(&vmx->vcpu))
|
|
msr_bitmap = vmx_msr_bitmap_longmode;
|
|
else
|
|
msr_bitmap = vmx_msr_bitmap_legacy;
|
|
|
|
vmcs_write64(MSR_BITMAP, __pa(msr_bitmap));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* reads and returns guest's timestamp counter "register"
|
|
* guest_tsc = host_tsc + tsc_offset -- 21.3
|
|
*/
|
|
static u64 guest_read_tsc(void)
|
|
{
|
|
u64 host_tsc, tsc_offset;
|
|
|
|
rdtscll(host_tsc);
|
|
tsc_offset = vmcs_read64(TSC_OFFSET);
|
|
return host_tsc + tsc_offset;
|
|
}
|
|
|
|
/*
|
|
* Like guest_read_tsc, but always returns L1's notion of the timestamp
|
|
* counter, even if a nested guest (L2) is currently running.
|
|
*/
|
|
u64 vmx_read_l1_tsc(struct kvm_vcpu *vcpu)
|
|
{
|
|
u64 host_tsc, tsc_offset;
|
|
|
|
rdtscll(host_tsc);
|
|
tsc_offset = is_guest_mode(vcpu) ?
|
|
to_vmx(vcpu)->nested.vmcs01_tsc_offset :
|
|
vmcs_read64(TSC_OFFSET);
|
|
return host_tsc + tsc_offset;
|
|
}
|
|
|
|
/*
|
|
* Empty call-back. Needs to be implemented when VMX enables the SET_TSC_KHZ
|
|
* ioctl. In this case the call-back should update internal vmx state to make
|
|
* the changes effective.
|
|
*/
|
|
static void vmx_set_tsc_khz(struct kvm_vcpu *vcpu, u32 user_tsc_khz)
|
|
{
|
|
/* Nothing to do here */
|
|
}
|
|
|
|
/*
|
|
* writes 'offset' into guest's timestamp counter offset register
|
|
*/
|
|
static void vmx_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
|
|
{
|
|
if (is_guest_mode(vcpu)) {
|
|
/*
|
|
* We're here if L1 chose not to trap WRMSR to TSC. According
|
|
* to the spec, this should set L1's TSC; The offset that L1
|
|
* set for L2 remains unchanged, and still needs to be added
|
|
* to the newly set TSC to get L2's TSC.
|
|
*/
|
|
struct vmcs12 *vmcs12;
|
|
to_vmx(vcpu)->nested.vmcs01_tsc_offset = offset;
|
|
/* recalculate vmcs02.TSC_OFFSET: */
|
|
vmcs12 = get_vmcs12(vcpu);
|
|
vmcs_write64(TSC_OFFSET, offset +
|
|
(nested_cpu_has(vmcs12, CPU_BASED_USE_TSC_OFFSETING) ?
|
|
vmcs12->tsc_offset : 0));
|
|
} else {
|
|
vmcs_write64(TSC_OFFSET, offset);
|
|
}
|
|
}
|
|
|
|
static void vmx_adjust_tsc_offset(struct kvm_vcpu *vcpu, s64 adjustment)
|
|
{
|
|
u64 offset = vmcs_read64(TSC_OFFSET);
|
|
vmcs_write64(TSC_OFFSET, offset + adjustment);
|
|
if (is_guest_mode(vcpu)) {
|
|
/* Even when running L2, the adjustment needs to apply to L1 */
|
|
to_vmx(vcpu)->nested.vmcs01_tsc_offset += adjustment;
|
|
}
|
|
}
|
|
|
|
static u64 vmx_compute_tsc_offset(struct kvm_vcpu *vcpu, u64 target_tsc)
|
|
{
|
|
return target_tsc - native_read_tsc();
|
|
}
|
|
|
|
static bool guest_cpuid_has_vmx(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_cpuid_entry2 *best = kvm_find_cpuid_entry(vcpu, 1, 0);
|
|
return best && (best->ecx & (1 << (X86_FEATURE_VMX & 31)));
|
|
}
|
|
|
|
/*
|
|
* nested_vmx_allowed() checks whether a guest should be allowed to use VMX
|
|
* instructions and MSRs (i.e., nested VMX). Nested VMX is disabled for
|
|
* all guests if the "nested" module option is off, and can also be disabled
|
|
* for a single guest by disabling its VMX cpuid bit.
|
|
*/
|
|
static inline bool nested_vmx_allowed(struct kvm_vcpu *vcpu)
|
|
{
|
|
return nested && guest_cpuid_has_vmx(vcpu);
|
|
}
|
|
|
|
/*
|
|
* nested_vmx_setup_ctls_msrs() sets up variables containing the values to be
|
|
* returned for the various VMX controls MSRs when nested VMX is enabled.
|
|
* The same values should also be used to verify that vmcs12 control fields are
|
|
* valid during nested entry from L1 to L2.
|
|
* Each of these control msrs has a low and high 32-bit half: A low bit is on
|
|
* if the corresponding bit in the (32-bit) control field *must* be on, and a
|
|
* bit in the high half is on if the corresponding bit in the control field
|
|
* may be on. See also vmx_control_verify().
|
|
* TODO: allow these variables to be modified (downgraded) by module options
|
|
* or other means.
|
|
*/
|
|
static u32 nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high;
|
|
static u32 nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high;
|
|
static u32 nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high;
|
|
static u32 nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high;
|
|
static u32 nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high;
|
|
static __init void nested_vmx_setup_ctls_msrs(void)
|
|
{
|
|
/*
|
|
* Note that as a general rule, the high half of the MSRs (bits in
|
|
* the control fields which may be 1) should be initialized by the
|
|
* intersection of the underlying hardware's MSR (i.e., features which
|
|
* can be supported) and the list of features we want to expose -
|
|
* because they are known to be properly supported in our code.
|
|
* Also, usually, the low half of the MSRs (bits which must be 1) can
|
|
* be set to 0, meaning that L1 may turn off any of these bits. The
|
|
* reason is that if one of these bits is necessary, it will appear
|
|
* in vmcs01 and prepare_vmcs02, when it bitwise-or's the control
|
|
* fields of vmcs01 and vmcs02, will turn these bits off - and
|
|
* nested_vmx_exit_handled() will not pass related exits to L1.
|
|
* These rules have exceptions below.
|
|
*/
|
|
|
|
/* pin-based controls */
|
|
/*
|
|
* According to the Intel spec, if bit 55 of VMX_BASIC is off (as it is
|
|
* in our case), bits 1, 2 and 4 (i.e., 0x16) must be 1 in this MSR.
|
|
*/
|
|
nested_vmx_pinbased_ctls_low = 0x16 ;
|
|
nested_vmx_pinbased_ctls_high = 0x16 |
|
|
PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING |
|
|
PIN_BASED_VIRTUAL_NMIS;
|
|
|
|
/* exit controls */
|
|
nested_vmx_exit_ctls_low = 0;
|
|
/* Note that guest use of VM_EXIT_ACK_INTR_ON_EXIT is not supported. */
|
|
#ifdef CONFIG_X86_64
|
|
nested_vmx_exit_ctls_high = VM_EXIT_HOST_ADDR_SPACE_SIZE;
|
|
#else
|
|
nested_vmx_exit_ctls_high = 0;
|
|
#endif
|
|
|
|
/* entry controls */
|
|
rdmsr(MSR_IA32_VMX_ENTRY_CTLS,
|
|
nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high);
|
|
nested_vmx_entry_ctls_low = 0;
|
|
nested_vmx_entry_ctls_high &=
|
|
VM_ENTRY_LOAD_IA32_PAT | VM_ENTRY_IA32E_MODE;
|
|
|
|
/* cpu-based controls */
|
|
rdmsr(MSR_IA32_VMX_PROCBASED_CTLS,
|
|
nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high);
|
|
nested_vmx_procbased_ctls_low = 0;
|
|
nested_vmx_procbased_ctls_high &=
|
|
CPU_BASED_VIRTUAL_INTR_PENDING | CPU_BASED_USE_TSC_OFFSETING |
|
|
CPU_BASED_HLT_EXITING | CPU_BASED_INVLPG_EXITING |
|
|
CPU_BASED_MWAIT_EXITING | CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING |
|
|
#ifdef CONFIG_X86_64
|
|
CPU_BASED_CR8_LOAD_EXITING | CPU_BASED_CR8_STORE_EXITING |
|
|
#endif
|
|
CPU_BASED_MOV_DR_EXITING | CPU_BASED_UNCOND_IO_EXITING |
|
|
CPU_BASED_USE_IO_BITMAPS | CPU_BASED_MONITOR_EXITING |
|
|
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
|
|
/*
|
|
* We can allow some features even when not supported by the
|
|
* hardware. For example, L1 can specify an MSR bitmap - and we
|
|
* can use it to avoid exits to L1 - even when L0 runs L2
|
|
* without MSR bitmaps.
|
|
*/
|
|
nested_vmx_procbased_ctls_high |= CPU_BASED_USE_MSR_BITMAPS;
|
|
|
|
/* secondary cpu-based controls */
|
|
rdmsr(MSR_IA32_VMX_PROCBASED_CTLS2,
|
|
nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high);
|
|
nested_vmx_secondary_ctls_low = 0;
|
|
nested_vmx_secondary_ctls_high &=
|
|
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
|
|
}
|
|
|
|
static inline bool vmx_control_verify(u32 control, u32 low, u32 high)
|
|
{
|
|
/*
|
|
* Bits 0 in high must be 0, and bits 1 in low must be 1.
|
|
*/
|
|
return ((control & high) | low) == control;
|
|
}
|
|
|
|
static inline u64 vmx_control_msr(u32 low, u32 high)
|
|
{
|
|
return low | ((u64)high << 32);
|
|
}
|
|
|
|
/*
|
|
* If we allow our guest to use VMX instructions (i.e., nested VMX), we should
|
|
* also let it use VMX-specific MSRs.
|
|
* vmx_get_vmx_msr() and vmx_set_vmx_msr() return 1 when we handled a
|
|
* VMX-specific MSR, or 0 when we haven't (and the caller should handle it
|
|
* like all other MSRs).
|
|
*/
|
|
static int vmx_get_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
|
|
{
|
|
if (!nested_vmx_allowed(vcpu) && msr_index >= MSR_IA32_VMX_BASIC &&
|
|
msr_index <= MSR_IA32_VMX_TRUE_ENTRY_CTLS) {
|
|
/*
|
|
* According to the spec, processors which do not support VMX
|
|
* should throw a #GP(0) when VMX capability MSRs are read.
|
|
*/
|
|
kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
|
|
return 1;
|
|
}
|
|
|
|
switch (msr_index) {
|
|
case MSR_IA32_FEATURE_CONTROL:
|
|
*pdata = 0;
|
|
break;
|
|
case MSR_IA32_VMX_BASIC:
|
|
/*
|
|
* This MSR reports some information about VMX support. We
|
|
* should return information about the VMX we emulate for the
|
|
* guest, and the VMCS structure we give it - not about the
|
|
* VMX support of the underlying hardware.
|
|
*/
|
|
*pdata = VMCS12_REVISION |
|
|
((u64)VMCS12_SIZE << VMX_BASIC_VMCS_SIZE_SHIFT) |
|
|
(VMX_BASIC_MEM_TYPE_WB << VMX_BASIC_MEM_TYPE_SHIFT);
|
|
break;
|
|
case MSR_IA32_VMX_TRUE_PINBASED_CTLS:
|
|
case MSR_IA32_VMX_PINBASED_CTLS:
|
|
*pdata = vmx_control_msr(nested_vmx_pinbased_ctls_low,
|
|
nested_vmx_pinbased_ctls_high);
|
|
break;
|
|
case MSR_IA32_VMX_TRUE_PROCBASED_CTLS:
|
|
case MSR_IA32_VMX_PROCBASED_CTLS:
|
|
*pdata = vmx_control_msr(nested_vmx_procbased_ctls_low,
|
|
nested_vmx_procbased_ctls_high);
|
|
break;
|
|
case MSR_IA32_VMX_TRUE_EXIT_CTLS:
|
|
case MSR_IA32_VMX_EXIT_CTLS:
|
|
*pdata = vmx_control_msr(nested_vmx_exit_ctls_low,
|
|
nested_vmx_exit_ctls_high);
|
|
break;
|
|
case MSR_IA32_VMX_TRUE_ENTRY_CTLS:
|
|
case MSR_IA32_VMX_ENTRY_CTLS:
|
|
*pdata = vmx_control_msr(nested_vmx_entry_ctls_low,
|
|
nested_vmx_entry_ctls_high);
|
|
break;
|
|
case MSR_IA32_VMX_MISC:
|
|
*pdata = 0;
|
|
break;
|
|
/*
|
|
* These MSRs specify bits which the guest must keep fixed (on or off)
|
|
* while L1 is in VMXON mode (in L1's root mode, or running an L2).
|
|
* We picked the standard core2 setting.
|
|
*/
|
|
#define VMXON_CR0_ALWAYSON (X86_CR0_PE | X86_CR0_PG | X86_CR0_NE)
|
|
#define VMXON_CR4_ALWAYSON X86_CR4_VMXE
|
|
case MSR_IA32_VMX_CR0_FIXED0:
|
|
*pdata = VMXON_CR0_ALWAYSON;
|
|
break;
|
|
case MSR_IA32_VMX_CR0_FIXED1:
|
|
*pdata = -1ULL;
|
|
break;
|
|
case MSR_IA32_VMX_CR4_FIXED0:
|
|
*pdata = VMXON_CR4_ALWAYSON;
|
|
break;
|
|
case MSR_IA32_VMX_CR4_FIXED1:
|
|
*pdata = -1ULL;
|
|
break;
|
|
case MSR_IA32_VMX_VMCS_ENUM:
|
|
*pdata = 0x1f;
|
|
break;
|
|
case MSR_IA32_VMX_PROCBASED_CTLS2:
|
|
*pdata = vmx_control_msr(nested_vmx_secondary_ctls_low,
|
|
nested_vmx_secondary_ctls_high);
|
|
break;
|
|
case MSR_IA32_VMX_EPT_VPID_CAP:
|
|
/* Currently, no nested ept or nested vpid */
|
|
*pdata = 0;
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int vmx_set_vmx_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
|
|
{
|
|
if (!nested_vmx_allowed(vcpu))
|
|
return 0;
|
|
|
|
if (msr_index == MSR_IA32_FEATURE_CONTROL)
|
|
/* TODO: the right thing. */
|
|
return 1;
|
|
/*
|
|
* No need to treat VMX capability MSRs specially: If we don't handle
|
|
* them, handle_wrmsr will #GP(0), which is correct (they are readonly)
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reads an msr value (of 'msr_index') into 'pdata'.
|
|
* Returns 0 on success, non-0 otherwise.
|
|
* Assumes vcpu_load() was already called.
|
|
*/
|
|
static int vmx_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
|
|
{
|
|
u64 data;
|
|
struct shared_msr_entry *msr;
|
|
|
|
if (!pdata) {
|
|
printk(KERN_ERR "BUG: get_msr called with NULL pdata\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
switch (msr_index) {
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_FS_BASE:
|
|
data = vmcs_readl(GUEST_FS_BASE);
|
|
break;
|
|
case MSR_GS_BASE:
|
|
data = vmcs_readl(GUEST_GS_BASE);
|
|
break;
|
|
case MSR_KERNEL_GS_BASE:
|
|
vmx_load_host_state(to_vmx(vcpu));
|
|
data = to_vmx(vcpu)->msr_guest_kernel_gs_base;
|
|
break;
|
|
#endif
|
|
case MSR_EFER:
|
|
return kvm_get_msr_common(vcpu, msr_index, pdata);
|
|
case MSR_IA32_TSC:
|
|
data = guest_read_tsc();
|
|
break;
|
|
case MSR_IA32_SYSENTER_CS:
|
|
data = vmcs_read32(GUEST_SYSENTER_CS);
|
|
break;
|
|
case MSR_IA32_SYSENTER_EIP:
|
|
data = vmcs_readl(GUEST_SYSENTER_EIP);
|
|
break;
|
|
case MSR_IA32_SYSENTER_ESP:
|
|
data = vmcs_readl(GUEST_SYSENTER_ESP);
|
|
break;
|
|
case MSR_TSC_AUX:
|
|
if (!to_vmx(vcpu)->rdtscp_enabled)
|
|
return 1;
|
|
/* Otherwise falls through */
|
|
default:
|
|
vmx_load_host_state(to_vmx(vcpu));
|
|
if (vmx_get_vmx_msr(vcpu, msr_index, pdata))
|
|
return 0;
|
|
msr = find_msr_entry(to_vmx(vcpu), msr_index);
|
|
if (msr) {
|
|
vmx_load_host_state(to_vmx(vcpu));
|
|
data = msr->data;
|
|
break;
|
|
}
|
|
return kvm_get_msr_common(vcpu, msr_index, pdata);
|
|
}
|
|
|
|
*pdata = data;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Writes msr value into into the appropriate "register".
|
|
* Returns 0 on success, non-0 otherwise.
|
|
* Assumes vcpu_load() was already called.
|
|
*/
|
|
static int vmx_set_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 data)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct shared_msr_entry *msr;
|
|
int ret = 0;
|
|
|
|
switch (msr_index) {
|
|
case MSR_EFER:
|
|
vmx_load_host_state(vmx);
|
|
ret = kvm_set_msr_common(vcpu, msr_index, data);
|
|
break;
|
|
#ifdef CONFIG_X86_64
|
|
case MSR_FS_BASE:
|
|
vmx_segment_cache_clear(vmx);
|
|
vmcs_writel(GUEST_FS_BASE, data);
|
|
break;
|
|
case MSR_GS_BASE:
|
|
vmx_segment_cache_clear(vmx);
|
|
vmcs_writel(GUEST_GS_BASE, data);
|
|
break;
|
|
case MSR_KERNEL_GS_BASE:
|
|
vmx_load_host_state(vmx);
|
|
vmx->msr_guest_kernel_gs_base = data;
|
|
break;
|
|
#endif
|
|
case MSR_IA32_SYSENTER_CS:
|
|
vmcs_write32(GUEST_SYSENTER_CS, data);
|
|
break;
|
|
case MSR_IA32_SYSENTER_EIP:
|
|
vmcs_writel(GUEST_SYSENTER_EIP, data);
|
|
break;
|
|
case MSR_IA32_SYSENTER_ESP:
|
|
vmcs_writel(GUEST_SYSENTER_ESP, data);
|
|
break;
|
|
case MSR_IA32_TSC:
|
|
kvm_write_tsc(vcpu, data);
|
|
break;
|
|
case MSR_IA32_CR_PAT:
|
|
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
|
|
vmcs_write64(GUEST_IA32_PAT, data);
|
|
vcpu->arch.pat = data;
|
|
break;
|
|
}
|
|
ret = kvm_set_msr_common(vcpu, msr_index, data);
|
|
break;
|
|
case MSR_TSC_AUX:
|
|
if (!vmx->rdtscp_enabled)
|
|
return 1;
|
|
/* Check reserved bit, higher 32 bits should be zero */
|
|
if ((data >> 32) != 0)
|
|
return 1;
|
|
/* Otherwise falls through */
|
|
default:
|
|
if (vmx_set_vmx_msr(vcpu, msr_index, data))
|
|
break;
|
|
msr = find_msr_entry(vmx, msr_index);
|
|
if (msr) {
|
|
vmx_load_host_state(vmx);
|
|
msr->data = data;
|
|
break;
|
|
}
|
|
ret = kvm_set_msr_common(vcpu, msr_index, data);
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void vmx_cache_reg(struct kvm_vcpu *vcpu, enum kvm_reg reg)
|
|
{
|
|
__set_bit(reg, (unsigned long *)&vcpu->arch.regs_avail);
|
|
switch (reg) {
|
|
case VCPU_REGS_RSP:
|
|
vcpu->arch.regs[VCPU_REGS_RSP] = vmcs_readl(GUEST_RSP);
|
|
break;
|
|
case VCPU_REGS_RIP:
|
|
vcpu->arch.regs[VCPU_REGS_RIP] = vmcs_readl(GUEST_RIP);
|
|
break;
|
|
case VCPU_EXREG_PDPTR:
|
|
if (enable_ept)
|
|
ept_save_pdptrs(vcpu);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void set_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
|
|
{
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
|
|
vmcs_writel(GUEST_DR7, dbg->arch.debugreg[7]);
|
|
else
|
|
vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
|
|
|
|
update_exception_bitmap(vcpu);
|
|
}
|
|
|
|
static __init int cpu_has_kvm_support(void)
|
|
{
|
|
return cpu_has_vmx();
|
|
}
|
|
|
|
static __init int vmx_disabled_by_bios(void)
|
|
{
|
|
u64 msr;
|
|
|
|
rdmsrl(MSR_IA32_FEATURE_CONTROL, msr);
|
|
if (msr & FEATURE_CONTROL_LOCKED) {
|
|
/* launched w/ TXT and VMX disabled */
|
|
if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
|
|
&& tboot_enabled())
|
|
return 1;
|
|
/* launched w/o TXT and VMX only enabled w/ TXT */
|
|
if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
|
|
&& (msr & FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX)
|
|
&& !tboot_enabled()) {
|
|
printk(KERN_WARNING "kvm: disable TXT in the BIOS or "
|
|
"activate TXT before enabling KVM\n");
|
|
return 1;
|
|
}
|
|
/* launched w/o TXT and VMX disabled */
|
|
if (!(msr & FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX)
|
|
&& !tboot_enabled())
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void kvm_cpu_vmxon(u64 addr)
|
|
{
|
|
asm volatile (ASM_VMX_VMXON_RAX
|
|
: : "a"(&addr), "m"(addr)
|
|
: "memory", "cc");
|
|
}
|
|
|
|
static int hardware_enable(void *garbage)
|
|
{
|
|
int cpu = raw_smp_processor_id();
|
|
u64 phys_addr = __pa(per_cpu(vmxarea, cpu));
|
|
u64 old, test_bits;
|
|
|
|
if (read_cr4() & X86_CR4_VMXE)
|
|
return -EBUSY;
|
|
|
|
INIT_LIST_HEAD(&per_cpu(loaded_vmcss_on_cpu, cpu));
|
|
rdmsrl(MSR_IA32_FEATURE_CONTROL, old);
|
|
|
|
test_bits = FEATURE_CONTROL_LOCKED;
|
|
test_bits |= FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX;
|
|
if (tboot_enabled())
|
|
test_bits |= FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX;
|
|
|
|
if ((old & test_bits) != test_bits) {
|
|
/* enable and lock */
|
|
wrmsrl(MSR_IA32_FEATURE_CONTROL, old | test_bits);
|
|
}
|
|
write_cr4(read_cr4() | X86_CR4_VMXE); /* FIXME: not cpu hotplug safe */
|
|
|
|
if (vmm_exclusive) {
|
|
kvm_cpu_vmxon(phys_addr);
|
|
ept_sync_global();
|
|
}
|
|
|
|
store_gdt(&__get_cpu_var(host_gdt));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void vmclear_local_loaded_vmcss(void)
|
|
{
|
|
int cpu = raw_smp_processor_id();
|
|
struct loaded_vmcs *v, *n;
|
|
|
|
list_for_each_entry_safe(v, n, &per_cpu(loaded_vmcss_on_cpu, cpu),
|
|
loaded_vmcss_on_cpu_link)
|
|
__loaded_vmcs_clear(v);
|
|
}
|
|
|
|
|
|
/* Just like cpu_vmxoff(), but with the __kvm_handle_fault_on_reboot()
|
|
* tricks.
|
|
*/
|
|
static void kvm_cpu_vmxoff(void)
|
|
{
|
|
asm volatile (__ex(ASM_VMX_VMXOFF) : : : "cc");
|
|
}
|
|
|
|
static void hardware_disable(void *garbage)
|
|
{
|
|
if (vmm_exclusive) {
|
|
vmclear_local_loaded_vmcss();
|
|
kvm_cpu_vmxoff();
|
|
}
|
|
write_cr4(read_cr4() & ~X86_CR4_VMXE);
|
|
}
|
|
|
|
static __init int adjust_vmx_controls(u32 ctl_min, u32 ctl_opt,
|
|
u32 msr, u32 *result)
|
|
{
|
|
u32 vmx_msr_low, vmx_msr_high;
|
|
u32 ctl = ctl_min | ctl_opt;
|
|
|
|
rdmsr(msr, vmx_msr_low, vmx_msr_high);
|
|
|
|
ctl &= vmx_msr_high; /* bit == 0 in high word ==> must be zero */
|
|
ctl |= vmx_msr_low; /* bit == 1 in low word ==> must be one */
|
|
|
|
/* Ensure minimum (required) set of control bits are supported. */
|
|
if (ctl_min & ~ctl)
|
|
return -EIO;
|
|
|
|
*result = ctl;
|
|
return 0;
|
|
}
|
|
|
|
static __init bool allow_1_setting(u32 msr, u32 ctl)
|
|
{
|
|
u32 vmx_msr_low, vmx_msr_high;
|
|
|
|
rdmsr(msr, vmx_msr_low, vmx_msr_high);
|
|
return vmx_msr_high & ctl;
|
|
}
|
|
|
|
static __init int setup_vmcs_config(struct vmcs_config *vmcs_conf)
|
|
{
|
|
u32 vmx_msr_low, vmx_msr_high;
|
|
u32 min, opt, min2, opt2;
|
|
u32 _pin_based_exec_control = 0;
|
|
u32 _cpu_based_exec_control = 0;
|
|
u32 _cpu_based_2nd_exec_control = 0;
|
|
u32 _vmexit_control = 0;
|
|
u32 _vmentry_control = 0;
|
|
|
|
min = PIN_BASED_EXT_INTR_MASK | PIN_BASED_NMI_EXITING;
|
|
opt = PIN_BASED_VIRTUAL_NMIS;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PINBASED_CTLS,
|
|
&_pin_based_exec_control) < 0)
|
|
return -EIO;
|
|
|
|
min =
|
|
#ifdef CONFIG_X86_64
|
|
CPU_BASED_CR8_LOAD_EXITING |
|
|
CPU_BASED_CR8_STORE_EXITING |
|
|
#endif
|
|
CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING |
|
|
CPU_BASED_USE_IO_BITMAPS |
|
|
CPU_BASED_MOV_DR_EXITING |
|
|
CPU_BASED_USE_TSC_OFFSETING |
|
|
CPU_BASED_MWAIT_EXITING |
|
|
CPU_BASED_MONITOR_EXITING |
|
|
CPU_BASED_INVLPG_EXITING;
|
|
|
|
if (yield_on_hlt)
|
|
min |= CPU_BASED_HLT_EXITING;
|
|
|
|
opt = CPU_BASED_TPR_SHADOW |
|
|
CPU_BASED_USE_MSR_BITMAPS |
|
|
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_PROCBASED_CTLS,
|
|
&_cpu_based_exec_control) < 0)
|
|
return -EIO;
|
|
#ifdef CONFIG_X86_64
|
|
if ((_cpu_based_exec_control & CPU_BASED_TPR_SHADOW))
|
|
_cpu_based_exec_control &= ~CPU_BASED_CR8_LOAD_EXITING &
|
|
~CPU_BASED_CR8_STORE_EXITING;
|
|
#endif
|
|
if (_cpu_based_exec_control & CPU_BASED_ACTIVATE_SECONDARY_CONTROLS) {
|
|
min2 = 0;
|
|
opt2 = SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES |
|
|
SECONDARY_EXEC_WBINVD_EXITING |
|
|
SECONDARY_EXEC_ENABLE_VPID |
|
|
SECONDARY_EXEC_ENABLE_EPT |
|
|
SECONDARY_EXEC_UNRESTRICTED_GUEST |
|
|
SECONDARY_EXEC_PAUSE_LOOP_EXITING |
|
|
SECONDARY_EXEC_RDTSCP;
|
|
if (adjust_vmx_controls(min2, opt2,
|
|
MSR_IA32_VMX_PROCBASED_CTLS2,
|
|
&_cpu_based_2nd_exec_control) < 0)
|
|
return -EIO;
|
|
}
|
|
#ifndef CONFIG_X86_64
|
|
if (!(_cpu_based_2nd_exec_control &
|
|
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES))
|
|
_cpu_based_exec_control &= ~CPU_BASED_TPR_SHADOW;
|
|
#endif
|
|
if (_cpu_based_2nd_exec_control & SECONDARY_EXEC_ENABLE_EPT) {
|
|
/* CR3 accesses and invlpg don't need to cause VM Exits when EPT
|
|
enabled */
|
|
_cpu_based_exec_control &= ~(CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING |
|
|
CPU_BASED_INVLPG_EXITING);
|
|
rdmsr(MSR_IA32_VMX_EPT_VPID_CAP,
|
|
vmx_capability.ept, vmx_capability.vpid);
|
|
}
|
|
|
|
min = 0;
|
|
#ifdef CONFIG_X86_64
|
|
min |= VM_EXIT_HOST_ADDR_SPACE_SIZE;
|
|
#endif
|
|
opt = VM_EXIT_SAVE_IA32_PAT | VM_EXIT_LOAD_IA32_PAT;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_EXIT_CTLS,
|
|
&_vmexit_control) < 0)
|
|
return -EIO;
|
|
|
|
min = 0;
|
|
opt = VM_ENTRY_LOAD_IA32_PAT;
|
|
if (adjust_vmx_controls(min, opt, MSR_IA32_VMX_ENTRY_CTLS,
|
|
&_vmentry_control) < 0)
|
|
return -EIO;
|
|
|
|
rdmsr(MSR_IA32_VMX_BASIC, vmx_msr_low, vmx_msr_high);
|
|
|
|
/* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
|
|
if ((vmx_msr_high & 0x1fff) > PAGE_SIZE)
|
|
return -EIO;
|
|
|
|
#ifdef CONFIG_X86_64
|
|
/* IA-32 SDM Vol 3B: 64-bit CPUs always have VMX_BASIC_MSR[48]==0. */
|
|
if (vmx_msr_high & (1u<<16))
|
|
return -EIO;
|
|
#endif
|
|
|
|
/* Require Write-Back (WB) memory type for VMCS accesses. */
|
|
if (((vmx_msr_high >> 18) & 15) != 6)
|
|
return -EIO;
|
|
|
|
vmcs_conf->size = vmx_msr_high & 0x1fff;
|
|
vmcs_conf->order = get_order(vmcs_config.size);
|
|
vmcs_conf->revision_id = vmx_msr_low;
|
|
|
|
vmcs_conf->pin_based_exec_ctrl = _pin_based_exec_control;
|
|
vmcs_conf->cpu_based_exec_ctrl = _cpu_based_exec_control;
|
|
vmcs_conf->cpu_based_2nd_exec_ctrl = _cpu_based_2nd_exec_control;
|
|
vmcs_conf->vmexit_ctrl = _vmexit_control;
|
|
vmcs_conf->vmentry_ctrl = _vmentry_control;
|
|
|
|
cpu_has_load_ia32_efer =
|
|
allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS,
|
|
VM_ENTRY_LOAD_IA32_EFER)
|
|
&& allow_1_setting(MSR_IA32_VMX_EXIT_CTLS,
|
|
VM_EXIT_LOAD_IA32_EFER);
|
|
|
|
cpu_has_load_perf_global_ctrl =
|
|
allow_1_setting(MSR_IA32_VMX_ENTRY_CTLS,
|
|
VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL)
|
|
&& allow_1_setting(MSR_IA32_VMX_EXIT_CTLS,
|
|
VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL);
|
|
|
|
/*
|
|
* Some cpus support VM_ENTRY_(LOAD|SAVE)_IA32_PERF_GLOBAL_CTRL
|
|
* but due to arrata below it can't be used. Workaround is to use
|
|
* msr load mechanism to switch IA32_PERF_GLOBAL_CTRL.
