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linux/arch/x86/kvm/x86.c
Paolo Bonzini 4a1e10d5b5 KVM: x86: handle hardware breakpoints during emulation 
This lets debugging work better during emulation of invalid
guest state.

The check is done before emulating the instruction, and (in the case
of guest debugging) reuses EMULATE_DO_MMIO to exit with KVM_EXIT_DEBUG.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-07-29 09:01:14 +02:00

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/*
* Kernel-based Virtual Machine driver for Linux
*
* derived from drivers/kvm/kvm_main.c
*
* Copyright (C) 2006 Qumranet, Inc.
* Copyright (C) 2008 Qumranet, Inc.
* Copyright IBM Corporation, 2008
* Copyright 2010 Red Hat, Inc. and/or its affiliates.
*
* Authors:
* Avi Kivity <avi@qumranet.com>
* Yaniv Kamay <yaniv@qumranet.com>
* Amit Shah <amit.shah@qumranet.com>
* Ben-Ami Yassour <benami@il.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/
#include <linux/kvm_host.h>
#include "irq.h"
#include "mmu.h"
#include "i8254.h"
#include "tss.h"
#include "kvm_cache_regs.h"
#include "x86.h"
#include "cpuid.h"
#include <linux/clocksource.h>
#include <linux/interrupt.h>
#include <linux/kvm.h>
#include <linux/fs.h>
#include <linux/vmalloc.h>
#include <linux/module.h>
#include <linux/mman.h>
#include <linux/highmem.h>
#include <linux/iommu.h>
#include <linux/intel-iommu.h>
#include <linux/cpufreq.h>
#include <linux/user-return-notifier.h>
#include <linux/srcu.h>
#include <linux/slab.h>
#include <linux/perf_event.h>
#include <linux/uaccess.h>
#include <linux/hash.h>
#include <linux/pci.h>
#include <linux/timekeeper_internal.h>
#include <linux/pvclock_gtod.h>
#include <trace/events/kvm.h>
#define CREATE_TRACE_POINTS
#include "trace.h"
#include <asm/debugreg.h>
#include <asm/msr.h>
#include <asm/desc.h>
#include <asm/mtrr.h>
#include <asm/mce.h>
#include <asm/i387.h>
#include <asm/fpu-internal.h> /* Ugh! */
#include <asm/xcr.h>
#include <asm/pvclock.h>
#include <asm/div64.h>
#define MAX_IO_MSRS 256
#define KVM_MAX_MCE_BANKS 32
#define KVM_MCE_CAP_SUPPORTED (MCG_CTL_P | MCG_SER_P)
#define emul_to_vcpu(ctxt) \
container_of(ctxt, struct kvm_vcpu, arch.emulate_ctxt)
/* EFER defaults:
* - enable syscall per default because its emulated by KVM
* - enable LME and LMA per default on 64 bit KVM
*/
#ifdef CONFIG_X86_64
static
u64 __read_mostly efer_reserved_bits = ~((u64)(EFER_SCE | EFER_LME | EFER_LMA));
#else
static u64 __read_mostly efer_reserved_bits = ~((u64)EFER_SCE);
#endif
#define VM_STAT(x) offsetof(struct kvm, stat.x), KVM_STAT_VM
#define VCPU_STAT(x) offsetof(struct kvm_vcpu, stat.x), KVM_STAT_VCPU
static void update_cr8_intercept(struct kvm_vcpu *vcpu);
static void process_nmi(struct kvm_vcpu *vcpu);
struct kvm_x86_ops *kvm_x86_ops;
EXPORT_SYMBOL_GPL(kvm_x86_ops);
static bool ignore_msrs = 0;
module_param(ignore_msrs, bool, S_IRUGO | S_IWUSR);
bool kvm_has_tsc_control;
EXPORT_SYMBOL_GPL(kvm_has_tsc_control);
u32 kvm_max_guest_tsc_khz;
EXPORT_SYMBOL_GPL(kvm_max_guest_tsc_khz);
/* tsc tolerance in parts per million - default to 1/2 of the NTP threshold */
static u32 tsc_tolerance_ppm = 250;
module_param(tsc_tolerance_ppm, uint, S_IRUGO | S_IWUSR);
#define KVM_NR_SHARED_MSRS 16
struct kvm_shared_msrs_global {
int nr;
u32 msrs[KVM_NR_SHARED_MSRS];
};
struct kvm_shared_msrs {
struct user_return_notifier urn;
bool registered;
struct kvm_shared_msr_values {
u64 host;
u64 curr;
} values[KVM_NR_SHARED_MSRS];
};
static struct kvm_shared_msrs_global __read_mostly shared_msrs_global;
static struct kvm_shared_msrs __percpu *shared_msrs;
struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "pf_fixed", VCPU_STAT(pf_fixed) },
{ "pf_guest", VCPU_STAT(pf_guest) },
{ "tlb_flush", VCPU_STAT(tlb_flush) },
{ "invlpg", VCPU_STAT(invlpg) },
{ "exits", VCPU_STAT(exits) },
{ "io_exits", VCPU_STAT(io_exits) },
{ "mmio_exits", VCPU_STAT(mmio_exits) },
{ "signal_exits", VCPU_STAT(signal_exits) },
{ "irq_window", VCPU_STAT(irq_window_exits) },
{ "nmi_window", VCPU_STAT(nmi_window_exits) },
{ "halt_exits", VCPU_STAT(halt_exits) },
{ "halt_wakeup", VCPU_STAT(halt_wakeup) },
{ "hypercalls", VCPU_STAT(hypercalls) },
{ "request_irq", VCPU_STAT(request_irq_exits) },
{ "irq_exits", VCPU_STAT(irq_exits) },
{ "host_state_reload", VCPU_STAT(host_state_reload) },
{ "efer_reload", VCPU_STAT(efer_reload) },
{ "fpu_reload", VCPU_STAT(fpu_reload) },
{ "insn_emulation", VCPU_STAT(insn_emulation) },
{ "insn_emulation_fail", VCPU_STAT(insn_emulation_fail) },
{ "irq_injections", VCPU_STAT(irq_injections) },
{ "nmi_injections", VCPU_STAT(nmi_injections) },
{ "mmu_shadow_zapped", VM_STAT(mmu_shadow_zapped) },
{ "mmu_pte_write", VM_STAT(mmu_pte_write) },
{ "mmu_pte_updated", VM_STAT(mmu_pte_updated) },
{ "mmu_pde_zapped", VM_STAT(mmu_pde_zapped) },
{ "mmu_flooded", VM_STAT(mmu_flooded) },
{ "mmu_recycled", VM_STAT(mmu_recycled) },
{ "mmu_cache_miss", VM_STAT(mmu_cache_miss) },
{ "mmu_unsync", VM_STAT(mmu_unsync) },
{ "remote_tlb_flush", VM_STAT(remote_tlb_flush) },
{ "largepages", VM_STAT(lpages) },
{ NULL }
};
u64 __read_mostly host_xcr0;
static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt);
static inline void kvm_async_pf_hash_reset(struct kvm_vcpu *vcpu)
{
int i;
for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU); i++)
vcpu->arch.apf.gfns[i] = ~0;
}
static void kvm_on_user_return(struct user_return_notifier *urn)
{
unsigned slot;
struct kvm_shared_msrs *locals
= container_of(urn, struct kvm_shared_msrs, urn);
struct kvm_shared_msr_values *values;
for (slot = 0; slot < shared_msrs_global.nr; ++slot) {
values = &locals->values[slot];
if (values->host != values->curr) {
wrmsrl(shared_msrs_global.msrs[slot], values->host);
values->curr = values->host;
}
}
locals->registered = false;
user_return_notifier_unregister(urn);
}
static void shared_msr_update(unsigned slot, u32 msr)
{
u64 value;
unsigned int cpu = smp_processor_id();
struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
/* only read, and nobody should modify it at this time,
* so don't need lock */
if (slot >= shared_msrs_global.nr) {
printk(KERN_ERR "kvm: invalid MSR slot!");
return;
}
rdmsrl_safe(msr, &value);
smsr->values[slot].host = value;
smsr->values[slot].curr = value;
}
void kvm_define_shared_msr(unsigned slot, u32 msr)
{
if (slot >= shared_msrs_global.nr)
shared_msrs_global.nr = slot + 1;
shared_msrs_global.msrs[slot] = msr;
/* we need ensured the shared_msr_global have been updated */
smp_wmb();
}
EXPORT_SYMBOL_GPL(kvm_define_shared_msr);
static void kvm_shared_msr_cpu_online(void)
{
unsigned i;
for (i = 0; i < shared_msrs_global.nr; ++i)
shared_msr_update(i, shared_msrs_global.msrs[i]);
}
void kvm_set_shared_msr(unsigned slot, u64 value, u64 mask)
{
unsigned int cpu = smp_processor_id();
struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
if (((value ^ smsr->values[slot].curr) & mask) == 0)
return;
smsr->values[slot].curr = value;
wrmsrl(shared_msrs_global.msrs[slot], value);
if (!smsr->registered) {
smsr->urn.on_user_return = kvm_on_user_return;
user_return_notifier_register(&smsr->urn);
smsr->registered = true;
}
}
EXPORT_SYMBOL_GPL(kvm_set_shared_msr);
static void drop_user_return_notifiers(void *ignore)
{
unsigned int cpu = smp_processor_id();
struct kvm_shared_msrs *smsr = per_cpu_ptr(shared_msrs, cpu);
if (smsr->registered)
kvm_on_user_return(&smsr->urn);
}
u64 kvm_get_apic_base(struct kvm_vcpu *vcpu)
{
return vcpu->arch.apic_base;
}
EXPORT_SYMBOL_GPL(kvm_get_apic_base);
void kvm_set_apic_base(struct kvm_vcpu *vcpu, u64 data)
{
/* TODO: reserve bits check */
kvm_lapic_set_base(vcpu, data);
}
EXPORT_SYMBOL_GPL(kvm_set_apic_base);
asmlinkage void kvm_spurious_fault(void)
{
/* Fault while not rebooting. We want the trace. */
BUG();
}
EXPORT_SYMBOL_GPL(kvm_spurious_fault);
#define EXCPT_BENIGN 0
#define EXCPT_CONTRIBUTORY 1
#define EXCPT_PF 2
static int exception_class(int vector)
{
switch (vector) {
case PF_VECTOR:
return EXCPT_PF;
case DE_VECTOR:
case TS_VECTOR:
case NP_VECTOR:
case SS_VECTOR:
case GP_VECTOR:
return EXCPT_CONTRIBUTORY;
default:
break;
}
return EXCPT_BENIGN;
}
static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
unsigned nr, bool has_error, u32 error_code,
bool reinject)
{
u32 prev_nr;
int class1, class2;
kvm_make_request(KVM_REQ_EVENT, vcpu);
if (!vcpu->arch.exception.pending) {
queue:
vcpu->arch.exception.pending = true;
vcpu->arch.exception.has_error_code = has_error;
vcpu->arch.exception.nr = nr;
vcpu->arch.exception.error_code = error_code;
vcpu->arch.exception.reinject = reinject;
return;
}
/* to check exception */
prev_nr = vcpu->arch.exception.nr;
if (prev_nr == DF_VECTOR) {
/* triple fault -> shutdown */
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return;
}
class1 = exception_class(prev_nr);
class2 = exception_class(nr);
if ((class1 == EXCPT_CONTRIBUTORY && class2 == EXCPT_CONTRIBUTORY)
|| (class1 == EXCPT_PF && class2 != EXCPT_BENIGN)) {
/* generate double fault per SDM Table 5-5 */
vcpu->arch.exception.pending = true;
vcpu->arch.exception.has_error_code = true;
vcpu->arch.exception.nr = DF_VECTOR;
vcpu->arch.exception.error_code = 0;
} else
/* replace previous exception with a new one in a hope
that instruction re-execution will regenerate lost
exception */
goto queue;
}
void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
{
kvm_multiple_exception(vcpu, nr, false, 0, false);
}
EXPORT_SYMBOL_GPL(kvm_queue_exception);
void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
{
kvm_multiple_exception(vcpu, nr, false, 0, true);
}
EXPORT_SYMBOL_GPL(kvm_requeue_exception);
void kvm_complete_insn_gp(struct kvm_vcpu *vcpu, int err)
{
if (err)
kvm_inject_gp(vcpu, 0);
else
kvm_x86_ops->skip_emulated_instruction(vcpu);
}
EXPORT_SYMBOL_GPL(kvm_complete_insn_gp);
void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
{
++vcpu->stat.pf_guest;
vcpu->arch.cr2 = fault->address;
kvm_queue_exception_e(vcpu, PF_VECTOR, fault->error_code);
}
EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
void kvm_propagate_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
{
if (mmu_is_nested(vcpu) && !fault->nested_page_fault)
vcpu->arch.nested_mmu.inject_page_fault(vcpu, fault);
else
vcpu->arch.mmu.inject_page_fault(vcpu, fault);
}
void kvm_inject_nmi(struct kvm_vcpu *vcpu)
{
atomic_inc(&vcpu->arch.nmi_queued);
kvm_make_request(KVM_REQ_NMI, vcpu);
}
EXPORT_SYMBOL_GPL(kvm_inject_nmi);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
{
kvm_multiple_exception(vcpu, nr, true, error_code, false);
}
EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
{
kvm_multiple_exception(vcpu, nr, true, error_code, true);
}
EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);
/*
* Checks if cpl <= required_cpl; if true, return true. Otherwise queue
* a #GP and return false.
*/
bool kvm_require_cpl(struct kvm_vcpu *vcpu, int required_cpl)
{
if (kvm_x86_ops->get_cpl(vcpu) <= required_cpl)
return true;
kvm_queue_exception_e(vcpu, GP_VECTOR, 0);
return false;
}
EXPORT_SYMBOL_GPL(kvm_require_cpl);
/*
* This function will be used to read from the physical memory of the currently
* running guest. The difference to kvm_read_guest_page is that this function
* can read from guest physical or from the guest's guest physical memory.
*/
int kvm_read_guest_page_mmu(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu,
gfn_t ngfn, void *data, int offset, int len,
u32 access)
{
gfn_t real_gfn;
gpa_t ngpa;
ngpa = gfn_to_gpa(ngfn);
real_gfn = mmu->translate_gpa(vcpu, ngpa, access);
if (real_gfn == UNMAPPED_GVA)
return -EFAULT;
real_gfn = gpa_to_gfn(real_gfn);
return kvm_read_guest_page(vcpu->kvm, real_gfn, data, offset, len);
}
EXPORT_SYMBOL_GPL(kvm_read_guest_page_mmu);
int kvm_read_nested_guest_page(struct kvm_vcpu *vcpu, gfn_t gfn,
void *data, int offset, int len, u32 access)
{
return kvm_read_guest_page_mmu(vcpu, vcpu->arch.walk_mmu, gfn,
data, offset, len, access);
}
/*
* Load the pae pdptrs. Return true is they are all valid.
*/
int load_pdptrs(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, unsigned long cr3)
{
gfn_t pdpt_gfn = cr3 >> PAGE_SHIFT;
unsigned offset = ((cr3 & (PAGE_SIZE-1)) >> 5) << 2;
int i;
int ret;
u64 pdpte[ARRAY_SIZE(mmu->pdptrs)];
ret = kvm_read_guest_page_mmu(vcpu, mmu, pdpt_gfn, pdpte,
offset * sizeof(u64), sizeof(pdpte),
PFERR_USER_MASK|PFERR_WRITE_MASK);
if (ret < 0) {
ret = 0;
goto out;
}
for (i = 0; i < ARRAY_SIZE(pdpte); ++i) {
if (is_present_gpte(pdpte[i]) &&
(pdpte[i] & vcpu->arch.mmu.rsvd_bits_mask[0][2])) {
ret = 0;
goto out;
}
}
ret = 1;
memcpy(mmu->pdptrs, pdpte, sizeof(mmu->pdptrs));
__set_bit(VCPU_EXREG_PDPTR,
(unsigned long *)&vcpu->arch.regs_avail);
__set_bit(VCPU_EXREG_PDPTR,
(unsigned long *)&vcpu->arch.regs_dirty);
out:
return ret;
}
EXPORT_SYMBOL_GPL(load_pdptrs);
static bool pdptrs_changed(struct kvm_vcpu *vcpu)
{
u64 pdpte[ARRAY_SIZE(vcpu->arch.walk_mmu->pdptrs)];
bool changed = true;
int offset;
gfn_t gfn;
int r;
if (is_long_mode(vcpu) || !is_pae(vcpu))
return false;
if (!test_bit(VCPU_EXREG_PDPTR,
(unsigned long *)&vcpu->arch.regs_avail))
return true;
gfn = (kvm_read_cr3(vcpu) & ~31u) >> PAGE_SHIFT;
offset = (kvm_read_cr3(vcpu) & ~31u) & (PAGE_SIZE - 1);
r = kvm_read_nested_guest_page(vcpu, gfn, pdpte, offset, sizeof(pdpte),
PFERR_USER_MASK | PFERR_WRITE_MASK);
if (r < 0)
goto out;
changed = memcmp(pdpte, vcpu->arch.walk_mmu->pdptrs, sizeof(pdpte)) != 0;
out:
return changed;
}
int kvm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
{
unsigned long old_cr0 = kvm_read_cr0(vcpu);
unsigned long update_bits = X86_CR0_PG | X86_CR0_WP |
X86_CR0_CD | X86_CR0_NW;
cr0 |= X86_CR0_ET;
#ifdef CONFIG_X86_64
if (cr0 & 0xffffffff00000000UL)
return 1;
#endif
cr0 &= ~CR0_RESERVED_BITS;
if ((cr0 & X86_CR0_NW) && !(cr0 & X86_CR0_CD))
return 1;
if ((cr0 & X86_CR0_PG) && !(cr0 & X86_CR0_PE))
return 1;
if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
#ifdef CONFIG_X86_64
if ((vcpu->arch.efer & EFER_LME)) {
int cs_db, cs_l;
if (!is_pae(vcpu))
return 1;
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
if (cs_l)
return 1;
} else
#endif
if (is_pae(vcpu) && !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
kvm_read_cr3(vcpu)))
return 1;
}
if (!(cr0 & X86_CR0_PG) && kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE))
return 1;
kvm_x86_ops->set_cr0(vcpu, cr0);
if ((cr0 ^ old_cr0) & X86_CR0_PG) {
kvm_clear_async_pf_completion_queue(vcpu);
kvm_async_pf_hash_reset(vcpu);
}
if ((cr0 ^ old_cr0) & update_bits)
kvm_mmu_reset_context(vcpu);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_cr0);
void kvm_lmsw(struct kvm_vcpu *vcpu, unsigned long msw)
{
(void)kvm_set_cr0(vcpu, kvm_read_cr0_bits(vcpu, ~0x0eul) | (msw & 0x0f));
}
EXPORT_SYMBOL_GPL(kvm_lmsw);
static void kvm_load_guest_xcr0(struct kvm_vcpu *vcpu)
{
if (kvm_read_cr4_bits(vcpu, X86_CR4_OSXSAVE) &&
!vcpu->guest_xcr0_loaded) {
/* kvm_set_xcr() also depends on this */
xsetbv(XCR_XFEATURE_ENABLED_MASK, vcpu->arch.xcr0);
vcpu->guest_xcr0_loaded = 1;
}
}
static void kvm_put_guest_xcr0(struct kvm_vcpu *vcpu)
{
if (vcpu->guest_xcr0_loaded) {
if (vcpu->arch.xcr0 != host_xcr0)
xsetbv(XCR_XFEATURE_ENABLED_MASK, host_xcr0);
vcpu->guest_xcr0_loaded = 0;
}
}
int __kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
{
u64 xcr0;
/* Only support XCR_XFEATURE_ENABLED_MASK(xcr0) now */
if (index != XCR_XFEATURE_ENABLED_MASK)
return 1;
xcr0 = xcr;
if (!(xcr0 & XSTATE_FP))
return 1;
if ((xcr0 & XSTATE_YMM) && !(xcr0 & XSTATE_SSE))
return 1;
if (xcr0 & ~host_xcr0)
return 1;
kvm_put_guest_xcr0(vcpu);
vcpu->arch.xcr0 = xcr0;
return 0;
}
int kvm_set_xcr(struct kvm_vcpu *vcpu, u32 index, u64 xcr)
{
if (kvm_x86_ops->get_cpl(vcpu) != 0 ||
__kvm_set_xcr(vcpu, index, xcr)) {
kvm_inject_gp(vcpu, 0);
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_xcr);
int kvm_set_cr4(struct kvm_vcpu *vcpu, unsigned long cr4)
{
unsigned long old_cr4 = kvm_read_cr4(vcpu);
unsigned long pdptr_bits = X86_CR4_PGE | X86_CR4_PSE |
X86_CR4_PAE | X86_CR4_SMEP;
if (cr4 & CR4_RESERVED_BITS)
return 1;
if (!guest_cpuid_has_xsave(vcpu) && (cr4 & X86_CR4_OSXSAVE))
return 1;
if (!guest_cpuid_has_smep(vcpu) && (cr4 & X86_CR4_SMEP))
return 1;
if (!guest_cpuid_has_fsgsbase(vcpu) && (cr4 & X86_CR4_FSGSBASE))
return 1;
if (is_long_mode(vcpu)) {
if (!(cr4 & X86_CR4_PAE))
return 1;
} else if (is_paging(vcpu) && (cr4 & X86_CR4_PAE)
&& ((cr4 ^ old_cr4) & pdptr_bits)
&& !load_pdptrs(vcpu, vcpu->arch.walk_mmu,
kvm_read_cr3(vcpu)))
return 1;
if ((cr4 & X86_CR4_PCIDE) && !(old_cr4 & X86_CR4_PCIDE)) {
if (!guest_cpuid_has_pcid(vcpu))
return 1;
/* PCID can not be enabled when cr3[11:0]!=000H or EFER.LMA=0 */
if ((kvm_read_cr3(vcpu) & X86_CR3_PCID_MASK) || !is_long_mode(vcpu))
return 1;
}
if (kvm_x86_ops->set_cr4(vcpu, cr4))
return 1;
if (((cr4 ^ old_cr4) & pdptr_bits) ||
(!(cr4 & X86_CR4_PCIDE) && (old_cr4 & X86_CR4_PCIDE)))
kvm_mmu_reset_context(vcpu);
if ((cr4 ^ old_cr4) & X86_CR4_OSXSAVE)
kvm_update_cpuid(vcpu);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_cr4);
int kvm_set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
{
if (cr3 == kvm_read_cr3(vcpu) && !pdptrs_changed(vcpu)) {
kvm_mmu_sync_roots(vcpu);
kvm_mmu_flush_tlb(vcpu);
return 0;
}
if (is_long_mode(vcpu)) {
if (kvm_read_cr4_bits(vcpu, X86_CR4_PCIDE)) {
if (cr3 & CR3_PCID_ENABLED_RESERVED_BITS)
return 1;
} else
if (cr3 & CR3_L_MODE_RESERVED_BITS)
return 1;
} else {
if (is_pae(vcpu)) {
if (cr3 & CR3_PAE_RESERVED_BITS)
return 1;
if (is_paging(vcpu) &&
!load_pdptrs(vcpu, vcpu->arch.walk_mmu, cr3))
return 1;
}
/*
* We don't check reserved bits in nonpae mode, because
* this isn't enforced, and VMware depends on this.
*/
}
/*
* Does the new cr3 value map to physical memory? (Note, we
* catch an invalid cr3 even in real-mode, because it would
* cause trouble later on when we turn on paging anyway.)
*
* A real CPU would silently accept an invalid cr3 and would
* attempt to use it - with largely undefined (and often hard
* to debug) behavior on the guest side.
*/
if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
return 1;
vcpu->arch.cr3 = cr3;
__set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
vcpu->arch.mmu.new_cr3(vcpu);
return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_cr3);
int kvm_set_cr8(struct kvm_vcpu *vcpu, unsigned long cr8)
{
if (cr8 & CR8_RESERVED_BITS)
return 1;
if (irqchip_in_kernel(vcpu->kvm))
kvm_lapic_set_tpr(vcpu, cr8);
else
vcpu->arch.cr8 = cr8;
return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_cr8);
unsigned long kvm_get_cr8(struct kvm_vcpu *vcpu)
{
if (irqchip_in_kernel(vcpu->kvm))
return kvm_lapic_get_cr8(vcpu);
else
return vcpu->arch.cr8;
}
EXPORT_SYMBOL_GPL(kvm_get_cr8);
static void kvm_update_dr7(struct kvm_vcpu *vcpu)
{
unsigned long dr7;
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
dr7 = vcpu->arch.guest_debug_dr7;
else
dr7 = vcpu->arch.dr7;
kvm_x86_ops->set_dr7(vcpu, dr7);
vcpu->arch.switch_db_regs = (dr7 & DR7_BP_EN_MASK);
}
static int __kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
{
switch (dr) {
case 0 ... 3:
vcpu->arch.db[dr] = val;
if (!(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP))
vcpu->arch.eff_db[dr] = val;
break;
case 4:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1; /* #UD */
/* fall through */
case 6:
if (val & 0xffffffff00000000ULL)
return -1; /* #GP */
vcpu->arch.dr6 = (val & DR6_VOLATILE) | DR6_FIXED_1;
break;
case 5:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1; /* #UD */
/* fall through */
default: /* 7 */
if (val & 0xffffffff00000000ULL)
return -1; /* #GP */
vcpu->arch.dr7 = (val & DR7_VOLATILE) | DR7_FIXED_1;
kvm_update_dr7(vcpu);
break;
}
return 0;
}
int kvm_set_dr(struct kvm_vcpu *vcpu, int dr, unsigned long val)
{
int res;
res = __kvm_set_dr(vcpu, dr, val);
if (res > 0)
kvm_queue_exception(vcpu, UD_VECTOR);
else if (res < 0)
kvm_inject_gp(vcpu, 0);
return res;
}
EXPORT_SYMBOL_GPL(kvm_set_dr);
static int _kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
{
switch (dr) {
case 0 ... 3:
*val = vcpu->arch.db[dr];
break;
case 4:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1;
/* fall through */
case 6:
*val = vcpu->arch.dr6;
break;
case 5:
if (kvm_read_cr4_bits(vcpu, X86_CR4_DE))
return 1;
/* fall through */
default: /* 7 */
*val = vcpu->arch.dr7;
break;
}
return 0;
}
int kvm_get_dr(struct kvm_vcpu *vcpu, int dr, unsigned long *val)
{
if (_kvm_get_dr(vcpu, dr, val)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 1;
}
return 0;
}
EXPORT_SYMBOL_GPL(kvm_get_dr);
bool kvm_rdpmc(struct kvm_vcpu *vcpu)
{
u32 ecx = kvm_register_read(vcpu, VCPU_REGS_RCX);
u64 data;
int err;
err = kvm_pmu_read_pmc(vcpu, ecx, &data);
if (err)
return err;
kvm_register_write(vcpu, VCPU_REGS_RAX, (u32)data);
kvm_register_write(vcpu, VCPU_REGS_RDX, data >> 32);
return err;
}
EXPORT_SYMBOL_GPL(kvm_rdpmc);
/*
* List of msr numbers which we expose to userspace through KVM_GET_MSRS
* and KVM_SET_MSRS, and KVM_GET_MSR_INDEX_LIST.
*
* This list is modified at module load time to reflect the
* capabilities of the host cpu. This capabilities test skips MSRs that are
* kvm-specific. Those are put in the beginning of the list.
*/
#define KVM_SAVE_MSRS_BEGIN 10
static u32 msrs_to_save[] = {
MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
MSR_KVM_PV_EOI_EN,
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
MSR_STAR,
#ifdef CONFIG_X86_64
MSR_CSTAR, MSR_KERNEL_GS_BASE, MSR_SYSCALL_MASK, MSR_LSTAR,
#endif
MSR_IA32_TSC, MSR_IA32_CR_PAT, MSR_VM_HSAVE_PA,
MSR_IA32_FEATURE_CONTROL
};
static unsigned num_msrs_to_save;
static const u32 emulated_msrs[] = {
MSR_IA32_TSC_ADJUST,
MSR_IA32_TSCDEADLINE,
MSR_IA32_MISC_ENABLE,
MSR_IA32_MCG_STATUS,
MSR_IA32_MCG_CTL,
};
bool kvm_valid_efer(struct kvm_vcpu *vcpu, u64 efer)
{
if (efer & efer_reserved_bits)
return false;
if (efer & EFER_FFXSR) {
struct kvm_cpuid_entry2 *feat;
feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
if (!feat || !(feat->edx & bit(X86_FEATURE_FXSR_OPT)))
return false;
}
if (efer & EFER_SVME) {
struct kvm_cpuid_entry2 *feat;
feat = kvm_find_cpuid_entry(vcpu, 0x80000001, 0);
if (!feat || !(feat->ecx & bit(X86_FEATURE_SVM)))
return false;
}
return true;
}
EXPORT_SYMBOL_GPL(kvm_valid_efer);
static int set_efer(struct kvm_vcpu *vcpu, u64 efer)
{
u64 old_efer = vcpu->arch.efer;
if (!kvm_valid_efer(vcpu, efer))
return 1;
if (is_paging(vcpu)
&& (vcpu->arch.efer & EFER_LME) != (efer & EFER_LME))
return 1;
efer &= ~EFER_LMA;
efer |= vcpu->arch.efer & EFER_LMA;
kvm_x86_ops->set_efer(vcpu, efer);
/* Update reserved bits */
if ((efer ^ old_efer) & EFER_NX)
kvm_mmu_reset_context(vcpu);
return 0;
}
void kvm_enable_efer_bits(u64 mask)
{
efer_reserved_bits &= ~mask;
}
EXPORT_SYMBOL_GPL(kvm_enable_efer_bits);
/*
* Writes msr value into into the appropriate "register".
* Returns 0 on success, non-0 otherwise.
* Assumes vcpu_load() was already called.
*/
int kvm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
{
return kvm_x86_ops->set_msr(vcpu, msr);
}
/*
* Adapt set_msr() to msr_io()'s calling convention
*/
static int do_set_msr(struct kvm_vcpu *vcpu, unsigned index, u64 *data)
{
struct msr_data msr;
msr.data = *data;
msr.index = index;
msr.host_initiated = true;
return kvm_set_msr(vcpu, &msr);
}
#ifdef CONFIG_X86_64
struct pvclock_gtod_data {
seqcount_t seq;
struct { /* extract of a clocksource struct */
int vclock_mode;
cycle_t cycle_last;
cycle_t mask;
u32 mult;
u32 shift;
} clock;
/* open coded 'struct timespec' */
u64 monotonic_time_snsec;
time_t monotonic_time_sec;
};
static struct pvclock_gtod_data pvclock_gtod_data;
static void update_pvclock_gtod(struct timekeeper *tk)
{
struct pvclock_gtod_data *vdata = &pvclock_gtod_data;
write_seqcount_begin(&vdata->seq);
/* copy pvclock gtod data */
vdata->clock.vclock_mode = tk->clock->archdata.vclock_mode;
vdata->clock.cycle_last = tk->clock->cycle_last;
vdata->clock.mask = tk->clock->mask;
vdata->clock.mult = tk->mult;
vdata->clock.shift = tk->shift;
vdata->monotonic_time_sec = tk->xtime_sec
+ tk->wall_to_monotonic.tv_sec;
vdata->monotonic_time_snsec = tk->xtime_nsec
+ (tk->wall_to_monotonic.tv_nsec
<< tk->shift);
while (vdata->monotonic_time_snsec >=
(((u64)NSEC_PER_SEC) << tk->shift)) {
vdata->monotonic_time_snsec -=
((u64)NSEC_PER_SEC) << tk->shift;
vdata->monotonic_time_sec++;
}
write_seqcount_end(&vdata->seq);
}
#endif
static void kvm_write_wall_clock(struct kvm *kvm, gpa_t wall_clock)
{
int version;
int r;
struct pvclock_wall_clock wc;
struct timespec boot;
if (!wall_clock)
return;
r = kvm_read_guest(kvm, wall_clock, &version, sizeof(version));
if (r)
return;
if (version & 1)
++version; /* first time write, random junk */
++version;
kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
/*
* The guest calculates current wall clock time by adding
* system time (updated by kvm_guest_time_update below) to the
* wall clock specified here. guest system time equals host
* system time for us, thus we must fill in host boot time here.
*/
getboottime(&boot);
if (kvm->arch.kvmclock_offset) {
struct timespec ts = ns_to_timespec(kvm->arch.kvmclock_offset);
boot = timespec_sub(boot, ts);
}
wc.sec = boot.tv_sec;
wc.nsec = boot.tv_nsec;
wc.version = version;
kvm_write_guest(kvm, wall_clock, &wc, sizeof(wc));
version++;
kvm_write_guest(kvm, wall_clock, &version, sizeof(version));
}
static uint32_t div_frac(uint32_t dividend, uint32_t divisor)
{
uint32_t quotient, remainder;
/* Don't try to replace with do_div(), this one calculates
* "(dividend << 32) / divisor" */
__asm__ ( "divl %4"
: "=a" (quotient), "=d" (remainder)
: "0" (0), "1" (dividend), "r" (divisor) );
return quotient;
}
static void kvm_get_time_scale(uint32_t scaled_khz, uint32_t base_khz,
s8 *pshift, u32 *pmultiplier)
{
uint64_t scaled64;
int32_t shift = 0;
uint64_t tps64;
uint32_t tps32;
tps64 = base_khz * 1000LL;
scaled64 = scaled_khz * 1000LL;
while (tps64 > scaled64*2 || tps64 & 0xffffffff00000000ULL) {
tps64 >>= 1;
shift--;
}
tps32 = (uint32_t)tps64;
while (tps32 <= scaled64 || scaled64 & 0xffffffff00000000ULL) {
if (scaled64 & 0xffffffff00000000ULL || tps32 & 0x80000000)
scaled64 >>= 1;
else
tps32 <<= 1;
shift++;
}
*pshift = shift;
*pmultiplier = div_frac(scaled64, tps32);
pr_debug("%s: base_khz %u => %u, shift %d, mul %u\n",
__func__, base_khz, scaled_khz, shift, *pmultiplier);
}
static inline u64 get_kernel_ns(void)
{
struct timespec ts;
WARN_ON(preemptible());
ktime_get_ts(&ts);
monotonic_to_bootbased(&ts);
return timespec_to_ns(&ts);
}
#ifdef CONFIG_X86_64
static atomic_t kvm_guest_has_master_clock = ATOMIC_INIT(0);
#endif
static DEFINE_PER_CPU(unsigned long, cpu_tsc_khz);
unsigned long max_tsc_khz;
static inline u64 nsec_to_cycles(struct kvm_vcpu *vcpu, u64 nsec)
{
return pvclock_scale_delta(nsec, vcpu->arch.virtual_tsc_mult,
vcpu->arch.virtual_tsc_shift);
}
static u32 adjust_tsc_khz(u32 khz, s32 ppm)
{
u64 v = (u64)khz * (1000000 + ppm);
do_div(v, 1000000);
return v;
}
static void kvm_set_tsc_khz(struct kvm_vcpu *vcpu, u32 this_tsc_khz)
{
u32 thresh_lo, thresh_hi;
int use_scaling = 0;
/* tsc_khz can be zero if TSC calibration fails */
if (this_tsc_khz == 0)
return;
/* Compute a scale to convert nanoseconds in TSC cycles */
kvm_get_time_scale(this_tsc_khz, NSEC_PER_SEC / 1000,
&vcpu->arch.virtual_tsc_shift,
&vcpu->arch.virtual_tsc_mult);
vcpu->arch.virtual_tsc_khz = this_tsc_khz;
/*
* Compute the variation in TSC rate which is acceptable
* within the range of tolerance and decide if the
* rate being applied is within that bounds of the hardware
* rate. If so, no scaling or compensation need be done.
*/
thresh_lo = adjust_tsc_khz(tsc_khz, -tsc_tolerance_ppm);
thresh_hi = adjust_tsc_khz(tsc_khz, tsc_tolerance_ppm);
if (this_tsc_khz < thresh_lo || this_tsc_khz > thresh_hi) {
pr_debug("kvm: requested TSC rate %u falls outside tolerance [%u,%u]\n", this_tsc_khz, thresh_lo, thresh_hi);
use_scaling = 1;
}
kvm_x86_ops->set_tsc_khz(vcpu, this_tsc_khz, use_scaling);
}
static u64 compute_guest_tsc(struct kvm_vcpu *vcpu, s64 kernel_ns)
{
u64 tsc = pvclock_scale_delta(kernel_ns-vcpu->arch.this_tsc_nsec,
vcpu->arch.virtual_tsc_mult,
vcpu->arch.virtual_tsc_shift);
tsc += vcpu->arch.this_tsc_write;
return tsc;
}
void kvm_track_tsc_matching(struct kvm_vcpu *vcpu)
{
#ifdef CONFIG_X86_64
bool vcpus_matched;
bool do_request = false;
struct kvm_arch *ka = &vcpu->kvm->arch;
struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
atomic_read(&vcpu->kvm->online_vcpus));
if (vcpus_matched && gtod->clock.vclock_mode == VCLOCK_TSC)
if (!ka->use_master_clock)
do_request = 1;
if (!vcpus_matched && ka->use_master_clock)
do_request = 1;
if (do_request)
kvm_make_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu);
trace_kvm_track_tsc(vcpu->vcpu_id, ka->nr_vcpus_matched_tsc,
atomic_read(&vcpu->kvm->online_vcpus),
ka->use_master_clock, gtod->clock.vclock_mode);
#endif
}
static void update_ia32_tsc_adjust_msr(struct kvm_vcpu *vcpu, s64 offset)
{
u64 curr_offset = kvm_x86_ops->read_tsc_offset(vcpu);
vcpu->arch.ia32_tsc_adjust_msr += offset - curr_offset;
}
void kvm_write_tsc(struct kvm_vcpu *vcpu, struct msr_data *msr)
{
struct kvm *kvm = vcpu->kvm;
u64 offset, ns, elapsed;
unsigned long flags;
s64 usdiff;
bool matched;
u64 data = msr->data;
raw_spin_lock_irqsave(&kvm->arch.tsc_write_lock, flags);
offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
ns = get_kernel_ns();
elapsed = ns - kvm->arch.last_tsc_nsec;
if (vcpu->arch.virtual_tsc_khz) {
int faulted = 0;
/* n.b - signed multiplication and division required */
usdiff = data - kvm->arch.last_tsc_write;
#ifdef CONFIG_X86_64
usdiff = (usdiff * 1000) / vcpu->arch.virtual_tsc_khz;
#else
/* do_div() only does unsigned */
asm("1: idivl %[divisor]\n"
"2: xor %%edx, %%edx\n"
" movl $0, %[faulted]\n"
"3:\n"
".section .fixup,\"ax\"\n"
"4: movl $1, %[faulted]\n"
" jmp 3b\n"
".previous\n"
_ASM_EXTABLE(1b, 4b)
: "=A"(usdiff), [faulted] "=r" (faulted)
: "A"(usdiff * 1000), [divisor] "rm"(vcpu->arch.virtual_tsc_khz));
#endif
do_div(elapsed, 1000);
usdiff -= elapsed;
if (usdiff < 0)
usdiff = -usdiff;
/* idivl overflow => difference is larger than USEC_PER_SEC */
if (faulted)
usdiff = USEC_PER_SEC;
} else
usdiff = USEC_PER_SEC; /* disable TSC match window below */
/*
* Special case: TSC write with a small delta (1 second) of virtual
* cycle time against real time is interpreted as an attempt to
* synchronize the CPU.
*
* For a reliable TSC, we can match TSC offsets, and for an unstable
* TSC, we add elapsed time in this computation. We could let the
* compensation code attempt to catch up if we fall behind, but
* it's better to try to match offsets from the beginning.
*/
if (usdiff < USEC_PER_SEC &&
vcpu->arch.virtual_tsc_khz == kvm->arch.last_tsc_khz) {
if (!check_tsc_unstable()) {
offset = kvm->arch.cur_tsc_offset;
pr_debug("kvm: matched tsc offset for %llu\n", data);
} else {
u64 delta = nsec_to_cycles(vcpu, elapsed);
data += delta;
offset = kvm_x86_ops->compute_tsc_offset(vcpu, data);
pr_debug("kvm: adjusted tsc offset by %llu\n", delta);
}
matched = true;
} else {
/*
* We split periods of matched TSC writes into generations.
* For each generation, we track the original measured
* nanosecond time, offset, and write, so if TSCs are in
* sync, we can match exact offset, and if not, we can match
* exact software computation in compute_guest_tsc()
*
* These values are tracked in kvm->arch.cur_xxx variables.
*/
kvm->arch.cur_tsc_generation++;
kvm->arch.cur_tsc_nsec = ns;
kvm->arch.cur_tsc_write = data;
kvm->arch.cur_tsc_offset = offset;
matched = false;
pr_debug("kvm: new tsc generation %u, clock %llu\n",
kvm->arch.cur_tsc_generation, data);
}
/*
* We also track th most recent recorded KHZ, write and time to
* allow the matching interval to be extended at each write.