|
|
*
|
|
* VM Exit May Incorrectly Clear IA32_PERF_GLOBAL_CTRL [34:32]
|
|
*
|
|
* AAK155 (model 26)
|
|
* AAP115 (model 30)
|
|
* AAT100 (model 37)
|
|
* BC86,AAY89,BD102 (model 44)
|
|
* BA97 (model 46)
|
|
*
|
|
*/
|
|
if (cpu_has_load_perf_global_ctrl && boot_cpu_data.x86 == 0x6) {
|
|
switch (boot_cpu_data.x86_model) {
|
|
case 26:
|
|
case 30:
|
|
case 37:
|
|
case 44:
|
|
case 46:
|
|
cpu_has_load_perf_global_ctrl = false;
|
|
printk_once(KERN_WARNING"kvm: VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL "
|
|
"does not work properly. Using workaround\n");
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct vmcs *alloc_vmcs_cpu(int cpu)
|
|
{
|
|
int node = cpu_to_node(cpu);
|
|
struct page *pages;
|
|
struct vmcs *vmcs;
|
|
|
|
pages = alloc_pages_exact_node(node, GFP_KERNEL, vmcs_config.order);
|
|
if (!pages)
|
|
return NULL;
|
|
vmcs = page_address(pages);
|
|
memset(vmcs, 0, vmcs_config.size);
|
|
vmcs->revision_id = vmcs_config.revision_id; /* vmcs revision id */
|
|
return vmcs;
|
|
}
|
|
|
|
static struct vmcs *alloc_vmcs(void)
|
|
{
|
|
return alloc_vmcs_cpu(raw_smp_processor_id());
|
|
}
|
|
|
|
static void free_vmcs(struct vmcs *vmcs)
|
|
{
|
|
free_pages((unsigned long)vmcs, vmcs_config.order);
|
|
}
|
|
|
|
/*
|
|
* Free a VMCS, but before that VMCLEAR it on the CPU where it was last loaded
|
|
*/
|
|
static void free_loaded_vmcs(struct loaded_vmcs *loaded_vmcs)
|
|
{
|
|
if (!loaded_vmcs->vmcs)
|
|
return;
|
|
loaded_vmcs_clear(loaded_vmcs);
|
|
free_vmcs(loaded_vmcs->vmcs);
|
|
loaded_vmcs->vmcs = NULL;
|
|
}
|
|
|
|
static void free_kvm_area(void)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
free_vmcs(per_cpu(vmxarea, cpu));
|
|
per_cpu(vmxarea, cpu) = NULL;
|
|
}
|
|
}
|
|
|
|
static __init int alloc_kvm_area(void)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_possible_cpu(cpu) {
|
|
struct vmcs *vmcs;
|
|
|
|
vmcs = alloc_vmcs_cpu(cpu);
|
|
if (!vmcs) {
|
|
free_kvm_area();
|
|
return -ENOMEM;
|
|
}
|
|
|
|
per_cpu(vmxarea, cpu) = vmcs;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static __init int hardware_setup(void)
|
|
{
|
|
if (setup_vmcs_config(&vmcs_config) < 0)
|
|
return -EIO;
|
|
|
|
if (boot_cpu_has(X86_FEATURE_NX))
|
|
kvm_enable_efer_bits(EFER_NX);
|
|
|
|
if (!cpu_has_vmx_vpid())
|
|
enable_vpid = 0;
|
|
|
|
if (!cpu_has_vmx_ept() ||
|
|
!cpu_has_vmx_ept_4levels()) {
|
|
enable_ept = 0;
|
|
enable_unrestricted_guest = 0;
|
|
}
|
|
|
|
if (!cpu_has_vmx_unrestricted_guest())
|
|
enable_unrestricted_guest = 0;
|
|
|
|
if (!cpu_has_vmx_flexpriority())
|
|
flexpriority_enabled = 0;
|
|
|
|
if (!cpu_has_vmx_tpr_shadow())
|
|
kvm_x86_ops->update_cr8_intercept = NULL;
|
|
|
|
if (enable_ept && !cpu_has_vmx_ept_2m_page())
|
|
kvm_disable_largepages();
|
|
|
|
if (!cpu_has_vmx_ple())
|
|
ple_gap = 0;
|
|
|
|
if (nested)
|
|
nested_vmx_setup_ctls_msrs();
|
|
|
|
return alloc_kvm_area();
|
|
}
|
|
|
|
static __exit void hardware_unsetup(void)
|
|
{
|
|
free_kvm_area();
|
|
}
|
|
|
|
static void fix_pmode_dataseg(int seg, struct kvm_save_segment *save)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
|
|
if (vmcs_readl(sf->base) == save->base && (save->base & AR_S_MASK)) {
|
|
vmcs_write16(sf->selector, save->selector);
|
|
vmcs_writel(sf->base, save->base);
|
|
vmcs_write32(sf->limit, save->limit);
|
|
vmcs_write32(sf->ar_bytes, save->ar);
|
|
} else {
|
|
u32 dpl = (vmcs_read16(sf->selector) & SELECTOR_RPL_MASK)
|
|
<< AR_DPL_SHIFT;
|
|
vmcs_write32(sf->ar_bytes, 0x93 | dpl);
|
|
}
|
|
}
|
|
|
|
static void enter_pmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long flags;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
vmx->emulation_required = 1;
|
|
vmx->rmode.vm86_active = 0;
|
|
|
|
vmx_segment_cache_clear(vmx);
|
|
|
|
vmcs_write16(GUEST_TR_SELECTOR, vmx->rmode.tr.selector);
|
|
vmcs_writel(GUEST_TR_BASE, vmx->rmode.tr.base);
|
|
vmcs_write32(GUEST_TR_LIMIT, vmx->rmode.tr.limit);
|
|
vmcs_write32(GUEST_TR_AR_BYTES, vmx->rmode.tr.ar);
|
|
|
|
flags = vmcs_readl(GUEST_RFLAGS);
|
|
flags &= RMODE_GUEST_OWNED_EFLAGS_BITS;
|
|
flags |= vmx->rmode.save_rflags & ~RMODE_GUEST_OWNED_EFLAGS_BITS;
|
|
vmcs_writel(GUEST_RFLAGS, flags);
|
|
|
|
vmcs_writel(GUEST_CR4, (vmcs_readl(GUEST_CR4) & ~X86_CR4_VME) |
|
|
(vmcs_readl(CR4_READ_SHADOW) & X86_CR4_VME));
|
|
|
|
update_exception_bitmap(vcpu);
|
|
|
|
if (emulate_invalid_guest_state)
|
|
return;
|
|
|
|
fix_pmode_dataseg(VCPU_SREG_ES, &vmx->rmode.es);
|
|
fix_pmode_dataseg(VCPU_SREG_DS, &vmx->rmode.ds);
|
|
fix_pmode_dataseg(VCPU_SREG_GS, &vmx->rmode.gs);
|
|
fix_pmode_dataseg(VCPU_SREG_FS, &vmx->rmode.fs);
|
|
|
|
vmx_segment_cache_clear(vmx);
|
|
|
|
vmcs_write16(GUEST_SS_SELECTOR, 0);
|
|
vmcs_write32(GUEST_SS_AR_BYTES, 0x93);
|
|
|
|
vmcs_write16(GUEST_CS_SELECTOR,
|
|
vmcs_read16(GUEST_CS_SELECTOR) & ~SELECTOR_RPL_MASK);
|
|
vmcs_write32(GUEST_CS_AR_BYTES, 0x9b);
|
|
}
|
|
|
|
static gva_t rmode_tss_base(struct kvm *kvm)
|
|
{
|
|
if (!kvm->arch.tss_addr) {
|
|
struct kvm_memslots *slots;
|
|
gfn_t base_gfn;
|
|
|
|
slots = kvm_memslots(kvm);
|
|
base_gfn = slots->memslots[0].base_gfn +
|
|
kvm->memslots->memslots[0].npages - 3;
|
|
return base_gfn << PAGE_SHIFT;
|
|
}
|
|
return kvm->arch.tss_addr;
|
|
}
|
|
|
|
static void fix_rmode_seg(int seg, struct kvm_save_segment *save)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
|
|
save->selector = vmcs_read16(sf->selector);
|
|
save->base = vmcs_readl(sf->base);
|
|
save->limit = vmcs_read32(sf->limit);
|
|
save->ar = vmcs_read32(sf->ar_bytes);
|
|
vmcs_write16(sf->selector, save->base >> 4);
|
|
vmcs_write32(sf->base, save->base & 0xffff0);
|
|
vmcs_write32(sf->limit, 0xffff);
|
|
vmcs_write32(sf->ar_bytes, 0xf3);
|
|
if (save->base & 0xf)
|
|
printk_once(KERN_WARNING "kvm: segment base is not paragraph"
|
|
" aligned when entering protected mode (seg=%d)",
|
|
seg);
|
|
}
|
|
|
|
static void enter_rmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long flags;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (enable_unrestricted_guest)
|
|
return;
|
|
|
|
vmx->emulation_required = 1;
|
|
vmx->rmode.vm86_active = 1;
|
|
|
|
/*
|
|
* Very old userspace does not call KVM_SET_TSS_ADDR before entering
|
|
* vcpu. Call it here with phys address pointing 16M below 4G.
|
|
*/
|
|
if (!vcpu->kvm->arch.tss_addr) {
|
|
printk_once(KERN_WARNING "kvm: KVM_SET_TSS_ADDR need to be "
|
|
"called before entering vcpu\n");
|
|
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
|
|
vmx_set_tss_addr(vcpu->kvm, 0xfeffd000);
|
|
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
|
|
}
|
|
|
|
vmx_segment_cache_clear(vmx);
|
|
|
|
vmx->rmode.tr.selector = vmcs_read16(GUEST_TR_SELECTOR);
|
|
vmx->rmode.tr.base = vmcs_readl(GUEST_TR_BASE);
|
|
vmcs_writel(GUEST_TR_BASE, rmode_tss_base(vcpu->kvm));
|
|
|
|
vmx->rmode.tr.limit = vmcs_read32(GUEST_TR_LIMIT);
|
|
vmcs_write32(GUEST_TR_LIMIT, RMODE_TSS_SIZE - 1);
|
|
|
|
vmx->rmode.tr.ar = vmcs_read32(GUEST_TR_AR_BYTES);
|
|
vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
|
|
|
|
flags = vmcs_readl(GUEST_RFLAGS);
|
|
vmx->rmode.save_rflags = flags;
|
|
|
|
flags |= X86_EFLAGS_IOPL | X86_EFLAGS_VM;
|
|
|
|
vmcs_writel(GUEST_RFLAGS, flags);
|
|
vmcs_writel(GUEST_CR4, vmcs_readl(GUEST_CR4) | X86_CR4_VME);
|
|
update_exception_bitmap(vcpu);
|
|
|
|
if (emulate_invalid_guest_state)
|
|
goto continue_rmode;
|
|
|
|
vmcs_write16(GUEST_SS_SELECTOR, vmcs_readl(GUEST_SS_BASE) >> 4);
|
|
vmcs_write32(GUEST_SS_LIMIT, 0xffff);
|
|
vmcs_write32(GUEST_SS_AR_BYTES, 0xf3);
|
|
|
|
vmcs_write32(GUEST_CS_AR_BYTES, 0xf3);
|
|
vmcs_write32(GUEST_CS_LIMIT, 0xffff);
|
|
if (vmcs_readl(GUEST_CS_BASE) == 0xffff0000)
|
|
vmcs_writel(GUEST_CS_BASE, 0xf0000);
|
|
vmcs_write16(GUEST_CS_SELECTOR, vmcs_readl(GUEST_CS_BASE) >> 4);
|
|
|
|
fix_rmode_seg(VCPU_SREG_ES, &vmx->rmode.es);
|
|
fix_rmode_seg(VCPU_SREG_DS, &vmx->rmode.ds);
|
|
fix_rmode_seg(VCPU_SREG_GS, &vmx->rmode.gs);
|
|
fix_rmode_seg(VCPU_SREG_FS, &vmx->rmode.fs);
|
|
|
|
continue_rmode:
|
|
kvm_mmu_reset_context(vcpu);
|
|
}
|
|
|
|
static void vmx_set_efer(struct kvm_vcpu *vcpu, u64 efer)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct shared_msr_entry *msr = find_msr_entry(vmx, MSR_EFER);
|
|
|
|
if (!msr)
|
|
return;
|
|
|
|
/*
|
|
* Force kernel_gs_base reloading before EFER changes, as control
|
|
* of this msr depends on is_long_mode().
|
|
*/
|
|
vmx_load_host_state(to_vmx(vcpu));
|
|
vcpu->arch.efer = efer;
|
|
if (efer & EFER_LMA) {
|
|
vmcs_write32(VM_ENTRY_CONTROLS,
|
|
vmcs_read32(VM_ENTRY_CONTROLS) |
|
|
VM_ENTRY_IA32E_MODE);
|
|
msr->data = efer;
|
|
} else {
|
|
vmcs_write32(VM_ENTRY_CONTROLS,
|
|
vmcs_read32(VM_ENTRY_CONTROLS) &
|
|
~VM_ENTRY_IA32E_MODE);
|
|
|
|
msr->data = efer & ~EFER_LME;
|
|
}
|
|
setup_msrs(vmx);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
|
|
static void enter_lmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 guest_tr_ar;
|
|
|
|
vmx_segment_cache_clear(to_vmx(vcpu));
|
|
|
|
guest_tr_ar = vmcs_read32(GUEST_TR_AR_BYTES);
|
|
if ((guest_tr_ar & AR_TYPE_MASK) != AR_TYPE_BUSY_64_TSS) {
|
|
pr_debug_ratelimited("%s: tss fixup for long mode. \n",
|
|
__func__);
|
|
vmcs_write32(GUEST_TR_AR_BYTES,
|
|
(guest_tr_ar & ~AR_TYPE_MASK)
|
|
| AR_TYPE_BUSY_64_TSS);
|
|
}
|
|
vmx_set_efer(vcpu, vcpu->arch.efer | EFER_LMA);
|
|
}
|
|
|
|
static void exit_lmode(struct kvm_vcpu *vcpu)
|
|
{
|
|
vmcs_write32(VM_ENTRY_CONTROLS,
|
|
vmcs_read32(VM_ENTRY_CONTROLS)
|
|
& ~VM_ENTRY_IA32E_MODE);
|
|
vmx_set_efer(vcpu, vcpu->arch.efer & ~EFER_LMA);
|
|
}
|
|
|
|
#endif
|
|
|
|
static void vmx_flush_tlb(struct kvm_vcpu *vcpu)
|
|
{
|
|
vpid_sync_context(to_vmx(vcpu));
|
|
if (enable_ept) {
|
|
if (!VALID_PAGE(vcpu->arch.mmu.root_hpa))
|
|
return;
|
|
ept_sync_context(construct_eptp(vcpu->arch.mmu.root_hpa));
|
|
}
|
|
}
|
|
|
|
static void vmx_decache_cr0_guest_bits(struct kvm_vcpu *vcpu)
|
|
{
|
|
ulong cr0_guest_owned_bits = vcpu->arch.cr0_guest_owned_bits;
|
|
|
|
vcpu->arch.cr0 &= ~cr0_guest_owned_bits;
|
|
vcpu->arch.cr0 |= vmcs_readl(GUEST_CR0) & cr0_guest_owned_bits;
|
|
}
|
|
|
|
static void vmx_decache_cr3(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (enable_ept && is_paging(vcpu))
|
|
vcpu->arch.cr3 = vmcs_readl(GUEST_CR3);
|
|
__set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
|
|
}
|
|
|
|
static void vmx_decache_cr4_guest_bits(struct kvm_vcpu *vcpu)
|
|
{
|
|
ulong cr4_guest_owned_bits = vcpu->arch.cr4_guest_owned_bits;
|
|
|
|
vcpu->arch.cr4 &= ~cr4_guest_owned_bits;
|
|
vcpu->arch.cr4 |= vmcs_readl(GUEST_CR4) & cr4_guest_owned_bits;
|
|
}
|
|
|
|
static void ept_load_pdptrs(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!test_bit(VCPU_EXREG_PDPTR,
|
|
(unsigned long *)&vcpu->arch.regs_dirty))
|
|
return;
|
|
|
|
if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
|
|
vmcs_write64(GUEST_PDPTR0, vcpu->arch.mmu.pdptrs[0]);
|
|
vmcs_write64(GUEST_PDPTR1, vcpu->arch.mmu.pdptrs[1]);
|
|
vmcs_write64(GUEST_PDPTR2, vcpu->arch.mmu.pdptrs[2]);
|
|
vmcs_write64(GUEST_PDPTR3, vcpu->arch.mmu.pdptrs[3]);
|
|
}
|
|
}
|
|
|
|
static void ept_save_pdptrs(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (is_paging(vcpu) && is_pae(vcpu) && !is_long_mode(vcpu)) {
|
|
vcpu->arch.mmu.pdptrs[0] = vmcs_read64(GUEST_PDPTR0);
|
|
vcpu->arch.mmu.pdptrs[1] = vmcs_read64(GUEST_PDPTR1);
|
|
vcpu->arch.mmu.pdptrs[2] = vmcs_read64(GUEST_PDPTR2);
|
|
vcpu->arch.mmu.pdptrs[3] = vmcs_read64(GUEST_PDPTR3);
|
|
}
|
|
|
|
__set_bit(VCPU_EXREG_PDPTR,
|
|
(unsigned long *)&vcpu->arch.regs_avail);
|
|
__set_bit(VCPU_EXREG_PDPTR,
|
|
(unsigned long *)&vcpu->arch.regs_dirty);
|
|
}
|
|
|
|
static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4);
|
|
|
|
static void ept_update_paging_mode_cr0(unsigned long *hw_cr0,
|
|
unsigned long cr0,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!test_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail))
|
|
vmx_decache_cr3(vcpu);
|
|
if (!(cr0 & X86_CR0_PG)) {
|
|
/* From paging/starting to nonpaging */
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
|
|
vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) |
|
|
(CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING));
|
|
vcpu->arch.cr0 = cr0;
|
|
vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
|
|
} else if (!is_paging(vcpu)) {
|
|
/* From nonpaging to paging */
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL,
|
|
vmcs_read32(CPU_BASED_VM_EXEC_CONTROL) &
|
|
~(CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_CR3_STORE_EXITING));
|
|
vcpu->arch.cr0 = cr0;
|
|
vmx_set_cr4(vcpu, kvm_read_cr4(vcpu));
|
|
}
|
|
|
|
if (!(cr0 & X86_CR0_WP))
|
|
*hw_cr0 &= ~X86_CR0_WP;
|
|
}
|
|
|
|
static void vmx_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
unsigned long hw_cr0;
|
|
|
|
if (enable_unrestricted_guest)
|
|
hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK_UNRESTRICTED_GUEST)
|
|
| KVM_VM_CR0_ALWAYS_ON_UNRESTRICTED_GUEST;
|
|
else
|
|
hw_cr0 = (cr0 & ~KVM_GUEST_CR0_MASK) | KVM_VM_CR0_ALWAYS_ON;
|
|
|
|
if (vmx->rmode.vm86_active && (cr0 & X86_CR0_PE))
|
|
enter_pmode(vcpu);
|
|
|
|
if (!vmx->rmode.vm86_active && !(cr0 & X86_CR0_PE))
|
|
enter_rmode(vcpu);
|
|
|
|
#ifdef CONFIG_X86_64
|
|
if (vcpu->arch.efer & EFER_LME) {
|
|
if (!is_paging(vcpu) && (cr0 & X86_CR0_PG))
|
|
enter_lmode(vcpu);
|
|
if (is_paging(vcpu) && !(cr0 & X86_CR0_PG))
|
|
exit_lmode(vcpu);
|
|
}
|
|
#endif
|
|
|
|
if (enable_ept)
|
|
ept_update_paging_mode_cr0(&hw_cr0, cr0, vcpu);
|
|
|
|
if (!vcpu->fpu_active)
|
|
hw_cr0 |= X86_CR0_TS | X86_CR0_MP;
|
|
|
|
vmcs_writel(CR0_READ_SHADOW, cr0);
|
|
vmcs_writel(GUEST_CR0, hw_cr0);
|
|
vcpu->arch.cr0 = cr0;
|
|
__clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
|
|
}
|
|
|
|
static u64 construct_eptp(unsigned long root_hpa)
|
|
{
|
|
u64 eptp;
|
|
|
|
/* TODO write the value reading from MSR */
|
|
eptp = VMX_EPT_DEFAULT_MT |
|
|
VMX_EPT_DEFAULT_GAW << VMX_EPT_GAW_EPTP_SHIFT;
|
|
eptp |= (root_hpa & PAGE_MASK);
|
|
|
|
return eptp;
|
|
}
|
|
|
|
static void vmx_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
|
|
{
|
|
unsigned long guest_cr3;
|
|
u64 eptp;
|
|
|
|
guest_cr3 = cr3;
|
|
if (enable_ept) {
|
|
eptp = construct_eptp(cr3);
|
|
vmcs_write64(EPT_POINTER, eptp);
|
|
guest_cr3 = is_paging(vcpu) ? kvm_read_cr3(vcpu) :
|
|
vcpu->kvm->arch.ept_identity_map_addr;
|
|
ept_load_pdptrs(vcpu);
|
|
}
|
|
|
|
vmx_flush_tlb(vcpu);
|
|
vmcs_writel(GUEST_CR3, guest_cr3);
|
|
}
|
|
|
|
static int vmx_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
|
|
{
|
|
unsigned long hw_cr4 = cr4 | (to_vmx(vcpu)->rmode.vm86_active ?
|
|
KVM_RMODE_VM_CR4_ALWAYS_ON : KVM_PMODE_VM_CR4_ALWAYS_ON);
|
|
|
|
if (cr4 & X86_CR4_VMXE) {
|
|
/*
|
|
* To use VMXON (and later other VMX instructions), a guest
|
|
* must first be able to turn on cr4.VMXE (see handle_vmon()).
|
|
* So basically the check on whether to allow nested VMX
|
|
* is here.
|
|
*/
|
|
if (!nested_vmx_allowed(vcpu))
|
|
return 1;
|
|
} else if (to_vmx(vcpu)->nested.vmxon)
|
|
return 1;
|
|
|
|
vcpu->arch.cr4 = cr4;
|
|
if (enable_ept) {
|
|
if (!is_paging(vcpu)) {
|
|
hw_cr4 &= ~X86_CR4_PAE;
|
|
hw_cr4 |= X86_CR4_PSE;
|
|
} else if (!(cr4 & X86_CR4_PAE)) {
|
|
hw_cr4 &= ~X86_CR4_PAE;
|
|
}
|
|
}
|
|
|
|
vmcs_writel(CR4_READ_SHADOW, cr4);
|
|
vmcs_writel(GUEST_CR4, hw_cr4);
|
|
return 0;
|
|
}
|
|
|
|
static void vmx_get_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct kvm_save_segment *save;
|
|
u32 ar;
|
|
|
|
if (vmx->rmode.vm86_active
|
|
&& (seg == VCPU_SREG_TR || seg == VCPU_SREG_ES
|
|
|| seg == VCPU_SREG_DS || seg == VCPU_SREG_FS
|
|
|| seg == VCPU_SREG_GS)
|
|
&& !emulate_invalid_guest_state) {
|
|
switch (seg) {
|
|
case VCPU_SREG_TR: save = &vmx->rmode.tr; break;
|
|
case VCPU_SREG_ES: save = &vmx->rmode.es; break;
|
|
case VCPU_SREG_DS: save = &vmx->rmode.ds; break;
|
|
case VCPU_SREG_FS: save = &vmx->rmode.fs; break;
|
|
case VCPU_SREG_GS: save = &vmx->rmode.gs; break;
|
|
default: BUG();
|
|
}
|
|
var->selector = save->selector;
|
|
var->base = save->base;
|
|
var->limit = save->limit;
|
|
ar = save->ar;
|
|
if (seg == VCPU_SREG_TR
|
|
|| var->selector == vmx_read_guest_seg_selector(vmx, seg))
|
|
goto use_saved_rmode_seg;
|
|
}
|
|
var->base = vmx_read_guest_seg_base(vmx, seg);
|
|
var->limit = vmx_read_guest_seg_limit(vmx, seg);
|
|
var->selector = vmx_read_guest_seg_selector(vmx, seg);
|
|
ar = vmx_read_guest_seg_ar(vmx, seg);
|
|
use_saved_rmode_seg:
|
|
if ((ar & AR_UNUSABLE_MASK) && !emulate_invalid_guest_state)
|
|
ar = 0;
|
|
var->type = ar & 15;
|
|
var->s = (ar >> 4) & 1;
|
|
var->dpl = (ar >> 5) & 3;
|
|
var->present = (ar >> 7) & 1;
|
|
var->avl = (ar >> 12) & 1;
|
|
var->l = (ar >> 13) & 1;
|
|
var->db = (ar >> 14) & 1;
|
|
var->g = (ar >> 15) & 1;
|
|
var->unusable = (ar >> 16) & 1;
|
|
}
|
|
|
|
static u64 vmx_get_segment_base(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct kvm_segment s;
|
|
|
|
if (to_vmx(vcpu)->rmode.vm86_active) {
|
|
vmx_get_segment(vcpu, &s, seg);
|
|
return s.base;
|
|
}
|
|
return vmx_read_guest_seg_base(to_vmx(vcpu), seg);
|
|
}
|
|
|
|
static int __vmx_get_cpl(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!is_protmode(vcpu))
|
|
return 0;
|
|
|
|
if (!is_long_mode(vcpu)
|
|
&& (kvm_get_rflags(vcpu) & X86_EFLAGS_VM)) /* if virtual 8086 */
|
|
return 3;
|
|
|
|
return vmx_read_guest_seg_selector(to_vmx(vcpu), VCPU_SREG_CS) & 3;
|
|
}
|
|
|
|
static int vmx_get_cpl(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!test_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail)) {
|
|
__set_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
|
|
to_vmx(vcpu)->cpl = __vmx_get_cpl(vcpu);
|
|
}
|
|
return to_vmx(vcpu)->cpl;
|
|
}
|
|
|
|
|
|
static u32 vmx_segment_access_rights(struct kvm_segment *var)
|
|
{
|
|
u32 ar;
|
|
|
|
if (var->unusable)
|
|
ar = 1 << 16;
|
|
else {
|
|
ar = var->type & 15;
|
|
ar |= (var->s & 1) << 4;
|
|
ar |= (var->dpl & 3) << 5;
|
|
ar |= (var->present & 1) << 7;
|
|
ar |= (var->avl & 1) << 12;
|
|
ar |= (var->l & 1) << 13;
|
|
ar |= (var->db & 1) << 14;
|
|
ar |= (var->g & 1) << 15;
|
|
}
|
|
if (ar == 0) /* a 0 value means unusable */
|
|
ar = AR_UNUSABLE_MASK;
|
|
|
|
return ar;
|
|
}
|
|
|
|
static void vmx_set_segment(struct kvm_vcpu *vcpu,
|
|
struct kvm_segment *var, int seg)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
u32 ar;
|
|
|
|
vmx_segment_cache_clear(vmx);
|
|
|
|
if (vmx->rmode.vm86_active && seg == VCPU_SREG_TR) {
|
|
vmcs_write16(sf->selector, var->selector);
|
|
vmx->rmode.tr.selector = var->selector;
|
|
vmx->rmode.tr.base = var->base;
|
|
vmx->rmode.tr.limit = var->limit;
|
|
vmx->rmode.tr.ar = vmx_segment_access_rights(var);
|
|
return;
|
|
}
|
|
vmcs_writel(sf->base, var->base);
|
|
vmcs_write32(sf->limit, var->limit);
|
|
vmcs_write16(sf->selector, var->selector);
|
|
if (vmx->rmode.vm86_active && var->s) {
|
|
/*
|
|
* Hack real-mode segments into vm86 compatibility.