*/
kvm->arch.last_tsc_nsec = ns;
kvm->arch.last_tsc_write = data;
kvm->arch.last_tsc_khz = vcpu->arch.virtual_tsc_khz;
/* Reset of TSC must disable overshoot protection below */
vcpu->arch.hv_clock.tsc_timestamp = 0;
vcpu->arch.last_guest_tsc = data;
/* Keep track of which generation this VCPU has synchronized to */
vcpu->arch.this_tsc_generation = kvm->arch.cur_tsc_generation;
vcpu->arch.this_tsc_nsec = kvm->arch.cur_tsc_nsec;
vcpu->arch.this_tsc_write = kvm->arch.cur_tsc_write;
if (guest_cpuid_has_tsc_adjust(vcpu) && !msr->host_initiated)
update_ia32_tsc_adjust_msr(vcpu, offset);
kvm_x86_ops->write_tsc_offset(vcpu, offset);
raw_spin_unlock_irqrestore(&kvm->arch.tsc_write_lock, flags);
spin_lock(&kvm->arch.pvclock_gtod_sync_lock);
if (matched)
kvm->arch.nr_vcpus_matched_tsc++;
else
kvm->arch.nr_vcpus_matched_tsc = 0;
kvm_track_tsc_matching(vcpu);
spin_unlock(&kvm->arch.pvclock_gtod_sync_lock);
}
EXPORT_SYMBOL_GPL(kvm_write_tsc);
#ifdef CONFIG_X86_64
static cycle_t read_tsc(void)
{
cycle_t ret;
u64 last;
/*
* Empirically, a fence (of type that depends on the CPU)
* before rdtsc is enough to ensure that rdtsc is ordered
* with respect to loads. The various CPU manuals are unclear
* as to whether rdtsc can be reordered with later loads,
* but no one has ever seen it happen.
*/
rdtsc_barrier();
ret = (cycle_t)vget_cycles();
last = pvclock_gtod_data.clock.cycle_last;
if (likely(ret >= last))
return ret;
/*
* GCC likes to generate cmov here, but this branch is extremely
* predictable (it's just a funciton of time and the likely is
* very likely) and there's a data dependence, so force GCC
* to generate a branch instead. I don't barrier() because
* we don't actually need a barrier, and if this function
* ever gets inlined it will generate worse code.
*/
asm volatile ("");
return last;
}
static inline u64 vgettsc(cycle_t *cycle_now)
{
long v;
struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
*cycle_now = read_tsc();
v = (*cycle_now - gtod->clock.cycle_last) & gtod->clock.mask;
return v * gtod->clock.mult;
}
static int do_monotonic(struct timespec *ts, cycle_t *cycle_now)
{
unsigned long seq;
u64 ns;
int mode;
struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
ts->tv_nsec = 0;
do {
seq = read_seqcount_begin(&gtod->seq);
mode = gtod->clock.vclock_mode;
ts->tv_sec = gtod->monotonic_time_sec;
ns = gtod->monotonic_time_snsec;
ns += vgettsc(cycle_now);
ns >>= gtod->clock.shift;
} while (unlikely(read_seqcount_retry(&gtod->seq, seq)));
timespec_add_ns(ts, ns);
return mode;
}
/* returns true if host is using tsc clocksource */
static bool kvm_get_time_and_clockread(s64 *kernel_ns, cycle_t *cycle_now)
{
struct timespec ts;
/* checked again under seqlock below */
if (pvclock_gtod_data.clock.vclock_mode != VCLOCK_TSC)
return false;
if (do_monotonic(&ts, cycle_now) != VCLOCK_TSC)
return false;
monotonic_to_bootbased(&ts);
*kernel_ns = timespec_to_ns(&ts);
return true;
}
#endif
/*
*
* Assuming a stable TSC across physical CPUS, and a stable TSC
* across virtual CPUs, the following condition is possible.
* Each numbered line represents an event visible to both
* CPUs at the next numbered event.
*
* "timespecX" represents host monotonic time. "tscX" represents
* RDTSC value.
*
* VCPU0 on CPU0 | VCPU1 on CPU1
*
* 1. read timespec0,tsc0
* 2. | timespec1 = timespec0 + N
* | tsc1 = tsc0 + M
* 3. transition to guest | transition to guest
* 4. ret0 = timespec0 + (rdtsc - tsc0) |
* 5. | ret1 = timespec1 + (rdtsc - tsc1)
* | ret1 = timespec0 + N + (rdtsc - (tsc0 + M))
*
* Since ret0 update is visible to VCPU1 at time 5, to obey monotonicity:
*
* - ret0 < ret1
* - timespec0 + (rdtsc - tsc0) < timespec0 + N + (rdtsc - (tsc0 + M))
* ...
* - 0 < N - M => M < N
*
* That is, when timespec0 != timespec1, M < N. Unfortunately that is not
* always the case (the difference between two distinct xtime instances
* might be smaller then the difference between corresponding TSC reads,
* when updating guest vcpus pvclock areas).
*
* To avoid that problem, do not allow visibility of distinct
* system_timestamp/tsc_timestamp values simultaneously: use a master
* copy of host monotonic time values. Update that master copy
* in lockstep.
*
* Rely on synchronization of host TSCs and guest TSCs for monotonicity.
*
*/
static void pvclock_update_vm_gtod_copy(struct kvm *kvm)
{
#ifdef CONFIG_X86_64
struct kvm_arch *ka = &kvm->arch;
int vclock_mode;
bool host_tsc_clocksource, vcpus_matched;
vcpus_matched = (ka->nr_vcpus_matched_tsc + 1 ==
atomic_read(&kvm->online_vcpus));
/*
* If the host uses TSC clock, then passthrough TSC as stable
* to the guest.
*/
host_tsc_clocksource = kvm_get_time_and_clockread(
&ka->master_kernel_ns,
&ka->master_cycle_now);
ka->use_master_clock = host_tsc_clocksource & vcpus_matched;
if (ka->use_master_clock)
atomic_set(&kvm_guest_has_master_clock, 1);
vclock_mode = pvclock_gtod_data.clock.vclock_mode;
trace_kvm_update_master_clock(ka->use_master_clock, vclock_mode,
vcpus_matched);
#endif
}
static int kvm_guest_time_update(struct kvm_vcpu *v)
{
unsigned long flags, this_tsc_khz;
struct kvm_vcpu_arch *vcpu = &v->arch;
struct kvm_arch *ka = &v->kvm->arch;
s64 kernel_ns, max_kernel_ns;
u64 tsc_timestamp, host_tsc;
struct pvclock_vcpu_time_info guest_hv_clock;
u8 pvclock_flags;
bool use_master_clock;
kernel_ns = 0;
host_tsc = 0;
/*
* If the host uses TSC clock, then passthrough TSC as stable
* to the guest.
*/
spin_lock(&ka->pvclock_gtod_sync_lock);
use_master_clock = ka->use_master_clock;
if (use_master_clock) {
host_tsc = ka->master_cycle_now;
kernel_ns = ka->master_kernel_ns;
}
spin_unlock(&ka->pvclock_gtod_sync_lock);
/* Keep irq disabled to prevent changes to the clock */
local_irq_save(flags);
this_tsc_khz = __get_cpu_var(cpu_tsc_khz);
if (unlikely(this_tsc_khz == 0)) {
local_irq_restore(flags);
kvm_make_request(KVM_REQ_CLOCK_UPDATE, v);
return 1;
}
if (!use_master_clock) {
host_tsc = native_read_tsc();
kernel_ns = get_kernel_ns();
}
tsc_timestamp = kvm_x86_ops->read_l1_tsc(v, host_tsc);
/*
* We may have to catch up the TSC to match elapsed wall clock
* time for two reasons, even if kvmclock is used.
* 1) CPU could have been running below the maximum TSC rate
* 2) Broken TSC compensation resets the base at each VCPU
* entry to avoid unknown leaps of TSC even when running
* again on the same CPU. This may cause apparent elapsed
* time to disappear, and the guest to stand still or run
* very slowly.
*/
if (vcpu->tsc_catchup) {
u64 tsc = compute_guest_tsc(v, kernel_ns);
if (tsc > tsc_timestamp) {
adjust_tsc_offset_guest(v, tsc - tsc_timestamp);
tsc_timestamp = tsc;
}
}
local_irq_restore(flags);
if (!vcpu->pv_time_enabled)
return 0;
/*
* Time as measured by the TSC may go backwards when resetting the base
* tsc_timestamp. The reason for this is that the TSC resolution is
* higher than the resolution of the other clock scales. Thus, many
* possible measurments of the TSC correspond to one measurement of any
* other clock, and so a spread of values is possible. This is not a
* problem for the computation of the nanosecond clock; with TSC rates
* around 1GHZ, there can only be a few cycles which correspond to one
* nanosecond value, and any path through this code will inevitably
* take longer than that. However, with the kernel_ns value itself,
* the precision may be much lower, down to HZ granularity. If the
* first sampling of TSC against kernel_ns ends in the low part of the
* range, and the second in the high end of the range, we can get:
*
* (TSC - offset_low) * S + kns_old > (TSC - offset_high) * S + kns_new
*
* As the sampling errors potentially range in the thousands of cycles,
* it is possible such a time value has already been observed by the
* guest. To protect against this, we must compute the system time as
* observed by the guest and ensure the new system time is greater.
*/
max_kernel_ns = 0;
if (vcpu->hv_clock.tsc_timestamp) {
max_kernel_ns = vcpu->last_guest_tsc -
vcpu->hv_clock.tsc_timestamp;
max_kernel_ns = pvclock_scale_delta(max_kernel_ns,
vcpu->hv_clock.tsc_to_system_mul,
vcpu->hv_clock.tsc_shift);
max_kernel_ns += vcpu->last_kernel_ns;
}
if (unlikely(vcpu->hw_tsc_khz != this_tsc_khz)) {
kvm_get_time_scale(NSEC_PER_SEC / 1000, this_tsc_khz,
&vcpu->hv_clock.tsc_shift,
&vcpu->hv_clock.tsc_to_system_mul);
vcpu->hw_tsc_khz = this_tsc_khz;
}
/* with a master <monotonic time, tsc value> tuple,
* pvclock clock reads always increase at the (scaled) rate
* of guest TSC - no need to deal with sampling errors.
*/
if (!use_master_clock) {
if (max_kernel_ns > kernel_ns)
kernel_ns = max_kernel_ns;
}
/* With all the info we got, fill in the values */
vcpu->hv_clock.tsc_timestamp = tsc_timestamp;
vcpu->hv_clock.system_time = kernel_ns + v->kvm->arch.kvmclock_offset;
vcpu->last_kernel_ns = kernel_ns;
vcpu->last_guest_tsc = tsc_timestamp;
/*
* The interface expects us to write an even number signaling that the
* update is finished. Since the guest won't see the intermediate
* state, we just increase by 2 at the end.
*/
vcpu->hv_clock.version += 2;
if (unlikely(kvm_read_guest_cached(v->kvm, &vcpu->pv_time,
&guest_hv_clock, sizeof(guest_hv_clock))))
return 0;
/* retain PVCLOCK_GUEST_STOPPED if set in guest copy */
pvclock_flags = (guest_hv_clock.flags & PVCLOCK_GUEST_STOPPED);
if (vcpu->pvclock_set_guest_stopped_request) {
pvclock_flags |= PVCLOCK_GUEST_STOPPED;
vcpu->pvclock_set_guest_stopped_request = false;
}
/* If the host uses TSC clocksource, then it is stable */
if (use_master_clock)
pvclock_flags |= PVCLOCK_TSC_STABLE_BIT;
vcpu->hv_clock.flags = pvclock_flags;
kvm_write_guest_cached(v->kvm, &vcpu->pv_time,
&vcpu->hv_clock,
sizeof(vcpu->hv_clock));
return 0;
}
/*
* kvmclock updates which are isolated to a given vcpu, such as
* vcpu->cpu migration, should not allow system_timestamp from
* the rest of the vcpus to remain static. Otherwise ntp frequency
* correction applies to one vcpu's system_timestamp but not
* the others.
*
* So in those cases, request a kvmclock update for all vcpus.
* The worst case for a remote vcpu to update its kvmclock
* is then bounded by maximum nohz sleep latency.
*/
static void kvm_gen_kvmclock_update(struct kvm_vcpu *v)
{
int i;
struct kvm *kvm = v->kvm;
struct kvm_vcpu *vcpu;
kvm_for_each_vcpu(i, vcpu, kvm) {
set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
kvm_vcpu_kick(vcpu);
}
}
static bool msr_mtrr_valid(unsigned msr)
{
switch (msr) {
case 0x200 ... 0x200 + 2 * KVM_NR_VAR_MTRR - 1:
case MSR_MTRRfix64K_00000:
case MSR_MTRRfix16K_80000:
case MSR_MTRRfix16K_A0000:
case MSR_MTRRfix4K_C0000:
case MSR_MTRRfix4K_C8000:
case MSR_MTRRfix4K_D0000:
case MSR_MTRRfix4K_D8000:
case MSR_MTRRfix4K_E0000:
case MSR_MTRRfix4K_E8000:
case MSR_MTRRfix4K_F0000:
case MSR_MTRRfix4K_F8000:
case MSR_MTRRdefType:
case MSR_IA32_CR_PAT:
return true;
case 0x2f8:
return true;
}
return false;
}
static bool valid_pat_type(unsigned t)
{
return t < 8 && (1 << t) & 0xf3; /* 0, 1, 4, 5, 6, 7 */
}
static bool valid_mtrr_type(unsigned t)
{
return t < 8 && (1 << t) & 0x73; /* 0, 1, 4, 5, 6 */
}
static bool mtrr_valid(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
int i;
if (!msr_mtrr_valid(msr))
return false;
if (msr == MSR_IA32_CR_PAT) {
for (i = 0; i < 8; i++)
if (!valid_pat_type((data >> (i * 8)) & 0xff))
return false;
return true;
} else if (msr == MSR_MTRRdefType) {
if (data & ~0xcff)
return false;
return valid_mtrr_type(data & 0xff);
} else if (msr >= MSR_MTRRfix64K_00000 && msr <= MSR_MTRRfix4K_F8000) {
for (i = 0; i < 8 ; i++)
if (!valid_mtrr_type((data >> (i * 8)) & 0xff))
return false;
return true;
}
/* variable MTRRs */
return valid_mtrr_type(data & 0xff);
}
static int set_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
if (!mtrr_valid(vcpu, msr, data))
return 1;
if (msr == MSR_MTRRdefType) {
vcpu->arch.mtrr_state.def_type = data;
vcpu->arch.mtrr_state.enabled = (data & 0xc00) >> 10;
} else if (msr == MSR_MTRRfix64K_00000)
p[0] = data;
else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
p[1 + msr - MSR_MTRRfix16K_80000] = data;
else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
p[3 + msr - MSR_MTRRfix4K_C0000] = data;
else if (msr == MSR_IA32_CR_PAT)
vcpu->arch.pat = data;
else { /* Variable MTRRs */
int idx, is_mtrr_mask;
u64 *pt;
idx = (msr - 0x200) / 2;
is_mtrr_mask = msr - 0x200 - 2 * idx;
if (!is_mtrr_mask)
pt =
(u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
else
pt =
(u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
*pt = data;
}
kvm_mmu_reset_context(vcpu);
return 0;
}
static int set_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
u64 mcg_cap = vcpu->arch.mcg_cap;
unsigned bank_num = mcg_cap & 0xff;
switch (msr) {
case MSR_IA32_MCG_STATUS:
vcpu->arch.mcg_status = data;
break;
case MSR_IA32_MCG_CTL:
if (!(mcg_cap & MCG_CTL_P))
return 1;
if (data != 0 && data != ~(u64)0)
return -1;
vcpu->arch.mcg_ctl = data;
break;
default:
if (msr >= MSR_IA32_MC0_CTL &&
msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
u32 offset = msr - MSR_IA32_MC0_CTL;
/* only 0 or all 1s can be written to IA32_MCi_CTL
* some Linux kernels though clear bit 10 in bank 4 to
* workaround a BIOS/GART TBL issue on AMD K8s, ignore
* this to avoid an uncatched #GP in the guest
*/
if ((offset & 0x3) == 0 &&
data != 0 && (data | (1 << 10)) != ~(u64)0)
return -1;
vcpu->arch.mce_banks[offset] = data;
break;
}
return 1;
}
return 0;
}
static int xen_hvm_config(struct kvm_vcpu *vcpu, u64 data)
{
struct kvm *kvm = vcpu->kvm;
int lm = is_long_mode(vcpu);
u8 *blob_addr = lm ? (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_64
: (u8 *)(long)kvm->arch.xen_hvm_config.blob_addr_32;
u8 blob_size = lm ? kvm->arch.xen_hvm_config.blob_size_64
: kvm->arch.xen_hvm_config.blob_size_32;
u32 page_num = data & ~PAGE_MASK;
u64 page_addr = data & PAGE_MASK;
u8 *page;
int r;
r = -E2BIG;
if (page_num >= blob_size)
goto out;
r = -ENOMEM;
page = memdup_user(blob_addr + (page_num * PAGE_SIZE), PAGE_SIZE);
if (IS_ERR(page)) {
r = PTR_ERR(page);
goto out;
}
if (kvm_write_guest(kvm, page_addr, page, PAGE_SIZE))
goto out_free;
r = 0;
out_free:
kfree(page);
out:
return r;
}
static bool kvm_hv_hypercall_enabled(struct kvm *kvm)
{
return kvm->arch.hv_hypercall & HV_X64_MSR_HYPERCALL_ENABLE;
}
static bool kvm_hv_msr_partition_wide(u32 msr)
{
bool r = false;
switch (msr) {
case HV_X64_MSR_GUEST_OS_ID:
case HV_X64_MSR_HYPERCALL:
r = true;
break;
}
return r;
}
static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
struct kvm *kvm = vcpu->kvm;
switch (msr) {
case HV_X64_MSR_GUEST_OS_ID:
kvm->arch.hv_guest_os_id = data;
/* setting guest os id to zero disables hypercall page */
if (!kvm->arch.hv_guest_os_id)
kvm->arch.hv_hypercall &= ~HV_X64_MSR_HYPERCALL_ENABLE;
break;
case HV_X64_MSR_HYPERCALL: {
u64 gfn;
unsigned long addr;
u8 instructions[4];
/* if guest os id is not set hypercall should remain disabled */
if (!kvm->arch.hv_guest_os_id)
break;
if (!(data & HV_X64_MSR_HYPERCALL_ENABLE)) {
kvm->arch.hv_hypercall = data;
break;
}
gfn = data >> HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT;
addr = gfn_to_hva(kvm, gfn);
if (kvm_is_error_hva(addr))
return 1;
kvm_x86_ops->patch_hypercall(vcpu, instructions);
((unsigned char *)instructions)[3] = 0xc3; /* ret */
if (__copy_to_user((void __user *)addr, instructions, 4))
return 1;
kvm->arch.hv_hypercall = data;
break;
}
default:
vcpu_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
"data 0x%llx\n", msr, data);
return 1;
}
return 0;
}
static int set_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
switch (msr) {
case HV_X64_MSR_APIC_ASSIST_PAGE: {
unsigned long addr;
if (!(data & HV_X64_MSR_APIC_ASSIST_PAGE_ENABLE)) {
vcpu->arch.hv_vapic = data;
break;
}
addr = gfn_to_hva(vcpu->kvm, data >>
HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT);
if (kvm_is_error_hva(addr))
return 1;
if (__clear_user((void __user *)addr, PAGE_SIZE))
return 1;
vcpu->arch.hv_vapic = data;
break;
}
case HV_X64_MSR_EOI:
return kvm_hv_vapic_msr_write(vcpu, APIC_EOI, data);
case HV_X64_MSR_ICR:
return kvm_hv_vapic_msr_write(vcpu, APIC_ICR, data);
case HV_X64_MSR_TPR:
return kvm_hv_vapic_msr_write(vcpu, APIC_TASKPRI, data);
default:
vcpu_unimpl(vcpu, "HYPER-V unimplemented wrmsr: 0x%x "
"data 0x%llx\n", msr, data);
return 1;
}
return 0;
}
static int kvm_pv_enable_async_pf(struct kvm_vcpu *vcpu, u64 data)
{
gpa_t gpa = data & ~0x3f;
/* Bits 2:5 are reserved, Should be zero */
if (data & 0x3c)
return 1;
vcpu->arch.apf.msr_val = data;
if (!(data & KVM_ASYNC_PF_ENABLED)) {
kvm_clear_async_pf_completion_queue(vcpu);
kvm_async_pf_hash_reset(vcpu);
return 0;
}
if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.apf.data, gpa,
sizeof(u32)))
return 1;
vcpu->arch.apf.send_user_only = !(data & KVM_ASYNC_PF_SEND_ALWAYS);
kvm_async_pf_wakeup_all(vcpu);
return 0;
}
static void kvmclock_reset(struct kvm_vcpu *vcpu)
{
vcpu->arch.pv_time_enabled = false;
}
static void accumulate_steal_time(struct kvm_vcpu *vcpu)
{
u64 delta;
if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
return;
delta = current->sched_info.run_delay - vcpu->arch.st.last_steal;
vcpu->arch.st.last_steal = current->sched_info.run_delay;
vcpu->arch.st.accum_steal = delta;
}
static void record_steal_time(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.st.msr_val & KVM_MSR_ENABLED))
return;
if (unlikely(kvm_read_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
&vcpu->arch.st.steal, sizeof(struct kvm_steal_time))))
return;
vcpu->arch.st.steal.steal += vcpu->arch.st.accum_steal;
vcpu->arch.st.steal.version += 2;
vcpu->arch.st.accum_steal = 0;
kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.st.stime,
&vcpu->arch.st.steal, sizeof(struct kvm_steal_time));
}
int kvm_set_msr_common(struct kvm_vcpu *vcpu, struct msr_data *msr_info)
{
bool pr = false;
u32 msr = msr_info->index;
u64 data = msr_info->data;
switch (msr) {
case MSR_AMD64_NB_CFG:
case MSR_IA32_UCODE_REV:
case MSR_IA32_UCODE_WRITE:
case MSR_VM_HSAVE_PA:
case MSR_AMD64_PATCH_LOADER:
case MSR_AMD64_BU_CFG2:
break;
case MSR_EFER:
return set_efer(vcpu, data);
case MSR_K7_HWCR:
data &= ~(u64)0x40; /* ignore flush filter disable */
data &= ~(u64)0x100; /* ignore ignne emulation enable */
data &= ~(u64)0x8; /* ignore TLB cache disable */
if (data != 0) {
vcpu_unimpl(vcpu, "unimplemented HWCR wrmsr: 0x%llx\n",
data);
return 1;
}
break;
case MSR_FAM10H_MMIO_CONF_BASE:
if (data != 0) {
vcpu_unimpl(vcpu, "unimplemented MMIO_CONF_BASE wrmsr: "
"0x%llx\n", data);
return 1;
}
break;
case MSR_IA32_DEBUGCTLMSR:
if (!data) {
/* We support the non-activated case already */
break;
} else if (data & ~(DEBUGCTLMSR_LBR | DEBUGCTLMSR_BTF)) {
/* Values other than LBR and BTF are vendor-specific,
thus reserved and should throw a #GP */
return 1;
}
vcpu_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
__func__, data);
break;
case 0x200 ... 0x2ff:
return set_msr_mtrr(vcpu, msr, data);
case MSR_IA32_APICBASE:
kvm_set_apic_base(vcpu, data);
break;
case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
return kvm_x2apic_msr_write(vcpu, msr, data);
case MSR_IA32_TSCDEADLINE:
kvm_set_lapic_tscdeadline_msr(vcpu, data);
break;
case MSR_IA32_TSC_ADJUST:
if (guest_cpuid_has_tsc_adjust(vcpu)) {
if (!msr_info->host_initiated) {
u64 adj = data - vcpu->arch.ia32_tsc_adjust_msr;
kvm_x86_ops->adjust_tsc_offset(vcpu, adj, true);
}
vcpu->arch.ia32_tsc_adjust_msr = data;
}
break;
case MSR_IA32_MISC_ENABLE:
vcpu->arch.ia32_misc_enable_msr = data;
break;
case MSR_KVM_WALL_CLOCK_NEW:
case MSR_KVM_WALL_CLOCK:
vcpu->kvm->arch.wall_clock = data;
kvm_write_wall_clock(vcpu->kvm, data);
break;
case MSR_KVM_SYSTEM_TIME_NEW:
case MSR_KVM_SYSTEM_TIME: {
u64 gpa_offset;
kvmclock_reset(vcpu);
vcpu->arch.time = data;
kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
/* we verify if the enable bit is set... */
if (!(data & 1))
break;
gpa_offset = data & ~(PAGE_MASK | 1);
if (kvm_gfn_to_hva_cache_init(vcpu->kvm,
&vcpu->arch.pv_time, data & ~1ULL,
sizeof(struct pvclock_vcpu_time_info)))
vcpu->arch.pv_time_enabled = false;
else
vcpu->arch.pv_time_enabled = true;
break;
}
case MSR_KVM_ASYNC_PF_EN:
if (kvm_pv_enable_async_pf(vcpu, data))
return 1;
break;
case MSR_KVM_STEAL_TIME:
if (unlikely(!sched_info_on()))
return 1;
if (data & KVM_STEAL_RESERVED_MASK)
return 1;
if (kvm_gfn_to_hva_cache_init(vcpu->kvm, &vcpu->arch.st.stime,
data & KVM_STEAL_VALID_BITS,
sizeof(struct kvm_steal_time)))
return 1;
vcpu->arch.st.msr_val = data;
if (!(data & KVM_MSR_ENABLED))
break;
vcpu->arch.st.last_steal = current->sched_info.run_delay;
preempt_disable();
accumulate_steal_time(vcpu);
preempt_enable();
kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
break;
case MSR_KVM_PV_EOI_EN:
if (kvm_lapic_enable_pv_eoi(vcpu, data))
return 1;
break;
case MSR_IA32_MCG_CTL:
case MSR_IA32_MCG_STATUS:
case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
return set_msr_mce(vcpu, msr, data);
/* Performance counters are not protected by a CPUID bit,
* so we should check all of them in the generic path for the sake of
* cross vendor migration.
* Writing a zero into the event select MSRs disables them,
* which we perfectly emulate ;-). Any other value should be at least
* reported, some guests depend on them.
*/
case MSR_K7_EVNTSEL0:
case MSR_K7_EVNTSEL1:
case MSR_K7_EVNTSEL2:
case MSR_K7_EVNTSEL3:
if (data != 0)
vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
"0x%x data 0x%llx\n", msr, data);
break;
/* at least RHEL 4 unconditionally writes to the perfctr registers,
* so we ignore writes to make it happy.
*/
case MSR_K7_PERFCTR0:
case MSR_K7_PERFCTR1:
case MSR_K7_PERFCTR2:
case MSR_K7_PERFCTR3:
vcpu_unimpl(vcpu, "unimplemented perfctr wrmsr: "
"0x%x data 0x%llx\n", msr, data);
break;
case MSR_P6_PERFCTR0:
case MSR_P6_PERFCTR1:
pr = true;
case MSR_P6_EVNTSEL0:
case MSR_P6_EVNTSEL1:
if (kvm_pmu_msr(vcpu, msr))
return kvm_pmu_set_msr(vcpu, msr_info);
if (pr || data != 0)
vcpu_unimpl(vcpu, "disabled perfctr wrmsr: "
"0x%x data 0x%llx\n", msr, data);
break;
case MSR_K7_CLK_CTL:
/*
* Ignore all writes to this no longer documented MSR.
* Writes are only relevant for old K7 processors,
* all pre-dating SVM, but a recommended workaround from
* AMD for these chips. It is possible to specify the
* affected processor models on the command line, hence
* the need to ignore the workaround.
*/
break;
case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
if (kvm_hv_msr_partition_wide(msr)) {
int r;
mutex_lock(&vcpu->kvm->lock);
r = set_msr_hyperv_pw(vcpu, msr, data);
mutex_unlock(&vcpu->kvm->lock);
return r;
} else
return set_msr_hyperv(vcpu, msr, data);
break;
case MSR_IA32_BBL_CR_CTL3:
/* Drop writes to this legacy MSR -- see rdmsr
* counterpart for further detail.
*/
vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n", msr, data);
break;
case MSR_AMD64_OSVW_ID_LENGTH:
if (!guest_cpuid_has_osvw(vcpu))
return 1;
vcpu->arch.osvw.length = data;
break;
case MSR_AMD64_OSVW_STATUS:
if (!guest_cpuid_has_osvw(vcpu))
return 1;
vcpu->arch.osvw.status = data;
break;
default:
if (msr && (msr == vcpu->kvm->arch.xen_hvm_config.msr))
return xen_hvm_config(vcpu, data);
if (kvm_pmu_msr(vcpu, msr))
return kvm_pmu_set_msr(vcpu, msr_info);
if (!ignore_msrs) {
vcpu_unimpl(vcpu, "unhandled wrmsr: 0x%x data %llx\n",
msr, data);
return 1;
} else {
vcpu_unimpl(vcpu, "ignored wrmsr: 0x%x data %llx\n",
msr, data);
break;
}
}
return 0;
}
EXPORT_SYMBOL_GPL(kvm_set_msr_common);
/*
* Reads an msr value (of 'msr_index') into 'pdata'.
* Returns 0 on success, non-0 otherwise.
* Assumes vcpu_load() was already called.
*/
int kvm_get_msr(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata)
{
return kvm_x86_ops->get_msr(vcpu, msr_index, pdata);
}
static int get_msr_mtrr(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
u64 *p = (u64 *)&vcpu->arch.mtrr_state.fixed_ranges;
if (!msr_mtrr_valid(msr))
return 1;
if (msr == MSR_MTRRdefType)
*pdata = vcpu->arch.mtrr_state.def_type +
(vcpu->arch.mtrr_state.enabled << 10);
else if (msr == MSR_MTRRfix64K_00000)
*pdata = p[0];
else if (msr == MSR_MTRRfix16K_80000 || msr == MSR_MTRRfix16K_A0000)
*pdata = p[1 + msr - MSR_MTRRfix16K_80000];
else if (msr >= MSR_MTRRfix4K_C0000 && msr <= MSR_MTRRfix4K_F8000)
*pdata = p[3 + msr - MSR_MTRRfix4K_C0000];
else if (msr == MSR_IA32_CR_PAT)
*pdata = vcpu->arch.pat;
else { /* Variable MTRRs */
int idx, is_mtrr_mask;
u64 *pt;
idx = (msr - 0x200) / 2;
is_mtrr_mask = msr - 0x200 - 2 * idx;
if (!is_mtrr_mask)
pt =
(u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].base_lo;
else
pt =
(u64 *)&vcpu->arch.mtrr_state.var_ranges[idx].mask_lo;
*pdata = *pt;
}
return 0;
}
static int get_msr_mce(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
u64 data;
u64 mcg_cap = vcpu->arch.mcg_cap;
unsigned bank_num = mcg_cap & 0xff;
switch (msr) {
case MSR_IA32_P5_MC_ADDR:
case MSR_IA32_P5_MC_TYPE:
data = 0;
break;
case MSR_IA32_MCG_CAP:
data = vcpu->arch.mcg_cap;
break;
case MSR_IA32_MCG_CTL:
if (!(mcg_cap & MCG_CTL_P))
return 1;
data = vcpu->arch.mcg_ctl;
break;
case MSR_IA32_MCG_STATUS:
data = vcpu->arch.mcg_status;
break;
default:
if (msr >= MSR_IA32_MC0_CTL &&
msr < MSR_IA32_MC0_CTL + 4 * bank_num) {
u32 offset = msr - MSR_IA32_MC0_CTL;
data = vcpu->arch.mce_banks[offset];
break;
}
return 1;
}
*pdata = data;
return 0;
}
static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
u64 data = 0;
struct kvm *kvm = vcpu->kvm;
switch (msr) {
case HV_X64_MSR_GUEST_OS_ID:
data = kvm->arch.hv_guest_os_id;
break;
case HV_X64_MSR_HYPERCALL:
data = kvm->arch.hv_hypercall;
break;
default:
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;
}
*pdata = data;
return 0;
}
static int get_msr_hyperv(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
u64 data = 0;
switch (msr) {
case HV_X64_MSR_VP_INDEX: {
int r;
struct kvm_vcpu *v;
kvm_for_each_vcpu(r, v, vcpu->kvm)
if (v == vcpu)
data = r;
break;
}
case HV_X64_MSR_EOI:
return kvm_hv_vapic_msr_read(vcpu, APIC_EOI, pdata);
case HV_X64_MSR_ICR:
return kvm_hv_vapic_msr_read(vcpu, APIC_ICR, pdata);
case HV_X64_MSR_TPR:
return kvm_hv_vapic_msr_read(vcpu, APIC_TASKPRI, pdata);
case HV_X64_MSR_APIC_ASSIST_PAGE:
data = vcpu->arch.hv_vapic;
break;
default:
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;
}
*pdata = data;
return 0;
}
int kvm_get_msr_common(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
{
u64 data;
switch (msr) {
case MSR_IA32_PLATFORM_ID:
case MSR_IA32_EBL_CR_POWERON:
case MSR_IA32_DEBUGCTLMSR:
case MSR_IA32_LASTBRANCHFROMIP:
case MSR_IA32_LASTBRANCHTOIP:
case MSR_IA32_LASTINTFROMIP:
case MSR_IA32_LASTINTTOIP:
case MSR_K8_SYSCFG:
case MSR_K7_HWCR:
case MSR_VM_HSAVE_PA:
case MSR_K7_EVNTSEL0:
case MSR_K7_PERFCTR0:
case MSR_K8_INT_PENDING_MSG:
case MSR_AMD64_NB_CFG:
case MSR_FAM10H_MMIO_CONF_BASE:
case MSR_AMD64_BU_CFG2:
data = 0;
break;
case MSR_P6_PERFCTR0:
case MSR_P6_PERFCTR1:
case MSR_P6_EVNTSEL0:
case MSR_P6_EVNTSEL1:
if (kvm_pmu_msr(vcpu, msr))
return kvm_pmu_get_msr(vcpu, msr, pdata);
data = 0;
break;
case MSR_IA32_UCODE_REV:
data = 0x100000000ULL;
break;
case MSR_MTRRcap:
data = 0x500 | KVM_NR_VAR_MTRR;
break;
case 0x200 ... 0x2ff:
return get_msr_mtrr(vcpu, msr, pdata);
case 0xcd: /* fsb frequency */
data = 3;
break;
/*
* MSR_EBC_FREQUENCY_ID
* Conservative value valid for even the basic CPU models.
* Models 0,1: 000 in bits 23:21 indicating a bus speed of
* 100MHz, model 2 000 in bits 18:16 indicating 100MHz,
* and 266MHz for model 3, or 4. Set Core Clock
* Frequency to System Bus Frequency Ratio to 1 (bits
* 31:24) even though these are only valid for CPU
* models > 2, however guests may end up dividing or
* multiplying by zero otherwise.
*/
case MSR_EBC_FREQUENCY_ID:
data = 1 << 24;
break;
case MSR_IA32_APICBASE:
data = kvm_get_apic_base(vcpu);
break;
case APIC_BASE_MSR ... APIC_BASE_MSR + 0x3ff:
return kvm_x2apic_msr_read(vcpu, msr, pdata);
break;
case MSR_IA32_TSCDEADLINE:
data = kvm_get_lapic_tscdeadline_msr(vcpu);
break;
case MSR_IA32_TSC_ADJUST:
data = (u64)vcpu->arch.ia32_tsc_adjust_msr;
break;
case MSR_IA32_MISC_ENABLE:
data = vcpu->arch.ia32_misc_enable_msr;
break;
case MSR_IA32_PERF_STATUS:
/* TSC increment by tick */
data = 1000ULL;
/* CPU multiplier */
data |= (((uint64_t)4ULL) << 40);
break;
case MSR_EFER:
data = vcpu->arch.efer;
break;
case MSR_KVM_WALL_CLOCK:
case MSR_KVM_WALL_CLOCK_NEW:
data = vcpu->kvm->arch.wall_clock;
break;
case MSR_KVM_SYSTEM_TIME:
case MSR_KVM_SYSTEM_TIME_NEW:
data = vcpu->arch.time;
break;
case MSR_KVM_ASYNC_PF_EN:
data = vcpu->arch.apf.msr_val;
break;
case MSR_KVM_STEAL_TIME:
data = vcpu->arch.st.msr_val;
break;
case MSR_KVM_PV_EOI_EN:
data = vcpu->arch.pv_eoi.msr_val;
break;
case MSR_IA32_P5_MC_ADDR:
case MSR_IA32_P5_MC_TYPE:
case MSR_IA32_MCG_CAP:
case MSR_IA32_MCG_CTL:
case MSR_IA32_MCG_STATUS:
case MSR_IA32_MC0_CTL ... MSR_IA32_MC0_CTL + 4 * KVM_MAX_MCE_BANKS - 1:
return get_msr_mce(vcpu, msr, pdata);
case MSR_K7_CLK_CTL:
/*
* Provide expected ramp-up count for K7. All other
* are set to zero, indicating minimum divisors for
* every field.
*
* This prevents guest kernels on AMD host with CPU
* type 6, model 8 and higher from exploding due to
* the rdmsr failing.
*/
data = 0x20000000;
break;
case HV_X64_MSR_GUEST_OS_ID ... HV_X64_MSR_SINT15:
if (kvm_hv_msr_partition_wide(msr)) {
int r;
mutex_lock(&vcpu->kvm->lock);
r = get_msr_hyperv_pw(vcpu, msr, pdata);
mutex_unlock(&vcpu->kvm->lock);
return r;
} else
return get_msr_hyperv(vcpu, msr, pdata);
break;
case MSR_IA32_BBL_CR_CTL3:
/* This legacy MSR exists but isn't fully documented in current
* silicon. It is however accessed by winxp in very narrow
* scenarios where it sets bit #19, itself documented as
* a "reserved" bit. Best effort attempt to source coherent
* read data here should the balance of the register be
* interpreted by the guest:
*
* L2 cache control register 3: 64GB range, 256KB size,
* enabled, latency 0x1, configured
*/
data = 0xbe702111;
break;
case MSR_AMD64_OSVW_ID_LENGTH:
if (!guest_cpuid_has_osvw(vcpu))
return 1;
data = vcpu->arch.osvw.length;
break;
case MSR_AMD64_OSVW_STATUS:
if (!guest_cpuid_has_osvw(vcpu))
return 1;
data = vcpu->arch.osvw.status;
break;
default:
if (kvm_pmu_msr(vcpu, msr))
return kvm_pmu_get_msr(vcpu, msr, pdata);
if (!ignore_msrs) {
vcpu_unimpl(vcpu, "unhandled rdmsr: 0x%x\n", msr);
return 1;
} else {
vcpu_unimpl(vcpu, "ignored rdmsr: 0x%x\n", msr);
data = 0;
}
break;
}
*pdata = data;
return 0;
}
EXPORT_SYMBOL_GPL(kvm_get_msr_common);
/*
* Read or write a bunch of msrs. All parameters are kernel addresses.
*
* @return number of msrs set successfully.
*/
static int __msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs *msrs,
struct kvm_msr_entry *entries,
int (*do_msr)(struct kvm_vcpu *vcpu,
unsigned index, u64 *data))
{
int i, idx;
idx = srcu_read_lock(&vcpu->kvm->srcu);
for (i = 0; i < msrs->nmsrs; ++i)
if (do_msr(vcpu, entries[i].index, &entries[i].data))
break;
srcu_read_unlock(&vcpu->kvm->srcu, idx);
return i;
}
/*
* Read or write a bunch of msrs. Parameters are user addresses.
*
* @return number of msrs set successfully.