|
|
*/
|
|
if (var->base == 0xffff0000 && var->selector == 0xf000)
|
|
vmcs_writel(sf->base, 0xf0000);
|
|
ar = 0xf3;
|
|
} else
|
|
ar = vmx_segment_access_rights(var);
|
|
|
|
/*
|
|
* Fix the "Accessed" bit in AR field of segment registers for older
|
|
* qemu binaries.
|
|
* IA32 arch specifies that at the time of processor reset the
|
|
* "Accessed" bit in the AR field of segment registers is 1. And qemu
|
|
* is setting it to 0 in the usedland code. This causes invalid guest
|
|
* state vmexit when "unrestricted guest" mode is turned on.
|
|
* Fix for this setup issue in cpu_reset is being pushed in the qemu
|
|
* tree. Newer qemu binaries with that qemu fix would not need this
|
|
* kvm hack.
|
|
*/
|
|
if (enable_unrestricted_guest && (seg != VCPU_SREG_LDTR))
|
|
ar |= 0x1; /* Accessed */
|
|
|
|
vmcs_write32(sf->ar_bytes, ar);
|
|
__clear_bit(VCPU_EXREG_CPL, (ulong *)&vcpu->arch.regs_avail);
|
|
}
|
|
|
|
static void vmx_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
|
|
{
|
|
u32 ar = vmx_read_guest_seg_ar(to_vmx(vcpu), VCPU_SREG_CS);
|
|
|
|
*db = (ar >> 14) & 1;
|
|
*l = (ar >> 13) & 1;
|
|
}
|
|
|
|
static void vmx_get_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
|
|
{
|
|
dt->size = vmcs_read32(GUEST_IDTR_LIMIT);
|
|
dt->address = vmcs_readl(GUEST_IDTR_BASE);
|
|
}
|
|
|
|
static void vmx_set_idt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
|
|
{
|
|
vmcs_write32(GUEST_IDTR_LIMIT, dt->size);
|
|
vmcs_writel(GUEST_IDTR_BASE, dt->address);
|
|
}
|
|
|
|
static void vmx_get_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
|
|
{
|
|
dt->size = vmcs_read32(GUEST_GDTR_LIMIT);
|
|
dt->address = vmcs_readl(GUEST_GDTR_BASE);
|
|
}
|
|
|
|
static void vmx_set_gdt(struct kvm_vcpu *vcpu, struct desc_ptr *dt)
|
|
{
|
|
vmcs_write32(GUEST_GDTR_LIMIT, dt->size);
|
|
vmcs_writel(GUEST_GDTR_BASE, dt->address);
|
|
}
|
|
|
|
static bool rmode_segment_valid(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct kvm_segment var;
|
|
u32 ar;
|
|
|
|
vmx_get_segment(vcpu, &var, seg);
|
|
ar = vmx_segment_access_rights(&var);
|
|
|
|
if (var.base != (var.selector << 4))
|
|
return false;
|
|
if (var.limit != 0xffff)
|
|
return false;
|
|
if (ar != 0xf3)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool code_segment_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment cs;
|
|
unsigned int cs_rpl;
|
|
|
|
vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
|
|
cs_rpl = cs.selector & SELECTOR_RPL_MASK;
|
|
|
|
if (cs.unusable)
|
|
return false;
|
|
if (~cs.type & (AR_TYPE_CODE_MASK|AR_TYPE_ACCESSES_MASK))
|
|
return false;
|
|
if (!cs.s)
|
|
return false;
|
|
if (cs.type & AR_TYPE_WRITEABLE_MASK) {
|
|
if (cs.dpl > cs_rpl)
|
|
return false;
|
|
} else {
|
|
if (cs.dpl != cs_rpl)
|
|
return false;
|
|
}
|
|
if (!cs.present)
|
|
return false;
|
|
|
|
/* TODO: Add Reserved field check, this'll require a new member in the kvm_segment_field structure */
|
|
return true;
|
|
}
|
|
|
|
static bool stack_segment_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment ss;
|
|
unsigned int ss_rpl;
|
|
|
|
vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
|
|
ss_rpl = ss.selector & SELECTOR_RPL_MASK;
|
|
|
|
if (ss.unusable)
|
|
return true;
|
|
if (ss.type != 3 && ss.type != 7)
|
|
return false;
|
|
if (!ss.s)
|
|
return false;
|
|
if (ss.dpl != ss_rpl) /* DPL != RPL */
|
|
return false;
|
|
if (!ss.present)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool data_segment_valid(struct kvm_vcpu *vcpu, int seg)
|
|
{
|
|
struct kvm_segment var;
|
|
unsigned int rpl;
|
|
|
|
vmx_get_segment(vcpu, &var, seg);
|
|
rpl = var.selector & SELECTOR_RPL_MASK;
|
|
|
|
if (var.unusable)
|
|
return true;
|
|
if (!var.s)
|
|
return false;
|
|
if (!var.present)
|
|
return false;
|
|
if (~var.type & (AR_TYPE_CODE_MASK|AR_TYPE_WRITEABLE_MASK)) {
|
|
if (var.dpl < rpl) /* DPL < RPL */
|
|
return false;
|
|
}
|
|
|
|
/* TODO: Add other members to kvm_segment_field to allow checking for other access
|
|
* rights flags
|
|
*/
|
|
return true;
|
|
}
|
|
|
|
static bool tr_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment tr;
|
|
|
|
vmx_get_segment(vcpu, &tr, VCPU_SREG_TR);
|
|
|
|
if (tr.unusable)
|
|
return false;
|
|
if (tr.selector & SELECTOR_TI_MASK) /* TI = 1 */
|
|
return false;
|
|
if (tr.type != 3 && tr.type != 11) /* TODO: Check if guest is in IA32e mode */
|
|
return false;
|
|
if (!tr.present)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool ldtr_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment ldtr;
|
|
|
|
vmx_get_segment(vcpu, &ldtr, VCPU_SREG_LDTR);
|
|
|
|
if (ldtr.unusable)
|
|
return true;
|
|
if (ldtr.selector & SELECTOR_TI_MASK) /* TI = 1 */
|
|
return false;
|
|
if (ldtr.type != 2)
|
|
return false;
|
|
if (!ldtr.present)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static bool cs_ss_rpl_check(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment cs, ss;
|
|
|
|
vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
|
|
vmx_get_segment(vcpu, &ss, VCPU_SREG_SS);
|
|
|
|
return ((cs.selector & SELECTOR_RPL_MASK) ==
|
|
(ss.selector & SELECTOR_RPL_MASK));
|
|
}
|
|
|
|
/*
|
|
* Check if guest state is valid. Returns true if valid, false if
|
|
* not.
|
|
* We assume that registers are always usable
|
|
*/
|
|
static bool guest_state_valid(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* real mode guest state checks */
|
|
if (!is_protmode(vcpu)) {
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_CS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_SS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_DS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_ES))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_FS))
|
|
return false;
|
|
if (!rmode_segment_valid(vcpu, VCPU_SREG_GS))
|
|
return false;
|
|
} else {
|
|
/* protected mode guest state checks */
|
|
if (!cs_ss_rpl_check(vcpu))
|
|
return false;
|
|
if (!code_segment_valid(vcpu))
|
|
return false;
|
|
if (!stack_segment_valid(vcpu))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_DS))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_ES))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_FS))
|
|
return false;
|
|
if (!data_segment_valid(vcpu, VCPU_SREG_GS))
|
|
return false;
|
|
if (!tr_valid(vcpu))
|
|
return false;
|
|
if (!ldtr_valid(vcpu))
|
|
return false;
|
|
}
|
|
/* TODO:
|
|
* - Add checks on RIP
|
|
* - Add checks on RFLAGS
|
|
*/
|
|
|
|
return true;
|
|
}
|
|
|
|
static int init_rmode_tss(struct kvm *kvm)
|
|
{
|
|
gfn_t fn;
|
|
u16 data = 0;
|
|
int r, idx, ret = 0;
|
|
|
|
idx = srcu_read_lock(&kvm->srcu);
|
|
fn = rmode_tss_base(kvm) >> PAGE_SHIFT;
|
|
r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
data = TSS_BASE_SIZE + TSS_REDIRECTION_SIZE;
|
|
r = kvm_write_guest_page(kvm, fn++, &data,
|
|
TSS_IOPB_BASE_OFFSET, sizeof(u16));
|
|
if (r < 0)
|
|
goto out;
|
|
r = kvm_clear_guest_page(kvm, fn++, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
r = kvm_clear_guest_page(kvm, fn, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
data = ~0;
|
|
r = kvm_write_guest_page(kvm, fn, &data,
|
|
RMODE_TSS_SIZE - 2 * PAGE_SIZE - 1,
|
|
sizeof(u8));
|
|
if (r < 0)
|
|
goto out;
|
|
|
|
ret = 1;
|
|
out:
|
|
srcu_read_unlock(&kvm->srcu, idx);
|
|
return ret;
|
|
}
|
|
|
|
static int init_rmode_identity_map(struct kvm *kvm)
|
|
{
|
|
int i, idx, r, ret;
|
|
pfn_t identity_map_pfn;
|
|
u32 tmp;
|
|
|
|
if (!enable_ept)
|
|
return 1;
|
|
if (unlikely(!kvm->arch.ept_identity_pagetable)) {
|
|
printk(KERN_ERR "EPT: identity-mapping pagetable "
|
|
"haven't been allocated!\n");
|
|
return 0;
|
|
}
|
|
if (likely(kvm->arch.ept_identity_pagetable_done))
|
|
return 1;
|
|
ret = 0;
|
|
identity_map_pfn = kvm->arch.ept_identity_map_addr >> PAGE_SHIFT;
|
|
idx = srcu_read_lock(&kvm->srcu);
|
|
r = kvm_clear_guest_page(kvm, identity_map_pfn, 0, PAGE_SIZE);
|
|
if (r < 0)
|
|
goto out;
|
|
/* Set up identity-mapping pagetable for EPT in real mode */
|
|
for (i = 0; i < PT32_ENT_PER_PAGE; i++) {
|
|
tmp = (i << 22) + (_PAGE_PRESENT | _PAGE_RW | _PAGE_USER |
|
|
_PAGE_ACCESSED | _PAGE_DIRTY | _PAGE_PSE);
|
|
r = kvm_write_guest_page(kvm, identity_map_pfn,
|
|
&tmp, i * sizeof(tmp), sizeof(tmp));
|
|
if (r < 0)
|
|
goto out;
|
|
}
|
|
kvm->arch.ept_identity_pagetable_done = true;
|
|
ret = 1;
|
|
out:
|
|
srcu_read_unlock(&kvm->srcu, idx);
|
|
return ret;
|
|
}
|
|
|
|
static void seg_setup(int seg)
|
|
{
|
|
struct kvm_vmx_segment_field *sf = &kvm_vmx_segment_fields[seg];
|
|
unsigned int ar;
|
|
|
|
vmcs_write16(sf->selector, 0);
|
|
vmcs_writel(sf->base, 0);
|
|
vmcs_write32(sf->limit, 0xffff);
|
|
if (enable_unrestricted_guest) {
|
|
ar = 0x93;
|
|
if (seg == VCPU_SREG_CS)
|
|
ar |= 0x08; /* code segment */
|
|
} else
|
|
ar = 0xf3;
|
|
|
|
vmcs_write32(sf->ar_bytes, ar);
|
|
}
|
|
|
|
static int alloc_apic_access_page(struct kvm *kvm)
|
|
{
|
|
struct kvm_userspace_memory_region kvm_userspace_mem;
|
|
int r = 0;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
if (kvm->arch.apic_access_page)
|
|
goto out;
|
|
kvm_userspace_mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
|
|
kvm_userspace_mem.flags = 0;
|
|
kvm_userspace_mem.guest_phys_addr = 0xfee00000ULL;
|
|
kvm_userspace_mem.memory_size = PAGE_SIZE;
|
|
r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
|
|
if (r)
|
|
goto out;
|
|
|
|
kvm->arch.apic_access_page = gfn_to_page(kvm, 0xfee00);
|
|
out:
|
|
mutex_unlock(&kvm->slots_lock);
|
|
return r;
|
|
}
|
|
|
|
static int alloc_identity_pagetable(struct kvm *kvm)
|
|
{
|
|
struct kvm_userspace_memory_region kvm_userspace_mem;
|
|
int r = 0;
|
|
|
|
mutex_lock(&kvm->slots_lock);
|
|
if (kvm->arch.ept_identity_pagetable)
|
|
goto out;
|
|
kvm_userspace_mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
|
|
kvm_userspace_mem.flags = 0;
|
|
kvm_userspace_mem.guest_phys_addr =
|
|
kvm->arch.ept_identity_map_addr;
|
|
kvm_userspace_mem.memory_size = PAGE_SIZE;
|
|
r = __kvm_set_memory_region(kvm, &kvm_userspace_mem, 0);
|
|
if (r)
|
|
goto out;
|
|
|
|
kvm->arch.ept_identity_pagetable = gfn_to_page(kvm,
|
|
kvm->arch.ept_identity_map_addr >> PAGE_SHIFT);
|
|
out:
|
|
mutex_unlock(&kvm->slots_lock);
|
|
return r;
|
|
}
|
|
|
|
static void allocate_vpid(struct vcpu_vmx *vmx)
|
|
{
|
|
int vpid;
|
|
|
|
vmx->vpid = 0;
|
|
if (!enable_vpid)
|
|
return;
|
|
spin_lock(&vmx_vpid_lock);
|
|
vpid = find_first_zero_bit(vmx_vpid_bitmap, VMX_NR_VPIDS);
|
|
if (vpid < VMX_NR_VPIDS) {
|
|
vmx->vpid = vpid;
|
|
__set_bit(vpid, vmx_vpid_bitmap);
|
|
}
|
|
spin_unlock(&vmx_vpid_lock);
|
|
}
|
|
|
|
static void free_vpid(struct vcpu_vmx *vmx)
|
|
{
|
|
if (!enable_vpid)
|
|
return;
|
|
spin_lock(&vmx_vpid_lock);
|
|
if (vmx->vpid != 0)
|
|
__clear_bit(vmx->vpid, vmx_vpid_bitmap);
|
|
spin_unlock(&vmx_vpid_lock);
|
|
}
|
|
|
|
static void __vmx_disable_intercept_for_msr(unsigned long *msr_bitmap, u32 msr)
|
|
{
|
|
int f = sizeof(unsigned long);
|
|
|
|
if (!cpu_has_vmx_msr_bitmap())
|
|
return;
|
|
|
|
/*
|
|
* See Intel PRM Vol. 3, 20.6.9 (MSR-Bitmap Address). Early manuals
|
|
* have the write-low and read-high bitmap offsets the wrong way round.
|
|
* We can control MSRs 0x00000000-0x00001fff and 0xc0000000-0xc0001fff.
|
|
*/
|
|
if (msr <= 0x1fff) {
|
|
__clear_bit(msr, msr_bitmap + 0x000 / f); /* read-low */
|
|
__clear_bit(msr, msr_bitmap + 0x800 / f); /* write-low */
|
|
} else if ((msr >= 0xc0000000) && (msr <= 0xc0001fff)) {
|
|
msr &= 0x1fff;
|
|
__clear_bit(msr, msr_bitmap + 0x400 / f); /* read-high */
|
|
__clear_bit(msr, msr_bitmap + 0xc00 / f); /* write-high */
|
|
}
|
|
}
|
|
|
|
static void vmx_disable_intercept_for_msr(u32 msr, bool longmode_only)
|
|
{
|
|
if (!longmode_only)
|
|
__vmx_disable_intercept_for_msr(vmx_msr_bitmap_legacy, msr);
|
|
__vmx_disable_intercept_for_msr(vmx_msr_bitmap_longmode, msr);
|
|
}
|
|
|
|
/*
|
|
* Set up the vmcs's constant host-state fields, i.e., host-state fields that
|
|
* will not change in the lifetime of the guest.
|
|
* Note that host-state that does change is set elsewhere. E.g., host-state
|
|
* that is set differently for each CPU is set in vmx_vcpu_load(), not here.
|
|
*/
|
|
static void vmx_set_constant_host_state(void)
|
|
{
|
|
u32 low32, high32;
|
|
unsigned long tmpl;
|
|
struct desc_ptr dt;
|
|
|
|
vmcs_writel(HOST_CR0, read_cr0() | X86_CR0_TS); /* 22.2.3 */
|
|
vmcs_writel(HOST_CR4, read_cr4()); /* 22.2.3, 22.2.5 */
|
|
vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
|
|
|
|
vmcs_write16(HOST_CS_SELECTOR, __KERNEL_CS); /* 22.2.4 */
|
|
vmcs_write16(HOST_DS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
|
|
vmcs_write16(HOST_ES_SELECTOR, __KERNEL_DS); /* 22.2.4 */
|
|
vmcs_write16(HOST_SS_SELECTOR, __KERNEL_DS); /* 22.2.4 */
|
|
vmcs_write16(HOST_TR_SELECTOR, GDT_ENTRY_TSS*8); /* 22.2.4 */
|
|
|
|
native_store_idt(&dt);
|
|
vmcs_writel(HOST_IDTR_BASE, dt.address); /* 22.2.4 */
|
|
|
|
asm("mov $.Lkvm_vmx_return, %0" : "=r"(tmpl));
|
|
vmcs_writel(HOST_RIP, tmpl); /* 22.2.5 */
|
|
|
|
rdmsr(MSR_IA32_SYSENTER_CS, low32, high32);
|
|
vmcs_write32(HOST_IA32_SYSENTER_CS, low32);
|
|
rdmsrl(MSR_IA32_SYSENTER_EIP, tmpl);
|
|
vmcs_writel(HOST_IA32_SYSENTER_EIP, tmpl); /* 22.2.3 */
|
|
|
|
if (vmcs_config.vmexit_ctrl & VM_EXIT_LOAD_IA32_PAT) {
|
|
rdmsr(MSR_IA32_CR_PAT, low32, high32);
|
|
vmcs_write64(HOST_IA32_PAT, low32 | ((u64) high32 << 32));
|
|
}
|
|
}
|
|
|
|
static void set_cr4_guest_host_mask(struct vcpu_vmx *vmx)
|
|
{
|
|
vmx->vcpu.arch.cr4_guest_owned_bits = KVM_CR4_GUEST_OWNED_BITS;
|
|
if (enable_ept)
|
|
vmx->vcpu.arch.cr4_guest_owned_bits |= X86_CR4_PGE;
|
|
if (is_guest_mode(&vmx->vcpu))
|
|
vmx->vcpu.arch.cr4_guest_owned_bits &=
|
|
~get_vmcs12(&vmx->vcpu)->cr4_guest_host_mask;
|
|
vmcs_writel(CR4_GUEST_HOST_MASK, ~vmx->vcpu.arch.cr4_guest_owned_bits);
|
|
}
|
|
|
|
static u32 vmx_exec_control(struct vcpu_vmx *vmx)
|
|
{
|
|
u32 exec_control = vmcs_config.cpu_based_exec_ctrl;
|
|
if (!vm_need_tpr_shadow(vmx->vcpu.kvm)) {
|
|
exec_control &= ~CPU_BASED_TPR_SHADOW;
|
|
#ifdef CONFIG_X86_64
|
|
exec_control |= CPU_BASED_CR8_STORE_EXITING |
|
|
CPU_BASED_CR8_LOAD_EXITING;
|
|
#endif
|
|
}
|
|
if (!enable_ept)
|
|
exec_control |= CPU_BASED_CR3_STORE_EXITING |
|
|
CPU_BASED_CR3_LOAD_EXITING |
|
|
CPU_BASED_INVLPG_EXITING;
|
|
return exec_control;
|
|
}
|
|
|
|
static u32 vmx_secondary_exec_control(struct vcpu_vmx *vmx)
|
|
{
|
|
u32 exec_control = vmcs_config.cpu_based_2nd_exec_ctrl;
|
|
if (!vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
|
|
exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
|
|
if (vmx->vpid == 0)
|
|
exec_control &= ~SECONDARY_EXEC_ENABLE_VPID;
|
|
if (!enable_ept) {
|
|
exec_control &= ~SECONDARY_EXEC_ENABLE_EPT;
|
|
enable_unrestricted_guest = 0;
|
|
}
|
|
if (!enable_unrestricted_guest)
|
|
exec_control &= ~SECONDARY_EXEC_UNRESTRICTED_GUEST;
|
|
if (!ple_gap)
|
|
exec_control &= ~SECONDARY_EXEC_PAUSE_LOOP_EXITING;
|
|
return exec_control;
|
|
}
|
|
|
|
static void ept_set_mmio_spte_mask(void)
|
|
{
|
|
/*
|
|
* EPT Misconfigurations can be generated if the value of bits 2:0
|
|
* of an EPT paging-structure entry is 110b (write/execute).
|
|
* Also, magic bits (0xffull << 49) is set to quickly identify mmio
|
|
* spte.
|
|
*/
|
|
kvm_mmu_set_mmio_spte_mask(0xffull << 49 | 0x6ull);
|
|
}
|
|
|
|
/*
|
|
* Sets up the vmcs for emulated real mode.
|
|
*/
|
|
static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
|
|
{
|
|
#ifdef CONFIG_X86_64
|
|
unsigned long a;
|
|
#endif
|
|
int i;
|
|
|
|
/* I/O */
|
|
vmcs_write64(IO_BITMAP_A, __pa(vmx_io_bitmap_a));
|
|
vmcs_write64(IO_BITMAP_B, __pa(vmx_io_bitmap_b));
|
|
|
|
if (cpu_has_vmx_msr_bitmap())
|
|
vmcs_write64(MSR_BITMAP, __pa(vmx_msr_bitmap_legacy));
|
|
|
|
vmcs_write64(VMCS_LINK_POINTER, -1ull); /* 22.3.1.5 */
|
|
|
|
/* Control */
|
|
vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
|
|
vmcs_config.pin_based_exec_ctrl);
|
|
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, vmx_exec_control(vmx));
|
|
|
|
if (cpu_has_secondary_exec_ctrls()) {
|
|
vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
|
|
vmx_secondary_exec_control(vmx));
|
|
}
|
|
|
|
if (ple_gap) {
|
|
vmcs_write32(PLE_GAP, ple_gap);
|
|
vmcs_write32(PLE_WINDOW, ple_window);
|
|
}
|
|
|
|
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
|
|
vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH, 0);
|
|
vmcs_write32(CR3_TARGET_COUNT, 0); /* 22.2.1 */
|
|
|
|
vmcs_write16(HOST_FS_SELECTOR, 0); /* 22.2.4 */
|
|
vmcs_write16(HOST_GS_SELECTOR, 0); /* 22.2.4 */
|
|
vmx_set_constant_host_state();
|
|
#ifdef CONFIG_X86_64
|
|
rdmsrl(MSR_FS_BASE, a);
|
|
vmcs_writel(HOST_FS_BASE, a); /* 22.2.4 */
|
|
rdmsrl(MSR_GS_BASE, a);
|
|
vmcs_writel(HOST_GS_BASE, a); /* 22.2.4 */
|
|
#else
|
|
vmcs_writel(HOST_FS_BASE, 0); /* 22.2.4 */
|
|
vmcs_writel(HOST_GS_BASE, 0); /* 22.2.4 */
|
|
#endif
|
|
|
|
vmcs_write32(VM_EXIT_MSR_STORE_COUNT, 0);
|
|
vmcs_write32(VM_EXIT_MSR_LOAD_COUNT, 0);
|
|
vmcs_write64(VM_EXIT_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.host));
|
|
vmcs_write32(VM_ENTRY_MSR_LOAD_COUNT, 0);
|
|
vmcs_write64(VM_ENTRY_MSR_LOAD_ADDR, __pa(vmx->msr_autoload.guest));
|
|
|
|
if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT) {
|
|
u32 msr_low, msr_high;
|
|
u64 host_pat;
|
|
rdmsr(MSR_IA32_CR_PAT, msr_low, msr_high);
|
|
host_pat = msr_low | ((u64) msr_high << 32);
|
|
/* Write the default value follow host pat */
|
|
vmcs_write64(GUEST_IA32_PAT, host_pat);
|
|
/* Keep arch.pat sync with GUEST_IA32_PAT */
|
|
vmx->vcpu.arch.pat = host_pat;
|
|
}
|
|
|
|
for (i = 0; i < NR_VMX_MSR; ++i) {
|
|
u32 index = vmx_msr_index[i];
|
|
u32 data_low, data_high;
|
|
int j = vmx->nmsrs;
|
|
|
|
if (rdmsr_safe(index, &data_low, &data_high) < 0)
|
|
continue;
|
|
if (wrmsr_safe(index, data_low, data_high) < 0)
|
|
continue;
|
|
vmx->guest_msrs[j].index = i;
|
|
vmx->guest_msrs[j].data = 0;
|
|
vmx->guest_msrs[j].mask = -1ull;
|
|
++vmx->nmsrs;
|
|
}
|
|
|
|
vmcs_write32(VM_EXIT_CONTROLS, vmcs_config.vmexit_ctrl);
|
|
|
|
/* 22.2.1, 20.8.1 */
|
|
vmcs_write32(VM_ENTRY_CONTROLS, vmcs_config.vmentry_ctrl);
|
|
|
|
vmcs_writel(CR0_GUEST_HOST_MASK, ~0UL);
|
|
set_cr4_guest_host_mask(vmx);
|
|
|
|
kvm_write_tsc(&vmx->vcpu, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int vmx_vcpu_reset(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u64 msr;
|
|
int ret;
|
|
|
|
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP));
|
|
|
|
vmx->rmode.vm86_active = 0;
|
|
|
|
vmx->soft_vnmi_blocked = 0;
|
|
|
|
vmx->vcpu.arch.regs[VCPU_REGS_RDX] = get_rdx_init_val();
|
|
kvm_set_cr8(&vmx->vcpu, 0);
|
|
msr = 0xfee00000 | MSR_IA32_APICBASE_ENABLE;
|
|
if (kvm_vcpu_is_bsp(&vmx->vcpu))
|
|
msr |= MSR_IA32_APICBASE_BSP;
|
|
kvm_set_apic_base(&vmx->vcpu, msr);
|
|
|
|
ret = fx_init(&vmx->vcpu);
|
|
if (ret != 0)
|
|
goto out;
|
|
|
|
vmx_segment_cache_clear(vmx);
|
|
|
|
seg_setup(VCPU_SREG_CS);
|
|
/*
|
|
* GUEST_CS_BASE should really be 0xffff0000, but VT vm86 mode
|
|
* insists on having GUEST_CS_BASE == GUEST_CS_SELECTOR << 4. Sigh.
|
|
*/
|
|
if (kvm_vcpu_is_bsp(&vmx->vcpu)) {
|
|
vmcs_write16(GUEST_CS_SELECTOR, 0xf000);
|
|
vmcs_writel(GUEST_CS_BASE, 0x000f0000);
|
|
} else {
|
|
vmcs_write16(GUEST_CS_SELECTOR, vmx->vcpu.arch.sipi_vector << 8);
|
|
vmcs_writel(GUEST_CS_BASE, vmx->vcpu.arch.sipi_vector << 12);
|
|
}
|
|
|
|
seg_setup(VCPU_SREG_DS);
|
|
seg_setup(VCPU_SREG_ES);
|
|
seg_setup(VCPU_SREG_FS);
|
|
seg_setup(VCPU_SREG_GS);
|
|
seg_setup(VCPU_SREG_SS);
|
|
|
|
vmcs_write16(GUEST_TR_SELECTOR, 0);
|
|
vmcs_writel(GUEST_TR_BASE, 0);
|
|
vmcs_write32(GUEST_TR_LIMIT, 0xffff);
|
|
vmcs_write32(GUEST_TR_AR_BYTES, 0x008b);
|
|
|
|
vmcs_write16(GUEST_LDTR_SELECTOR, 0);
|
|
vmcs_writel(GUEST_LDTR_BASE, 0);
|
|
vmcs_write32(GUEST_LDTR_LIMIT, 0xffff);
|
|
vmcs_write32(GUEST_LDTR_AR_BYTES, 0x00082);
|
|
|
|
vmcs_write32(GUEST_SYSENTER_CS, 0);
|
|
vmcs_writel(GUEST_SYSENTER_ESP, 0);
|
|
vmcs_writel(GUEST_SYSENTER_EIP, 0);
|
|
|
|
vmcs_writel(GUEST_RFLAGS, 0x02);
|
|
if (kvm_vcpu_is_bsp(&vmx->vcpu))
|
|
kvm_rip_write(vcpu, 0xfff0);
|
|
else
|
|
kvm_rip_write(vcpu, 0);
|
|
kvm_register_write(vcpu, VCPU_REGS_RSP, 0);
|
|
|
|
vmcs_writel(GUEST_DR7, 0x400);
|
|
|
|
vmcs_writel(GUEST_GDTR_BASE, 0);
|
|
vmcs_write32(GUEST_GDTR_LIMIT, 0xffff);
|
|
|
|
vmcs_writel(GUEST_IDTR_BASE, 0);
|
|
vmcs_write32(GUEST_IDTR_LIMIT, 0xffff);
|
|
|
|
vmcs_write32(GUEST_ACTIVITY_STATE, GUEST_ACTIVITY_ACTIVE);
|
|
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, 0);
|
|
vmcs_write32(GUEST_PENDING_DBG_EXCEPTIONS, 0);
|
|
|
|
/* Special registers */
|
|
vmcs_write64(GUEST_IA32_DEBUGCTL, 0);
|
|
|
|
setup_msrs(vmx);
|
|
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0); /* 22.2.1 */
|
|
|
|
if (cpu_has_vmx_tpr_shadow()) {
|
|
vmcs_write64(VIRTUAL_APIC_PAGE_ADDR, 0);
|
|
if (vm_need_tpr_shadow(vmx->vcpu.kvm))
|
|
vmcs_write64(VIRTUAL_APIC_PAGE_ADDR,
|
|
__pa(vmx->vcpu.arch.apic->regs));
|
|
vmcs_write32(TPR_THRESHOLD, 0);
|
|
}
|
|
|
|
if (vm_need_virtualize_apic_accesses(vmx->vcpu.kvm))
|
|
vmcs_write64(APIC_ACCESS_ADDR,
|
|
page_to_phys(vmx->vcpu.kvm->arch.apic_access_page));
|
|
|
|
if (vmx->vpid != 0)
|
|
vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
|
|
|
|
vmx->vcpu.arch.cr0 = X86_CR0_NW | X86_CR0_CD | X86_CR0_ET;
|
|
vmx_set_cr0(&vmx->vcpu, kvm_read_cr0(vcpu)); /* enter rmode */
|
|
vmx_set_cr4(&vmx->vcpu, 0);
|
|
vmx_set_efer(&vmx->vcpu, 0);
|
|
vmx_fpu_activate(&vmx->vcpu);
|
|
update_exception_bitmap(&vmx->vcpu);
|
|
|
|
vpid_sync_context(vmx);
|
|
|
|
ret = 0;
|
|
|
|
/* HACK: Don't enable emulation on guest boot/reset */
|
|
vmx->emulation_required = 0;
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* In nested virtualization, check if L1 asked to exit on external interrupts.