*/
static int msr_io(struct kvm_vcpu *vcpu, struct kvm_msrs __user *user_msrs,
int (*do_msr)(struct kvm_vcpu *vcpu,
unsigned index, u64 *data),
int writeback)
{
struct kvm_msrs msrs;
struct kvm_msr_entry *entries;
int r, n;
unsigned size;
r = -EFAULT;
if (copy_from_user(&msrs, user_msrs, sizeof msrs))
goto out;
r = -E2BIG;
if (msrs.nmsrs >= MAX_IO_MSRS)
goto out;
size = sizeof(struct kvm_msr_entry) * msrs.nmsrs;
entries = memdup_user(user_msrs->entries, size);
if (IS_ERR(entries)) {
r = PTR_ERR(entries);
goto out;
}
r = n = __msr_io(vcpu, &msrs, entries, do_msr);
if (r < 0)
goto out_free;
r = -EFAULT;
if (writeback && copy_to_user(user_msrs->entries, entries, size))
goto out_free;
r = n;
out_free:
kfree(entries);
out:
return r;
}
int kvm_dev_ioctl_check_extension(long ext)
{
int r;
switch (ext) {
case KVM_CAP_IRQCHIP:
case KVM_CAP_HLT:
case KVM_CAP_MMU_SHADOW_CACHE_CONTROL:
case KVM_CAP_SET_TSS_ADDR:
case KVM_CAP_EXT_CPUID:
case KVM_CAP_CLOCKSOURCE:
case KVM_CAP_PIT:
case KVM_CAP_NOP_IO_DELAY:
case KVM_CAP_MP_STATE:
case KVM_CAP_SYNC_MMU:
case KVM_CAP_USER_NMI:
case KVM_CAP_REINJECT_CONTROL:
case KVM_CAP_IRQ_INJECT_STATUS:
case KVM_CAP_IRQFD:
case KVM_CAP_IOEVENTFD:
case KVM_CAP_PIT2:
case KVM_CAP_PIT_STATE2:
case KVM_CAP_SET_IDENTITY_MAP_ADDR:
case KVM_CAP_XEN_HVM:
case KVM_CAP_ADJUST_CLOCK:
case KVM_CAP_VCPU_EVENTS:
case KVM_CAP_HYPERV:
case KVM_CAP_HYPERV_VAPIC:
case KVM_CAP_HYPERV_SPIN:
case KVM_CAP_PCI_SEGMENT:
case KVM_CAP_DEBUGREGS:
case KVM_CAP_X86_ROBUST_SINGLESTEP:
case KVM_CAP_XSAVE:
case KVM_CAP_ASYNC_PF:
case KVM_CAP_GET_TSC_KHZ:
case KVM_CAP_KVMCLOCK_CTRL:
case KVM_CAP_READONLY_MEM:
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
case KVM_CAP_ASSIGN_DEV_IRQ:
case KVM_CAP_PCI_2_3:
#endif
r = 1;
break;
case KVM_CAP_COALESCED_MMIO:
r = KVM_COALESCED_MMIO_PAGE_OFFSET;
break;
case KVM_CAP_VAPIC:
r = !kvm_x86_ops->cpu_has_accelerated_tpr();
break;
case KVM_CAP_NR_VCPUS:
r = KVM_SOFT_MAX_VCPUS;
break;
case KVM_CAP_MAX_VCPUS:
r = KVM_MAX_VCPUS;
break;
case KVM_CAP_NR_MEMSLOTS:
r = KVM_USER_MEM_SLOTS;
break;
case KVM_CAP_PV_MMU: /* obsolete */
r = 0;
break;
#ifdef CONFIG_KVM_DEVICE_ASSIGNMENT
case KVM_CAP_IOMMU:
r = iommu_present(&pci_bus_type);
break;
#endif
case KVM_CAP_MCE:
r = KVM_MAX_MCE_BANKS;
break;
case KVM_CAP_XCRS:
r = cpu_has_xsave;
break;
case KVM_CAP_TSC_CONTROL:
r = kvm_has_tsc_control;
break;
case KVM_CAP_TSC_DEADLINE_TIMER:
r = boot_cpu_has(X86_FEATURE_TSC_DEADLINE_TIMER);
break;
default:
r = 0;
break;
}
return r;
}
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
void __user *argp = (void __user *)arg;
long r;
switch (ioctl) {
case KVM_GET_MSR_INDEX_LIST: {
struct kvm_msr_list __user *user_msr_list = argp;
struct kvm_msr_list msr_list;
unsigned n;
r = -EFAULT;
if (copy_from_user(&msr_list, user_msr_list, sizeof msr_list))
goto out;
n = msr_list.nmsrs;
msr_list.nmsrs = num_msrs_to_save + ARRAY_SIZE(emulated_msrs);
if (copy_to_user(user_msr_list, &msr_list, sizeof msr_list))
goto out;
r = -E2BIG;
if (n < msr_list.nmsrs)
goto out;
r = -EFAULT;
if (copy_to_user(user_msr_list->indices, &msrs_to_save,
num_msrs_to_save * sizeof(u32)))
goto out;
if (copy_to_user(user_msr_list->indices + num_msrs_to_save,
&emulated_msrs,
ARRAY_SIZE(emulated_msrs) * sizeof(u32)))
goto out;
r = 0;
break;
}
case KVM_GET_SUPPORTED_CPUID: {
struct kvm_cpuid2 __user *cpuid_arg = argp;
struct kvm_cpuid2 cpuid;
r = -EFAULT;
if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
goto out;
r = kvm_dev_ioctl_get_supported_cpuid(&cpuid,
cpuid_arg->entries);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
goto out;
r = 0;
break;
}
case KVM_X86_GET_MCE_CAP_SUPPORTED: {
u64 mce_cap;
mce_cap = KVM_MCE_CAP_SUPPORTED;
r = -EFAULT;
if (copy_to_user(argp, &mce_cap, sizeof mce_cap))
goto out;
r = 0;
break;
}
default:
r = -EINVAL;
}
out:
return r;
}
static void wbinvd_ipi(void *garbage)
{
wbinvd();
}
static bool need_emulate_wbinvd(struct kvm_vcpu *vcpu)
{
return vcpu->kvm->arch.iommu_domain &&
!(vcpu->kvm->arch.iommu_flags & KVM_IOMMU_CACHE_COHERENCY);
}
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
/* Address WBINVD may be executed by guest */
if (need_emulate_wbinvd(vcpu)) {
if (kvm_x86_ops->has_wbinvd_exit())
cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
else if (vcpu->cpu != -1 && vcpu->cpu != cpu)
smp_call_function_single(vcpu->cpu,
wbinvd_ipi, NULL, 1);
}
kvm_x86_ops->vcpu_load(vcpu, cpu);
/* Apply any externally detected TSC adjustments (due to suspend) */
if (unlikely(vcpu->arch.tsc_offset_adjustment)) {
adjust_tsc_offset_host(vcpu, vcpu->arch.tsc_offset_adjustment);
vcpu->arch.tsc_offset_adjustment = 0;
set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
}
if (unlikely(vcpu->cpu != cpu) || check_tsc_unstable()) {
s64 tsc_delta = !vcpu->arch.last_host_tsc ? 0 :
native_read_tsc() - vcpu->arch.last_host_tsc;
if (tsc_delta < 0)
mark_tsc_unstable("KVM discovered backwards TSC");
if (check_tsc_unstable()) {
u64 offset = kvm_x86_ops->compute_tsc_offset(vcpu,
vcpu->arch.last_guest_tsc);
kvm_x86_ops->write_tsc_offset(vcpu, offset);
vcpu->arch.tsc_catchup = 1;
}
/*
* On a host with synchronized TSC, there is no need to update
* kvmclock on vcpu->cpu migration
*/
if (!vcpu->kvm->arch.use_master_clock || vcpu->cpu == -1)
kvm_make_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu);
if (vcpu->cpu != cpu)
kvm_migrate_timers(vcpu);
vcpu->cpu = cpu;
}
accumulate_steal_time(vcpu);
kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
kvm_x86_ops->vcpu_put(vcpu);
kvm_put_guest_fpu(vcpu);
vcpu->arch.last_host_tsc = native_read_tsc();
}
static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
kvm_x86_ops->sync_pir_to_irr(vcpu);
memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
return 0;
}
static int kvm_vcpu_ioctl_set_lapic(struct kvm_vcpu *vcpu,
struct kvm_lapic_state *s)
{
kvm_apic_post_state_restore(vcpu, s);
update_cr8_intercept(vcpu);
return 0;
}
static int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu,
struct kvm_interrupt *irq)
{
if (irq->irq >= KVM_NR_INTERRUPTS)
return -EINVAL;
if (irqchip_in_kernel(vcpu->kvm))
return -ENXIO;
kvm_queue_interrupt(vcpu, irq->irq, false);
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
}
static int kvm_vcpu_ioctl_nmi(struct kvm_vcpu *vcpu)
{
kvm_inject_nmi(vcpu);
return 0;
}
static int vcpu_ioctl_tpr_access_reporting(struct kvm_vcpu *vcpu,
struct kvm_tpr_access_ctl *tac)
{
if (tac->flags)
return -EINVAL;
vcpu->arch.tpr_access_reporting = !!tac->enabled;
return 0;
}
static int kvm_vcpu_ioctl_x86_setup_mce(struct kvm_vcpu *vcpu,
u64 mcg_cap)
{
int r;
unsigned bank_num = mcg_cap & 0xff, bank;
r = -EINVAL;
if (!bank_num || bank_num >= KVM_MAX_MCE_BANKS)
goto out;
if (mcg_cap & ~(KVM_MCE_CAP_SUPPORTED | 0xff | 0xff0000))
goto out;
r = 0;
vcpu->arch.mcg_cap = mcg_cap;
/* Init IA32_MCG_CTL to all 1s */
if (mcg_cap & MCG_CTL_P)
vcpu->arch.mcg_ctl = ~(u64)0;
/* Init IA32_MCi_CTL to all 1s */
for (bank = 0; bank < bank_num; bank++)
vcpu->arch.mce_banks[bank*4] = ~(u64)0;
out:
return r;
}
static int kvm_vcpu_ioctl_x86_set_mce(struct kvm_vcpu *vcpu,
struct kvm_x86_mce *mce)
{
u64 mcg_cap = vcpu->arch.mcg_cap;
unsigned bank_num = mcg_cap & 0xff;
u64 *banks = vcpu->arch.mce_banks;
if (mce->bank >= bank_num || !(mce->status & MCI_STATUS_VAL))
return -EINVAL;
/*
* if IA32_MCG_CTL is not all 1s, the uncorrected error
* reporting is disabled
*/
if ((mce->status & MCI_STATUS_UC) && (mcg_cap & MCG_CTL_P) &&
vcpu->arch.mcg_ctl != ~(u64)0)
return 0;
banks += 4 * mce->bank;
/*
* if IA32_MCi_CTL is not all 1s, the uncorrected error
* reporting is disabled for the bank
*/
if ((mce->status & MCI_STATUS_UC) && banks[0] != ~(u64)0)
return 0;
if (mce->status & MCI_STATUS_UC) {
if ((vcpu->arch.mcg_status & MCG_STATUS_MCIP) ||
!kvm_read_cr4_bits(vcpu, X86_CR4_MCE)) {
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
return 0;
}
if (banks[1] & MCI_STATUS_VAL)
mce->status |= MCI_STATUS_OVER;
banks[2] = mce->addr;
banks[3] = mce->misc;
vcpu->arch.mcg_status = mce->mcg_status;
banks[1] = mce->status;
kvm_queue_exception(vcpu, MC_VECTOR);
} else if (!(banks[1] & MCI_STATUS_VAL)
|| !(banks[1] & MCI_STATUS_UC)) {
if (banks[1] & MCI_STATUS_VAL)
mce->status |= MCI_STATUS_OVER;
banks[2] = mce->addr;
banks[3] = mce->misc;
banks[1] = mce->status;
} else
banks[1] |= MCI_STATUS_OVER;
return 0;
}
static void kvm_vcpu_ioctl_x86_get_vcpu_events(struct kvm_vcpu *vcpu,
struct kvm_vcpu_events *events)
{
process_nmi(vcpu);
events->exception.injected =
vcpu->arch.exception.pending &&
!kvm_exception_is_soft(vcpu->arch.exception.nr);
events->exception.nr = vcpu->arch.exception.nr;
events->exception.has_error_code = vcpu->arch.exception.has_error_code;
events->exception.pad = 0;
events->exception.error_code = vcpu->arch.exception.error_code;
events->interrupt.injected =
vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft;
events->interrupt.nr = vcpu->arch.interrupt.nr;
events->interrupt.soft = 0;
events->interrupt.shadow =
kvm_x86_ops->get_interrupt_shadow(vcpu,
KVM_X86_SHADOW_INT_MOV_SS | KVM_X86_SHADOW_INT_STI);
events->nmi.injected = vcpu->arch.nmi_injected;
events->nmi.pending = vcpu->arch.nmi_pending != 0;
events->nmi.masked = kvm_x86_ops->get_nmi_mask(vcpu);
events->nmi.pad = 0;
events->sipi_vector = 0; /* never valid when reporting to user space */
events->flags = (KVM_VCPUEVENT_VALID_NMI_PENDING
| KVM_VCPUEVENT_VALID_SHADOW);
memset(&events->reserved, 0, sizeof(events->reserved));
}
static int kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
struct kvm_vcpu_events *events)
{
if (events->flags & ~(KVM_VCPUEVENT_VALID_NMI_PENDING
| KVM_VCPUEVENT_VALID_SIPI_VECTOR
| KVM_VCPUEVENT_VALID_SHADOW))
return -EINVAL;
process_nmi(vcpu);
vcpu->arch.exception.pending = events->exception.injected;
vcpu->arch.exception.nr = events->exception.nr;
vcpu->arch.exception.has_error_code = events->exception.has_error_code;
vcpu->arch.exception.error_code = events->exception.error_code;
vcpu->arch.interrupt.pending = events->interrupt.injected;
vcpu->arch.interrupt.nr = events->interrupt.nr;
vcpu->arch.interrupt.soft = events->interrupt.soft;
if (events->flags & KVM_VCPUEVENT_VALID_SHADOW)
kvm_x86_ops->set_interrupt_shadow(vcpu,
events->interrupt.shadow);
vcpu->arch.nmi_injected = events->nmi.injected;
if (events->flags & KVM_VCPUEVENT_VALID_NMI_PENDING)
vcpu->arch.nmi_pending = events->nmi.pending;
kvm_x86_ops->set_nmi_mask(vcpu, events->nmi.masked);
if (events->flags & KVM_VCPUEVENT_VALID_SIPI_VECTOR &&
kvm_vcpu_has_lapic(vcpu))
vcpu->arch.apic->sipi_vector = events->sipi_vector;
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
}
static void kvm_vcpu_ioctl_x86_get_debugregs(struct kvm_vcpu *vcpu,
struct kvm_debugregs *dbgregs)
{
memcpy(dbgregs->db, vcpu->arch.db, sizeof(vcpu->arch.db));
dbgregs->dr6 = vcpu->arch.dr6;
dbgregs->dr7 = vcpu->arch.dr7;
dbgregs->flags = 0;
memset(&dbgregs->reserved, 0, sizeof(dbgregs->reserved));
}
static int kvm_vcpu_ioctl_x86_set_debugregs(struct kvm_vcpu *vcpu,
struct kvm_debugregs *dbgregs)
{
if (dbgregs->flags)
return -EINVAL;
memcpy(vcpu->arch.db, dbgregs->db, sizeof(vcpu->arch.db));
vcpu->arch.dr6 = dbgregs->dr6;
vcpu->arch.dr7 = dbgregs->dr7;
return 0;
}
static void kvm_vcpu_ioctl_x86_get_xsave(struct kvm_vcpu *vcpu,
struct kvm_xsave *guest_xsave)
{
if (cpu_has_xsave)
memcpy(guest_xsave->region,
&vcpu->arch.guest_fpu.state->xsave,
xstate_size);
else {
memcpy(guest_xsave->region,
&vcpu->arch.guest_fpu.state->fxsave,
sizeof(struct i387_fxsave_struct));
*(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)] =
XSTATE_FPSSE;
}
}
static int kvm_vcpu_ioctl_x86_set_xsave(struct kvm_vcpu *vcpu,
struct kvm_xsave *guest_xsave)
{
u64 xstate_bv =
*(u64 *)&guest_xsave->region[XSAVE_HDR_OFFSET / sizeof(u32)];
if (cpu_has_xsave)
memcpy(&vcpu->arch.guest_fpu.state->xsave,
guest_xsave->region, xstate_size);
else {
if (xstate_bv & ~XSTATE_FPSSE)
return -EINVAL;
memcpy(&vcpu->arch.guest_fpu.state->fxsave,
guest_xsave->region, sizeof(struct i387_fxsave_struct));
}
return 0;
}
static void kvm_vcpu_ioctl_x86_get_xcrs(struct kvm_vcpu *vcpu,
struct kvm_xcrs *guest_xcrs)
{
if (!cpu_has_xsave) {
guest_xcrs->nr_xcrs = 0;
return;
}
guest_xcrs->nr_xcrs = 1;
guest_xcrs->flags = 0;
guest_xcrs->xcrs[0].xcr = XCR_XFEATURE_ENABLED_MASK;
guest_xcrs->xcrs[0].value = vcpu->arch.xcr0;
}
static int kvm_vcpu_ioctl_x86_set_xcrs(struct kvm_vcpu *vcpu,
struct kvm_xcrs *guest_xcrs)
{
int i, r = 0;
if (!cpu_has_xsave)
return -EINVAL;
if (guest_xcrs->nr_xcrs > KVM_MAX_XCRS || guest_xcrs->flags)
return -EINVAL;
for (i = 0; i < guest_xcrs->nr_xcrs; i++)
/* Only support XCR0 currently */
if (guest_xcrs->xcrs[0].xcr == XCR_XFEATURE_ENABLED_MASK) {
r = __kvm_set_xcr(vcpu, XCR_XFEATURE_ENABLED_MASK,
guest_xcrs->xcrs[0].value);
break;
}
if (r)
r = -EINVAL;
return r;
}
/*
* kvm_set_guest_paused() indicates to the guest kernel that it has been
* stopped by the hypervisor. This function will be called from the host only.
* EINVAL is returned when the host attempts to set the flag for a guest that
* does not support pv clocks.