|
|
* For most existing hypervisors, this will always return true.
|
|
*/
|
|
static bool nested_exit_on_intr(struct kvm_vcpu *vcpu)
|
|
{
|
|
return get_vmcs12(vcpu)->pin_based_vm_exec_control &
|
|
PIN_BASED_EXT_INTR_MASK;
|
|
}
|
|
|
|
static void enable_irq_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu))
|
|
/* We can get here when nested_run_pending caused
|
|
* vmx_interrupt_allowed() to return false. In this case, do
|
|
* nothing - the interrupt will be injected later.
|
|
*/
|
|
return;
|
|
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_INTR_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
}
|
|
|
|
static void enable_nmi_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
|
|
if (!cpu_has_virtual_nmis()) {
|
|
enable_irq_window(vcpu);
|
|
return;
|
|
}
|
|
|
|
if (vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_STI) {
|
|
enable_irq_window(vcpu);
|
|
return;
|
|
}
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control |= CPU_BASED_VIRTUAL_NMI_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
}
|
|
|
|
static void vmx_inject_irq(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
uint32_t intr;
|
|
int irq = vcpu->arch.interrupt.nr;
|
|
|
|
trace_kvm_inj_virq(irq);
|
|
|
|
++vcpu->stat.irq_injections;
|
|
if (vmx->rmode.vm86_active) {
|
|
int inc_eip = 0;
|
|
if (vcpu->arch.interrupt.soft)
|
|
inc_eip = vcpu->arch.event_exit_inst_len;
|
|
if (kvm_inject_realmode_interrupt(vcpu, irq, inc_eip) != EMULATE_DONE)
|
|
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
|
|
return;
|
|
}
|
|
intr = irq | INTR_INFO_VALID_MASK;
|
|
if (vcpu->arch.interrupt.soft) {
|
|
intr |= INTR_TYPE_SOFT_INTR;
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
|
|
vmx->vcpu.arch.event_exit_inst_len);
|
|
} else
|
|
intr |= INTR_TYPE_EXT_INTR;
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, intr);
|
|
vmx_clear_hlt(vcpu);
|
|
}
|
|
|
|
static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (is_guest_mode(vcpu))
|
|
return;
|
|
|
|
if (!cpu_has_virtual_nmis()) {
|
|
/*
|
|
* Tracking the NMI-blocked state in software is built upon
|
|
* finding the next open IRQ window. This, in turn, depends on
|
|
* well-behaving guests: They have to keep IRQs disabled at
|
|
* least as long as the NMI handler runs. Otherwise we may
|
|
* cause NMI nesting, maybe breaking the guest. But as this is
|
|
* highly unlikely, we can live with the residual risk.
|
|
*/
|
|
vmx->soft_vnmi_blocked = 1;
|
|
vmx->vnmi_blocked_time = 0;
|
|
}
|
|
|
|
++vcpu->stat.nmi_injections;
|
|
vmx->nmi_known_unmasked = false;
|
|
if (vmx->rmode.vm86_active) {
|
|
if (kvm_inject_realmode_interrupt(vcpu, NMI_VECTOR, 0) != EMULATE_DONE)
|
|
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
|
|
return;
|
|
}
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
|
|
INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
|
|
vmx_clear_hlt(vcpu);
|
|
}
|
|
|
|
static int vmx_nmi_allowed(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!cpu_has_virtual_nmis() && to_vmx(vcpu)->soft_vnmi_blocked)
|
|
return 0;
|
|
|
|
return !(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
|
|
(GUEST_INTR_STATE_MOV_SS | GUEST_INTR_STATE_STI
|
|
| GUEST_INTR_STATE_NMI));
|
|
}
|
|
|
|
static bool vmx_get_nmi_mask(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!cpu_has_virtual_nmis())
|
|
return to_vmx(vcpu)->soft_vnmi_blocked;
|
|
if (to_vmx(vcpu)->nmi_known_unmasked)
|
|
return false;
|
|
return vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & GUEST_INTR_STATE_NMI;
|
|
}
|
|
|
|
static void vmx_set_nmi_mask(struct kvm_vcpu *vcpu, bool masked)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (!cpu_has_virtual_nmis()) {
|
|
if (vmx->soft_vnmi_blocked != masked) {
|
|
vmx->soft_vnmi_blocked = masked;
|
|
vmx->vnmi_blocked_time = 0;
|
|
}
|
|
} else {
|
|
vmx->nmi_known_unmasked = !masked;
|
|
if (masked)
|
|
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_NMI);
|
|
else
|
|
vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_NMI);
|
|
}
|
|
}
|
|
|
|
static int vmx_interrupt_allowed(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (is_guest_mode(vcpu) && nested_exit_on_intr(vcpu)) {
|
|
struct vmcs12 *vmcs12;
|
|
if (to_vmx(vcpu)->nested.nested_run_pending)
|
|
return 0;
|
|
nested_vmx_vmexit(vcpu);
|
|
vmcs12 = get_vmcs12(vcpu);
|
|
vmcs12->vm_exit_reason = EXIT_REASON_EXTERNAL_INTERRUPT;
|
|
vmcs12->vm_exit_intr_info = 0;
|
|
/* fall through to normal code, but now in L1, not L2 */
|
|
}
|
|
|
|
return (vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
|
|
!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
|
|
(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
|
|
}
|
|
|
|
static int vmx_set_tss_addr(struct kvm *kvm, unsigned int addr)
|
|
{
|
|
int ret;
|
|
struct kvm_userspace_memory_region tss_mem = {
|
|
.slot = TSS_PRIVATE_MEMSLOT,
|
|
.guest_phys_addr = addr,
|
|
.memory_size = PAGE_SIZE * 3,
|
|
.flags = 0,
|
|
};
|
|
|
|
ret = kvm_set_memory_region(kvm, &tss_mem, 0);
|
|
if (ret)
|
|
return ret;
|
|
kvm->arch.tss_addr = addr;
|
|
if (!init_rmode_tss(kvm))
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int handle_rmode_exception(struct kvm_vcpu *vcpu,
|
|
int vec, u32 err_code)
|
|
{
|
|
/*
|
|
* Instruction with address size override prefix opcode 0x67
|
|
* Cause the #SS fault with 0 error code in VM86 mode.
|
|
*/
|
|
if (((vec == GP_VECTOR) || (vec == SS_VECTOR)) && err_code == 0)
|
|
if (emulate_instruction(vcpu, 0) == EMULATE_DONE)
|
|
return 1;
|
|
/*
|
|
* Forward all other exceptions that are valid in real mode.
|
|
* FIXME: Breaks guest debugging in real mode, needs to be fixed with
|
|
* the required debugging infrastructure rework.
|
|
*/
|
|
switch (vec) {
|
|
case DB_VECTOR:
|
|
if (vcpu->guest_debug &
|
|
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
|
|
return 0;
|
|
kvm_queue_exception(vcpu, vec);
|
|
return 1;
|
|
case BP_VECTOR:
|
|
/*
|
|
* Update instruction length as we may reinject the exception
|
|
* from user space while in guest debugging mode.
|
|
*/
|
|
to_vmx(vcpu)->vcpu.arch.event_exit_inst_len =
|
|
vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_SW_BP)
|
|
return 0;
|
|
/* fall through */
|
|
case DE_VECTOR:
|
|
case OF_VECTOR:
|
|
case BR_VECTOR:
|
|
case UD_VECTOR:
|
|
case DF_VECTOR:
|
|
case SS_VECTOR:
|
|
case GP_VECTOR:
|
|
case MF_VECTOR:
|
|
kvm_queue_exception(vcpu, vec);
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Trigger machine check on the host. We assume all the MSRs are already set up
|
|
* by the CPU and that we still run on the same CPU as the MCE occurred on.
|
|
* We pass a fake environment to the machine check handler because we want
|
|
* the guest to be always treated like user space, no matter what context
|
|
* it used internally.
|
|
*/
|
|
static void kvm_machine_check(void)
|
|
{
|
|
#if defined(CONFIG_X86_MCE) && defined(CONFIG_X86_64)
|
|
struct pt_regs regs = {
|
|
.cs = 3, /* Fake ring 3 no matter what the guest ran on */
|
|
.flags = X86_EFLAGS_IF,
|
|
};
|
|
|
|
do_machine_check(®s, 0);
|
|
#endif
|
|
}
|
|
|
|
static int handle_machine_check(struct kvm_vcpu *vcpu)
|
|
{
|
|
/* already handled by vcpu_run */
|
|
return 1;
|
|
}
|
|
|
|
static int handle_exception(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct kvm_run *kvm_run = vcpu->run;
|
|
u32 intr_info, ex_no, error_code;
|
|
unsigned long cr2, rip, dr6;
|
|
u32 vect_info;
|
|
enum emulation_result er;
|
|
|
|
vect_info = vmx->idt_vectoring_info;
|
|
intr_info = vmx->exit_intr_info;
|
|
|
|
if (is_machine_check(intr_info))
|
|
return handle_machine_check(vcpu);
|
|
|
|
if ((vect_info & VECTORING_INFO_VALID_MASK) &&
|
|
!is_page_fault(intr_info)) {
|
|
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_SIMUL_EX;
|
|
vcpu->run->internal.ndata = 2;
|
|
vcpu->run->internal.data[0] = vect_info;
|
|
vcpu->run->internal.data[1] = intr_info;
|
|
return 0;
|
|
}
|
|
|
|
if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR)
|
|
return 1; /* already handled by vmx_vcpu_run() */
|
|
|
|
if (is_no_device(intr_info)) {
|
|
vmx_fpu_activate(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
if (is_invalid_opcode(intr_info)) {
|
|
er = emulate_instruction(vcpu, EMULTYPE_TRAP_UD);
|
|
if (er != EMULATE_DONE)
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
error_code = 0;
|
|
if (intr_info & INTR_INFO_DELIVER_CODE_MASK)
|
|
error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
|
|
if (is_page_fault(intr_info)) {
|
|
/* EPT won't cause page fault directly */
|
|
BUG_ON(enable_ept);
|
|
cr2 = vmcs_readl(EXIT_QUALIFICATION);
|
|
trace_kvm_page_fault(cr2, error_code);
|
|
|
|
if (kvm_event_needs_reinjection(vcpu))
|
|
kvm_mmu_unprotect_page_virt(vcpu, cr2);
|
|
return kvm_mmu_page_fault(vcpu, cr2, error_code, NULL, 0);
|
|
}
|
|
|
|
if (vmx->rmode.vm86_active &&
|
|
handle_rmode_exception(vcpu, intr_info & INTR_INFO_VECTOR_MASK,
|
|
error_code)) {
|
|
if (vcpu->arch.halt_request) {
|
|
vcpu->arch.halt_request = 0;
|
|
return kvm_emulate_halt(vcpu);
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
ex_no = intr_info & INTR_INFO_VECTOR_MASK;
|
|
switch (ex_no) {
|
|
case DB_VECTOR:
|
|
dr6 = vmcs_readl(EXIT_QUALIFICATION);
|
|
if (!(vcpu->guest_debug &
|
|
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
|
|
vcpu->arch.dr6 = dr6 | DR6_FIXED_1;
|
|
kvm_queue_exception(vcpu, DB_VECTOR);
|
|
return 1;
|
|
}
|
|
kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
|
|
kvm_run->debug.arch.dr7 = vmcs_readl(GUEST_DR7);
|
|
/* fall through */
|
|
case BP_VECTOR:
|
|
/*
|
|
* Update instruction length as we may reinject #BP from
|
|
* user space while in guest debugging mode. Reading it for
|
|
* #DB as well causes no harm, it is not used in that case.
|
|
*/
|
|
vmx->vcpu.arch.event_exit_inst_len =
|
|
vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
|
|
kvm_run->exit_reason = KVM_EXIT_DEBUG;
|
|
rip = kvm_rip_read(vcpu);
|
|
kvm_run->debug.arch.pc = vmcs_readl(GUEST_CS_BASE) + rip;
|
|
kvm_run->debug.arch.exception = ex_no;
|
|
break;
|
|
default:
|
|
kvm_run->exit_reason = KVM_EXIT_EXCEPTION;
|
|
kvm_run->ex.exception = ex_no;
|
|
kvm_run->ex.error_code = error_code;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int handle_external_interrupt(struct kvm_vcpu *vcpu)
|
|
{
|
|
++vcpu->stat.irq_exits;
|
|
return 1;
|
|
}
|
|
|
|
static int handle_triple_fault(struct kvm_vcpu *vcpu)
|
|
{
|
|
vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
|
|
return 0;
|
|
}
|
|
|
|
static int handle_io(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long exit_qualification;
|
|
int size, in, string;
|
|
unsigned port;
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
string = (exit_qualification & 16) != 0;
|
|
in = (exit_qualification & 8) != 0;
|
|
|
|
++vcpu->stat.io_exits;
|
|
|
|
if (string || in)
|
|
return emulate_instruction(vcpu, 0) == EMULATE_DONE;
|
|
|
|
port = exit_qualification >> 16;
|
|
size = (exit_qualification & 7) + 1;
|
|
skip_emulated_instruction(vcpu);
|
|
|
|
return kvm_fast_pio_out(vcpu, size, port);
|
|
}
|
|
|
|
static void
|
|
vmx_patch_hypercall(struct kvm_vcpu *vcpu, unsigned char *hypercall)
|
|
{
|
|
/*
|
|
* Patch in the VMCALL instruction:
|
|
*/
|
|
hypercall[0] = 0x0f;
|
|
hypercall[1] = 0x01;
|
|
hypercall[2] = 0xc1;
|
|
}
|
|
|
|
/* called to set cr0 as approriate for a mov-to-cr0 exit. */
|
|
static int handle_set_cr0(struct kvm_vcpu *vcpu, unsigned long val)
|
|
{
|
|
if (to_vmx(vcpu)->nested.vmxon &&
|
|
((val & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON))
|
|
return 1;
|
|
|
|
if (is_guest_mode(vcpu)) {
|
|
/*
|
|
* We get here when L2 changed cr0 in a way that did not change
|
|
* any of L1's shadowed bits (see nested_vmx_exit_handled_cr),
|
|
* but did change L0 shadowed bits. This can currently happen
|
|
* with the TS bit: L0 may want to leave TS on (for lazy fpu
|
|
* loading) while pretending to allow the guest to change it.
|
|
*/
|
|
if (kvm_set_cr0(vcpu, (val & vcpu->arch.cr0_guest_owned_bits) |
|
|
(vcpu->arch.cr0 & ~vcpu->arch.cr0_guest_owned_bits)))
|
|
return 1;
|
|
vmcs_writel(CR0_READ_SHADOW, val);
|
|
return 0;
|
|
} else
|
|
return kvm_set_cr0(vcpu, val);
|
|
}
|
|
|
|
static int handle_set_cr4(struct kvm_vcpu *vcpu, unsigned long val)
|
|
{
|
|
if (is_guest_mode(vcpu)) {
|
|
if (kvm_set_cr4(vcpu, (val & vcpu->arch.cr4_guest_owned_bits) |
|
|
(vcpu->arch.cr4 & ~vcpu->arch.cr4_guest_owned_bits)))
|
|
return 1;
|
|
vmcs_writel(CR4_READ_SHADOW, val);
|
|
return 0;
|
|
} else
|
|
return kvm_set_cr4(vcpu, val);
|
|
}
|
|
|
|
/* called to set cr0 as approriate for clts instruction exit. */
|
|
static void handle_clts(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (is_guest_mode(vcpu)) {
|
|
/*
|
|
* We get here when L2 did CLTS, and L1 didn't shadow CR0.TS
|
|
* but we did (!fpu_active). We need to keep GUEST_CR0.TS on,
|
|
* just pretend it's off (also in arch.cr0 for fpu_activate).
|
|
*/
|
|
vmcs_writel(CR0_READ_SHADOW,
|
|
vmcs_readl(CR0_READ_SHADOW) & ~X86_CR0_TS);
|
|
vcpu->arch.cr0 &= ~X86_CR0_TS;
|
|
} else
|
|
vmx_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~X86_CR0_TS));
|
|
}
|
|
|
|
static int handle_cr(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long exit_qualification, val;
|
|
int cr;
|
|
int reg;
|
|
int err;
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
cr = exit_qualification & 15;
|
|
reg = (exit_qualification >> 8) & 15;
|
|
switch ((exit_qualification >> 4) & 3) {
|
|
case 0: /* mov to cr */
|
|
val = kvm_register_read(vcpu, reg);
|
|
trace_kvm_cr_write(cr, val);
|
|
switch (cr) {
|
|
case 0:
|
|
err = handle_set_cr0(vcpu, val);
|
|
kvm_complete_insn_gp(vcpu, err);
|
|
return 1;
|
|
case 3:
|
|
err = kvm_set_cr3(vcpu, val);
|
|
kvm_complete_insn_gp(vcpu, err);
|
|
return 1;
|
|
case 4:
|
|
err = handle_set_cr4(vcpu, val);
|
|
kvm_complete_insn_gp(vcpu, err);
|
|
return 1;
|
|
case 8: {
|
|
u8 cr8_prev = kvm_get_cr8(vcpu);
|
|
u8 cr8 = kvm_register_read(vcpu, reg);
|
|
err = kvm_set_cr8(vcpu, cr8);
|
|
kvm_complete_insn_gp(vcpu, err);
|
|
if (irqchip_in_kernel(vcpu->kvm))
|
|
return 1;
|
|
if (cr8_prev <= cr8)
|
|
return 1;
|
|
vcpu->run->exit_reason = KVM_EXIT_SET_TPR;
|
|
return 0;
|
|
}
|
|
};
|
|
break;
|
|
case 2: /* clts */
|
|
handle_clts(vcpu);
|
|
trace_kvm_cr_write(0, kvm_read_cr0(vcpu));
|
|
skip_emulated_instruction(vcpu);
|
|
vmx_fpu_activate(vcpu);
|
|
return 1;
|
|
case 1: /*mov from cr*/
|
|
switch (cr) {
|
|
case 3:
|
|
val = kvm_read_cr3(vcpu);
|
|
kvm_register_write(vcpu, reg, val);
|
|
trace_kvm_cr_read(cr, val);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
case 8:
|
|
val = kvm_get_cr8(vcpu);
|
|
kvm_register_write(vcpu, reg, val);
|
|
trace_kvm_cr_read(cr, val);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
break;
|
|
case 3: /* lmsw */
|
|
val = (exit_qualification >> LMSW_SOURCE_DATA_SHIFT) & 0x0f;
|
|
trace_kvm_cr_write(0, (kvm_read_cr0(vcpu) & ~0xful) | val);
|
|
kvm_lmsw(vcpu, val);
|
|
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
default:
|
|
break;
|
|
}
|
|
vcpu->run->exit_reason = 0;
|
|
pr_unimpl(vcpu, "unhandled control register: op %d cr %d\n",
|
|
(int)(exit_qualification >> 4) & 3, cr);
|
|
return 0;
|
|
}
|
|
|
|
static int handle_dr(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long exit_qualification;
|
|
int dr, reg;
|
|
|
|
/* Do not handle if the CPL > 0, will trigger GP on re-entry */
|
|
if (!kvm_require_cpl(vcpu, 0))
|
|
return 1;
|
|
dr = vmcs_readl(GUEST_DR7);
|
|
if (dr & DR7_GD) {
|
|
/*
|
|
* As the vm-exit takes precedence over the debug trap, we
|
|
* need to emulate the latter, either for the host or the
|
|
* guest debugging itself.
|
|
*/
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
|
|
vcpu->run->debug.arch.dr6 = vcpu->arch.dr6;
|
|
vcpu->run->debug.arch.dr7 = dr;
|
|
vcpu->run->debug.arch.pc =
|
|
vmcs_readl(GUEST_CS_BASE) +
|
|
vmcs_readl(GUEST_RIP);
|
|
vcpu->run->debug.arch.exception = DB_VECTOR;
|
|
vcpu->run->exit_reason = KVM_EXIT_DEBUG;
|
|
return 0;
|
|
} else {
|
|
vcpu->arch.dr7 &= ~DR7_GD;
|
|
vcpu->arch.dr6 |= DR6_BD;
|
|
vmcs_writel(GUEST_DR7, vcpu->arch.dr7);
|
|
kvm_queue_exception(vcpu, DB_VECTOR);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
dr = exit_qualification & DEBUG_REG_ACCESS_NUM;
|
|
reg = DEBUG_REG_ACCESS_REG(exit_qualification);
|
|
if (exit_qualification & TYPE_MOV_FROM_DR) {
|
|
unsigned long val;
|
|
if (!kvm_get_dr(vcpu, dr, &val))
|
|
kvm_register_write(vcpu, reg, val);
|
|
} else
|
|
kvm_set_dr(vcpu, dr, vcpu->arch.regs[reg]);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static void vmx_set_dr7(struct kvm_vcpu *vcpu, unsigned long val)
|
|
{
|
|
vmcs_writel(GUEST_DR7, val);
|
|
}
|
|
|
|
static int handle_cpuid(struct kvm_vcpu *vcpu)
|
|
{
|
|
kvm_emulate_cpuid(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_rdmsr(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
|
|
u64 data;
|
|
|
|
if (vmx_get_msr(vcpu, ecx, &data)) {
|
|
trace_kvm_msr_read_ex(ecx);
|
|
kvm_inject_gp(vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
trace_kvm_msr_read(ecx, data);
|
|
|
|
/* FIXME: handling of bits 32:63 of rax, rdx */
|
|
vcpu->arch.regs[VCPU_REGS_RAX] = data & -1u;
|
|
vcpu->arch.regs[VCPU_REGS_RDX] = (data >> 32) & -1u;
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_wrmsr(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 ecx = vcpu->arch.regs[VCPU_REGS_RCX];
|
|
u64 data = (vcpu->arch.regs[VCPU_REGS_RAX] & -1u)
|
|
| ((u64)(vcpu->arch.regs[VCPU_REGS_RDX] & -1u) << 32);
|
|
|
|
if (vmx_set_msr(vcpu, ecx, data) != 0) {
|
|
trace_kvm_msr_write_ex(ecx, data);
|
|
kvm_inject_gp(vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
trace_kvm_msr_write(ecx, data);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_tpr_below_threshold(struct kvm_vcpu *vcpu)
|
|
{
|
|
kvm_make_request(KVM_REQ_EVENT, vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_interrupt_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
|
|
/* clear pending irq */
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
|
|
kvm_make_request(KVM_REQ_EVENT, vcpu);
|
|
|
|
++vcpu->stat.irq_window_exits;
|
|
|
|
/*
|
|
* If the user space waits to inject interrupts, exit as soon as
|
|
* possible
|
|
*/
|
|
if (!irqchip_in_kernel(vcpu->kvm) &&
|
|
vcpu->run->request_interrupt_window &&
|
|
!kvm_cpu_has_interrupt(vcpu)) {
|
|
vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int handle_halt(struct kvm_vcpu *vcpu)
|
|
{
|
|
skip_emulated_instruction(vcpu);
|
|
return kvm_emulate_halt(vcpu);
|
|
}
|
|
|
|
static int handle_vmcall(struct kvm_vcpu *vcpu)
|
|
{
|
|
skip_emulated_instruction(vcpu);
|
|
kvm_emulate_hypercall(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_invd(struct kvm_vcpu *vcpu)
|
|
{
|
|
return emulate_instruction(vcpu, 0) == EMULATE_DONE;
|
|
}
|
|
|
|
static int handle_invlpg(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
|
|
kvm_mmu_invlpg(vcpu, exit_qualification);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_wbinvd(struct kvm_vcpu *vcpu)
|
|
{
|
|
skip_emulated_instruction(vcpu);
|
|
kvm_emulate_wbinvd(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_xsetbv(struct kvm_vcpu *vcpu)
|
|
{
|
|
u64 new_bv = kvm_read_edx_eax(vcpu);
|
|
u32 index = kvm_register_read(vcpu, VCPU_REGS_RCX);
|
|
|
|
if (kvm_set_xcr(vcpu, index, new_bv) == 0)
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int handle_apic_access(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (likely(fasteoi)) {
|
|
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
int access_type, offset;
|
|
|
|
access_type = exit_qualification & APIC_ACCESS_TYPE;
|
|
offset = exit_qualification & APIC_ACCESS_OFFSET;
|
|
/*
|
|
* Sane guest uses MOV to write EOI, with written value
|
|
* not cared. So make a short-circuit here by avoiding
|
|
* heavy instruction emulation.
|
|
*/
|
|
if ((access_type == TYPE_LINEAR_APIC_INST_WRITE) &&
|
|
(offset == APIC_EOI)) {
|
|
kvm_lapic_set_eoi(vcpu);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
}
|
|
return emulate_instruction(vcpu, 0) == EMULATE_DONE;
|
|
}
|
|
|
|
static int handle_task_switch(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
unsigned long exit_qualification;
|
|
bool has_error_code = false;
|
|
u32 error_code = 0;
|
|
u16 tss_selector;
|
|
int reason, type, idt_v;
|
|
|
|
idt_v = (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK);
|
|
type = (vmx->idt_vectoring_info & VECTORING_INFO_TYPE_MASK);
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
|
|
reason = (u32)exit_qualification >> 30;
|
|
if (reason == TASK_SWITCH_GATE && idt_v) {
|
|
switch (type) {
|
|
case INTR_TYPE_NMI_INTR:
|
|
vcpu->arch.nmi_injected = false;
|
|
vmx_set_nmi_mask(vcpu, true);
|
|
break;
|
|
case INTR_TYPE_EXT_INTR:
|
|
case INTR_TYPE_SOFT_INTR:
|
|
kvm_clear_interrupt_queue(vcpu);
|
|
break;
|
|
case INTR_TYPE_HARD_EXCEPTION:
|
|
if (vmx->idt_vectoring_info &
|
|
VECTORING_INFO_DELIVER_CODE_MASK) {
|
|
has_error_code = true;
|
|
error_code =
|
|
vmcs_read32(IDT_VECTORING_ERROR_CODE);
|
|
}
|
|
/* fall through */
|
|
case INTR_TYPE_SOFT_EXCEPTION:
|
|
kvm_clear_exception_queue(vcpu);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
tss_selector = exit_qualification;
|
|
|
|
if (!idt_v || (type != INTR_TYPE_HARD_EXCEPTION &&
|
|
type != INTR_TYPE_EXT_INTR &&
|
|
type != INTR_TYPE_NMI_INTR))
|
|
skip_emulated_instruction(vcpu);
|
|
|
|
if (kvm_task_switch(vcpu, tss_selector, reason,
|
|
has_error_code, error_code) == EMULATE_FAIL) {
|
|
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
|
|
vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
|
|
vcpu->run->internal.ndata = 0;
|
|
return 0;
|
|
}
|
|
|
|
/* clear all local breakpoint enable flags */
|
|
vmcs_writel(GUEST_DR7, vmcs_readl(GUEST_DR7) & ~55);
|
|
|
|
/*
|
|
* TODO: What about debug traps on tss switch?
|
|
* Are we supposed to inject them and update dr6?
|
|
*/
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int handle_ept_violation(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long exit_qualification;
|
|
gpa_t gpa;
|
|
int gla_validity;
|
|
|
|
exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
|
|
if (exit_qualification & (1 << 6)) {
|
|
printk(KERN_ERR "EPT: GPA exceeds GAW!\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
gla_validity = (exit_qualification >> 7) & 0x3;
|
|
if (gla_validity != 0x3 && gla_validity != 0x1 && gla_validity != 0) {
|
|
printk(KERN_ERR "EPT: Handling EPT violation failed!\n");
|
|
printk(KERN_ERR "EPT: GPA: 0x%lx, GVA: 0x%lx\n",
|
|
(long unsigned int)vmcs_read64(GUEST_PHYSICAL_ADDRESS),
|
|
vmcs_readl(GUEST_LINEAR_ADDRESS));
|
|
printk(KERN_ERR "EPT: Exit qualification is 0x%lx\n",
|
|
(long unsigned int)exit_qualification);
|
|
vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_VIOLATION;
|
|
return 0;
|
|
}
|
|
|
|
gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
|
|
trace_kvm_page_fault(gpa, exit_qualification);
|
|
return kvm_mmu_page_fault(vcpu, gpa, exit_qualification & 0x3, NULL, 0);
|
|
}
|
|
|
|
static u64 ept_rsvd_mask(u64 spte, int level)
|
|
{
|
|
int i;
|
|
u64 mask = 0;
|
|
|
|
for (i = 51; i > boot_cpu_data.x86_phys_bits; i--)
|
|
mask |= (1ULL << i);
|
|
|
|
if (level > 2)
|
|
/* bits 7:3 reserved */
|
|
mask |= 0xf8;
|
|
else if (level == 2) {
|
|
if (spte & (1ULL << 7))
|
|
/* 2MB ref, bits 20:12 reserved */
|
|
mask |= 0x1ff000;
|
|
else
|
|
/* bits 6:3 reserved */
|
|
mask |= 0x78;
|
|
}
|
|
|
|
return mask;
|
|
}
|
|
|
|
static void ept_misconfig_inspect_spte(struct kvm_vcpu *vcpu, u64 spte,
|
|
int level)
|
|
{
|
|
printk(KERN_ERR "%s: spte 0x%llx level %d\n", __func__, spte, level);
|
|
|
|
/* 010b (write-only) */
|
|
WARN_ON((spte & 0x7) == 0x2);
|
|
|
|
/* 110b (write/execute) */
|
|
WARN_ON((spte & 0x7) == 0x6);
|
|
|
|
/* 100b (execute-only) and value not supported by logical processor */
|
|
if (!cpu_has_vmx_ept_execute_only())
|
|
WARN_ON((spte & 0x7) == 0x4);
|
|
|
|
/* not 000b */
|
|
if ((spte & 0x7)) {
|
|
u64 rsvd_bits = spte & ept_rsvd_mask(spte, level);
|
|
|
|
if (rsvd_bits != 0) {
|
|
printk(KERN_ERR "%s: rsvd_bits = 0x%llx\n",
|
|
__func__, rsvd_bits);
|
|
WARN_ON(1);
|
|
}
|
|
|
|
if (level == 1 || (level == 2 && (spte & (1ULL << 7)))) {
|
|
u64 ept_mem_type = (spte & 0x38) >> 3;
|
|
|
|
if (ept_mem_type == 2 || ept_mem_type == 3 ||
|
|
ept_mem_type == 7) {
|
|
printk(KERN_ERR "%s: ept_mem_type=0x%llx\n",
|
|
__func__, ept_mem_type);
|
|
WARN_ON(1);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static int handle_ept_misconfig(struct kvm_vcpu *vcpu)
|
|
{
|
|
u64 sptes[4];
|
|
int nr_sptes, i, ret;
|
|
gpa_t gpa;
|
|
|
|
gpa = vmcs_read64(GUEST_PHYSICAL_ADDRESS);
|
|
|
|
ret = handle_mmio_page_fault_common(vcpu, gpa, true);
|
|
if (likely(ret == 1))
|
|
return x86_emulate_instruction(vcpu, gpa, 0, NULL, 0) ==
|
|
EMULATE_DONE;
|
|
if (unlikely(!ret))
|
|
return 1;
|
|
|
|
/* It is the real ept misconfig */
|
|
printk(KERN_ERR "EPT: Misconfiguration.\n");
|
|
printk(KERN_ERR "EPT: GPA: 0x%llx\n", gpa);
|
|
|
|
nr_sptes = kvm_mmu_get_spte_hierarchy(vcpu, gpa, sptes);
|
|
|
|
for (i = PT64_ROOT_LEVEL; i > PT64_ROOT_LEVEL - nr_sptes; --i)
|
|
ept_misconfig_inspect_spte(vcpu, sptes[i-1], i);
|
|
|
|
vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
vcpu->run->hw.hardware_exit_reason = EXIT_REASON_EPT_MISCONFIG;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int handle_nmi_window(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 cpu_based_vm_exec_control;
|
|
|
|
/* clear pending NMI */
|
|
cpu_based_vm_exec_control = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
cpu_based_vm_exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
|
|
++vcpu->stat.nmi_window_exits;
|
|
kvm_make_request(KVM_REQ_EVENT, vcpu);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int handle_invalid_guest_state(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
enum emulation_result err = EMULATE_DONE;
|
|
int ret = 1;
|
|
u32 cpu_exec_ctrl;
|
|
bool intr_window_requested;
|
|
|
|
cpu_exec_ctrl = vmcs_read32(CPU_BASED_VM_EXEC_CONTROL);
|
|
intr_window_requested = cpu_exec_ctrl & CPU_BASED_VIRTUAL_INTR_PENDING;
|
|
|
|
while (!guest_state_valid(vcpu)) {
|
|
if (intr_window_requested
|
|
&& (kvm_get_rflags(&vmx->vcpu) & X86_EFLAGS_IF))
|
|
return handle_interrupt_window(&vmx->vcpu);
|
|
|
|
err = emulate_instruction(vcpu, 0);
|
|
|
|
if (err == EMULATE_DO_MMIO) {
|
|
ret = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (err != EMULATE_DONE)
|
|
return 0;
|
|
|
|
if (signal_pending(current))
|
|
goto out;
|
|
if (need_resched())
|
|
schedule();
|
|
}
|
|
|
|
vmx->emulation_required = 0;
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Indicate a busy-waiting vcpu in spinlock. We do not enable the PAUSE
|
|
* exiting, so only get here on cpu with PAUSE-Loop-Exiting.
|
|
*/
|
|
static int handle_pause(struct kvm_vcpu *vcpu)
|
|
{
|
|
skip_emulated_instruction(vcpu);
|
|
kvm_vcpu_on_spin(vcpu);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int handle_invalid_op(struct kvm_vcpu *vcpu)
|
|
{
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* To run an L2 guest, we need a vmcs02 based on the L1-specified vmcs12.
|
|
* We could reuse a single VMCS for all the L2 guests, but we also want the
|
|
* option to allocate a separate vmcs02 for each separate loaded vmcs12 - this
|
|
* allows keeping them loaded on the processor, and in the future will allow
|
|
* optimizations where prepare_vmcs02 doesn't need to set all the fields on
|
|
* every entry if they never change.
|
|
* So we keep, in vmx->nested.vmcs02_pool, a cache of size VMCS02_POOL_SIZE
|
|
* (>=0) with a vmcs02 for each recently loaded vmcs12s, most recent first.
|
|
*
|
|
* The following functions allocate and free a vmcs02 in this pool.
|
|
*/
|
|
|
|
/* Get a VMCS from the pool to use as vmcs02 for the current vmcs12. */
|
|
static struct loaded_vmcs *nested_get_current_vmcs02(struct vcpu_vmx *vmx)
|
|
{
|
|
struct vmcs02_list *item;
|
|
list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
|
|
if (item->vmptr == vmx->nested.current_vmptr) {
|
|
list_move(&item->list, &vmx->nested.vmcs02_pool);
|
|
return &item->vmcs02;
|
|
}
|
|
|
|
if (vmx->nested.vmcs02_num >= max(VMCS02_POOL_SIZE, 1)) {
|
|
/* Recycle the least recently used VMCS. */
|
|
item = list_entry(vmx->nested.vmcs02_pool.prev,
|
|
struct vmcs02_list, list);
|
|
item->vmptr = vmx->nested.current_vmptr;
|
|
list_move(&item->list, &vmx->nested.vmcs02_pool);
|
|
return &item->vmcs02;
|
|
}
|
|
|
|
/* Create a new VMCS */
|
|
item = (struct vmcs02_list *)
|
|
kmalloc(sizeof(struct vmcs02_list), GFP_KERNEL);
|
|
if (!item)
|
|
return NULL;
|
|
item->vmcs02.vmcs = alloc_vmcs();
|
|
if (!item->vmcs02.vmcs) {
|
|
kfree(item);
|
|
return NULL;
|
|
}
|
|
loaded_vmcs_init(&item->vmcs02);
|
|
item->vmptr = vmx->nested.current_vmptr;
|
|
list_add(&(item->list), &(vmx->nested.vmcs02_pool));
|
|
vmx->nested.vmcs02_num++;
|
|
return &item->vmcs02;
|
|
}
|
|
|
|
/* Free and remove from pool a vmcs02 saved for a vmcs12 (if there is one) */
|
|
static void nested_free_vmcs02(struct vcpu_vmx *vmx, gpa_t vmptr)
|
|
{
|
|
struct vmcs02_list *item;
|
|
list_for_each_entry(item, &vmx->nested.vmcs02_pool, list)
|
|
if (item->vmptr == vmptr) {
|
|
free_loaded_vmcs(&item->vmcs02);
|
|
list_del(&item->list);
|
|
kfree(item);
|
|
vmx->nested.vmcs02_num--;
|
|
return;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free all VMCSs saved for this vcpu, except the one pointed by
|
|
* vmx->loaded_vmcs. These include the VMCSs in vmcs02_pool (except the one
|
|
* currently used, if running L2), and vmcs01 when running L2.
|
|
*/
|
|
static void nested_free_all_saved_vmcss(struct vcpu_vmx *vmx)
|
|
{
|
|
struct vmcs02_list *item, *n;
|
|
list_for_each_entry_safe(item, n, &vmx->nested.vmcs02_pool, list) {
|
|
if (vmx->loaded_vmcs != &item->vmcs02)
|
|
free_loaded_vmcs(&item->vmcs02);
|
|
list_del(&item->list);
|
|
kfree(item);
|
|
}
|
|
vmx->nested.vmcs02_num = 0;
|
|
|
|
if (vmx->loaded_vmcs != &vmx->vmcs01)
|
|
free_loaded_vmcs(&vmx->vmcs01);
|
|
}
|
|
|
|
/*
|
|
* Emulate the VMXON instruction.
|
|
* Currently, we just remember that VMX is active, and do not save or even
|
|
* inspect the argument to VMXON (the so-called "VMXON pointer") because we
|
|
* do not currently need to store anything in that guest-allocated memory
|
|
* region. Consequently, VMCLEAR and VMPTRLD also do not verify that the their
|
|
* argument is different from the VMXON pointer (which the spec says they do).
|
|
*/
|
|
static int handle_vmon(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment cs;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
/* The Intel VMX Instruction Reference lists a bunch of bits that
|
|
* are prerequisite to running VMXON, most notably cr4.VMXE must be
|
|
* set to 1 (see vmx_set_cr4() for when we allow the guest to set this).
|
|
* Otherwise, we should fail with #UD. We test these now:
|
|
*/
|
|
if (!kvm_read_cr4_bits(vcpu, X86_CR4_VMXE) ||
|
|
!kvm_read_cr0_bits(vcpu, X86_CR0_PE) ||
|
|
(vmx_get_rflags(vcpu) & X86_EFLAGS_VM)) {
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
|
|
if (is_long_mode(vcpu) && !cs.l) {
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
if (vmx_get_cpl(vcpu)) {
|
|
kvm_inject_gp(vcpu, 0);
|
|
return 1;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&(vmx->nested.vmcs02_pool));
|
|
vmx->nested.vmcs02_num = 0;
|
|
|
|
vmx->nested.vmxon = true;
|
|
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Intel's VMX Instruction Reference specifies a common set of prerequisites
|
|
* for running VMX instructions (except VMXON, whose prerequisites are
|
|
* slightly different). It also specifies what exception to inject otherwise.
|
|
*/
|
|
static int nested_vmx_check_permission(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_segment cs;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (!vmx->nested.vmxon) {
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 0;
|
|
}
|
|
|
|
vmx_get_segment(vcpu, &cs, VCPU_SREG_CS);
|
|
if ((vmx_get_rflags(vcpu) & X86_EFLAGS_VM) ||
|
|
(is_long_mode(vcpu) && !cs.l)) {
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 0;
|
|
}
|
|
|
|
if (vmx_get_cpl(vcpu)) {
|
|
kvm_inject_gp(vcpu, 0);
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Free whatever needs to be freed from vmx->nested when L1 goes down, or
|
|
* just stops using VMX.
|
|
*/
|
|
static void free_nested(struct vcpu_vmx *vmx)
|
|
{
|
|
if (!vmx->nested.vmxon)
|
|
return;
|
|
vmx->nested.vmxon = false;
|
|
if (vmx->nested.current_vmptr != -1ull) {
|
|
kunmap(vmx->nested.current_vmcs12_page);
|
|
nested_release_page(vmx->nested.current_vmcs12_page);
|
|
vmx->nested.current_vmptr = -1ull;
|
|
vmx->nested.current_vmcs12 = NULL;
|
|
}
|
|
/* Unpin physical memory we referred to in current vmcs02 */
|
|
if (vmx->nested.apic_access_page) {
|
|
nested_release_page(vmx->nested.apic_access_page);
|
|
vmx->nested.apic_access_page = 0;
|
|
}
|
|
|
|
nested_free_all_saved_vmcss(vmx);
|
|
}
|
|
|
|
/* Emulate the VMXOFF instruction */
|
|
static int handle_vmoff(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (!nested_vmx_check_permission(vcpu))
|
|
return 1;
|
|
free_nested(to_vmx(vcpu));
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* Decode the memory-address operand of a vmx instruction, as recorded on an
|
|
* exit caused by such an instruction (run by a guest hypervisor).
|
|
* On success, returns 0. When the operand is invalid, returns 1 and throws
|
|
* #UD or #GP.
|
|
*/
|
|
static int get_vmx_mem_address(struct kvm_vcpu *vcpu,
|
|
unsigned long exit_qualification,
|
|
u32 vmx_instruction_info, gva_t *ret)
|
|
{
|
|
/*
|
|
* According to Vol. 3B, "Information for VM Exits Due to Instruction
|
|
* Execution", on an exit, vmx_instruction_info holds most of the
|
|
* addressing components of the operand. Only the displacement part
|
|
* is put in exit_qualification (see 3B, "Basic VM-Exit Information").
|
|
* For how an actual address is calculated from all these components,
|
|
* refer to Vol. 1, "Operand Addressing".
|
|
*/
|
|
int scaling = vmx_instruction_info & 3;
|
|
int addr_size = (vmx_instruction_info >> 7) & 7;
|
|
bool is_reg = vmx_instruction_info & (1u << 10);
|
|
int seg_reg = (vmx_instruction_info >> 15) & 7;
|
|
int index_reg = (vmx_instruction_info >> 18) & 0xf;
|
|
bool index_is_valid = !(vmx_instruction_info & (1u << 22));
|
|
int base_reg = (vmx_instruction_info >> 23) & 0xf;
|
|
bool base_is_valid = !(vmx_instruction_info & (1u << 27));
|
|
|
|
if (is_reg) {
|
|
kvm_queue_exception(vcpu, UD_VECTOR);
|
|
return 1;
|
|
}
|
|
|
|
/* Addr = segment_base + offset */
|
|
/* offset = base + [index * scale] + displacement */
|
|
*ret = vmx_get_segment_base(vcpu, seg_reg);
|
|
if (base_is_valid)
|
|
*ret += kvm_register_read(vcpu, base_reg);
|
|
if (index_is_valid)
|
|
*ret += kvm_register_read(vcpu, index_reg)<<scaling;
|
|
*ret += exit_qualification; /* holds the displacement */
|
|
|
|
if (addr_size == 1) /* 32 bit */
|
|
*ret &= 0xffffffff;
|
|
|
|
/*
|
|
* TODO: throw #GP (and return 1) in various cases that the VM*
|
|
* instructions require it - e.g., offset beyond segment limit,
|
|
* unusable or unreadable/unwritable segment, non-canonical 64-bit
|
|
* address, and so on. Currently these are not checked.
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The following 3 functions, nested_vmx_succeed()/failValid()/failInvalid(),
|
|
* set the success or error code of an emulated VMX instruction, as specified
|
|
* by Vol 2B, VMX Instruction Reference, "Conventions".
|
|
*/
|
|
static void nested_vmx_succeed(struct kvm_vcpu *vcpu)
|
|
{
|
|
vmx_set_rflags(vcpu, vmx_get_rflags(vcpu)
|
|
& ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
|
|
X86_EFLAGS_ZF | X86_EFLAGS_SF | X86_EFLAGS_OF));
|
|
}
|
|
|
|
static void nested_vmx_failInvalid(struct kvm_vcpu *vcpu)
|
|
{
|
|
vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
|
|
& ~(X86_EFLAGS_PF | X86_EFLAGS_AF | X86_EFLAGS_ZF |
|
|
X86_EFLAGS_SF | X86_EFLAGS_OF))
|
|
| X86_EFLAGS_CF);
|
|
}
|
|
|
|
static void nested_vmx_failValid(struct kvm_vcpu *vcpu,
|
|
u32 vm_instruction_error)
|
|
{
|
|
if (to_vmx(vcpu)->nested.current_vmptr == -1ull) {
|
|
/*
|
|
* failValid writes the error number to the current VMCS, which
|
|
* can't be done there isn't a current VMCS.
|
|
*/
|
|
nested_vmx_failInvalid(vcpu);
|
|
return;
|
|
}
|
|
vmx_set_rflags(vcpu, (vmx_get_rflags(vcpu)
|
|
& ~(X86_EFLAGS_CF | X86_EFLAGS_PF | X86_EFLAGS_AF |
|
|
X86_EFLAGS_SF | X86_EFLAGS_OF))
|
|
| X86_EFLAGS_ZF);
|
|
get_vmcs12(vcpu)->vm_instruction_error = vm_instruction_error;
|
|
}
|
|
|
|
/* Emulate the VMCLEAR instruction */
|
|
static int handle_vmclear(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
gva_t gva;
|
|
gpa_t vmptr;
|
|
struct vmcs12 *vmcs12;
|
|
struct page *page;
|
|
struct x86_exception e;
|
|
|
|
if (!nested_vmx_check_permission(vcpu))
|
|
return 1;
|
|
|
|
if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
|
|
vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
|
|
return 1;
|
|
|
|
if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
|
|
sizeof(vmptr), &e)) {
|
|
kvm_inject_page_fault(vcpu, &e);
|
|
return 1;
|
|
}
|
|
|
|
if (!IS_ALIGNED(vmptr, PAGE_SIZE)) {
|
|
nested_vmx_failValid(vcpu, VMXERR_VMCLEAR_INVALID_ADDRESS);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
if (vmptr == vmx->nested.current_vmptr) {
|
|
kunmap(vmx->nested.current_vmcs12_page);
|
|
nested_release_page(vmx->nested.current_vmcs12_page);
|
|
vmx->nested.current_vmptr = -1ull;
|
|
vmx->nested.current_vmcs12 = NULL;
|
|
}
|
|
|
|
page = nested_get_page(vcpu, vmptr);
|
|
if (page == NULL) {
|
|
/*
|
|
* For accurate processor emulation, VMCLEAR beyond available
|
|
* physical memory should do nothing at all. However, it is
|
|
* possible that a nested vmx bug, not a guest hypervisor bug,
|
|
* resulted in this case, so let's shut down before doing any
|
|
* more damage:
|
|
*/
|
|
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
|
|
return 1;
|
|
}
|
|
vmcs12 = kmap(page);
|
|
vmcs12->launch_state = 0;
|
|
kunmap(page);
|
|
nested_release_page(page);
|
|
|
|
nested_free_vmcs02(vmx, vmptr);
|
|
|
|
skip_emulated_instruction(vcpu);
|
|
nested_vmx_succeed(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch);
|
|
|
|
/* Emulate the VMLAUNCH instruction */
|
|
static int handle_vmlaunch(struct kvm_vcpu *vcpu)
|
|
{
|
|
return nested_vmx_run(vcpu, true);
|
|
}
|
|
|
|
/* Emulate the VMRESUME instruction */
|
|
static int handle_vmresume(struct kvm_vcpu *vcpu)
|
|
{
|
|
|
|
return nested_vmx_run(vcpu, false);
|
|
}
|
|
|
|
enum vmcs_field_type {
|
|
VMCS_FIELD_TYPE_U16 = 0,
|
|
VMCS_FIELD_TYPE_U64 = 1,
|
|
VMCS_FIELD_TYPE_U32 = 2,
|
|
VMCS_FIELD_TYPE_NATURAL_WIDTH = 3
|
|
};
|
|
|
|
static inline int vmcs_field_type(unsigned long field)
|
|
{
|
|
if (0x1 & field) /* the *_HIGH fields are all 32 bit */
|
|
return VMCS_FIELD_TYPE_U32;
|
|
return (field >> 13) & 0x3 ;
|
|
}
|
|
|
|
static inline int vmcs_field_readonly(unsigned long field)
|
|
{
|
|
return (((field >> 10) & 0x3) == 1);
|
|
}
|
|
|
|
/*
|
|
* Read a vmcs12 field. Since these can have varying lengths and we return
|
|
* one type, we chose the biggest type (u64) and zero-extend the return value
|
|
* to that size. Note that the caller, handle_vmread, might need to use only
|
|
* some of the bits we return here (e.g., on 32-bit guests, only 32 bits of
|
|
* 64-bit fields are to be returned).
|
|
*/
|
|
static inline bool vmcs12_read_any(struct kvm_vcpu *vcpu,
|
|
unsigned long field, u64 *ret)
|
|
{
|
|
short offset = vmcs_field_to_offset(field);
|
|
char *p;
|
|
|
|
if (offset < 0)
|
|
return 0;
|
|
|
|
p = ((char *)(get_vmcs12(vcpu))) + offset;
|
|
|
|
switch (vmcs_field_type(field)) {
|
|
case VMCS_FIELD_TYPE_NATURAL_WIDTH:
|
|
*ret = *((natural_width *)p);
|
|
return 1;
|
|
case VMCS_FIELD_TYPE_U16:
|
|
*ret = *((u16 *)p);
|
|
return 1;
|
|
case VMCS_FIELD_TYPE_U32:
|
|
*ret = *((u32 *)p);
|
|
return 1;
|
|
case VMCS_FIELD_TYPE_U64:
|
|
*ret = *((u64 *)p);
|
|
return 1;
|
|
default:
|
|
return 0; /* can never happen. */
|
|
}
|
|
}
|
|
|
|
/*
|
|
* VMX instructions which assume a current vmcs12 (i.e., that VMPTRLD was
|
|
* used before) all generate the same failure when it is missing.
|
|
*/
|
|
static int nested_vmx_check_vmcs12(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
if (vmx->nested.current_vmptr == -1ull) {
|
|
nested_vmx_failInvalid(vcpu);
|
|
skip_emulated_instruction(vcpu);
|
|
return 0;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static int handle_vmread(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long field;
|
|
u64 field_value;
|
|
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
|
|
gva_t gva = 0;
|
|
|
|
if (!nested_vmx_check_permission(vcpu) ||
|
|
!nested_vmx_check_vmcs12(vcpu))
|
|
return 1;
|
|
|
|
/* Decode instruction info and find the field to read */
|
|
field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
|
|
/* Read the field, zero-extended to a u64 field_value */
|
|
if (!vmcs12_read_any(vcpu, field, &field_value)) {
|
|
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
/*
|
|
* Now copy part of this value to register or memory, as requested.
|
|
* Note that the number of bits actually copied is 32 or 64 depending
|
|
* on the guest's mode (32 or 64 bit), not on the given field's length.
|
|
*/
|
|
if (vmx_instruction_info & (1u << 10)) {
|
|
kvm_register_write(vcpu, (((vmx_instruction_info) >> 3) & 0xf),
|
|
field_value);
|
|
} else {
|
|
if (get_vmx_mem_address(vcpu, exit_qualification,
|
|
vmx_instruction_info, &gva))
|
|
return 1;
|
|
/* _system ok, as nested_vmx_check_permission verified cpl=0 */
|
|
kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, gva,
|
|
&field_value, (is_long_mode(vcpu) ? 8 : 4), NULL);
|
|
}
|
|
|
|
nested_vmx_succeed(vcpu);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int handle_vmwrite(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long field;
|
|
gva_t gva;
|
|
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
|
|
char *p;
|
|
short offset;
|
|
/* The value to write might be 32 or 64 bits, depending on L1's long
|
|
* mode, and eventually we need to write that into a field of several
|
|
* possible lengths. The code below first zero-extends the value to 64
|
|
* bit (field_value), and then copies only the approriate number of
|
|
* bits into the vmcs12 field.
|
|
*/
|
|
u64 field_value = 0;
|
|
struct x86_exception e;
|
|
|
|
if (!nested_vmx_check_permission(vcpu) ||
|
|
!nested_vmx_check_vmcs12(vcpu))
|
|
return 1;
|
|
|
|
if (vmx_instruction_info & (1u << 10))
|
|
field_value = kvm_register_read(vcpu,
|
|
(((vmx_instruction_info) >> 3) & 0xf));
|
|
else {
|
|
if (get_vmx_mem_address(vcpu, exit_qualification,
|
|
vmx_instruction_info, &gva))
|
|
return 1;
|
|
if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva,
|
|
&field_value, (is_long_mode(vcpu) ? 8 : 4), &e)) {
|
|
kvm_inject_page_fault(vcpu, &e);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
|
|
field = kvm_register_read(vcpu, (((vmx_instruction_info) >> 28) & 0xf));
|
|
if (vmcs_field_readonly(field)) {
|
|
nested_vmx_failValid(vcpu,
|
|
VMXERR_VMWRITE_READ_ONLY_VMCS_COMPONENT);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
offset = vmcs_field_to_offset(field);
|
|
if (offset < 0) {
|
|
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
p = ((char *) get_vmcs12(vcpu)) + offset;
|
|
|
|
switch (vmcs_field_type(field)) {
|
|
case VMCS_FIELD_TYPE_U16:
|
|
*(u16 *)p = field_value;
|
|
break;
|
|
case VMCS_FIELD_TYPE_U32:
|
|
*(u32 *)p = field_value;
|
|
break;
|
|
case VMCS_FIELD_TYPE_U64:
|
|
*(u64 *)p = field_value;
|
|
break;
|
|
case VMCS_FIELD_TYPE_NATURAL_WIDTH:
|
|
*(natural_width *)p = field_value;
|
|
break;
|
|
default:
|
|
nested_vmx_failValid(vcpu, VMXERR_UNSUPPORTED_VMCS_COMPONENT);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
nested_vmx_succeed(vcpu);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
/* Emulate the VMPTRLD instruction */
|
|
static int handle_vmptrld(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
gva_t gva;
|
|
gpa_t vmptr;
|
|
struct x86_exception e;
|
|
|
|
if (!nested_vmx_check_permission(vcpu))
|
|
return 1;
|
|
|
|
if (get_vmx_mem_address(vcpu, vmcs_readl(EXIT_QUALIFICATION),
|
|
vmcs_read32(VMX_INSTRUCTION_INFO), &gva))
|
|
return 1;
|
|
|
|
if (kvm_read_guest_virt(&vcpu->arch.emulate_ctxt, gva, &vmptr,
|
|
sizeof(vmptr), &e)) {
|
|
kvm_inject_page_fault(vcpu, &e);
|
|
return 1;
|
|
}
|
|
|
|
if (!IS_ALIGNED(vmptr, PAGE_SIZE)) {
|
|
nested_vmx_failValid(vcpu, VMXERR_VMPTRLD_INVALID_ADDRESS);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
if (vmx->nested.current_vmptr != vmptr) {
|
|
struct vmcs12 *new_vmcs12;
|
|
struct page *page;
|
|
page = nested_get_page(vcpu, vmptr);
|
|
if (page == NULL) {
|
|
nested_vmx_failInvalid(vcpu);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
new_vmcs12 = kmap(page);
|
|
if (new_vmcs12->revision_id != VMCS12_REVISION) {
|
|
kunmap(page);
|
|
nested_release_page_clean(page);
|
|
nested_vmx_failValid(vcpu,
|
|
VMXERR_VMPTRLD_INCORRECT_VMCS_REVISION_ID);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
if (vmx->nested.current_vmptr != -1ull) {
|
|
kunmap(vmx->nested.current_vmcs12_page);
|
|
nested_release_page(vmx->nested.current_vmcs12_page);
|
|
}
|
|
|
|
vmx->nested.current_vmptr = vmptr;
|
|
vmx->nested.current_vmcs12 = new_vmcs12;
|
|
vmx->nested.current_vmcs12_page = page;
|
|
}
|
|
|
|
nested_vmx_succeed(vcpu);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
/* Emulate the VMPTRST instruction */
|
|
static int handle_vmptrst(struct kvm_vcpu *vcpu)
|
|
{
|
|
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
u32 vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
|
|
gva_t vmcs_gva;
|
|
struct x86_exception e;
|
|
|
|
if (!nested_vmx_check_permission(vcpu))
|
|
return 1;
|
|
|
|
if (get_vmx_mem_address(vcpu, exit_qualification,
|
|
vmx_instruction_info, &vmcs_gva))
|
|
return 1;
|
|
/* ok to use *_system, as nested_vmx_check_permission verified cpl=0 */
|
|
if (kvm_write_guest_virt_system(&vcpu->arch.emulate_ctxt, vmcs_gva,
|
|
(void *)&to_vmx(vcpu)->nested.current_vmptr,
|
|
sizeof(u64), &e)) {
|
|
kvm_inject_page_fault(vcpu, &e);
|
|
return 1;
|
|
}
|
|
nested_vmx_succeed(vcpu);
|
|
skip_emulated_instruction(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* The exit handlers return 1 if the exit was handled fully and guest execution
|
|
* may resume. Otherwise they set the kvm_run parameter to indicate what needs
|
|
* to be done to userspace and return 0.