*/
static int kvm_set_guest_paused(struct kvm_vcpu *vcpu)
{
if (!vcpu->arch.pv_time_enabled)
return -EINVAL;
vcpu->arch.pvclock_set_guest_stopped_request = true;
kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
return 0;
}
long kvm_arch_vcpu_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm_vcpu *vcpu = filp->private_data;
void __user *argp = (void __user *)arg;
int r;
union {
struct kvm_lapic_state *lapic;
struct kvm_xsave *xsave;
struct kvm_xcrs *xcrs;
void *buffer;
} u;
u.buffer = NULL;
switch (ioctl) {
case KVM_GET_LAPIC: {
r = -EINVAL;
if (!vcpu->arch.apic)
goto out;
u.lapic = kzalloc(sizeof(struct kvm_lapic_state), GFP_KERNEL);
r = -ENOMEM;
if (!u.lapic)
goto out;
r = kvm_vcpu_ioctl_get_lapic(vcpu, u.lapic);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, u.lapic, sizeof(struct kvm_lapic_state)))
goto out;
r = 0;
break;
}
case KVM_SET_LAPIC: {
r = -EINVAL;
if (!vcpu->arch.apic)
goto out;
u.lapic = memdup_user(argp, sizeof(*u.lapic));
if (IS_ERR(u.lapic))
return PTR_ERR(u.lapic);
r = kvm_vcpu_ioctl_set_lapic(vcpu, u.lapic);
break;
}
case KVM_INTERRUPT: {
struct kvm_interrupt irq;
r = -EFAULT;
if (copy_from_user(&irq, argp, sizeof irq))
goto out;
r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
break;
}
case KVM_NMI: {
r = kvm_vcpu_ioctl_nmi(vcpu);
break;
}
case KVM_SET_CPUID: {
struct kvm_cpuid __user *cpuid_arg = argp;
struct kvm_cpuid cpuid;
r = -EFAULT;
if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
goto out;
r = kvm_vcpu_ioctl_set_cpuid(vcpu, &cpuid, cpuid_arg->entries);
break;
}
case KVM_SET_CPUID2: {
struct kvm_cpuid2 __user *cpuid_arg = argp;
struct kvm_cpuid2 cpuid;
r = -EFAULT;
if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
goto out;
r = kvm_vcpu_ioctl_set_cpuid2(vcpu, &cpuid,
cpuid_arg->entries);
break;
}
case KVM_GET_CPUID2: {
struct kvm_cpuid2 __user *cpuid_arg = argp;
struct kvm_cpuid2 cpuid;
r = -EFAULT;
if (copy_from_user(&cpuid, cpuid_arg, sizeof cpuid))
goto out;
r = kvm_vcpu_ioctl_get_cpuid2(vcpu, &cpuid,
cpuid_arg->entries);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(cpuid_arg, &cpuid, sizeof cpuid))
goto out;
r = 0;
break;
}
case KVM_GET_MSRS:
r = msr_io(vcpu, argp, kvm_get_msr, 1);
break;
case KVM_SET_MSRS:
r = msr_io(vcpu, argp, do_set_msr, 0);
break;
case KVM_TPR_ACCESS_REPORTING: {
struct kvm_tpr_access_ctl tac;
r = -EFAULT;
if (copy_from_user(&tac, argp, sizeof tac))
goto out;
r = vcpu_ioctl_tpr_access_reporting(vcpu, &tac);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &tac, sizeof tac))
goto out;
r = 0;
break;
};
case KVM_SET_VAPIC_ADDR: {
struct kvm_vapic_addr va;
r = -EINVAL;
if (!irqchip_in_kernel(vcpu->kvm))
goto out;
r = -EFAULT;
if (copy_from_user(&va, argp, sizeof va))
goto out;
r = 0;
kvm_lapic_set_vapic_addr(vcpu, va.vapic_addr);
break;
}
case KVM_X86_SETUP_MCE: {
u64 mcg_cap;
r = -EFAULT;
if (copy_from_user(&mcg_cap, argp, sizeof mcg_cap))
goto out;
r = kvm_vcpu_ioctl_x86_setup_mce(vcpu, mcg_cap);
break;
}
case KVM_X86_SET_MCE: {
struct kvm_x86_mce mce;
r = -EFAULT;
if (copy_from_user(&mce, argp, sizeof mce))
goto out;
r = kvm_vcpu_ioctl_x86_set_mce(vcpu, &mce);
break;
}
case KVM_GET_VCPU_EVENTS: {
struct kvm_vcpu_events events;
kvm_vcpu_ioctl_x86_get_vcpu_events(vcpu, &events);
r = -EFAULT;
if (copy_to_user(argp, &events, sizeof(struct kvm_vcpu_events)))
break;
r = 0;
break;
}
case KVM_SET_VCPU_EVENTS: {
struct kvm_vcpu_events events;
r = -EFAULT;
if (copy_from_user(&events, argp, sizeof(struct kvm_vcpu_events)))
break;
r = kvm_vcpu_ioctl_x86_set_vcpu_events(vcpu, &events);
break;
}
case KVM_GET_DEBUGREGS: {
struct kvm_debugregs dbgregs;
kvm_vcpu_ioctl_x86_get_debugregs(vcpu, &dbgregs);
r = -EFAULT;
if (copy_to_user(argp, &dbgregs,
sizeof(struct kvm_debugregs)))
break;
r = 0;
break;
}
case KVM_SET_DEBUGREGS: {
struct kvm_debugregs dbgregs;
r = -EFAULT;
if (copy_from_user(&dbgregs, argp,
sizeof(struct kvm_debugregs)))
break;
r = kvm_vcpu_ioctl_x86_set_debugregs(vcpu, &dbgregs);
break;
}
case KVM_GET_XSAVE: {
u.xsave = kzalloc(sizeof(struct kvm_xsave), GFP_KERNEL);
r = -ENOMEM;
if (!u.xsave)
break;
kvm_vcpu_ioctl_x86_get_xsave(vcpu, u.xsave);
r = -EFAULT;
if (copy_to_user(argp, u.xsave, sizeof(struct kvm_xsave)))
break;
r = 0;
break;
}
case KVM_SET_XSAVE: {
u.xsave = memdup_user(argp, sizeof(*u.xsave));
if (IS_ERR(u.xsave))
return PTR_ERR(u.xsave);
r = kvm_vcpu_ioctl_x86_set_xsave(vcpu, u.xsave);
break;
}
case KVM_GET_XCRS: {
u.xcrs = kzalloc(sizeof(struct kvm_xcrs), GFP_KERNEL);
r = -ENOMEM;
if (!u.xcrs)
break;
kvm_vcpu_ioctl_x86_get_xcrs(vcpu, u.xcrs);
r = -EFAULT;
if (copy_to_user(argp, u.xcrs,
sizeof(struct kvm_xcrs)))
break;
r = 0;
break;
}
case KVM_SET_XCRS: {
u.xcrs = memdup_user(argp, sizeof(*u.xcrs));
if (IS_ERR(u.xcrs))
return PTR_ERR(u.xcrs);
r = kvm_vcpu_ioctl_x86_set_xcrs(vcpu, u.xcrs);
break;
}
case KVM_SET_TSC_KHZ: {
u32 user_tsc_khz;
r = -EINVAL;
user_tsc_khz = (u32)arg;
if (user_tsc_khz >= kvm_max_guest_tsc_khz)
goto out;
if (user_tsc_khz == 0)
user_tsc_khz = tsc_khz;
kvm_set_tsc_khz(vcpu, user_tsc_khz);
r = 0;
goto out;
}
case KVM_GET_TSC_KHZ: {
r = vcpu->arch.virtual_tsc_khz;
goto out;
}
case KVM_KVMCLOCK_CTRL: {
r = kvm_set_guest_paused(vcpu);
goto out;
}
default:
r = -EINVAL;
}
out:
kfree(u.buffer);
return r;
}
int kvm_arch_vcpu_fault(struct kvm_vcpu *vcpu, struct vm_fault *vmf)
{
return VM_FAULT_SIGBUS;
}
static int kvm_vm_ioctl_set_tss_addr(struct kvm *kvm, unsigned long addr)
{
int ret;
if (addr > (unsigned int)(-3 * PAGE_SIZE))
return -EINVAL;
ret = kvm_x86_ops->set_tss_addr(kvm, addr);
return ret;
}
static int kvm_vm_ioctl_set_identity_map_addr(struct kvm *kvm,
u64 ident_addr)
{
kvm->arch.ept_identity_map_addr = ident_addr;
return 0;
}
static int kvm_vm_ioctl_set_nr_mmu_pages(struct kvm *kvm,
u32 kvm_nr_mmu_pages)
{
if (kvm_nr_mmu_pages < KVM_MIN_ALLOC_MMU_PAGES)
return -EINVAL;
mutex_lock(&kvm->slots_lock);
kvm_mmu_change_mmu_pages(kvm, kvm_nr_mmu_pages);
kvm->arch.n_requested_mmu_pages = kvm_nr_mmu_pages;
mutex_unlock(&kvm->slots_lock);
return 0;
}
static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
{
return kvm->arch.n_max_mmu_pages;
}
static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
{
int r;
r = 0;
switch (chip->chip_id) {
case KVM_IRQCHIP_PIC_MASTER:
memcpy(&chip->chip.pic,
&pic_irqchip(kvm)->pics[0],
sizeof(struct kvm_pic_state));
break;
case KVM_IRQCHIP_PIC_SLAVE:
memcpy(&chip->chip.pic,
&pic_irqchip(kvm)->pics[1],
sizeof(struct kvm_pic_state));
break;
case KVM_IRQCHIP_IOAPIC:
r = kvm_get_ioapic(kvm, &chip->chip.ioapic);
break;
default:
r = -EINVAL;
break;
}
return r;
}
static int kvm_vm_ioctl_set_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
{
int r;
r = 0;
switch (chip->chip_id) {
case KVM_IRQCHIP_PIC_MASTER:
spin_lock(&pic_irqchip(kvm)->lock);
memcpy(&pic_irqchip(kvm)->pics[0],
&chip->chip.pic,
sizeof(struct kvm_pic_state));
spin_unlock(&pic_irqchip(kvm)->lock);
break;
case KVM_IRQCHIP_PIC_SLAVE:
spin_lock(&pic_irqchip(kvm)->lock);
memcpy(&pic_irqchip(kvm)->pics[1],
&chip->chip.pic,
sizeof(struct kvm_pic_state));
spin_unlock(&pic_irqchip(kvm)->lock);
break;
case KVM_IRQCHIP_IOAPIC:
r = kvm_set_ioapic(kvm, &chip->chip.ioapic);
break;
default:
r = -EINVAL;
break;
}
kvm_pic_update_irq(pic_irqchip(kvm));
return r;
}
static int kvm_vm_ioctl_get_pit(struct kvm *kvm, struct kvm_pit_state *ps)
{
int r = 0;
mutex_lock(&kvm->arch.vpit->pit_state.lock);
memcpy(ps, &kvm->arch.vpit->pit_state, sizeof(struct kvm_pit_state));
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
return r;
}
static int kvm_vm_ioctl_set_pit(struct kvm *kvm, struct kvm_pit_state *ps)
{
int r = 0;
mutex_lock(&kvm->arch.vpit->pit_state.lock);
memcpy(&kvm->arch.vpit->pit_state, ps, sizeof(struct kvm_pit_state));
kvm_pit_load_count(kvm, 0, ps->channels[0].count, 0);
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
return r;
}
static int kvm_vm_ioctl_get_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
{
int r = 0;
mutex_lock(&kvm->arch.vpit->pit_state.lock);
memcpy(ps->channels, &kvm->arch.vpit->pit_state.channels,
sizeof(ps->channels));
ps->flags = kvm->arch.vpit->pit_state.flags;
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
memset(&ps->reserved, 0, sizeof(ps->reserved));
return r;
}
static int kvm_vm_ioctl_set_pit2(struct kvm *kvm, struct kvm_pit_state2 *ps)
{
int r = 0, start = 0;
u32 prev_legacy, cur_legacy;
mutex_lock(&kvm->arch.vpit->pit_state.lock);
prev_legacy = kvm->arch.vpit->pit_state.flags & KVM_PIT_FLAGS_HPET_LEGACY;
cur_legacy = ps->flags & KVM_PIT_FLAGS_HPET_LEGACY;
if (!prev_legacy && cur_legacy)
start = 1;
memcpy(&kvm->arch.vpit->pit_state.channels, &ps->channels,
sizeof(kvm->arch.vpit->pit_state.channels));
kvm->arch.vpit->pit_state.flags = ps->flags;
kvm_pit_load_count(kvm, 0, kvm->arch.vpit->pit_state.channels[0].count, start);
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
return r;
}
static int kvm_vm_ioctl_reinject(struct kvm *kvm,
struct kvm_reinject_control *control)
{
if (!kvm->arch.vpit)
return -ENXIO;
mutex_lock(&kvm->arch.vpit->pit_state.lock);
kvm->arch.vpit->pit_state.reinject = control->pit_reinject;
mutex_unlock(&kvm->arch.vpit->pit_state.lock);
return 0;
}
/**
* kvm_vm_ioctl_get_dirty_log - get and clear the log of dirty pages in a slot
* @kvm: kvm instance
* @log: slot id and address to which we copy the log
*
* We need to keep it in mind that VCPU threads can write to the bitmap
* concurrently. So, to avoid losing data, we keep the following order for
* each bit:
*
* 1. Take a snapshot of the bit and clear it if needed.
* 2. Write protect the corresponding page.
* 3. Flush TLB's if needed.
* 4. Copy the snapshot to the userspace.
*
* Between 2 and 3, the guest may write to the page using the remaining TLB
* entry. This is not a problem because the page will be reported dirty at
* step 4 using the snapshot taken before and step 3 ensures that successive
* writes will be logged for the next call.
*/
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
int r;
struct kvm_memory_slot *memslot;
unsigned long n, i;
unsigned long *dirty_bitmap;
unsigned long *dirty_bitmap_buffer;
bool is_dirty = false;
mutex_lock(&kvm->slots_lock);
r = -EINVAL;
if (log->slot >= KVM_USER_MEM_SLOTS)
goto out;
memslot = id_to_memslot(kvm->memslots, log->slot);
dirty_bitmap = memslot->dirty_bitmap;
r = -ENOENT;
if (!dirty_bitmap)
goto out;
n = kvm_dirty_bitmap_bytes(memslot);
dirty_bitmap_buffer = dirty_bitmap + n / sizeof(long);
memset(dirty_bitmap_buffer, 0, n);
spin_lock(&kvm->mmu_lock);
for (i = 0; i < n / sizeof(long); i++) {
unsigned long mask;
gfn_t offset;
if (!dirty_bitmap[i])
continue;
is_dirty = true;
mask = xchg(&dirty_bitmap[i], 0);
dirty_bitmap_buffer[i] = mask;
offset = i * BITS_PER_LONG;
kvm_mmu_write_protect_pt_masked(kvm, memslot, offset, mask);
}
if (is_dirty)
kvm_flush_remote_tlbs(kvm);
spin_unlock(&kvm->mmu_lock);
r = -EFAULT;
if (copy_to_user(log->dirty_bitmap, dirty_bitmap_buffer, n))
goto out;
r = 0;
out:
mutex_unlock(&kvm->slots_lock);
return r;
}
int kvm_vm_ioctl_irq_line(struct kvm *kvm, struct kvm_irq_level *irq_event,
bool line_status)
{
if (!irqchip_in_kernel(kvm))
return -ENXIO;
irq_event->status = kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID,
irq_event->irq, irq_event->level,
line_status);
return 0;
}
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
struct kvm *kvm = filp->private_data;
void __user *argp = (void __user *)arg;
int r = -ENOTTY;
/*
* This union makes it completely explicit to gcc-3.x
* that these two variables' stack usage should be
* combined, not added together.
*/
union {
struct kvm_pit_state ps;
struct kvm_pit_state2 ps2;
struct kvm_pit_config pit_config;
} u;
switch (ioctl) {
case KVM_SET_TSS_ADDR:
r = kvm_vm_ioctl_set_tss_addr(kvm, arg);
break;
case KVM_SET_IDENTITY_MAP_ADDR: {
u64 ident_addr;
r = -EFAULT;
if (copy_from_user(&ident_addr, argp, sizeof ident_addr))
goto out;
r = kvm_vm_ioctl_set_identity_map_addr(kvm, ident_addr);
break;
}
case KVM_SET_NR_MMU_PAGES:
r = kvm_vm_ioctl_set_nr_mmu_pages(kvm, arg);
break;
case KVM_GET_NR_MMU_PAGES:
r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
break;
case KVM_CREATE_IRQCHIP: {
struct kvm_pic *vpic;
mutex_lock(&kvm->lock);
r = -EEXIST;
if (kvm->arch.vpic)
goto create_irqchip_unlock;
r = -EINVAL;
if (atomic_read(&kvm->online_vcpus))
goto create_irqchip_unlock;
r = -ENOMEM;
vpic = kvm_create_pic(kvm);
if (vpic) {
r = kvm_ioapic_init(kvm);
if (r) {
mutex_lock(&kvm->slots_lock);
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
&vpic->dev_master);
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
&vpic->dev_slave);
kvm_io_bus_unregister_dev(kvm, KVM_PIO_BUS,
&vpic->dev_eclr);
mutex_unlock(&kvm->slots_lock);
kfree(vpic);
goto create_irqchip_unlock;
}
} else
goto create_irqchip_unlock;
smp_wmb();
kvm->arch.vpic = vpic;
smp_wmb();
r = kvm_setup_default_irq_routing(kvm);
if (r) {
mutex_lock(&kvm->slots_lock);
mutex_lock(&kvm->irq_lock);
kvm_ioapic_destroy(kvm);
kvm_destroy_pic(kvm);
mutex_unlock(&kvm->irq_lock);
mutex_unlock(&kvm->slots_lock);
}
create_irqchip_unlock:
mutex_unlock(&kvm->lock);
break;
}
case KVM_CREATE_PIT:
u.pit_config.flags = KVM_PIT_SPEAKER_DUMMY;
goto create_pit;
case KVM_CREATE_PIT2:
r = -EFAULT;
if (copy_from_user(&u.pit_config, argp,
sizeof(struct kvm_pit_config)))
goto out;
create_pit:
mutex_lock(&kvm->slots_lock);
r = -EEXIST;
if (kvm->arch.vpit)
goto create_pit_unlock;
r = -ENOMEM;
kvm->arch.vpit = kvm_create_pit(kvm, u.pit_config.flags);
if (kvm->arch.vpit)
r = 0;
create_pit_unlock:
mutex_unlock(&kvm->slots_lock);
break;
case KVM_GET_IRQCHIP: {
/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
struct kvm_irqchip *chip;
chip = memdup_user(argp, sizeof(*chip));
if (IS_ERR(chip)) {
r = PTR_ERR(chip);
goto out;
}
r = -ENXIO;
if (!irqchip_in_kernel(kvm))
goto get_irqchip_out;
r = kvm_vm_ioctl_get_irqchip(kvm, chip);
if (r)
goto get_irqchip_out;
r = -EFAULT;
if (copy_to_user(argp, chip, sizeof *chip))
goto get_irqchip_out;
r = 0;
get_irqchip_out:
kfree(chip);
break;
}
case KVM_SET_IRQCHIP: {
/* 0: PIC master, 1: PIC slave, 2: IOAPIC */
struct kvm_irqchip *chip;
chip = memdup_user(argp, sizeof(*chip));
if (IS_ERR(chip)) {
r = PTR_ERR(chip);
goto out;
}
r = -ENXIO;
if (!irqchip_in_kernel(kvm))
goto set_irqchip_out;
r = kvm_vm_ioctl_set_irqchip(kvm, chip);
if (r)
goto set_irqchip_out;
r = 0;
set_irqchip_out:
kfree(chip);
break;
}
case KVM_GET_PIT: {
r = -EFAULT;
if (copy_from_user(&u.ps, argp, sizeof(struct kvm_pit_state)))
goto out;
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_get_pit(kvm, &u.ps);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &u.ps, sizeof(struct kvm_pit_state)))
goto out;
r = 0;
break;
}
case KVM_SET_PIT: {
r = -EFAULT;
if (copy_from_user(&u.ps, argp, sizeof u.ps))
goto out;
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_set_pit(kvm, &u.ps);
break;
}
case KVM_GET_PIT2: {
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_get_pit2(kvm, &u.ps2);
if (r)
goto out;
r = -EFAULT;
if (copy_to_user(argp, &u.ps2, sizeof(u.ps2)))
goto out;
r = 0;
break;
}
case KVM_SET_PIT2: {
r = -EFAULT;
if (copy_from_user(&u.ps2, argp, sizeof(u.ps2)))
goto out;
r = -ENXIO;
if (!kvm->arch.vpit)
goto out;
r = kvm_vm_ioctl_set_pit2(kvm, &u.ps2);
break;
}
case KVM_REINJECT_CONTROL: {
struct kvm_reinject_control control;
r = -EFAULT;
if (copy_from_user(&control, argp, sizeof(control)))
goto out;
r = kvm_vm_ioctl_reinject(kvm, &control);
break;
}
case KVM_XEN_HVM_CONFIG: {
r = -EFAULT;
if (copy_from_user(&kvm->arch.xen_hvm_config, argp,
sizeof(struct kvm_xen_hvm_config)))
goto out;
r = -EINVAL;
if (kvm->arch.xen_hvm_config.flags)
goto out;
r = 0;
break;
}
case KVM_SET_CLOCK: {
struct kvm_clock_data user_ns;
u64 now_ns;
s64 delta;
r = -EFAULT;
if (copy_from_user(&user_ns, argp, sizeof(user_ns)))
goto out;
r = -EINVAL;
if (user_ns.flags)
goto out;
r = 0;
local_irq_disable();
now_ns = get_kernel_ns();
delta = user_ns.clock - now_ns;
local_irq_enable();
kvm->arch.kvmclock_offset = delta;
break;
}
case KVM_GET_CLOCK: {
struct kvm_clock_data user_ns;
u64 now_ns;
local_irq_disable();
now_ns = get_kernel_ns();
user_ns.clock = kvm->arch.kvmclock_offset + now_ns;
local_irq_enable();
user_ns.flags = 0;
memset(&user_ns.pad, 0, sizeof(user_ns.pad));
r = -EFAULT;
if (copy_to_user(argp, &user_ns, sizeof(user_ns)))
goto out;
r = 0;
break;
}
default:
;
}
out:
return r;
}
static void kvm_init_msr_list(void)
{
u32 dummy[2];
unsigned i, j;
/* skip the first msrs in the list. KVM-specific */
for (i = j = KVM_SAVE_MSRS_BEGIN; i < ARRAY_SIZE(msrs_to_save); i++) {
if (rdmsr_safe(msrs_to_save[i], &dummy[0], &dummy[1]) < 0)
continue;
if (j < i)
msrs_to_save[j] = msrs_to_save[i];
j++;
}
num_msrs_to_save = j;
}
static int vcpu_mmio_write(struct kvm_vcpu *vcpu, gpa_t addr, int len,
const void *v)
{
int handled = 0;
int n;
do {
n = min(len, 8);
if (!(vcpu->arch.apic &&
!kvm_iodevice_write(&vcpu->arch.apic->dev, addr, n, v))
&& kvm_io_bus_write(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
break;
handled += n;
addr += n;
len -= n;
v += n;
} while (len);
return handled;
}
static int vcpu_mmio_read(struct kvm_vcpu *vcpu, gpa_t addr, int len, void *v)
{
int handled = 0;
int n;
do {
n = min(len, 8);
if (!(vcpu->arch.apic &&
!kvm_iodevice_read(&vcpu->arch.apic->dev, addr, n, v))
&& kvm_io_bus_read(vcpu->kvm, KVM_MMIO_BUS, addr, n, v))
break;
trace_kvm_mmio(KVM_TRACE_MMIO_READ, n, addr, *(u64 *)v);
handled += n;
addr += n;
len -= n;
v += n;
} while (len);
return handled;
}
static void kvm_set_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg)
{
kvm_x86_ops->set_segment(vcpu, var, seg);
}