|
|
*/
|
|
static int (*kvm_vmx_exit_handlers[])(struct kvm_vcpu *vcpu) = {
|
|
[EXIT_REASON_EXCEPTION_NMI] = handle_exception,
|
|
[EXIT_REASON_EXTERNAL_INTERRUPT] = handle_external_interrupt,
|
|
[EXIT_REASON_TRIPLE_FAULT] = handle_triple_fault,
|
|
[EXIT_REASON_NMI_WINDOW] = handle_nmi_window,
|
|
[EXIT_REASON_IO_INSTRUCTION] = handle_io,
|
|
[EXIT_REASON_CR_ACCESS] = handle_cr,
|
|
[EXIT_REASON_DR_ACCESS] = handle_dr,
|
|
[EXIT_REASON_CPUID] = handle_cpuid,
|
|
[EXIT_REASON_MSR_READ] = handle_rdmsr,
|
|
[EXIT_REASON_MSR_WRITE] = handle_wrmsr,
|
|
[EXIT_REASON_PENDING_INTERRUPT] = handle_interrupt_window,
|
|
[EXIT_REASON_HLT] = handle_halt,
|
|
[EXIT_REASON_INVD] = handle_invd,
|
|
[EXIT_REASON_INVLPG] = handle_invlpg,
|
|
[EXIT_REASON_VMCALL] = handle_vmcall,
|
|
[EXIT_REASON_VMCLEAR] = handle_vmclear,
|
|
[EXIT_REASON_VMLAUNCH] = handle_vmlaunch,
|
|
[EXIT_REASON_VMPTRLD] = handle_vmptrld,
|
|
[EXIT_REASON_VMPTRST] = handle_vmptrst,
|
|
[EXIT_REASON_VMREAD] = handle_vmread,
|
|
[EXIT_REASON_VMRESUME] = handle_vmresume,
|
|
[EXIT_REASON_VMWRITE] = handle_vmwrite,
|
|
[EXIT_REASON_VMOFF] = handle_vmoff,
|
|
[EXIT_REASON_VMON] = handle_vmon,
|
|
[EXIT_REASON_TPR_BELOW_THRESHOLD] = handle_tpr_below_threshold,
|
|
[EXIT_REASON_APIC_ACCESS] = handle_apic_access,
|
|
[EXIT_REASON_WBINVD] = handle_wbinvd,
|
|
[EXIT_REASON_XSETBV] = handle_xsetbv,
|
|
[EXIT_REASON_TASK_SWITCH] = handle_task_switch,
|
|
[EXIT_REASON_MCE_DURING_VMENTRY] = handle_machine_check,
|
|
[EXIT_REASON_EPT_VIOLATION] = handle_ept_violation,
|
|
[EXIT_REASON_EPT_MISCONFIG] = handle_ept_misconfig,
|
|
[EXIT_REASON_PAUSE_INSTRUCTION] = handle_pause,
|
|
[EXIT_REASON_MWAIT_INSTRUCTION] = handle_invalid_op,
|
|
[EXIT_REASON_MONITOR_INSTRUCTION] = handle_invalid_op,
|
|
};
|
|
|
|
static const int kvm_vmx_max_exit_handlers =
|
|
ARRAY_SIZE(kvm_vmx_exit_handlers);
|
|
|
|
/*
|
|
* Return 1 if we should exit from L2 to L1 to handle an MSR access access,
|
|
* rather than handle it ourselves in L0. I.e., check whether L1 expressed
|
|
* disinterest in the current event (read or write a specific MSR) by using an
|
|
* MSR bitmap. This may be the case even when L0 doesn't use MSR bitmaps.
|
|
*/
|
|
static bool nested_vmx_exit_handled_msr(struct kvm_vcpu *vcpu,
|
|
struct vmcs12 *vmcs12, u32 exit_reason)
|
|
{
|
|
u32 msr_index = vcpu->arch.regs[VCPU_REGS_RCX];
|
|
gpa_t bitmap;
|
|
|
|
if (!nested_cpu_has(get_vmcs12(vcpu), CPU_BASED_USE_MSR_BITMAPS))
|
|
return 1;
|
|
|
|
/*
|
|
* The MSR_BITMAP page is divided into four 1024-byte bitmaps,
|
|
* for the four combinations of read/write and low/high MSR numbers.
|
|
* First we need to figure out which of the four to use:
|
|
*/
|
|
bitmap = vmcs12->msr_bitmap;
|
|
if (exit_reason == EXIT_REASON_MSR_WRITE)
|
|
bitmap += 2048;
|
|
if (msr_index >= 0xc0000000) {
|
|
msr_index -= 0xc0000000;
|
|
bitmap += 1024;
|
|
}
|
|
|
|
/* Then read the msr_index'th bit from this bitmap: */
|
|
if (msr_index < 1024*8) {
|
|
unsigned char b;
|
|
kvm_read_guest(vcpu->kvm, bitmap + msr_index/8, &b, 1);
|
|
return 1 & (b >> (msr_index & 7));
|
|
} else
|
|
return 1; /* let L1 handle the wrong parameter */
|
|
}
|
|
|
|
/*
|
|
* Return 1 if we should exit from L2 to L1 to handle a CR access exit,
|
|
* rather than handle it ourselves in L0. I.e., check if L1 wanted to
|
|
* intercept (via guest_host_mask etc.) the current event.
|
|
*/
|
|
static bool nested_vmx_exit_handled_cr(struct kvm_vcpu *vcpu,
|
|
struct vmcs12 *vmcs12)
|
|
{
|
|
unsigned long exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
int cr = exit_qualification & 15;
|
|
int reg = (exit_qualification >> 8) & 15;
|
|
unsigned long val = kvm_register_read(vcpu, reg);
|
|
|
|
switch ((exit_qualification >> 4) & 3) {
|
|
case 0: /* mov to cr */
|
|
switch (cr) {
|
|
case 0:
|
|
if (vmcs12->cr0_guest_host_mask &
|
|
(val ^ vmcs12->cr0_read_shadow))
|
|
return 1;
|
|
break;
|
|
case 3:
|
|
if ((vmcs12->cr3_target_count >= 1 &&
|
|
vmcs12->cr3_target_value0 == val) ||
|
|
(vmcs12->cr3_target_count >= 2 &&
|
|
vmcs12->cr3_target_value1 == val) ||
|
|
(vmcs12->cr3_target_count >= 3 &&
|
|
vmcs12->cr3_target_value2 == val) ||
|
|
(vmcs12->cr3_target_count >= 4 &&
|
|
vmcs12->cr3_target_value3 == val))
|
|
return 0;
|
|
if (nested_cpu_has(vmcs12, CPU_BASED_CR3_LOAD_EXITING))
|
|
return 1;
|
|
break;
|
|
case 4:
|
|
if (vmcs12->cr4_guest_host_mask &
|
|
(vmcs12->cr4_read_shadow ^ val))
|
|
return 1;
|
|
break;
|
|
case 8:
|
|
if (nested_cpu_has(vmcs12, CPU_BASED_CR8_LOAD_EXITING))
|
|
return 1;
|
|
break;
|
|
}
|
|
break;
|
|
case 2: /* clts */
|
|
if ((vmcs12->cr0_guest_host_mask & X86_CR0_TS) &&
|
|
(vmcs12->cr0_read_shadow & X86_CR0_TS))
|
|
return 1;
|
|
break;
|
|
case 1: /* mov from cr */
|
|
switch (cr) {
|
|
case 3:
|
|
if (vmcs12->cpu_based_vm_exec_control &
|
|
CPU_BASED_CR3_STORE_EXITING)
|
|
return 1;
|
|
break;
|
|
case 8:
|
|
if (vmcs12->cpu_based_vm_exec_control &
|
|
CPU_BASED_CR8_STORE_EXITING)
|
|
return 1;
|
|
break;
|
|
}
|
|
break;
|
|
case 3: /* lmsw */
|
|
/*
|
|
* lmsw can change bits 1..3 of cr0, and only set bit 0 of
|
|
* cr0. Other attempted changes are ignored, with no exit.
|
|
*/
|
|
if (vmcs12->cr0_guest_host_mask & 0xe &
|
|
(val ^ vmcs12->cr0_read_shadow))
|
|
return 1;
|
|
if ((vmcs12->cr0_guest_host_mask & 0x1) &&
|
|
!(vmcs12->cr0_read_shadow & 0x1) &&
|
|
(val & 0x1))
|
|
return 1;
|
|
break;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Return 1 if we should exit from L2 to L1 to handle an exit, or 0 if we
|
|
* should handle it ourselves in L0 (and then continue L2). Only call this
|
|
* when in is_guest_mode (L2).
|
|
*/
|
|
static bool nested_vmx_exit_handled(struct kvm_vcpu *vcpu)
|
|
{
|
|
u32 exit_reason = vmcs_read32(VM_EXIT_REASON);
|
|
u32 intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
|
|
|
|
if (vmx->nested.nested_run_pending)
|
|
return 0;
|
|
|
|
if (unlikely(vmx->fail)) {
|
|
pr_info_ratelimited("%s failed vm entry %x\n", __func__,
|
|
vmcs_read32(VM_INSTRUCTION_ERROR));
|
|
return 1;
|
|
}
|
|
|
|
switch (exit_reason) {
|
|
case EXIT_REASON_EXCEPTION_NMI:
|
|
if (!is_exception(intr_info))
|
|
return 0;
|
|
else if (is_page_fault(intr_info))
|
|
return enable_ept;
|
|
return vmcs12->exception_bitmap &
|
|
(1u << (intr_info & INTR_INFO_VECTOR_MASK));
|
|
case EXIT_REASON_EXTERNAL_INTERRUPT:
|
|
return 0;
|
|
case EXIT_REASON_TRIPLE_FAULT:
|
|
return 1;
|
|
case EXIT_REASON_PENDING_INTERRUPT:
|
|
case EXIT_REASON_NMI_WINDOW:
|
|
/*
|
|
* prepare_vmcs02() set the CPU_BASED_VIRTUAL_INTR_PENDING bit
|
|
* (aka Interrupt Window Exiting) only when L1 turned it on,
|
|
* so if we got a PENDING_INTERRUPT exit, this must be for L1.
|
|
* Same for NMI Window Exiting.
|
|
*/
|
|
return 1;
|
|
case EXIT_REASON_TASK_SWITCH:
|
|
return 1;
|
|
case EXIT_REASON_CPUID:
|
|
return 1;
|
|
case EXIT_REASON_HLT:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_HLT_EXITING);
|
|
case EXIT_REASON_INVD:
|
|
return 1;
|
|
case EXIT_REASON_INVLPG:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_INVLPG_EXITING);
|
|
case EXIT_REASON_RDPMC:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_RDPMC_EXITING);
|
|
case EXIT_REASON_RDTSC:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_RDTSC_EXITING);
|
|
case EXIT_REASON_VMCALL: case EXIT_REASON_VMCLEAR:
|
|
case EXIT_REASON_VMLAUNCH: case EXIT_REASON_VMPTRLD:
|
|
case EXIT_REASON_VMPTRST: case EXIT_REASON_VMREAD:
|
|
case EXIT_REASON_VMRESUME: case EXIT_REASON_VMWRITE:
|
|
case EXIT_REASON_VMOFF: case EXIT_REASON_VMON:
|
|
/*
|
|
* VMX instructions trap unconditionally. This allows L1 to
|
|
* emulate them for its L2 guest, i.e., allows 3-level nesting!
|
|
*/
|
|
return 1;
|
|
case EXIT_REASON_CR_ACCESS:
|
|
return nested_vmx_exit_handled_cr(vcpu, vmcs12);
|
|
case EXIT_REASON_DR_ACCESS:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_MOV_DR_EXITING);
|
|
case EXIT_REASON_IO_INSTRUCTION:
|
|
/* TODO: support IO bitmaps */
|
|
return 1;
|
|
case EXIT_REASON_MSR_READ:
|
|
case EXIT_REASON_MSR_WRITE:
|
|
return nested_vmx_exit_handled_msr(vcpu, vmcs12, exit_reason);
|
|
case EXIT_REASON_INVALID_STATE:
|
|
return 1;
|
|
case EXIT_REASON_MWAIT_INSTRUCTION:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_MWAIT_EXITING);
|
|
case EXIT_REASON_MONITOR_INSTRUCTION:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_MONITOR_EXITING);
|
|
case EXIT_REASON_PAUSE_INSTRUCTION:
|
|
return nested_cpu_has(vmcs12, CPU_BASED_PAUSE_EXITING) ||
|
|
nested_cpu_has2(vmcs12,
|
|
SECONDARY_EXEC_PAUSE_LOOP_EXITING);
|
|
case EXIT_REASON_MCE_DURING_VMENTRY:
|
|
return 0;
|
|
case EXIT_REASON_TPR_BELOW_THRESHOLD:
|
|
return 1;
|
|
case EXIT_REASON_APIC_ACCESS:
|
|
return nested_cpu_has2(vmcs12,
|
|
SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES);
|
|
case EXIT_REASON_EPT_VIOLATION:
|
|
case EXIT_REASON_EPT_MISCONFIG:
|
|
return 0;
|
|
case EXIT_REASON_WBINVD:
|
|
return nested_cpu_has2(vmcs12, SECONDARY_EXEC_WBINVD_EXITING);
|
|
case EXIT_REASON_XSETBV:
|
|
return 1;
|
|
default:
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
static void vmx_get_exit_info(struct kvm_vcpu *vcpu, u64 *info1, u64 *info2)
|
|
{
|
|
*info1 = vmcs_readl(EXIT_QUALIFICATION);
|
|
*info2 = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
}
|
|
|
|
/*
|
|
* The guest has exited. See if we can fix it or if we need userspace
|
|
* assistance.
|
|
*/
|
|
static int vmx_handle_exit(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 exit_reason = vmx->exit_reason;
|
|
u32 vectoring_info = vmx->idt_vectoring_info;
|
|
|
|
/* If guest state is invalid, start emulating */
|
|
if (vmx->emulation_required && emulate_invalid_guest_state)
|
|
return handle_invalid_guest_state(vcpu);
|
|
|
|
/*
|
|
* the KVM_REQ_EVENT optimization bit is only on for one entry, and if
|
|
* we did not inject a still-pending event to L1 now because of
|
|
* nested_run_pending, we need to re-enable this bit.
|
|
*/
|
|
if (vmx->nested.nested_run_pending)
|
|
kvm_make_request(KVM_REQ_EVENT, vcpu);
|
|
|
|
if (!is_guest_mode(vcpu) && (exit_reason == EXIT_REASON_VMLAUNCH ||
|
|
exit_reason == EXIT_REASON_VMRESUME))
|
|
vmx->nested.nested_run_pending = 1;
|
|
else
|
|
vmx->nested.nested_run_pending = 0;
|
|
|
|
if (is_guest_mode(vcpu) && nested_vmx_exit_handled(vcpu)) {
|
|
nested_vmx_vmexit(vcpu);
|
|
return 1;
|
|
}
|
|
|
|
if (exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY) {
|
|
vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
|
|
vcpu->run->fail_entry.hardware_entry_failure_reason
|
|
= exit_reason;
|
|
return 0;
|
|
}
|
|
|
|
if (unlikely(vmx->fail)) {
|
|
vcpu->run->exit_reason = KVM_EXIT_FAIL_ENTRY;
|
|
vcpu->run->fail_entry.hardware_entry_failure_reason
|
|
= vmcs_read32(VM_INSTRUCTION_ERROR);
|
|
return 0;
|
|
}
|
|
|
|
if ((vectoring_info & VECTORING_INFO_VALID_MASK) &&
|
|
(exit_reason != EXIT_REASON_EXCEPTION_NMI &&
|
|
exit_reason != EXIT_REASON_EPT_VIOLATION &&
|
|
exit_reason != EXIT_REASON_TASK_SWITCH))
|
|
printk(KERN_WARNING "%s: unexpected, valid vectoring info "
|
|
"(0x%x) and exit reason is 0x%x\n",
|
|
__func__, vectoring_info, exit_reason);
|
|
|
|
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked &&
|
|
!(is_guest_mode(vcpu) && nested_cpu_has_virtual_nmis(
|
|
get_vmcs12(vcpu), vcpu)))) {
|
|
if (vmx_interrupt_allowed(vcpu)) {
|
|
vmx->soft_vnmi_blocked = 0;
|
|
} else if (vmx->vnmi_blocked_time > 1000000000LL &&
|
|
vcpu->arch.nmi_pending) {
|
|
/*
|
|
* This CPU don't support us in finding the end of an
|
|
* NMI-blocked window if the guest runs with IRQs
|
|
* disabled. So we pull the trigger after 1 s of
|
|
* futile waiting, but inform the user about this.
|
|
*/
|
|
printk(KERN_WARNING "%s: Breaking out of NMI-blocked "
|
|
"state on VCPU %d after 1 s timeout\n",
|
|
__func__, vcpu->vcpu_id);
|
|
vmx->soft_vnmi_blocked = 0;
|
|
}
|
|
}
|
|
|
|
if (exit_reason < kvm_vmx_max_exit_handlers
|
|
&& kvm_vmx_exit_handlers[exit_reason])
|
|
return kvm_vmx_exit_handlers[exit_reason](vcpu);
|
|
else {
|
|
vcpu->run->exit_reason = KVM_EXIT_UNKNOWN;
|
|
vcpu->run->hw.hardware_exit_reason = exit_reason;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void update_cr8_intercept(struct kvm_vcpu *vcpu, int tpr, int irr)
|
|
{
|
|
if (irr == -1 || tpr < irr) {
|
|
vmcs_write32(TPR_THRESHOLD, 0);
|
|
return;
|
|
}
|
|
|
|
vmcs_write32(TPR_THRESHOLD, irr);
|
|
}
|
|
|
|
static void vmx_complete_atomic_exit(struct vcpu_vmx *vmx)
|
|
{
|
|
u32 exit_intr_info;
|
|
|
|
if (!(vmx->exit_reason == EXIT_REASON_MCE_DURING_VMENTRY
|
|
|| vmx->exit_reason == EXIT_REASON_EXCEPTION_NMI))
|
|
return;
|
|
|
|
vmx->exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
exit_intr_info = vmx->exit_intr_info;
|
|
|
|
/* Handle machine checks before interrupts are enabled */
|
|
if (is_machine_check(exit_intr_info))
|
|
kvm_machine_check();
|
|
|
|
/* We need to handle NMIs before interrupts are enabled */
|
|
if ((exit_intr_info & INTR_INFO_INTR_TYPE_MASK) == INTR_TYPE_NMI_INTR &&
|
|
(exit_intr_info & INTR_INFO_VALID_MASK)) {
|
|
kvm_before_handle_nmi(&vmx->vcpu);
|
|
asm("int $2");
|
|
kvm_after_handle_nmi(&vmx->vcpu);
|
|
}
|
|
}
|
|
|
|
static void vmx_recover_nmi_blocking(struct vcpu_vmx *vmx)
|
|
{
|
|
u32 exit_intr_info;
|
|
bool unblock_nmi;
|
|
u8 vector;
|
|
bool idtv_info_valid;
|
|
|
|
idtv_info_valid = vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK;
|
|
|
|
if (cpu_has_virtual_nmis()) {
|
|
if (vmx->nmi_known_unmasked)
|
|
return;
|
|
/*
|
|
* Can't use vmx->exit_intr_info since we're not sure what
|
|
* the exit reason is.
|
|
*/
|
|
exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
unblock_nmi = (exit_intr_info & INTR_INFO_UNBLOCK_NMI) != 0;
|
|
vector = exit_intr_info & INTR_INFO_VECTOR_MASK;
|
|
/*
|
|
* SDM 3: 27.7.1.2 (September 2008)
|
|
* Re-set bit "block by NMI" before VM entry if vmexit caused by
|
|
* a guest IRET fault.
|
|
* SDM 3: 23.2.2 (September 2008)
|
|
* Bit 12 is undefined in any of the following cases:
|
|
* If the VM exit sets the valid bit in the IDT-vectoring
|
|
* information field.
|
|
* If the VM exit is due to a double fault.
|
|
*/
|
|
if ((exit_intr_info & INTR_INFO_VALID_MASK) && unblock_nmi &&
|
|
vector != DF_VECTOR && !idtv_info_valid)
|
|
vmcs_set_bits(GUEST_INTERRUPTIBILITY_INFO,
|
|
GUEST_INTR_STATE_NMI);
|
|
else
|
|
vmx->nmi_known_unmasked =
|
|
!(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO)
|
|
& GUEST_INTR_STATE_NMI);
|
|
} else if (unlikely(vmx->soft_vnmi_blocked))
|
|
vmx->vnmi_blocked_time +=
|
|
ktime_to_ns(ktime_sub(ktime_get(), vmx->entry_time));
|
|
}
|
|
|
|
static void __vmx_complete_interrupts(struct vcpu_vmx *vmx,
|
|
u32 idt_vectoring_info,
|
|
int instr_len_field,
|
|
int error_code_field)
|
|
{
|
|
u8 vector;
|
|
int type;
|
|
bool idtv_info_valid;
|
|
|
|
idtv_info_valid = idt_vectoring_info & VECTORING_INFO_VALID_MASK;
|
|
|
|
vmx->vcpu.arch.nmi_injected = false;
|
|
kvm_clear_exception_queue(&vmx->vcpu);
|
|
kvm_clear_interrupt_queue(&vmx->vcpu);
|
|
|
|
if (!idtv_info_valid)
|
|
return;
|
|
|
|
kvm_make_request(KVM_REQ_EVENT, &vmx->vcpu);
|
|
|
|
vector = idt_vectoring_info & VECTORING_INFO_VECTOR_MASK;
|
|
type = idt_vectoring_info & VECTORING_INFO_TYPE_MASK;
|
|
|
|
switch (type) {
|
|
case INTR_TYPE_NMI_INTR:
|
|
vmx->vcpu.arch.nmi_injected = true;
|
|
/*
|
|
* SDM 3: 27.7.1.2 (September 2008)
|
|
* Clear bit "block by NMI" before VM entry if a NMI
|
|
* delivery faulted.
|
|
*/
|
|
vmx_set_nmi_mask(&vmx->vcpu, false);
|
|
break;
|
|
case INTR_TYPE_SOFT_EXCEPTION:
|
|
vmx->vcpu.arch.event_exit_inst_len =
|
|
vmcs_read32(instr_len_field);
|
|
/* fall through */
|
|
case INTR_TYPE_HARD_EXCEPTION:
|
|
if (idt_vectoring_info & VECTORING_INFO_DELIVER_CODE_MASK) {
|
|
u32 err = vmcs_read32(error_code_field);
|
|
kvm_queue_exception_e(&vmx->vcpu, vector, err);
|
|
} else
|
|
kvm_queue_exception(&vmx->vcpu, vector);
|
|
break;
|
|
case INTR_TYPE_SOFT_INTR:
|
|
vmx->vcpu.arch.event_exit_inst_len =
|
|
vmcs_read32(instr_len_field);
|
|
/* fall through */
|
|
case INTR_TYPE_EXT_INTR:
|
|
kvm_queue_interrupt(&vmx->vcpu, vector,
|
|
type == INTR_TYPE_SOFT_INTR);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void vmx_complete_interrupts(struct vcpu_vmx *vmx)
|
|
{
|
|
if (is_guest_mode(&vmx->vcpu))
|
|
return;
|
|
__vmx_complete_interrupts(vmx, vmx->idt_vectoring_info,
|
|
VM_EXIT_INSTRUCTION_LEN,
|
|
IDT_VECTORING_ERROR_CODE);
|
|
}
|
|
|
|
static void vmx_cancel_injection(struct kvm_vcpu *vcpu)
|
|
{
|
|
if (is_guest_mode(vcpu))
|
|
return;
|
|
__vmx_complete_interrupts(to_vmx(vcpu),
|
|
vmcs_read32(VM_ENTRY_INTR_INFO_FIELD),
|
|
VM_ENTRY_INSTRUCTION_LEN,
|
|
VM_ENTRY_EXCEPTION_ERROR_CODE);
|
|
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD, 0);
|
|
}
|
|
|
|
static void atomic_switch_perf_msrs(struct vcpu_vmx *vmx)
|
|
{
|
|
int i, nr_msrs;
|
|
struct perf_guest_switch_msr *msrs;
|
|
|
|
msrs = perf_guest_get_msrs(&nr_msrs);
|
|
|
|
if (!msrs)
|
|
return;
|
|
|
|
for (i = 0; i < nr_msrs; i++)
|
|
if (msrs[i].host == msrs[i].guest)
|
|
clear_atomic_switch_msr(vmx, msrs[i].msr);
|
|
else
|
|
add_atomic_switch_msr(vmx, msrs[i].msr, msrs[i].guest,
|
|
msrs[i].host);
|
|
}
|
|
|
|
#ifdef CONFIG_X86_64
|
|
#define R "r"
|
|
#define Q "q"
|
|
#else
|
|
#define R "e"
|
|
#define Q "l"
|
|
#endif
|
|
|
|
static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
if (is_guest_mode(vcpu) && !vmx->nested.nested_run_pending) {
|
|
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
|
|
if (vmcs12->idt_vectoring_info_field &
|
|
VECTORING_INFO_VALID_MASK) {
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
|
|
vmcs12->idt_vectoring_info_field);
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
|
|
vmcs12->vm_exit_instruction_len);
|
|
if (vmcs12->idt_vectoring_info_field &
|
|
VECTORING_INFO_DELIVER_CODE_MASK)
|
|
vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
|
|
vmcs12->idt_vectoring_error_code);
|
|
}
|
|
}
|
|
|
|
/* Record the guest's net vcpu time for enforced NMI injections. */
|
|
if (unlikely(!cpu_has_virtual_nmis() && vmx->soft_vnmi_blocked))
|
|
vmx->entry_time = ktime_get();
|
|
|
|
/* Don't enter VMX if guest state is invalid, let the exit handler
|
|
start emulation until we arrive back to a valid state */
|
|
if (vmx->emulation_required && emulate_invalid_guest_state)
|
|
return;
|
|
|
|
if (test_bit(VCPU_REGS_RSP, (unsigned long *)&vcpu->arch.regs_dirty))
|
|
vmcs_writel(GUEST_RSP, vcpu->arch.regs[VCPU_REGS_RSP]);
|
|
if (test_bit(VCPU_REGS_RIP, (unsigned long *)&vcpu->arch.regs_dirty))
|
|
vmcs_writel(GUEST_RIP, vcpu->arch.regs[VCPU_REGS_RIP]);
|
|
|
|
/* When single-stepping over STI and MOV SS, we must clear the
|
|
* corresponding interruptibility bits in the guest state. Otherwise
|
|
* vmentry fails as it then expects bit 14 (BS) in pending debug
|
|
* exceptions being set, but that's not correct for the guest debugging
|
|
* case. */
|
|
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
|
|
vmx_set_interrupt_shadow(vcpu, 0);
|
|
|
|
atomic_switch_perf_msrs(vmx);
|
|
|
|
vmx->__launched = vmx->loaded_vmcs->launched;
|
|
asm(
|
|
/* Store host registers */
|
|
"push %%"R"dx; push %%"R"bp;"
|
|
"push %%"R"cx \n\t" /* placeholder for guest rcx */
|
|
"push %%"R"cx \n\t"
|
|
"cmp %%"R"sp, %c[host_rsp](%0) \n\t"
|
|
"je 1f \n\t"
|
|
"mov %%"R"sp, %c[host_rsp](%0) \n\t"
|
|
__ex(ASM_VMX_VMWRITE_RSP_RDX) "\n\t"
|
|
"1: \n\t"
|
|
/* Reload cr2 if changed */
|
|
"mov %c[cr2](%0), %%"R"ax \n\t"
|
|
"mov %%cr2, %%"R"dx \n\t"
|
|
"cmp %%"R"ax, %%"R"dx \n\t"
|
|
"je 2f \n\t"
|
|
"mov %%"R"ax, %%cr2 \n\t"
|
|
"2: \n\t"
|
|
/* Check if vmlaunch of vmresume is needed */
|
|
"cmpl $0, %c[launched](%0) \n\t"
|
|
/* Load guest registers. Don't clobber flags. */
|
|
"mov %c[rax](%0), %%"R"ax \n\t"
|
|
"mov %c[rbx](%0), %%"R"bx \n\t"
|
|
"mov %c[rdx](%0), %%"R"dx \n\t"
|
|
"mov %c[rsi](%0), %%"R"si \n\t"
|
|
"mov %c[rdi](%0), %%"R"di \n\t"
|
|
"mov %c[rbp](%0), %%"R"bp \n\t"
|
|
#ifdef CONFIG_X86_64
|
|
"mov %c[r8](%0), %%r8 \n\t"
|
|
"mov %c[r9](%0), %%r9 \n\t"
|
|
"mov %c[r10](%0), %%r10 \n\t"
|
|
"mov %c[r11](%0), %%r11 \n\t"
|
|
"mov %c[r12](%0), %%r12 \n\t"
|
|
"mov %c[r13](%0), %%r13 \n\t"
|
|
"mov %c[r14](%0), %%r14 \n\t"
|
|
"mov %c[r15](%0), %%r15 \n\t"
|
|
#endif
|
|
"mov %c[rcx](%0), %%"R"cx \n\t" /* kills %0 (ecx) */
|
|
|
|
/* Enter guest mode */
|
|
"jne .Llaunched \n\t"
|
|
__ex(ASM_VMX_VMLAUNCH) "\n\t"
|
|
"jmp .Lkvm_vmx_return \n\t"
|
|
".Llaunched: " __ex(ASM_VMX_VMRESUME) "\n\t"
|
|
".Lkvm_vmx_return: "
|
|
/* Save guest registers, load host registers, keep flags */
|
|
"mov %0, %c[wordsize](%%"R"sp) \n\t"
|
|
"pop %0 \n\t"
|
|
"mov %%"R"ax, %c[rax](%0) \n\t"
|
|
"mov %%"R"bx, %c[rbx](%0) \n\t"
|
|
"pop"Q" %c[rcx](%0) \n\t"
|
|
"mov %%"R"dx, %c[rdx](%0) \n\t"
|
|
"mov %%"R"si, %c[rsi](%0) \n\t"
|
|
"mov %%"R"di, %c[rdi](%0) \n\t"
|
|
"mov %%"R"bp, %c[rbp](%0) \n\t"
|
|
#ifdef CONFIG_X86_64
|
|
"mov %%r8, %c[r8](%0) \n\t"
|
|
"mov %%r9, %c[r9](%0) \n\t"
|
|
"mov %%r10, %c[r10](%0) \n\t"
|
|
"mov %%r11, %c[r11](%0) \n\t"
|
|
"mov %%r12, %c[r12](%0) \n\t"
|
|
"mov %%r13, %c[r13](%0) \n\t"
|
|
"mov %%r14, %c[r14](%0) \n\t"
|
|
"mov %%r15, %c[r15](%0) \n\t"
|
|
#endif
|
|
"mov %%cr2, %%"R"ax \n\t"
|
|
"mov %%"R"ax, %c[cr2](%0) \n\t"
|
|
|
|
"pop %%"R"bp; pop %%"R"dx \n\t"
|
|
"setbe %c[fail](%0) \n\t"
|
|
: : "c"(vmx), "d"((unsigned long)HOST_RSP),
|
|
[launched]"i"(offsetof(struct vcpu_vmx, __launched)),
|
|
[fail]"i"(offsetof(struct vcpu_vmx, fail)),
|
|
[host_rsp]"i"(offsetof(struct vcpu_vmx, host_rsp)),
|
|
[rax]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RAX])),
|
|
[rbx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBX])),
|
|
[rcx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RCX])),
|
|
[rdx]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDX])),
|
|
[rsi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RSI])),
|
|
[rdi]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RDI])),
|
|
[rbp]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_RBP])),
|
|
#ifdef CONFIG_X86_64
|
|
[r8]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R8])),
|
|
[r9]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R9])),
|
|
[r10]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R10])),
|
|
[r11]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R11])),
|
|
[r12]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R12])),
|
|
[r13]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R13])),
|
|
[r14]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R14])),
|
|
[r15]"i"(offsetof(struct vcpu_vmx, vcpu.arch.regs[VCPU_REGS_R15])),
|
|
#endif
|
|
[cr2]"i"(offsetof(struct vcpu_vmx, vcpu.arch.cr2)),
|
|
[wordsize]"i"(sizeof(ulong))
|
|
: "cc", "memory"
|
|
, R"ax", R"bx", R"di", R"si"
|
|
#ifdef CONFIG_X86_64
|
|
, "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15"
|
|
#endif
|
|
);
|
|
|
|
vcpu->arch.regs_avail = ~((1 << VCPU_REGS_RIP) | (1 << VCPU_REGS_RSP)
|
|
| (1 << VCPU_EXREG_RFLAGS)
|
|
| (1 << VCPU_EXREG_CPL)
|
|
| (1 << VCPU_EXREG_PDPTR)
|
|
| (1 << VCPU_EXREG_SEGMENTS)
|
|
| (1 << VCPU_EXREG_CR3));
|
|
vcpu->arch.regs_dirty = 0;
|
|
|
|
vmx->idt_vectoring_info = vmcs_read32(IDT_VECTORING_INFO_FIELD);
|
|
|
|
if (is_guest_mode(vcpu)) {
|
|
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
|
|
vmcs12->idt_vectoring_info_field = vmx->idt_vectoring_info;
|
|
if (vmx->idt_vectoring_info & VECTORING_INFO_VALID_MASK) {
|
|
vmcs12->idt_vectoring_error_code =
|
|
vmcs_read32(IDT_VECTORING_ERROR_CODE);
|
|
vmcs12->vm_exit_instruction_len =
|
|
vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
|
|
}
|
|
}
|
|
|
|
asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
|
|
vmx->loaded_vmcs->launched = 1;
|
|
|
|
vmx->exit_reason = vmcs_read32(VM_EXIT_REASON);
|
|
trace_kvm_exit(vmx->exit_reason, vcpu, KVM_ISA_VMX);
|
|
|
|
vmx_complete_atomic_exit(vmx);
|
|
vmx_recover_nmi_blocking(vmx);
|
|
vmx_complete_interrupts(vmx);
|
|
}
|
|
|
|
#undef R
|
|
#undef Q
|
|
|
|
static void vmx_free_vcpu(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
|
|
free_vpid(vmx);
|
|
free_nested(vmx);
|
|
free_loaded_vmcs(vmx->loaded_vmcs);
|
|
kfree(vmx->guest_msrs);
|
|
kvm_vcpu_uninit(vcpu);
|
|
kmem_cache_free(kvm_vcpu_cache, vmx);
|
|
}
|
|
|
|
static struct kvm_vcpu *vmx_create_vcpu(struct kvm *kvm, unsigned int id)
|
|
{
|
|
int err;
|
|
struct vcpu_vmx *vmx = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
|
|
int cpu;
|
|
|
|
if (!vmx)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
allocate_vpid(vmx);
|
|
|
|
err = kvm_vcpu_init(&vmx->vcpu, kvm, id);
|
|
if (err)
|
|
goto free_vcpu;
|
|
|
|
vmx->guest_msrs = kmalloc(PAGE_SIZE, GFP_KERNEL);
|
|
err = -ENOMEM;
|
|
if (!vmx->guest_msrs) {
|
|
goto uninit_vcpu;
|
|
}
|
|
|
|
vmx->loaded_vmcs = &vmx->vmcs01;
|
|
vmx->loaded_vmcs->vmcs = alloc_vmcs();
|
|
if (!vmx->loaded_vmcs->vmcs)
|
|
goto free_msrs;
|
|
if (!vmm_exclusive)
|
|
kvm_cpu_vmxon(__pa(per_cpu(vmxarea, raw_smp_processor_id())));
|
|
loaded_vmcs_init(vmx->loaded_vmcs);
|
|
if (!vmm_exclusive)
|
|
kvm_cpu_vmxoff();
|
|
|
|
cpu = get_cpu();
|
|
vmx_vcpu_load(&vmx->vcpu, cpu);
|
|
vmx->vcpu.cpu = cpu;
|
|
err = vmx_vcpu_setup(vmx);
|
|
vmx_vcpu_put(&vmx->vcpu);
|
|
put_cpu();
|
|
if (err)
|
|
goto free_vmcs;
|
|
if (vm_need_virtualize_apic_accesses(kvm))
|
|
err = alloc_apic_access_page(kvm);
|
|
if (err)
|
|
goto free_vmcs;
|
|
|
|
if (enable_ept) {
|
|
if (!kvm->arch.ept_identity_map_addr)
|
|
kvm->arch.ept_identity_map_addr =
|
|
VMX_EPT_IDENTITY_PAGETABLE_ADDR;
|
|
err = -ENOMEM;
|
|
if (alloc_identity_pagetable(kvm) != 0)
|
|
goto free_vmcs;
|
|
if (!init_rmode_identity_map(kvm))
|
|
goto free_vmcs;
|
|
}
|
|
|
|
vmx->nested.current_vmptr = -1ull;
|
|
vmx->nested.current_vmcs12 = NULL;
|
|
|
|
return &vmx->vcpu;
|
|
|
|
free_vmcs:
|
|
free_vmcs(vmx->loaded_vmcs->vmcs);
|
|
free_msrs:
|
|
kfree(vmx->guest_msrs);
|
|
uninit_vcpu:
|
|
kvm_vcpu_uninit(&vmx->vcpu);
|
|
free_vcpu:
|
|
free_vpid(vmx);
|
|
kmem_cache_free(kvm_vcpu_cache, vmx);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static void __init vmx_check_processor_compat(void *rtn)
|
|
{
|
|
struct vmcs_config vmcs_conf;
|
|
|
|
*(int *)rtn = 0;
|
|
if (setup_vmcs_config(&vmcs_conf) < 0)
|
|
*(int *)rtn = -EIO;
|
|
if (memcmp(&vmcs_config, &vmcs_conf, sizeof(struct vmcs_config)) != 0) {
|
|
printk(KERN_ERR "kvm: CPU %d feature inconsistency!\n",
|
|
smp_processor_id());
|
|
*(int *)rtn = -EIO;
|
|
}
|
|
}
|
|
|
|
static int get_ept_level(void)
|
|
{
|
|
return VMX_EPT_DEFAULT_GAW + 1;
|
|
}
|
|
|
|
static u64 vmx_get_mt_mask(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio)
|
|
{
|
|
u64 ret;
|
|
|
|
/* For VT-d and EPT combination
|
|
* 1. MMIO: always map as UC
|
|
* 2. EPT with VT-d:
|
|
* a. VT-d without snooping control feature: can't guarantee the
|
|
* result, try to trust guest.
|
|
* b. VT-d with snooping control feature: snooping control feature of
|
|
* VT-d engine can guarantee the cache correctness. Just set it
|
|
* to WB to keep consistent with host. So the same as item 3.
|
|
* 3. EPT without VT-d: always map as WB and set IPAT=1 to keep
|
|
* consistent with host MTRR
|
|
*/
|
|
if (is_mmio)
|
|
ret = MTRR_TYPE_UNCACHABLE << VMX_EPT_MT_EPTE_SHIFT;
|
|
else if (vcpu->kvm->arch.iommu_domain &&
|
|
!(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY))
|
|
ret = kvm_get_guest_memory_type(vcpu, gfn) <<
|
|
VMX_EPT_MT_EPTE_SHIFT;
|
|
else
|
|
ret = (MTRR_TYPE_WRBACK << VMX_EPT_MT_EPTE_SHIFT)
|
|
| VMX_EPT_IPAT_BIT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int vmx_get_lpage_level(void)
|
|
{
|
|
if (enable_ept && !cpu_has_vmx_ept_1g_page())
|
|
return PT_DIRECTORY_LEVEL;
|
|
else
|
|
/* For shadow and EPT supported 1GB page */
|
|
return PT_PDPE_LEVEL;
|
|
}
|
|
|
|
static void vmx_cpuid_update(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct kvm_cpuid_entry2 *best;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 exec_control;
|
|
|
|
vmx->rdtscp_enabled = false;
|
|
if (vmx_rdtscp_supported()) {
|
|
exec_control = vmcs_read32(SECONDARY_VM_EXEC_CONTROL);
|
|
if (exec_control & SECONDARY_EXEC_RDTSCP) {
|
|
best = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
|
|
if (best && (best->edx & bit(X86_FEATURE_RDTSCP)))
|
|
vmx->rdtscp_enabled = true;
|
|
else {
|
|
exec_control &= ~SECONDARY_EXEC_RDTSCP;
|
|
vmcs_write32(SECONDARY_VM_EXEC_CONTROL,
|
|
exec_control);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
static void vmx_set_supported_cpuid(u32 func, struct kvm_cpuid_entry2 *entry)
|
|
{
|
|
if (func == 1 && nested)
|
|
entry->ecx |= bit(X86_FEATURE_VMX);
|
|
}
|
|
|
|
/*
|
|
* prepare_vmcs02 is called when the L1 guest hypervisor runs its nested
|
|
* L2 guest. L1 has a vmcs for L2 (vmcs12), and this function "merges" it
|
|
* with L0's requirements for its guest (a.k.a. vmsc01), so we can run the L2
|
|
* guest in a way that will both be appropriate to L1's requests, and our
|
|
* needs. In addition to modifying the active vmcs (which is vmcs02), this
|
|
* function also has additional necessary side-effects, like setting various
|
|
* vcpu->arch fields.
|
|
*/
|
|
static void prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
u32 exec_control;
|
|
|
|
vmcs_write16(GUEST_ES_SELECTOR, vmcs12->guest_es_selector);
|
|
vmcs_write16(GUEST_CS_SELECTOR, vmcs12->guest_cs_selector);
|
|
vmcs_write16(GUEST_SS_SELECTOR, vmcs12->guest_ss_selector);
|
|
vmcs_write16(GUEST_DS_SELECTOR, vmcs12->guest_ds_selector);
|
|
vmcs_write16(GUEST_FS_SELECTOR, vmcs12->guest_fs_selector);
|
|
vmcs_write16(GUEST_GS_SELECTOR, vmcs12->guest_gs_selector);
|
|
vmcs_write16(GUEST_LDTR_SELECTOR, vmcs12->guest_ldtr_selector);
|
|
vmcs_write16(GUEST_TR_SELECTOR, vmcs12->guest_tr_selector);
|
|
vmcs_write32(GUEST_ES_LIMIT, vmcs12->guest_es_limit);
|
|
vmcs_write32(GUEST_CS_LIMIT, vmcs12->guest_cs_limit);
|
|
vmcs_write32(GUEST_SS_LIMIT, vmcs12->guest_ss_limit);
|
|
vmcs_write32(GUEST_DS_LIMIT, vmcs12->guest_ds_limit);
|
|
vmcs_write32(GUEST_FS_LIMIT, vmcs12->guest_fs_limit);
|
|
vmcs_write32(GUEST_GS_LIMIT, vmcs12->guest_gs_limit);
|
|
vmcs_write32(GUEST_LDTR_LIMIT, vmcs12->guest_ldtr_limit);
|
|
vmcs_write32(GUEST_TR_LIMIT, vmcs12->guest_tr_limit);
|
|
vmcs_write32(GUEST_GDTR_LIMIT, vmcs12->guest_gdtr_limit);
|
|
vmcs_write32(GUEST_IDTR_LIMIT, vmcs12->guest_idtr_limit);
|
|
vmcs_write32(GUEST_ES_AR_BYTES, vmcs12->guest_es_ar_bytes);
|
|
vmcs_write32(GUEST_CS_AR_BYTES, vmcs12->guest_cs_ar_bytes);
|
|
vmcs_write32(GUEST_SS_AR_BYTES, vmcs12->guest_ss_ar_bytes);
|
|
vmcs_write32(GUEST_DS_AR_BYTES, vmcs12->guest_ds_ar_bytes);
|
|
vmcs_write32(GUEST_FS_AR_BYTES, vmcs12->guest_fs_ar_bytes);
|
|
vmcs_write32(GUEST_GS_AR_BYTES, vmcs12->guest_gs_ar_bytes);
|
|
vmcs_write32(GUEST_LDTR_AR_BYTES, vmcs12->guest_ldtr_ar_bytes);
|
|
vmcs_write32(GUEST_TR_AR_BYTES, vmcs12->guest_tr_ar_bytes);
|
|
vmcs_writel(GUEST_ES_BASE, vmcs12->guest_es_base);
|
|
vmcs_writel(GUEST_CS_BASE, vmcs12->guest_cs_base);
|
|
vmcs_writel(GUEST_SS_BASE, vmcs12->guest_ss_base);
|
|
vmcs_writel(GUEST_DS_BASE, vmcs12->guest_ds_base);
|
|
vmcs_writel(GUEST_FS_BASE, vmcs12->guest_fs_base);
|
|
vmcs_writel(GUEST_GS_BASE, vmcs12->guest_gs_base);
|
|
vmcs_writel(GUEST_LDTR_BASE, vmcs12->guest_ldtr_base);
|
|
vmcs_writel(GUEST_TR_BASE, vmcs12->guest_tr_base);
|
|
vmcs_writel(GUEST_GDTR_BASE, vmcs12->guest_gdtr_base);
|
|
vmcs_writel(GUEST_IDTR_BASE, vmcs12->guest_idtr_base);
|
|
|
|
vmcs_write64(GUEST_IA32_DEBUGCTL, vmcs12->guest_ia32_debugctl);
|
|
vmcs_write32(VM_ENTRY_INTR_INFO_FIELD,
|
|
vmcs12->vm_entry_intr_info_field);
|
|
vmcs_write32(VM_ENTRY_EXCEPTION_ERROR_CODE,
|
|
vmcs12->vm_entry_exception_error_code);
|
|
vmcs_write32(VM_ENTRY_INSTRUCTION_LEN,
|
|
vmcs12->vm_entry_instruction_len);
|
|
vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
|
|
vmcs12->guest_interruptibility_info);
|
|
vmcs_write32(GUEST_ACTIVITY_STATE, vmcs12->guest_activity_state);
|
|
vmcs_write32(GUEST_SYSENTER_CS, vmcs12->guest_sysenter_cs);
|
|
vmcs_writel(GUEST_DR7, vmcs12->guest_dr7);
|
|
vmcs_writel(GUEST_RFLAGS, vmcs12->guest_rflags);
|
|
vmcs_writel(GUEST_PENDING_DBG_EXCEPTIONS,
|
|
vmcs12->guest_pending_dbg_exceptions);
|
|
vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->guest_sysenter_esp);
|
|
vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->guest_sysenter_eip);
|
|
|
|
vmcs_write64(VMCS_LINK_POINTER, -1ull);
|
|
|
|
vmcs_write32(PIN_BASED_VM_EXEC_CONTROL,
|
|
(vmcs_config.pin_based_exec_ctrl |
|
|
vmcs12->pin_based_vm_exec_control));
|
|
|
|
/*
|
|
* Whether page-faults are trapped is determined by a combination of
|
|
* 3 settings: PFEC_MASK, PFEC_MATCH and EXCEPTION_BITMAP.PF.
|
|
* If enable_ept, L0 doesn't care about page faults and we should
|
|
* set all of these to L1's desires. However, if !enable_ept, L0 does
|
|
* care about (at least some) page faults, and because it is not easy
|
|
* (if at all possible?) to merge L0 and L1's desires, we simply ask
|
|
* to exit on each and every L2 page fault. This is done by setting
|
|
* MASK=MATCH=0 and (see below) EB.PF=1.
|
|
* Note that below we don't need special code to set EB.PF beyond the
|
|
* "or"ing of the EB of vmcs01 and vmcs12, because when enable_ept,
|
|
* vmcs01's EB.PF is 0 so the "or" will take vmcs12's value, and when
|
|
* !enable_ept, EB.PF is 1, so the "or" will always be 1.
|
|
*
|
|
* A problem with this approach (when !enable_ept) is that L1 may be
|
|
* injected with more page faults than it asked for. This could have
|
|
* caused problems, but in practice existing hypervisors don't care.
|
|
* To fix this, we will need to emulate the PFEC checking (on the L1
|
|
* page tables), using walk_addr(), when injecting PFs to L1.
|
|
*/
|
|
vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK,
|
|
enable_ept ? vmcs12->page_fault_error_code_mask : 0);
|
|
vmcs_write32(PAGE_FAULT_ERROR_CODE_MATCH,
|
|
enable_ept ? vmcs12->page_fault_error_code_match : 0);
|
|
|
|
if (cpu_has_secondary_exec_ctrls()) {
|
|
u32 exec_control = vmx_secondary_exec_control(vmx);
|
|
if (!vmx->rdtscp_enabled)
|
|
exec_control &= ~SECONDARY_EXEC_RDTSCP;
|
|
/* Take the following fields only from vmcs12 */
|
|
exec_control &= ~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
|
|
if (nested_cpu_has(vmcs12,
|
|
CPU_BASED_ACTIVATE_SECONDARY_CONTROLS))
|
|
exec_control |= vmcs12->secondary_vm_exec_control;
|
|
|
|
if (exec_control & SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) {
|
|
/*
|
|
* Translate L1 physical address to host physical
|
|
* address for vmcs02. Keep the page pinned, so this
|
|
* physical address remains valid. We keep a reference
|
|
* to it so we can release it later.
|
|
*/
|
|
if (vmx->nested.apic_access_page) /* shouldn't happen */
|
|
nested_release_page(vmx->nested.apic_access_page);
|
|
vmx->nested.apic_access_page =
|
|
nested_get_page(vcpu, vmcs12->apic_access_addr);
|
|
/*
|
|
* If translation failed, no matter: This feature asks
|
|
* to exit when accessing the given address, and if it
|
|
* can never be accessed, this feature won't do
|
|
* anything anyway.
|
|
*/
|
|
if (!vmx->nested.apic_access_page)
|
|
exec_control &=
|
|
~SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES;
|
|
else
|
|
vmcs_write64(APIC_ACCESS_ADDR,
|
|
page_to_phys(vmx->nested.apic_access_page));
|
|
}
|
|
|
|
vmcs_write32(SECONDARY_VM_EXEC_CONTROL, exec_control);
|
|
}
|
|
|
|
|
|
/*
|
|
* Set host-state according to L0's settings (vmcs12 is irrelevant here)
|
|
* Some constant fields are set here by vmx_set_constant_host_state().
|
|
* Other fields are different per CPU, and will be set later when
|
|
* vmx_vcpu_load() is called, and when vmx_save_host_state() is called.
|
|
*/
|
|
vmx_set_constant_host_state();
|
|
|
|
/*
|
|
* HOST_RSP is normally set correctly in vmx_vcpu_run() just before
|
|
* entry, but only if the current (host) sp changed from the value
|
|
* we wrote last (vmx->host_rsp). This cache is no longer relevant
|
|
* if we switch vmcs, and rather than hold a separate cache per vmcs,
|
|
* here we just force the write to happen on entry.
|
|
*/
|
|
vmx->host_rsp = 0;
|
|
|
|
exec_control = vmx_exec_control(vmx); /* L0's desires */
|
|
exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
|
|
exec_control &= ~CPU_BASED_VIRTUAL_NMI_PENDING;
|
|
exec_control &= ~CPU_BASED_TPR_SHADOW;
|
|
exec_control |= vmcs12->cpu_based_vm_exec_control;
|
|
/*
|
|
* Merging of IO and MSR bitmaps not currently supported.
|
|
* Rather, exit every time.
|
|
*/
|
|
exec_control &= ~CPU_BASED_USE_MSR_BITMAPS;
|
|
exec_control &= ~CPU_BASED_USE_IO_BITMAPS;
|
|
exec_control |= CPU_BASED_UNCOND_IO_EXITING;
|
|
|
|
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, exec_control);
|
|
|
|
/* EXCEPTION_BITMAP and CR0_GUEST_HOST_MASK should basically be the
|
|
* bitwise-or of what L1 wants to trap for L2, and what we want to
|
|
* trap. Note that CR0.TS also needs updating - we do this later.
|
|
*/
|
|
update_exception_bitmap(vcpu);
|
|
vcpu->arch.cr0_guest_owned_bits &= ~vmcs12->cr0_guest_host_mask;
|
|
vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
|
|
|
|
/* Note: IA32_MODE, LOAD_IA32_EFER are modified by vmx_set_efer below */
|
|
vmcs_write32(VM_EXIT_CONTROLS,
|
|
vmcs12->vm_exit_controls | vmcs_config.vmexit_ctrl);
|
|
vmcs_write32(VM_ENTRY_CONTROLS, vmcs12->vm_entry_controls |
|
|
(vmcs_config.vmentry_ctrl & ~VM_ENTRY_IA32E_MODE));
|
|
|
|
if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PAT)
|
|
vmcs_write64(GUEST_IA32_PAT, vmcs12->guest_ia32_pat);
|
|
else if (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_PAT)
|
|
vmcs_write64(GUEST_IA32_PAT, vmx->vcpu.arch.pat);
|
|
|
|
|
|
set_cr4_guest_host_mask(vmx);
|
|
|
|
if (vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_TSC_OFFSETING)
|
|
vmcs_write64(TSC_OFFSET,
|
|
vmx->nested.vmcs01_tsc_offset + vmcs12->tsc_offset);
|
|
else
|
|
vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset);
|
|
|
|
if (enable_vpid) {
|
|
/*
|
|
* Trivially support vpid by letting L2s share their parent
|
|
* L1's vpid. TODO: move to a more elaborate solution, giving
|
|
* each L2 its own vpid and exposing the vpid feature to L1.
|
|
*/
|
|
vmcs_write16(VIRTUAL_PROCESSOR_ID, vmx->vpid);
|
|
vmx_flush_tlb(vcpu);
|
|
}
|
|
|
|
if (vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_EFER)
|
|
vcpu->arch.efer = vmcs12->guest_ia32_efer;
|
|
if (vmcs12->vm_entry_controls & VM_ENTRY_IA32E_MODE)
|
|
vcpu->arch.efer |= (EFER_LMA | EFER_LME);
|
|
else
|
|
vcpu->arch.efer &= ~(EFER_LMA | EFER_LME);
|
|
/* Note: modifies VM_ENTRY/EXIT_CONTROLS and GUEST/HOST_IA32_EFER */
|
|
vmx_set_efer(vcpu, vcpu->arch.efer);
|
|
|
|
/*
|
|
* This sets GUEST_CR0 to vmcs12->guest_cr0, with possibly a modified
|
|
* TS bit (for lazy fpu) and bits which we consider mandatory enabled.
|
|
* The CR0_READ_SHADOW is what L2 should have expected to read given
|
|
* the specifications by L1; It's not enough to take
|
|
* vmcs12->cr0_read_shadow because on our cr0_guest_host_mask we we
|
|
* have more bits than L1 expected.
|
|
*/
|
|
vmx_set_cr0(vcpu, vmcs12->guest_cr0);
|
|
vmcs_writel(CR0_READ_SHADOW, nested_read_cr0(vmcs12));
|
|
|
|
vmx_set_cr4(vcpu, vmcs12->guest_cr4);
|
|
vmcs_writel(CR4_READ_SHADOW, nested_read_cr4(vmcs12));
|
|
|
|
/* shadow page tables on either EPT or shadow page tables */
|
|
kvm_set_cr3(vcpu, vmcs12->guest_cr3);
|
|
kvm_mmu_reset_context(vcpu);
|
|
|
|
kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->guest_rsp);
|
|
kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->guest_rip);
|
|
}
|
|
|
|
/*
|
|
* nested_vmx_run() handles a nested entry, i.e., a VMLAUNCH or VMRESUME on L1
|
|
* for running an L2 nested guest.
|
|
*/
|
|
static int nested_vmx_run(struct kvm_vcpu *vcpu, bool launch)
|
|
{
|
|
struct vmcs12 *vmcs12;
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
int cpu;
|
|
struct loaded_vmcs *vmcs02;
|
|
|
|
if (!nested_vmx_check_permission(vcpu) ||
|
|
!nested_vmx_check_vmcs12(vcpu))
|
|
return 1;
|
|
|
|
skip_emulated_instruction(vcpu);
|
|
vmcs12 = get_vmcs12(vcpu);
|
|
|
|
/*
|
|
* The nested entry process starts with enforcing various prerequisites
|
|
* on vmcs12 as required by the Intel SDM, and act appropriately when
|
|
* they fail: As the SDM explains, some conditions should cause the
|
|
* instruction to fail, while others will cause the instruction to seem
|
|
* to succeed, but return an EXIT_REASON_INVALID_STATE.
|
|
* To speed up the normal (success) code path, we should avoid checking
|
|
* for misconfigurations which will anyway be caught by the processor
|
|
* when using the merged vmcs02.
|
|
*/
|
|
if (vmcs12->launch_state == launch) {
|
|
nested_vmx_failValid(vcpu,
|
|
launch ? VMXERR_VMLAUNCH_NONCLEAR_VMCS
|
|
: VMXERR_VMRESUME_NONLAUNCHED_VMCS);
|
|
return 1;
|
|
}
|
|
|
|
if ((vmcs12->cpu_based_vm_exec_control & CPU_BASED_USE_MSR_BITMAPS) &&
|
|
!IS_ALIGNED(vmcs12->msr_bitmap, PAGE_SIZE)) {
|
|
/*TODO: Also verify bits beyond physical address width are 0*/
|
|
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
|
|
return 1;
|
|
}
|
|
|
|
if (nested_cpu_has2(vmcs12, SECONDARY_EXEC_VIRTUALIZE_APIC_ACCESSES) &&
|
|
!IS_ALIGNED(vmcs12->apic_access_addr, PAGE_SIZE)) {
|
|
/*TODO: Also verify bits beyond physical address width are 0*/
|
|
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
|
|
return 1;
|
|
}
|
|
|
|
if (vmcs12->vm_entry_msr_load_count > 0 ||
|
|
vmcs12->vm_exit_msr_load_count > 0 ||
|
|
vmcs12->vm_exit_msr_store_count > 0) {
|
|
pr_warn_ratelimited("%s: VMCS MSR_{LOAD,STORE} unsupported\n",
|
|
__func__);
|
|
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
|
|
return 1;
|
|
}
|
|
|
|
if (!vmx_control_verify(vmcs12->cpu_based_vm_exec_control,
|
|
nested_vmx_procbased_ctls_low, nested_vmx_procbased_ctls_high) ||
|
|
!vmx_control_verify(vmcs12->secondary_vm_exec_control,
|
|
nested_vmx_secondary_ctls_low, nested_vmx_secondary_ctls_high) ||
|
|
!vmx_control_verify(vmcs12->pin_based_vm_exec_control,
|
|
nested_vmx_pinbased_ctls_low, nested_vmx_pinbased_ctls_high) ||
|
|
!vmx_control_verify(vmcs12->vm_exit_controls,
|
|
nested_vmx_exit_ctls_low, nested_vmx_exit_ctls_high) ||
|
|
!vmx_control_verify(vmcs12->vm_entry_controls,
|
|
nested_vmx_entry_ctls_low, nested_vmx_entry_ctls_high))
|
|
{
|
|
nested_vmx_failValid(vcpu, VMXERR_ENTRY_INVALID_CONTROL_FIELD);
|
|
return 1;
|
|
}
|
|
|
|
if (((vmcs12->host_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) ||
|
|
((vmcs12->host_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) {
|
|
nested_vmx_failValid(vcpu,
|
|
VMXERR_ENTRY_INVALID_HOST_STATE_FIELD);
|
|
return 1;
|
|
}
|
|
|
|
if (((vmcs12->guest_cr0 & VMXON_CR0_ALWAYSON) != VMXON_CR0_ALWAYSON) ||
|
|
((vmcs12->guest_cr4 & VMXON_CR4_ALWAYSON) != VMXON_CR4_ALWAYSON)) {
|
|
nested_vmx_entry_failure(vcpu, vmcs12,
|
|
EXIT_REASON_INVALID_STATE, ENTRY_FAIL_DEFAULT);
|
|
return 1;
|
|
}
|
|
if (vmcs12->vmcs_link_pointer != -1ull) {
|
|
nested_vmx_entry_failure(vcpu, vmcs12,
|
|
EXIT_REASON_INVALID_STATE, ENTRY_FAIL_VMCS_LINK_PTR);
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* We're finally done with prerequisite checking, and can start with
|
|
* the nested entry.