void kvm_get_segment(struct kvm_vcpu *vcpu,
struct kvm_segment *var, int seg)
{
kvm_x86_ops->get_segment(vcpu, var, seg);
}
gpa_t translate_nested_gpa(struct kvm_vcpu *vcpu, gpa_t gpa, u32 access)
{
gpa_t t_gpa;
struct x86_exception exception;
BUG_ON(!mmu_is_nested(vcpu));
/* NPT walks are always user-walks */
access |= PFERR_USER_MASK;
t_gpa = vcpu->arch.mmu.gva_to_gpa(vcpu, gpa, access, &exception);
return t_gpa;
}
gpa_t kvm_mmu_gva_to_gpa_read(struct kvm_vcpu *vcpu, gva_t gva,
struct x86_exception *exception)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
}
gpa_t kvm_mmu_gva_to_gpa_fetch(struct kvm_vcpu *vcpu, gva_t gva,
struct x86_exception *exception)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_FETCH_MASK;
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
}
gpa_t kvm_mmu_gva_to_gpa_write(struct kvm_vcpu *vcpu, gva_t gva,
struct x86_exception *exception)
{
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
access |= PFERR_WRITE_MASK;
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
}
/* uses this to access any guest's mapped memory without checking CPL */
gpa_t kvm_mmu_gva_to_gpa_system(struct kvm_vcpu *vcpu, gva_t gva,
struct x86_exception *exception)
{
return vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, 0, exception);
}
static int kvm_read_guest_virt_helper(gva_t addr, void *val, unsigned int bytes,
struct kvm_vcpu *vcpu, u32 access,
struct x86_exception *exception)
{
void *data = val;
int r = X86EMUL_CONTINUE;
while (bytes) {
gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr, access,
exception);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned toread = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
ret = kvm_read_guest(vcpu->kvm, gpa, data, toread);
if (ret < 0) {
r = X86EMUL_IO_NEEDED;
goto out;
}
bytes -= toread;
data += toread;
addr += toread;
}
out:
return r;
}
/* used for instruction fetching */
static int kvm_fetch_guest_virt(struct x86_emulate_ctxt *ctxt,
gva_t addr, void *val, unsigned int bytes,
struct x86_exception *exception)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
return kvm_read_guest_virt_helper(addr, val, bytes, vcpu,
access | PFERR_FETCH_MASK,
exception);
}
int kvm_read_guest_virt(struct x86_emulate_ctxt *ctxt,
gva_t addr, void *val, unsigned int bytes,
struct x86_exception *exception)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
u32 access = (kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0;
return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, access,
exception);
}
EXPORT_SYMBOL_GPL(kvm_read_guest_virt);
static int kvm_read_guest_virt_system(struct x86_emulate_ctxt *ctxt,
gva_t addr, void *val, unsigned int bytes,
struct x86_exception *exception)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
return kvm_read_guest_virt_helper(addr, val, bytes, vcpu, 0, exception);
}
int kvm_write_guest_virt_system(struct x86_emulate_ctxt *ctxt,
gva_t addr, void *val,
unsigned int bytes,
struct x86_exception *exception)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
void *data = val;
int r = X86EMUL_CONTINUE;
while (bytes) {
gpa_t gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, addr,
PFERR_WRITE_MASK,
exception);
unsigned offset = addr & (PAGE_SIZE-1);
unsigned towrite = min(bytes, (unsigned)PAGE_SIZE - offset);
int ret;
if (gpa == UNMAPPED_GVA)
return X86EMUL_PROPAGATE_FAULT;
ret = kvm_write_guest(vcpu->kvm, gpa, data, towrite);
if (ret < 0) {
r = X86EMUL_IO_NEEDED;
goto out;
}
bytes -= towrite;
data += towrite;
addr += towrite;
}
out:
return r;
}
EXPORT_SYMBOL_GPL(kvm_write_guest_virt_system);
static int vcpu_mmio_gva_to_gpa(struct kvm_vcpu *vcpu, unsigned long gva,
gpa_t *gpa, struct x86_exception *exception,
bool write)
{
u32 access = ((kvm_x86_ops->get_cpl(vcpu) == 3) ? PFERR_USER_MASK : 0)
| (write ? PFERR_WRITE_MASK : 0);
if (vcpu_match_mmio_gva(vcpu, gva)
&& !permission_fault(vcpu->arch.walk_mmu, vcpu->arch.access, access)) {
*gpa = vcpu->arch.mmio_gfn << PAGE_SHIFT |
(gva & (PAGE_SIZE - 1));
trace_vcpu_match_mmio(gva, *gpa, write, false);
return 1;
}
*gpa = vcpu->arch.walk_mmu->gva_to_gpa(vcpu, gva, access, exception);
if (*gpa == UNMAPPED_GVA)
return -1;
/* For APIC access vmexit */
if ((*gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
return 1;
if (vcpu_match_mmio_gpa(vcpu, *gpa)) {
trace_vcpu_match_mmio(gva, *gpa, write, true);
return 1;
}
return 0;
}
int emulator_write_phys(struct kvm_vcpu *vcpu, gpa_t gpa,
const void *val, int bytes)
{
int ret;
ret = kvm_write_guest(vcpu->kvm, gpa, val, bytes);
if (ret < 0)
return 0;
kvm_mmu_pte_write(vcpu, gpa, val, bytes);
return 1;
}
struct read_write_emulator_ops {
int (*read_write_prepare)(struct kvm_vcpu *vcpu, void *val,
int bytes);
int (*read_write_emulate)(struct kvm_vcpu *vcpu, gpa_t gpa,
void *val, int bytes);
int (*read_write_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
int bytes, void *val);
int (*read_write_exit_mmio)(struct kvm_vcpu *vcpu, gpa_t gpa,
void *val, int bytes);
bool write;
};
static int read_prepare(struct kvm_vcpu *vcpu, void *val, int bytes)
{
if (vcpu->mmio_read_completed) {
trace_kvm_mmio(KVM_TRACE_MMIO_READ, bytes,
vcpu->mmio_fragments[0].gpa, *(u64 *)val);
vcpu->mmio_read_completed = 0;
return 1;
}
return 0;
}
static int read_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
void *val, int bytes)
{
return !kvm_read_guest(vcpu->kvm, gpa, val, bytes);
}
static int write_emulate(struct kvm_vcpu *vcpu, gpa_t gpa,
void *val, int bytes)
{
return emulator_write_phys(vcpu, gpa, val, bytes);
}
static int write_mmio(struct kvm_vcpu *vcpu, gpa_t gpa, int bytes, void *val)
{
trace_kvm_mmio(KVM_TRACE_MMIO_WRITE, bytes, gpa, *(u64 *)val);
return vcpu_mmio_write(vcpu, gpa, bytes, val);
}
static int read_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
void *val, int bytes)
{
trace_kvm_mmio(KVM_TRACE_MMIO_READ_UNSATISFIED, bytes, gpa, 0);
return X86EMUL_IO_NEEDED;
}
static int write_exit_mmio(struct kvm_vcpu *vcpu, gpa_t gpa,
void *val, int bytes)
{
struct kvm_mmio_fragment *frag = &vcpu->mmio_fragments[0];
memcpy(vcpu->run->mmio.data, frag->data, min(8u, frag->len));
return X86EMUL_CONTINUE;
}
static const struct read_write_emulator_ops read_emultor = {
.read_write_prepare = read_prepare,
.read_write_emulate = read_emulate,
.read_write_mmio = vcpu_mmio_read,
.read_write_exit_mmio = read_exit_mmio,
};
static const struct read_write_emulator_ops write_emultor = {
.read_write_emulate = write_emulate,
.read_write_mmio = write_mmio,
.read_write_exit_mmio = write_exit_mmio,
.write = true,
};
static int emulator_read_write_onepage(unsigned long addr, void *val,
unsigned int bytes,
struct x86_exception *exception,
struct kvm_vcpu *vcpu,
const struct read_write_emulator_ops *ops)
{
gpa_t gpa;
int handled, ret;
bool write = ops->write;
struct kvm_mmio_fragment *frag;
ret = vcpu_mmio_gva_to_gpa(vcpu, addr, &gpa, exception, write);
if (ret < 0)
return X86EMUL_PROPAGATE_FAULT;
/* For APIC access vmexit */
if (ret)
goto mmio;
if (ops->read_write_emulate(vcpu, gpa, val, bytes))
return X86EMUL_CONTINUE;
mmio:
/*
* Is this MMIO handled locally?
*/
handled = ops->read_write_mmio(vcpu, gpa, bytes, val);
if (handled == bytes)
return X86EMUL_CONTINUE;
gpa += handled;
bytes -= handled;
val += handled;
WARN_ON(vcpu->mmio_nr_fragments >= KVM_MAX_MMIO_FRAGMENTS);
frag = &vcpu->mmio_fragments[vcpu->mmio_nr_fragments++];
frag->gpa = gpa;
frag->data = val;
frag->len = bytes;
return X86EMUL_CONTINUE;
}
int emulator_read_write(struct x86_emulate_ctxt *ctxt, unsigned long addr,
void *val, unsigned int bytes,
struct x86_exception *exception,
const struct read_write_emulator_ops *ops)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
gpa_t gpa;
int rc;
if (ops->read_write_prepare &&
ops->read_write_prepare(vcpu, val, bytes))
return X86EMUL_CONTINUE;
vcpu->mmio_nr_fragments = 0;
/* Crossing a page boundary? */
if (((addr + bytes - 1) ^ addr) & PAGE_MASK) {
int now;
now = -addr & ~PAGE_MASK;
rc = emulator_read_write_onepage(addr, val, now, exception,
vcpu, ops);
if (rc != X86EMUL_CONTINUE)
return rc;
addr += now;
val += now;
bytes -= now;
}
rc = emulator_read_write_onepage(addr, val, bytes, exception,
vcpu, ops);
if (rc != X86EMUL_CONTINUE)
return rc;
if (!vcpu->mmio_nr_fragments)
return rc;
gpa = vcpu->mmio_fragments[0].gpa;
vcpu->mmio_needed = 1;
vcpu->mmio_cur_fragment = 0;
vcpu->run->mmio.len = min(8u, vcpu->mmio_fragments[0].len);
vcpu->run->mmio.is_write = vcpu->mmio_is_write = ops->write;
vcpu->run->exit_reason = KVM_EXIT_MMIO;
vcpu->run->mmio.phys_addr = gpa;
return ops->read_write_exit_mmio(vcpu, gpa, val, bytes);
}
static int emulator_read_emulated(struct x86_emulate_ctxt *ctxt,
unsigned long addr,
void *val,
unsigned int bytes,
struct x86_exception *exception)
{
return emulator_read_write(ctxt, addr, val, bytes,
exception, &read_emultor);
}
int emulator_write_emulated(struct x86_emulate_ctxt *ctxt,
unsigned long addr,
const void *val,
unsigned int bytes,
struct x86_exception *exception)
{
return emulator_read_write(ctxt, addr, (void *)val, bytes,
exception, &write_emultor);
}
#define CMPXCHG_TYPE(t, ptr, old, new) \
(cmpxchg((t *)(ptr), *(t *)(old), *(t *)(new)) == *(t *)(old))
#ifdef CONFIG_X86_64
# define CMPXCHG64(ptr, old, new) CMPXCHG_TYPE(u64, ptr, old, new)
#else
# define CMPXCHG64(ptr, old, new) \
(cmpxchg64((u64 *)(ptr), *(u64 *)(old), *(u64 *)(new)) == *(u64 *)(old))
#endif
static int emulator_cmpxchg_emulated(struct x86_emulate_ctxt *ctxt,
unsigned long addr,
const void *old,
const void *new,
unsigned int bytes,
struct x86_exception *exception)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
gpa_t gpa;
struct page *page;
char *kaddr;
bool exchanged;
/* guests cmpxchg8b have to be emulated atomically */
if (bytes > 8 || (bytes & (bytes - 1)))
goto emul_write;
gpa = kvm_mmu_gva_to_gpa_write(vcpu, addr, NULL);
if (gpa == UNMAPPED_GVA ||
(gpa & PAGE_MASK) == APIC_DEFAULT_PHYS_BASE)
goto emul_write;
if (((gpa + bytes - 1) & PAGE_MASK) != (gpa & PAGE_MASK))
goto emul_write;
page = gfn_to_page(vcpu->kvm, gpa >> PAGE_SHIFT);
if (is_error_page(page))
goto emul_write;
kaddr = kmap_atomic(page);
kaddr += offset_in_page(gpa);
switch (bytes) {
case 1:
exchanged = CMPXCHG_TYPE(u8, kaddr, old, new);
break;
case 2:
exchanged = CMPXCHG_TYPE(u16, kaddr, old, new);
break;
case 4:
exchanged = CMPXCHG_TYPE(u32, kaddr, old, new);
break;
case 8:
exchanged = CMPXCHG64(kaddr, old, new);
break;
default:
BUG();
}
kunmap_atomic(kaddr);
kvm_release_page_dirty(page);
if (!exchanged)
return X86EMUL_CMPXCHG_FAILED;
kvm_mmu_pte_write(vcpu, gpa, new, bytes);
return X86EMUL_CONTINUE;
emul_write:
printk_once(KERN_WARNING "kvm: emulating exchange as write\n");
return emulator_write_emulated(ctxt, addr, new, bytes, exception);
}
static int kernel_pio(struct kvm_vcpu *vcpu, void *pd)
{
/* TODO: String I/O for in kernel device */
int r;
if (vcpu->arch.pio.in)
r = kvm_io_bus_read(vcpu->kvm, KVM_PIO_BUS, vcpu->arch.pio.port,
vcpu->arch.pio.size, pd);
else
r = kvm_io_bus_write(vcpu->kvm, KVM_PIO_BUS,
vcpu->arch.pio.port, vcpu->arch.pio.size,
pd);
return r;
}
static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
unsigned short port, void *val,
unsigned int count, bool in)
{
trace_kvm_pio(!in, port, size, count);
vcpu->arch.pio.port = port;
vcpu->arch.pio.in = in;
vcpu->arch.pio.count = count;
vcpu->arch.pio.size = size;
if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
vcpu->arch.pio.count = 0;
return 1;
}
vcpu->run->exit_reason = KVM_EXIT_IO;
vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
vcpu->run->io.size = size;
vcpu->run->io.data_offset = KVM_PIO_PAGE_OFFSET * PAGE_SIZE;
vcpu->run->io.count = count;
vcpu->run->io.port = port;
return 0;
}
static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
int size, unsigned short port, void *val,
unsigned int count)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
int ret;
if (vcpu->arch.pio.count)
goto data_avail;
ret = emulator_pio_in_out(vcpu, size, port, val, count, true);
if (ret) {
data_avail:
memcpy(val, vcpu->arch.pio_data, size * count);
vcpu->arch.pio.count = 0;
return 1;
}
return 0;
}
static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,
int size, unsigned short port,
const void *val, unsigned int count)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
memcpy(vcpu->arch.pio_data, val, size * count);
return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
}
static unsigned long get_segment_base(struct kvm_vcpu *vcpu, int seg)
{
return kvm_x86_ops->get_segment_base(vcpu, seg);
}
static void emulator_invlpg(struct x86_emulate_ctxt *ctxt, ulong address)
{
kvm_mmu_invlpg(emul_to_vcpu(ctxt), address);
}
int kvm_emulate_wbinvd(struct kvm_vcpu *vcpu)
{
if (!need_emulate_wbinvd(vcpu))
return X86EMUL_CONTINUE;
if (kvm_x86_ops->has_wbinvd_exit()) {
int cpu = get_cpu();
cpumask_set_cpu(cpu, vcpu->arch.wbinvd_dirty_mask);
smp_call_function_many(vcpu->arch.wbinvd_dirty_mask,
wbinvd_ipi, NULL, 1);
put_cpu();
cpumask_clear(vcpu->arch.wbinvd_dirty_mask);
} else
wbinvd();
return X86EMUL_CONTINUE;
}
EXPORT_SYMBOL_GPL(kvm_emulate_wbinvd);
static void emulator_wbinvd(struct x86_emulate_ctxt *ctxt)
{
kvm_emulate_wbinvd(emul_to_vcpu(ctxt));
}
int emulator_get_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long *dest)
{
return _kvm_get_dr(emul_to_vcpu(ctxt), dr, dest);
}
int emulator_set_dr(struct x86_emulate_ctxt *ctxt, int dr, unsigned long value)
{
return __kvm_set_dr(emul_to_vcpu(ctxt), dr, value);
}
static u64 mk_cr_64(u64 curr_cr, u32 new_val)
{
return (curr_cr & ~((1ULL << 32) - 1)) | new_val;
}
static unsigned long emulator_get_cr(struct x86_emulate_ctxt *ctxt, int cr)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
unsigned long value;
switch (cr) {
case 0:
value = kvm_read_cr0(vcpu);
break;
case 2:
value = vcpu->arch.cr2;
break;
case 3:
value = kvm_read_cr3(vcpu);
break;
case 4:
value = kvm_read_cr4(vcpu);
break;
case 8:
value = kvm_get_cr8(vcpu);
break;
default:
kvm_err("%s: unexpected cr %u\n", __func__, cr);
return 0;
}
return value;
}
static int emulator_set_cr(struct x86_emulate_ctxt *ctxt, int cr, ulong val)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
int res = 0;
switch (cr) {
case 0:
res = kvm_set_cr0(vcpu, mk_cr_64(kvm_read_cr0(vcpu), val));
break;
case 2:
vcpu->arch.cr2 = val;
break;
case 3:
res = kvm_set_cr3(vcpu, val);
break;
case 4:
res = kvm_set_cr4(vcpu, mk_cr_64(kvm_read_cr4(vcpu), val));
break;
case 8:
res = kvm_set_cr8(vcpu, val);
break;
default:
kvm_err("%s: unexpected cr %u\n", __func__, cr);
res = -1;
}
return res;
}
static void emulator_set_rflags(struct x86_emulate_ctxt *ctxt, ulong val)
{
kvm_set_rflags(emul_to_vcpu(ctxt), val);
}
static int emulator_get_cpl(struct x86_emulate_ctxt *ctxt)
{
return kvm_x86_ops->get_cpl(emul_to_vcpu(ctxt));
}
static void emulator_get_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
{
kvm_x86_ops->get_gdt(emul_to_vcpu(ctxt), dt);
}
static void emulator_get_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
{
kvm_x86_ops->get_idt(emul_to_vcpu(ctxt), dt);
}
static void emulator_set_gdt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
{
kvm_x86_ops->set_gdt(emul_to_vcpu(ctxt), dt);
}
static void emulator_set_idt(struct x86_emulate_ctxt *ctxt, struct desc_ptr *dt)
{
kvm_x86_ops->set_idt(emul_to_vcpu(ctxt), dt);
}
static unsigned long emulator_get_cached_segment_base(
struct x86_emulate_ctxt *ctxt, int seg)
{
return get_segment_base(emul_to_vcpu(ctxt), seg);
}
static bool emulator_get_segment(struct x86_emulate_ctxt *ctxt, u16 *selector,
struct desc_struct *desc, u32 *base3,
int seg)
{
struct kvm_segment var;
kvm_get_segment(emul_to_vcpu(ctxt), &var, seg);
*selector = var.selector;
if (var.unusable) {
memset(desc, 0, sizeof(*desc));
return false;
}
if (var.g)
var.limit >>= 12;
set_desc_limit(desc, var.limit);
set_desc_base(desc, (unsigned long)var.base);
#ifdef CONFIG_X86_64
if (base3)
*base3 = var.base >> 32;
#endif
desc->type = var.type;
desc->s = var.s;
desc->dpl = var.dpl;
desc->p = var.present;
desc->avl = var.avl;
desc->l = var.l;
desc->d = var.db;
desc->g = var.g;
return true;
}
static void emulator_set_segment(struct x86_emulate_ctxt *ctxt, u16 selector,
struct desc_struct *desc, u32 base3,
int seg)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
struct kvm_segment var;
var.selector = selector;
var.base = get_desc_base(desc);
#ifdef CONFIG_X86_64
var.base |= ((u64)base3) << 32;
#endif
var.limit = get_desc_limit(desc);
if (desc->g)
var.limit = (var.limit << 12) | 0xfff;
var.type = desc->type;
var.present = desc->p;
var.dpl = desc->dpl;
var.db = desc->d;
var.s = desc->s;
var.l = desc->l;
var.g = desc->g;
var.avl = desc->avl;
var.present = desc->p;
var.unusable = !var.present;
var.padding = 0;
kvm_set_segment(vcpu, &var, seg);
return;
}
static int emulator_get_msr(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 *pdata)
{
return kvm_get_msr(emul_to_vcpu(ctxt), msr_index, pdata);
}
static int emulator_set_msr(struct x86_emulate_ctxt *ctxt,
u32 msr_index, u64 data)
{
struct msr_data msr;
msr.data = data;
msr.index = msr_index;
msr.host_initiated = false;
return kvm_set_msr(emul_to_vcpu(ctxt), &msr);
}
static int emulator_read_pmc(struct x86_emulate_ctxt *ctxt,
u32 pmc, u64 *pdata)
{
return kvm_pmu_read_pmc(emul_to_vcpu(ctxt), pmc, pdata);
}
static void emulator_halt(struct x86_emulate_ctxt *ctxt)
{
emul_to_vcpu(ctxt)->arch.halt_request = 1;
}
static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)
{
preempt_disable();
kvm_load_guest_fpu(emul_to_vcpu(ctxt));
/*
* CR0.TS may reference the host fpu state, not the guest fpu state,
* so it may be clear at this point.