|
|
*/
|
|
|
|
vmcs02 = nested_get_current_vmcs02(vmx);
|
|
if (!vmcs02)
|
|
return -ENOMEM;
|
|
|
|
enter_guest_mode(vcpu);
|
|
|
|
vmx->nested.vmcs01_tsc_offset = vmcs_read64(TSC_OFFSET);
|
|
|
|
cpu = get_cpu();
|
|
vmx->loaded_vmcs = vmcs02;
|
|
vmx_vcpu_put(vcpu);
|
|
vmx_vcpu_load(vcpu, cpu);
|
|
vcpu->cpu = cpu;
|
|
put_cpu();
|
|
|
|
vmcs12->launch_state = 1;
|
|
|
|
prepare_vmcs02(vcpu, vmcs12);
|
|
|
|
/*
|
|
* Note no nested_vmx_succeed or nested_vmx_fail here. At this point
|
|
* we are no longer running L1, and VMLAUNCH/VMRESUME has not yet
|
|
* returned as far as L1 is concerned. It will only return (and set
|
|
* the success flag) when L2 exits (see nested_vmx_vmexit()).
|
|
*/
|
|
return 1;
|
|
}
|
|
|
|
/*
|
|
* On a nested exit from L2 to L1, vmcs12.guest_cr0 might not be up-to-date
|
|
* because L2 may have changed some cr0 bits directly (CRO_GUEST_HOST_MASK).
|
|
* This function returns the new value we should put in vmcs12.guest_cr0.
|
|
* It's not enough to just return the vmcs02 GUEST_CR0. Rather,
|
|
* 1. Bits that neither L0 nor L1 trapped, were set directly by L2 and are now
|
|
* available in vmcs02 GUEST_CR0. (Note: It's enough to check that L0
|
|
* didn't trap the bit, because if L1 did, so would L0).
|
|
* 2. Bits that L1 asked to trap (and therefore L0 also did) could not have
|
|
* been modified by L2, and L1 knows it. So just leave the old value of
|
|
* the bit from vmcs12.guest_cr0. Note that the bit from vmcs02 GUEST_CR0
|
|
* isn't relevant, because if L0 traps this bit it can set it to anything.
|
|
* 3. Bits that L1 didn't trap, but L0 did. L1 believes the guest could have
|
|
* changed these bits, and therefore they need to be updated, but L0
|
|
* didn't necessarily allow them to be changed in GUEST_CR0 - and rather
|
|
* put them in vmcs02 CR0_READ_SHADOW. So take these bits from there.
|
|
*/
|
|
static inline unsigned long
|
|
vmcs12_guest_cr0(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
|
|
{
|
|
return
|
|
/*1*/ (vmcs_readl(GUEST_CR0) & vcpu->arch.cr0_guest_owned_bits) |
|
|
/*2*/ (vmcs12->guest_cr0 & vmcs12->cr0_guest_host_mask) |
|
|
/*3*/ (vmcs_readl(CR0_READ_SHADOW) & ~(vmcs12->cr0_guest_host_mask |
|
|
vcpu->arch.cr0_guest_owned_bits));
|
|
}
|
|
|
|
static inline unsigned long
|
|
vmcs12_guest_cr4(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
|
|
{
|
|
return
|
|
/*1*/ (vmcs_readl(GUEST_CR4) & vcpu->arch.cr4_guest_owned_bits) |
|
|
/*2*/ (vmcs12->guest_cr4 & vmcs12->cr4_guest_host_mask) |
|
|
/*3*/ (vmcs_readl(CR4_READ_SHADOW) & ~(vmcs12->cr4_guest_host_mask |
|
|
vcpu->arch.cr4_guest_owned_bits));
|
|
}
|
|
|
|
/*
|
|
* prepare_vmcs12 is part of what we need to do when the nested L2 guest exits
|
|
* and we want to prepare to run its L1 parent. L1 keeps a vmcs for L2 (vmcs12),
|
|
* and this function updates it to reflect the changes to the guest state while
|
|
* L2 was running (and perhaps made some exits which were handled directly by L0
|
|
* without going back to L1), and to reflect the exit reason.
|
|
* Note that we do not have to copy here all VMCS fields, just those that
|
|
* could have changed by the L2 guest or the exit - i.e., the guest-state and
|
|
* exit-information fields only. Other fields are modified by L1 with VMWRITE,
|
|
* which already writes to vmcs12 directly.
|
|
*/
|
|
void prepare_vmcs12(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
|
|
{
|
|
/* update guest state fields: */
|
|
vmcs12->guest_cr0 = vmcs12_guest_cr0(vcpu, vmcs12);
|
|
vmcs12->guest_cr4 = vmcs12_guest_cr4(vcpu, vmcs12);
|
|
|
|
kvm_get_dr(vcpu, 7, (unsigned long *)&vmcs12->guest_dr7);
|
|
vmcs12->guest_rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
|
|
vmcs12->guest_rip = kvm_register_read(vcpu, VCPU_REGS_RIP);
|
|
vmcs12->guest_rflags = vmcs_readl(GUEST_RFLAGS);
|
|
|
|
vmcs12->guest_es_selector = vmcs_read16(GUEST_ES_SELECTOR);
|
|
vmcs12->guest_cs_selector = vmcs_read16(GUEST_CS_SELECTOR);
|
|
vmcs12->guest_ss_selector = vmcs_read16(GUEST_SS_SELECTOR);
|
|
vmcs12->guest_ds_selector = vmcs_read16(GUEST_DS_SELECTOR);
|
|
vmcs12->guest_fs_selector = vmcs_read16(GUEST_FS_SELECTOR);
|
|
vmcs12->guest_gs_selector = vmcs_read16(GUEST_GS_SELECTOR);
|
|
vmcs12->guest_ldtr_selector = vmcs_read16(GUEST_LDTR_SELECTOR);
|
|
vmcs12->guest_tr_selector = vmcs_read16(GUEST_TR_SELECTOR);
|
|
vmcs12->guest_es_limit = vmcs_read32(GUEST_ES_LIMIT);
|
|
vmcs12->guest_cs_limit = vmcs_read32(GUEST_CS_LIMIT);
|
|
vmcs12->guest_ss_limit = vmcs_read32(GUEST_SS_LIMIT);
|
|
vmcs12->guest_ds_limit = vmcs_read32(GUEST_DS_LIMIT);
|
|
vmcs12->guest_fs_limit = vmcs_read32(GUEST_FS_LIMIT);
|
|
vmcs12->guest_gs_limit = vmcs_read32(GUEST_GS_LIMIT);
|
|
vmcs12->guest_ldtr_limit = vmcs_read32(GUEST_LDTR_LIMIT);
|
|
vmcs12->guest_tr_limit = vmcs_read32(GUEST_TR_LIMIT);
|
|
vmcs12->guest_gdtr_limit = vmcs_read32(GUEST_GDTR_LIMIT);
|
|
vmcs12->guest_idtr_limit = vmcs_read32(GUEST_IDTR_LIMIT);
|
|
vmcs12->guest_es_ar_bytes = vmcs_read32(GUEST_ES_AR_BYTES);
|
|
vmcs12->guest_cs_ar_bytes = vmcs_read32(GUEST_CS_AR_BYTES);
|
|
vmcs12->guest_ss_ar_bytes = vmcs_read32(GUEST_SS_AR_BYTES);
|
|
vmcs12->guest_ds_ar_bytes = vmcs_read32(GUEST_DS_AR_BYTES);
|
|
vmcs12->guest_fs_ar_bytes = vmcs_read32(GUEST_FS_AR_BYTES);
|
|
vmcs12->guest_gs_ar_bytes = vmcs_read32(GUEST_GS_AR_BYTES);
|
|
vmcs12->guest_ldtr_ar_bytes = vmcs_read32(GUEST_LDTR_AR_BYTES);
|
|
vmcs12->guest_tr_ar_bytes = vmcs_read32(GUEST_TR_AR_BYTES);
|
|
vmcs12->guest_es_base = vmcs_readl(GUEST_ES_BASE);
|
|
vmcs12->guest_cs_base = vmcs_readl(GUEST_CS_BASE);
|
|
vmcs12->guest_ss_base = vmcs_readl(GUEST_SS_BASE);
|
|
vmcs12->guest_ds_base = vmcs_readl(GUEST_DS_BASE);
|
|
vmcs12->guest_fs_base = vmcs_readl(GUEST_FS_BASE);
|
|
vmcs12->guest_gs_base = vmcs_readl(GUEST_GS_BASE);
|
|
vmcs12->guest_ldtr_base = vmcs_readl(GUEST_LDTR_BASE);
|
|
vmcs12->guest_tr_base = vmcs_readl(GUEST_TR_BASE);
|
|
vmcs12->guest_gdtr_base = vmcs_readl(GUEST_GDTR_BASE);
|
|
vmcs12->guest_idtr_base = vmcs_readl(GUEST_IDTR_BASE);
|
|
|
|
vmcs12->guest_activity_state = vmcs_read32(GUEST_ACTIVITY_STATE);
|
|
vmcs12->guest_interruptibility_info =
|
|
vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
|
|
vmcs12->guest_pending_dbg_exceptions =
|
|
vmcs_readl(GUEST_PENDING_DBG_EXCEPTIONS);
|
|
|
|
/* TODO: These cannot have changed unless we have MSR bitmaps and
|
|
* the relevant bit asks not to trap the change */
|
|
vmcs12->guest_ia32_debugctl = vmcs_read64(GUEST_IA32_DEBUGCTL);
|
|
if (vmcs12->vm_entry_controls & VM_EXIT_SAVE_IA32_PAT)
|
|
vmcs12->guest_ia32_pat = vmcs_read64(GUEST_IA32_PAT);
|
|
vmcs12->guest_sysenter_cs = vmcs_read32(GUEST_SYSENTER_CS);
|
|
vmcs12->guest_sysenter_esp = vmcs_readl(GUEST_SYSENTER_ESP);
|
|
vmcs12->guest_sysenter_eip = vmcs_readl(GUEST_SYSENTER_EIP);
|
|
|
|
/* update exit information fields: */
|
|
|
|
vmcs12->vm_exit_reason = vmcs_read32(VM_EXIT_REASON);
|
|
vmcs12->exit_qualification = vmcs_readl(EXIT_QUALIFICATION);
|
|
|
|
vmcs12->vm_exit_intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
|
|
vmcs12->vm_exit_intr_error_code = vmcs_read32(VM_EXIT_INTR_ERROR_CODE);
|
|
vmcs12->idt_vectoring_info_field =
|
|
vmcs_read32(IDT_VECTORING_INFO_FIELD);
|
|
vmcs12->idt_vectoring_error_code =
|
|
vmcs_read32(IDT_VECTORING_ERROR_CODE);
|
|
vmcs12->vm_exit_instruction_len = vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
|
|
vmcs12->vmx_instruction_info = vmcs_read32(VMX_INSTRUCTION_INFO);
|
|
|
|
/* clear vm-entry fields which are to be cleared on exit */
|
|
if (!(vmcs12->vm_exit_reason & VMX_EXIT_REASONS_FAILED_VMENTRY))
|
|
vmcs12->vm_entry_intr_info_field &= ~INTR_INFO_VALID_MASK;
|
|
}
|
|
|
|
/*
|
|
* A part of what we need to when the nested L2 guest exits and we want to
|
|
* run its L1 parent, is to reset L1's guest state to the host state specified
|
|
* in vmcs12.
|
|
* This function is to be called not only on normal nested exit, but also on
|
|
* a nested entry failure, as explained in Intel's spec, 3B.23.7 ("VM-Entry
|
|
* Failures During or After Loading Guest State").
|
|
* This function should be called when the active VMCS is L1's (vmcs01).
|
|
*/
|
|
void load_vmcs12_host_state(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12)
|
|
{
|
|
if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_EFER)
|
|
vcpu->arch.efer = vmcs12->host_ia32_efer;
|
|
if (vmcs12->vm_exit_controls & VM_EXIT_HOST_ADDR_SPACE_SIZE)
|
|
vcpu->arch.efer |= (EFER_LMA | EFER_LME);
|
|
else
|
|
vcpu->arch.efer &= ~(EFER_LMA | EFER_LME);
|
|
vmx_set_efer(vcpu, vcpu->arch.efer);
|
|
|
|
kvm_register_write(vcpu, VCPU_REGS_RSP, vmcs12->host_rsp);
|
|
kvm_register_write(vcpu, VCPU_REGS_RIP, vmcs12->host_rip);
|
|
/*
|
|
* Note that calling vmx_set_cr0 is important, even if cr0 hasn't
|
|
* actually changed, because it depends on the current state of
|
|
* fpu_active (which may have changed).
|
|
* Note that vmx_set_cr0 refers to efer set above.
|
|
*/
|
|
kvm_set_cr0(vcpu, vmcs12->host_cr0);
|
|
/*
|
|
* If we did fpu_activate()/fpu_deactivate() during L2's run, we need
|
|
* to apply the same changes to L1's vmcs. We just set cr0 correctly,
|
|
* but we also need to update cr0_guest_host_mask and exception_bitmap.
|
|
*/
|
|
update_exception_bitmap(vcpu);
|
|
vcpu->arch.cr0_guest_owned_bits = (vcpu->fpu_active ? X86_CR0_TS : 0);
|
|
vmcs_writel(CR0_GUEST_HOST_MASK, ~vcpu->arch.cr0_guest_owned_bits);
|
|
|
|
/*
|
|
* Note that CR4_GUEST_HOST_MASK is already set in the original vmcs01
|
|
* (KVM doesn't change it)- no reason to call set_cr4_guest_host_mask();
|
|
*/
|
|
vcpu->arch.cr4_guest_owned_bits = ~vmcs_readl(CR4_GUEST_HOST_MASK);
|
|
kvm_set_cr4(vcpu, vmcs12->host_cr4);
|
|
|
|
/* shadow page tables on either EPT or shadow page tables */
|
|
kvm_set_cr3(vcpu, vmcs12->host_cr3);
|
|
kvm_mmu_reset_context(vcpu);
|
|
|
|
if (enable_vpid) {
|
|
/*
|
|
* Trivially support vpid by letting L2s share their parent
|
|
* L1's vpid. TODO: move to a more elaborate solution, giving
|
|
* each L2 its own vpid and exposing the vpid feature to L1.
|
|
*/
|
|
vmx_flush_tlb(vcpu);
|
|
}
|
|
|
|
|
|
vmcs_write32(GUEST_SYSENTER_CS, vmcs12->host_ia32_sysenter_cs);
|
|
vmcs_writel(GUEST_SYSENTER_ESP, vmcs12->host_ia32_sysenter_esp);
|
|
vmcs_writel(GUEST_SYSENTER_EIP, vmcs12->host_ia32_sysenter_eip);
|
|
vmcs_writel(GUEST_IDTR_BASE, vmcs12->host_idtr_base);
|
|
vmcs_writel(GUEST_GDTR_BASE, vmcs12->host_gdtr_base);
|
|
vmcs_writel(GUEST_TR_BASE, vmcs12->host_tr_base);
|
|
vmcs_writel(GUEST_GS_BASE, vmcs12->host_gs_base);
|
|
vmcs_writel(GUEST_FS_BASE, vmcs12->host_fs_base);
|
|
vmcs_write16(GUEST_ES_SELECTOR, vmcs12->host_es_selector);
|
|
vmcs_write16(GUEST_CS_SELECTOR, vmcs12->host_cs_selector);
|
|
vmcs_write16(GUEST_SS_SELECTOR, vmcs12->host_ss_selector);
|
|
vmcs_write16(GUEST_DS_SELECTOR, vmcs12->host_ds_selector);
|
|
vmcs_write16(GUEST_FS_SELECTOR, vmcs12->host_fs_selector);
|
|
vmcs_write16(GUEST_GS_SELECTOR, vmcs12->host_gs_selector);
|
|
vmcs_write16(GUEST_TR_SELECTOR, vmcs12->host_tr_selector);
|
|
|
|
if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PAT)
|
|
vmcs_write64(GUEST_IA32_PAT, vmcs12->host_ia32_pat);
|
|
if (vmcs12->vm_exit_controls & VM_EXIT_LOAD_IA32_PERF_GLOBAL_CTRL)
|
|
vmcs_write64(GUEST_IA32_PERF_GLOBAL_CTRL,
|
|
vmcs12->host_ia32_perf_global_ctrl);
|
|
}
|
|
|
|
/*
|
|
* Emulate an exit from nested guest (L2) to L1, i.e., prepare to run L1
|
|
* and modify vmcs12 to make it see what it would expect to see there if
|
|
* L2 was its real guest. Must only be called when in L2 (is_guest_mode())
|
|
*/
|
|
static void nested_vmx_vmexit(struct kvm_vcpu *vcpu)
|
|
{
|
|
struct vcpu_vmx *vmx = to_vmx(vcpu);
|
|
int cpu;
|
|
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
|
|
|
|
leave_guest_mode(vcpu);
|
|
prepare_vmcs12(vcpu, vmcs12);
|
|
|
|
cpu = get_cpu();
|
|
vmx->loaded_vmcs = &vmx->vmcs01;
|
|
vmx_vcpu_put(vcpu);
|
|
vmx_vcpu_load(vcpu, cpu);
|
|
vcpu->cpu = cpu;
|
|
put_cpu();
|
|
|
|
/* if no vmcs02 cache requested, remove the one we used */
|
|
if (VMCS02_POOL_SIZE == 0)
|
|
nested_free_vmcs02(vmx, vmx->nested.current_vmptr);
|
|
|
|
load_vmcs12_host_state(vcpu, vmcs12);
|
|
|
|
/* Update TSC_OFFSET if TSC was changed while L2 ran */
|
|
vmcs_write64(TSC_OFFSET, vmx->nested.vmcs01_tsc_offset);
|
|
|
|
/* This is needed for same reason as it was needed in prepare_vmcs02 */
|
|
vmx->host_rsp = 0;
|
|
|
|
/* Unpin physical memory we referred to in vmcs02 */
|
|
if (vmx->nested.apic_access_page) {
|
|
nested_release_page(vmx->nested.apic_access_page);
|
|
vmx->nested.apic_access_page = 0;
|
|
}
|
|
|
|
/*
|
|
* Exiting from L2 to L1, we're now back to L1 which thinks it just
|
|
* finished a VMLAUNCH or VMRESUME instruction, so we need to set the
|
|
* success or failure flag accordingly.
|
|
*/
|
|
if (unlikely(vmx->fail)) {
|
|
vmx->fail = 0;
|
|
nested_vmx_failValid(vcpu, vmcs_read32(VM_INSTRUCTION_ERROR));
|
|
} else
|
|
nested_vmx_succeed(vcpu);
|
|
}
|
|
|
|
/*
|
|
* L1's failure to enter L2 is a subset of a normal exit, as explained in
|
|
* 23.7 "VM-entry failures during or after loading guest state" (this also
|
|
* lists the acceptable exit-reason and exit-qualification parameters).
|
|
* It should only be called before L2 actually succeeded to run, and when
|
|
* vmcs01 is current (it doesn't leave_guest_mode() or switch vmcss).
|
|
*/
|
|
static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu,
|
|
struct vmcs12 *vmcs12,
|
|
u32 reason, unsigned long qualification)
|
|
{
|
|
load_vmcs12_host_state(vcpu, vmcs12);
|
|
vmcs12->vm_exit_reason = reason | VMX_EXIT_REASONS_FAILED_VMENTRY;
|
|
vmcs12->exit_qualification = qualification;
|
|
nested_vmx_succeed(vcpu);
|
|
}
|
|
|
|
static int vmx_check_intercept(struct kvm_vcpu *vcpu,
|
|
struct x86_instruction_info *info,
|
|
enum x86_intercept_stage stage)
|
|
{
|
|
return X86EMUL_CONTINUE;
|
|
}
|
|
|
|
static struct kvm_x86_ops vmx_x86_ops = {
|
|
.cpu_has_kvm_support = cpu_has_kvm_support,
|
|
.disabled_by_bios = vmx_disabled_by_bios,
|
|
.hardware_setup = hardware_setup,
|
|
.hardware_unsetup = hardware_unsetup,
|
|
.check_processor_compatibility = vmx_check_processor_compat,
|
|
.hardware_enable = hardware_enable,
|
|
.hardware_disable = hardware_disable,
|
|
.cpu_has_accelerated_tpr = report_flexpriority,
|
|
|
|
.vcpu_create = vmx_create_vcpu,
|
|
.vcpu_free = vmx_free_vcpu,
|
|
.vcpu_reset = vmx_vcpu_reset,
|
|
|
|
.prepare_guest_switch = vmx_save_host_state,
|
|
.vcpu_load = vmx_vcpu_load,
|
|
.vcpu_put = vmx_vcpu_put,
|
|
|
|
.set_guest_debug = set_guest_debug,
|
|
.get_msr = vmx_get_msr,
|
|
.set_msr = vmx_set_msr,
|
|
.get_segment_base = vmx_get_segment_base,
|
|
.get_segment = vmx_get_segment,
|
|
.set_segment = vmx_set_segment,
|
|
.get_cpl = vmx_get_cpl,
|
|
.get_cs_db_l_bits = vmx_get_cs_db_l_bits,
|
|
.decache_cr0_guest_bits = vmx_decache_cr0_guest_bits,
|
|
.decache_cr3 = vmx_decache_cr3,
|
|
.decache_cr4_guest_bits = vmx_decache_cr4_guest_bits,
|
|
.set_cr0 = vmx_set_cr0,
|
|
.set_cr3 = vmx_set_cr3,
|
|
.set_cr4 = vmx_set_cr4,
|
|
.set_efer = vmx_set_efer,
|
|
.get_idt = vmx_get_idt,
|
|
.set_idt = vmx_set_idt,
|
|
.get_gdt = vmx_get_gdt,
|
|
.set_gdt = vmx_set_gdt,
|
|
.set_dr7 = vmx_set_dr7,
|
|
.cache_reg = vmx_cache_reg,
|
|
.get_rflags = vmx_get_rflags,
|
|
.set_rflags = vmx_set_rflags,
|
|
.fpu_activate = vmx_fpu_activate,
|
|
.fpu_deactivate = vmx_fpu_deactivate,
|
|
|
|
.tlb_flush = vmx_flush_tlb,
|
|
|
|
.run = vmx_vcpu_run,
|
|
.handle_exit = vmx_handle_exit,
|
|
.skip_emulated_instruction = skip_emulated_instruction,
|
|
.set_interrupt_shadow = vmx_set_interrupt_shadow,
|
|
.get_interrupt_shadow = vmx_get_interrupt_shadow,
|
|
.patch_hypercall = vmx_patch_hypercall,
|
|
.set_irq = vmx_inject_irq,
|
|
.set_nmi = vmx_inject_nmi,
|
|
.queue_exception = vmx_queue_exception,
|
|
.cancel_injection = vmx_cancel_injection,
|
|
.interrupt_allowed = vmx_interrupt_allowed,
|
|
.nmi_allowed = vmx_nmi_allowed,
|
|
.get_nmi_mask = vmx_get_nmi_mask,
|
|
.set_nmi_mask = vmx_set_nmi_mask,
|
|
.enable_nmi_window = enable_nmi_window,
|
|
.enable_irq_window = enable_irq_window,
|
|
.update_cr8_intercept = update_cr8_intercept,
|
|
|
|
.set_tss_addr = vmx_set_tss_addr,
|
|
.get_tdp_level = get_ept_level,
|
|
.get_mt_mask = vmx_get_mt_mask,
|
|
|
|
.get_exit_info = vmx_get_exit_info,
|
|
|
|
.get_lpage_level = vmx_get_lpage_level,
|
|
|
|
.cpuid_update = vmx_cpuid_update,
|
|
|
|
.rdtscp_supported = vmx_rdtscp_supported,
|
|
|
|
.set_supported_cpuid = vmx_set_supported_cpuid,
|
|
|
|
.has_wbinvd_exit = cpu_has_vmx_wbinvd_exit,
|
|
|
|
.set_tsc_khz = vmx_set_tsc_khz,
|
|
.write_tsc_offset = vmx_write_tsc_offset,
|
|
.adjust_tsc_offset = vmx_adjust_tsc_offset,
|
|
.compute_tsc_offset = vmx_compute_tsc_offset,
|
|
.read_l1_tsc = vmx_read_l1_tsc,
|
|
|
|
.set_tdp_cr3 = vmx_set_cr3,
|
|
|
|
.check_intercept = vmx_check_intercept,
|
|
};
|
|
|
|
static int __init vmx_init(void)
|
|
{
|
|
int r, i;
|
|
|
|
rdmsrl_safe(MSR_EFER, &host_efer);
|
|
|
|
for (i = 0; i < NR_VMX_MSR; ++i)
|
|
kvm_define_shared_msr(i, vmx_msr_index[i]);
|
|
|
|
vmx_io_bitmap_a = (unsigned long *)__get_free_page(GFP_KERNEL);
|
|
if (!vmx_io_bitmap_a)
|
|
return -ENOMEM;
|
|
|
|
vmx_io_bitmap_b = (unsigned long *)__get_free_page(GFP_KERNEL);
|
|
if (!vmx_io_bitmap_b) {
|
|
r = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
vmx_msr_bitmap_legacy = (unsigned long *)__get_free_page(GFP_KERNEL);
|
|
if (!vmx_msr_bitmap_legacy) {
|
|
r = -ENOMEM;
|
|
goto out1;
|
|
}
|
|
|
|
vmx_msr_bitmap_longmode = (unsigned long *)__get_free_page(GFP_KERNEL);
|
|
if (!vmx_msr_bitmap_longmode) {
|
|
r = -ENOMEM;
|
|
goto out2;
|
|
}
|
|
|
|
/*
|
|
* Allow direct access to the PC debug port (it is often used for I/O
|
|
* delays, but the vmexits simply slow things down).
|
|
*/
|
|
memset(vmx_io_bitmap_a, 0xff, PAGE_SIZE);
|
|
clear_bit(0x80, vmx_io_bitmap_a);
|
|
|
|
memset(vmx_io_bitmap_b, 0xff, PAGE_SIZE);
|
|
|
|
memset(vmx_msr_bitmap_legacy, 0xff, PAGE_SIZE);
|
|
memset(vmx_msr_bitmap_longmode, 0xff, PAGE_SIZE);
|
|
|
|
set_bit(0, vmx_vpid_bitmap); /* 0 is reserved for host */
|
|
|
|
r = kvm_init(&vmx_x86_ops, sizeof(struct vcpu_vmx),
|
|
__alignof__(struct vcpu_vmx), THIS_MODULE);
|
|
if (r)
|
|
goto out3;
|
|
|
|
vmx_disable_intercept_for_msr(MSR_FS_BASE, false);
|
|
vmx_disable_intercept_for_msr(MSR_GS_BASE, false);
|
|
vmx_disable_intercept_for_msr(MSR_KERNEL_GS_BASE, true);
|
|
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_CS, false);
|
|
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_ESP, false);
|
|
vmx_disable_intercept_for_msr(MSR_IA32_SYSENTER_EIP, false);
|
|
|
|
if (enable_ept) {
|
|
kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
|
|
VMX_EPT_EXECUTABLE_MASK);
|
|
ept_set_mmio_spte_mask();
|
|
kvm_enable_tdp();
|
|
} else
|
|
kvm_disable_tdp();
|
|
|
|
return 0;
|
|
|
|
out3:
|
|
free_page((unsigned long)vmx_msr_bitmap_longmode);
|
|
out2:
|
|
free_page((unsigned long)vmx_msr_bitmap_legacy);
|
|
out1:
|
|
free_page((unsigned long)vmx_io_bitmap_b);
|
|
out:
|
|
free_page((unsigned long)vmx_io_bitmap_a);
|
|
return r;
|
|
}
|
|
|
|
static void __exit vmx_exit(void)
|
|
{
|
|
free_page((unsigned long)vmx_msr_bitmap_legacy);
|
|
free_page((unsigned long)vmx_msr_bitmap_longmode);
|
|
free_page((unsigned long)vmx_io_bitmap_b);
|
|
free_page((unsigned long)vmx_io_bitmap_a);
|
|
|
|
kvm_exit();
|
|
}
|
|
|
|
module_init(vmx_init)
|
|
module_exit(vmx_exit)
|