*/
clts();
}
static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)
{
preempt_enable();
}
static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
struct x86_instruction_info *info,
enum x86_intercept_stage stage)
{
return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
}
static void emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
{
kvm_cpuid(emul_to_vcpu(ctxt), eax, ebx, ecx, edx);
}
static ulong emulator_read_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg)
{
return kvm_register_read(emul_to_vcpu(ctxt), reg);
}
static void emulator_write_gpr(struct x86_emulate_ctxt *ctxt, unsigned reg, ulong val)
{
kvm_register_write(emul_to_vcpu(ctxt), reg, val);
}
static const struct x86_emulate_ops emulate_ops = {
.read_gpr = emulator_read_gpr,
.write_gpr = emulator_write_gpr,
.read_std = kvm_read_guest_virt_system,
.write_std = kvm_write_guest_virt_system,
.fetch = kvm_fetch_guest_virt,
.read_emulated = emulator_read_emulated,
.write_emulated = emulator_write_emulated,
.cmpxchg_emulated = emulator_cmpxchg_emulated,
.invlpg = emulator_invlpg,
.pio_in_emulated = emulator_pio_in_emulated,
.pio_out_emulated = emulator_pio_out_emulated,
.get_segment = emulator_get_segment,
.set_segment = emulator_set_segment,
.get_cached_segment_base = emulator_get_cached_segment_base,
.get_gdt = emulator_get_gdt,
.get_idt = emulator_get_idt,
.set_gdt = emulator_set_gdt,
.set_idt = emulator_set_idt,
.get_cr = emulator_get_cr,
.set_cr = emulator_set_cr,
.set_rflags = emulator_set_rflags,
.cpl = emulator_get_cpl,
.get_dr = emulator_get_dr,
.set_dr = emulator_set_dr,
.set_msr = emulator_set_msr,
.get_msr = emulator_get_msr,
.read_pmc = emulator_read_pmc,
.halt = emulator_halt,
.wbinvd = emulator_wbinvd,
.fix_hypercall = emulator_fix_hypercall,
.get_fpu = emulator_get_fpu,
.put_fpu = emulator_put_fpu,
.intercept = emulator_intercept,
.get_cpuid = emulator_get_cpuid,
};
static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
{
u32 int_shadow = kvm_x86_ops->get_interrupt_shadow(vcpu, mask);
/*
* an sti; sti; sequence only disable interrupts for the first
* instruction. So, if the last instruction, be it emulated or
* not, left the system with the INT_STI flag enabled, it
* means that the last instruction is an sti. We should not
* leave the flag on in this case. The same goes for mov ss
*/
if (!(int_shadow & mask))
kvm_x86_ops->set_interrupt_shadow(vcpu, mask);
}
static void inject_emulated_exception(struct kvm_vcpu *vcpu)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
if (ctxt->exception.vector == PF_VECTOR)
kvm_propagate_fault(vcpu, &ctxt->exception);
else if (ctxt->exception.error_code_valid)
kvm_queue_exception_e(vcpu, ctxt->exception.vector,
ctxt->exception.error_code);
else
kvm_queue_exception(vcpu, ctxt->exception.vector);
}
static void init_decode_cache(struct x86_emulate_ctxt *ctxt)
{
memset(&ctxt->twobyte, 0,
(void *)&ctxt->_regs - (void *)&ctxt->twobyte);
ctxt->fetch.start = 0;
ctxt->fetch.end = 0;
ctxt->io_read.pos = 0;
ctxt->io_read.end = 0;
ctxt->mem_read.pos = 0;
ctxt->mem_read.end = 0;
}
static void init_emulate_ctxt(struct kvm_vcpu *vcpu)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
int cs_db, cs_l;
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
ctxt->eflags = kvm_get_rflags(vcpu);
ctxt->eip = kvm_rip_read(vcpu);
ctxt->mode = (!is_protmode(vcpu)) ? X86EMUL_MODE_REAL :
(ctxt->eflags & X86_EFLAGS_VM) ? X86EMUL_MODE_VM86 :
cs_l ? X86EMUL_MODE_PROT64 :
cs_db ? X86EMUL_MODE_PROT32 :
X86EMUL_MODE_PROT16;
ctxt->guest_mode = is_guest_mode(vcpu);
init_decode_cache(ctxt);
vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
}
int kvm_inject_realmode_interrupt(struct kvm_vcpu *vcpu, int irq, int inc_eip)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
int ret;
init_emulate_ctxt(vcpu);
ctxt->op_bytes = 2;
ctxt->ad_bytes = 2;
ctxt->_eip = ctxt->eip + inc_eip;
ret = emulate_int_real(ctxt, irq);
if (ret != X86EMUL_CONTINUE)
return EMULATE_FAIL;
ctxt->eip = ctxt->_eip;
kvm_rip_write(vcpu, ctxt->eip);
kvm_set_rflags(vcpu, ctxt->eflags);
if (irq == NMI_VECTOR)
vcpu->arch.nmi_pending = 0;
else
vcpu->arch.interrupt.pending = false;
return EMULATE_DONE;
}
EXPORT_SYMBOL_GPL(kvm_inject_realmode_interrupt);
static int handle_emulation_failure(struct kvm_vcpu *vcpu)
{
int r = EMULATE_DONE;
++vcpu->stat.insn_emulation_fail;
trace_kvm_emulate_insn_failed(vcpu);
if (!is_guest_mode(vcpu)) {
vcpu->run->exit_reason = KVM_EXIT_INTERNAL_ERROR;
vcpu->run->internal.suberror = KVM_INTERNAL_ERROR_EMULATION;
vcpu->run->internal.ndata = 0;
r = EMULATE_FAIL;
}
kvm_queue_exception(vcpu, UD_VECTOR);
return r;
}
static bool reexecute_instruction(struct kvm_vcpu *vcpu, gva_t cr2,
bool write_fault_to_shadow_pgtable,
int emulation_type)
{
gpa_t gpa = cr2;
pfn_t pfn;
if (emulation_type & EMULTYPE_NO_REEXECUTE)
return false;
if (!vcpu->arch.mmu.direct_map) {
/*
* Write permission should be allowed since only
* write access need to be emulated.
*/
gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
/*
* If the mapping is invalid in guest, let cpu retry
* it to generate fault.
*/
if (gpa == UNMAPPED_GVA)
return true;
}
/*
* Do not retry the unhandleable instruction if it faults on the
* readonly host memory, otherwise it will goto a infinite loop:
* retry instruction -> write #PF -> emulation fail -> retry
* instruction -> ...
*/
pfn = gfn_to_pfn(vcpu->kvm, gpa_to_gfn(gpa));
/*
* If the instruction failed on the error pfn, it can not be fixed,
* report the error to userspace.
*/
if (is_error_noslot_pfn(pfn))
return false;
kvm_release_pfn_clean(pfn);
/* The instructions are well-emulated on direct mmu. */
if (vcpu->arch.mmu.direct_map) {
unsigned int indirect_shadow_pages;
spin_lock(&vcpu->kvm->mmu_lock);
indirect_shadow_pages = vcpu->kvm->arch.indirect_shadow_pages;
spin_unlock(&vcpu->kvm->mmu_lock);
if (indirect_shadow_pages)
kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
return true;
}
/*
* if emulation was due to access to shadowed page table
* and it failed try to unshadow page and re-enter the
* guest to let CPU execute the instruction.
*/
kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
/*
* If the access faults on its page table, it can not
* be fixed by unprotecting shadow page and it should
* be reported to userspace.
*/
return !write_fault_to_shadow_pgtable;
}
static bool retry_instruction(struct x86_emulate_ctxt *ctxt,
unsigned long cr2, int emulation_type)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
unsigned long last_retry_eip, last_retry_addr, gpa = cr2;
last_retry_eip = vcpu->arch.last_retry_eip;
last_retry_addr = vcpu->arch.last_retry_addr;
/*
* If the emulation is caused by #PF and it is non-page_table
* writing instruction, it means the VM-EXIT is caused by shadow
* page protected, we can zap the shadow page and retry this
* instruction directly.
*
* Note: if the guest uses a non-page-table modifying instruction
* on the PDE that points to the instruction, then we will unmap
* the instruction and go to an infinite loop. So, we cache the
* last retried eip and the last fault address, if we meet the eip
* and the address again, we can break out of the potential infinite
* loop.
*/
vcpu->arch.last_retry_eip = vcpu->arch.last_retry_addr = 0;
if (!(emulation_type & EMULTYPE_RETRY))
return false;
if (x86_page_table_writing_insn(ctxt))
return false;
if (ctxt->eip == last_retry_eip && last_retry_addr == cr2)
return false;
vcpu->arch.last_retry_eip = ctxt->eip;
vcpu->arch.last_retry_addr = cr2;
if (!vcpu->arch.mmu.direct_map)
gpa = kvm_mmu_gva_to_gpa_write(vcpu, cr2, NULL);
kvm_mmu_unprotect_page(vcpu->kvm, gpa_to_gfn(gpa));
return true;
}
static int complete_emulated_mmio(struct kvm_vcpu *vcpu);
static int complete_emulated_pio(struct kvm_vcpu *vcpu);
static int kvm_vcpu_check_hw_bp(unsigned long addr, u32 type, u32 dr7,
unsigned long *db)
{
u32 dr6 = 0;
int i;
u32 enable, rwlen;
enable = dr7;
rwlen = dr7 >> 16;
for (i = 0; i < 4; i++, enable >>= 2, rwlen >>= 4)
if ((enable & 3) && (rwlen & 15) == type && db[i] == addr)
dr6 |= (1 << i);
return dr6;
}
static bool kvm_vcpu_check_breakpoint(struct kvm_vcpu *vcpu, int *r)
{
struct kvm_run *kvm_run = vcpu->run;
unsigned long eip = vcpu->arch.emulate_ctxt.eip;
u32 dr6 = 0;
if (unlikely(vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) &&
(vcpu->arch.guest_debug_dr7 & DR7_BP_EN_MASK)) {
dr6 = kvm_vcpu_check_hw_bp(eip, 0,
vcpu->arch.guest_debug_dr7,
vcpu->arch.eff_db);
if (dr6 != 0) {
kvm_run->debug.arch.dr6 = dr6 | DR6_FIXED_1;
kvm_run->debug.arch.pc = kvm_rip_read(vcpu) +
get_segment_base(vcpu, VCPU_SREG_CS);
kvm_run->debug.arch.exception = DB_VECTOR;
kvm_run->exit_reason = KVM_EXIT_DEBUG;
*r = EMULATE_USER_EXIT;
return true;
}
}
if (unlikely(vcpu->arch.dr7 & DR7_BP_EN_MASK)) {
dr6 = kvm_vcpu_check_hw_bp(eip, 0,
vcpu->arch.dr7,
vcpu->arch.db);
if (dr6 != 0) {
vcpu->arch.dr6 &= ~15;
vcpu->arch.dr6 |= dr6;
kvm_queue_exception(vcpu, DB_VECTOR);
*r = EMULATE_DONE;
return true;
}
}
return false;
}
int x86_emulate_instruction(struct kvm_vcpu *vcpu,
unsigned long cr2,
int emulation_type,
void *insn,
int insn_len)
{
int r;
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
bool writeback = true;
bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable;
/*
* Clear write_fault_to_shadow_pgtable here to ensure it is
* never reused.
*/
vcpu->arch.write_fault_to_shadow_pgtable = false;
kvm_clear_exception_queue(vcpu);
if (!(emulation_type & EMULTYPE_NO_DECODE)) {
init_emulate_ctxt(vcpu);
/*
* We will reenter on the same instruction since
* we do not set complete_userspace_io. This does not
* handle watchpoints yet, those would be handled in
* the emulate_ops.
*/
if (kvm_vcpu_check_breakpoint(vcpu, &r))
return r;
ctxt->interruptibility = 0;
ctxt->have_exception = false;
ctxt->perm_ok = false;
ctxt->only_vendor_specific_insn
= emulation_type & EMULTYPE_TRAP_UD;
r = x86_decode_insn(ctxt, insn, insn_len);
trace_kvm_emulate_insn_start(vcpu);
++vcpu->stat.insn_emulation;
if (r != EMULATION_OK) {
if (emulation_type & EMULTYPE_TRAP_UD)
return EMULATE_FAIL;
if (reexecute_instruction(vcpu, cr2, write_fault_to_spt,
emulation_type))
return EMULATE_DONE;
if (emulation_type & EMULTYPE_SKIP)
return EMULATE_FAIL;
return handle_emulation_failure(vcpu);
}
}
if (emulation_type & EMULTYPE_SKIP) {
kvm_rip_write(vcpu, ctxt->_eip);
return EMULATE_DONE;
}
if (retry_instruction(ctxt, cr2, emulation_type))
return EMULATE_DONE;
/* this is needed for vmware backdoor interface to work since it
changes registers values during IO operation */
if (vcpu->arch.emulate_regs_need_sync_from_vcpu) {
vcpu->arch.emulate_regs_need_sync_from_vcpu = false;
emulator_invalidate_register_cache(ctxt);
}
restart:
r = x86_emulate_insn(ctxt);
if (r == EMULATION_INTERCEPTED)
return EMULATE_DONE;
if (r == EMULATION_FAILED) {
if (reexecute_instruction(vcpu, cr2, write_fault_to_spt,
emulation_type))
return EMULATE_DONE;
return handle_emulation_failure(vcpu);
}
if (ctxt->have_exception) {
inject_emulated_exception(vcpu);
r = EMULATE_DONE;
} else if (vcpu->arch.pio.count) {
if (!vcpu->arch.pio.in)
vcpu->arch.pio.count = 0;
else {
writeback = false;
vcpu->arch.complete_userspace_io = complete_emulated_pio;
}
r = EMULATE_USER_EXIT;
} else if (vcpu->mmio_needed) {
if (!vcpu->mmio_is_write)
writeback = false;
r = EMULATE_USER_EXIT;
vcpu->arch.complete_userspace_io = complete_emulated_mmio;
} else if (r == EMULATION_RESTART)
goto restart;
else
r = EMULATE_DONE;
if (writeback) {
toggle_interruptibility(vcpu, ctxt->interruptibility);
kvm_set_rflags(vcpu, ctxt->eflags);
kvm_make_request(KVM_REQ_EVENT, vcpu);
vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
kvm_rip_write(vcpu, ctxt->eip);
} else
vcpu->arch.emulate_regs_need_sync_to_vcpu = true;
return r;
}
EXPORT_SYMBOL_GPL(x86_emulate_instruction);
int kvm_fast_pio_out(struct kvm_vcpu *vcpu, int size, unsigned short port)
{
unsigned long val = kvm_register_read(vcpu, VCPU_REGS_RAX);
int ret = emulator_pio_out_emulated(&vcpu->arch.emulate_ctxt,
size, port, &val, 1);
/* do not return to emulator after return from userspace */
vcpu->arch.pio.count = 0;
return ret;
}
EXPORT_SYMBOL_GPL(kvm_fast_pio_out);
static void tsc_bad(void *info)
{
__this_cpu_write(cpu_tsc_khz, 0);
}
static void tsc_khz_changed(void *data)
{
struct cpufreq_freqs *freq = data;
unsigned long khz = 0;
if (data)
khz = freq->new;
else if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
khz = cpufreq_quick_get(raw_smp_processor_id());
if (!khz)
khz = tsc_khz;
__this_cpu_write(cpu_tsc_khz, khz);
}
static int kvmclock_cpufreq_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
struct cpufreq_freqs *freq = data;
struct kvm *kvm;
struct kvm_vcpu *vcpu;
int i, send_ipi = 0;
/*
* We allow guests to temporarily run on slowing clocks,
* provided we notify them after, or to run on accelerating
* clocks, provided we notify them before. Thus time never
* goes backwards.
*
* However, we have a problem. We can't atomically update
* the frequency of a given CPU from this function; it is
* merely a notifier, which can be called from any CPU.
* Changing the TSC frequency at arbitrary points in time
* requires a recomputation of local variables related to
* the TSC for each VCPU. We must flag these local variables
* to be updated and be sure the update takes place with the
* new frequency before any guests proceed.
*
* Unfortunately, the combination of hotplug CPU and frequency
* change creates an intractable locking scenario; the order
* of when these callouts happen is undefined with respect to
* CPU hotplug, and they can race with each other. As such,
* merely setting per_cpu(cpu_tsc_khz) = X during a hotadd is
* undefined; you can actually have a CPU frequency change take
* place in between the computation of X and the setting of the
* variable. To protect against this problem, all updates of
* the per_cpu tsc_khz variable are done in an interrupt
* protected IPI, and all callers wishing to update the value
* must wait for a synchronous IPI to complete (which is trivial
* if the caller is on the CPU already). This establishes the
* necessary total order on variable updates.
*
* Note that because a guest time update may take place
* anytime after the setting of the VCPU's request bit, the
* correct TSC value must be set before the request. However,
* to ensure the update actually makes it to any guest which
* starts running in hardware virtualization between the set
* and the acquisition of the spinlock, we must also ping the
* CPU after setting the request bit.
*
*/
if (val == CPUFREQ_PRECHANGE && freq->old > freq->new)
return 0;
if (val == CPUFREQ_POSTCHANGE && freq->old < freq->new)
return 0;
smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
raw_spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list) {
kvm_for_each_vcpu(i, vcpu, kvm) {
if (vcpu->cpu != freq->cpu)
continue;
kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
if (vcpu->cpu != smp_processor_id())
send_ipi = 1;
}
}
raw_spin_unlock(&kvm_lock);
if (freq->old < freq->new && send_ipi) {
/*
* We upscale the frequency. Must make the guest
* doesn't see old kvmclock values while running with
* the new frequency, otherwise we risk the guest sees
* time go backwards.
*
* In case we update the frequency for another cpu
* (which might be in guest context) send an interrupt
* to kick the cpu out of guest context. Next time
* guest context is entered kvmclock will be updated,
* so the guest will not see stale values.
*/
smp_call_function_single(freq->cpu, tsc_khz_changed, freq, 1);
}
return 0;
}
static struct notifier_block kvmclock_cpufreq_notifier_block = {
.notifier_call = kvmclock_cpufreq_notifier
};
static int kvmclock_cpu_notifier(struct notifier_block *nfb,
unsigned long action, void *hcpu)
{
unsigned int cpu = (unsigned long)hcpu;
switch (action) {
case CPU_ONLINE:
case CPU_DOWN_FAILED:
smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
break;
case CPU_DOWN_PREPARE:
smp_call_function_single(cpu, tsc_bad, NULL, 1);
break;
}
return NOTIFY_OK;
}
static struct notifier_block kvmclock_cpu_notifier_block = {
.notifier_call = kvmclock_cpu_notifier,
.priority = -INT_MAX
};
static void kvm_timer_init(void)
{
int cpu;
max_tsc_khz = tsc_khz;
register_hotcpu_notifier(&kvmclock_cpu_notifier_block);
if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC)) {
#ifdef CONFIG_CPU_FREQ
struct cpufreq_policy policy;
memset(&policy, 0, sizeof(policy));
cpu = get_cpu();
cpufreq_get_policy(&policy, cpu);
if (policy.cpuinfo.max_freq)
max_tsc_khz = policy.cpuinfo.max_freq;
put_cpu();
#endif
cpufreq_register_notifier(&kvmclock_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
}
pr_debug("kvm: max_tsc_khz = %ld\n", max_tsc_khz);
for_each_online_cpu(cpu)
smp_call_function_single(cpu, tsc_khz_changed, NULL, 1);
}
static DEFINE_PER_CPU(struct kvm_vcpu *, current_vcpu);
int kvm_is_in_guest(void)
{
return __this_cpu_read(current_vcpu) != NULL;
}
static int kvm_is_user_mode(void)
{
int user_mode = 3;
if (__this_cpu_read(current_vcpu))
user_mode = kvm_x86_ops->get_cpl(__this_cpu_read(current_vcpu));
return user_mode != 0;
}
static unsigned long kvm_get_guest_ip(void)
{
unsigned long ip = 0;
if (__this_cpu_read(current_vcpu))
ip = kvm_rip_read(__this_cpu_read(current_vcpu));
return ip;
}
static struct perf_guest_info_callbacks kvm_guest_cbs = {
.is_in_guest = kvm_is_in_guest,
.is_user_mode = kvm_is_user_mode,
.get_guest_ip = kvm_get_guest_ip,
};
void kvm_before_handle_nmi(struct kvm_vcpu *vcpu)
{
__this_cpu_write(current_vcpu, vcpu);
}
EXPORT_SYMBOL_GPL(kvm_before_handle_nmi);
void kvm_after_handle_nmi(struct kvm_vcpu *vcpu)
{
__this_cpu_write(current_vcpu, NULL);
}
EXPORT_SYMBOL_GPL(kvm_after_handle_nmi);
static void kvm_set_mmio_spte_mask(void)
{
u64 mask;
int maxphyaddr = boot_cpu_data.x86_phys_bits;
/*
* Set the reserved bits and the present bit of an paging-structure
* entry to generate page fault with PFER.RSV = 1.
*/
/* Mask the reserved physical address bits. */
mask = ((1ull << (51 - maxphyaddr + 1)) - 1) << maxphyaddr;
/* Bit 62 is always reserved for 32bit host. */
mask |= 0x3ull << 62;
/* Set the present bit. */
mask |= 1ull;
#ifdef CONFIG_X86_64
/*
* If reserved bit is not supported, clear the present bit to disable
* mmio page fault.
*/
if (maxphyaddr == 52)
mask &= ~1ull;
#endif
kvm_mmu_set_mmio_spte_mask(mask);
}
#ifdef CONFIG_X86_64
static void pvclock_gtod_update_fn(struct work_struct *work)
{
struct kvm *kvm;
struct kvm_vcpu *vcpu;
int i;
raw_spin_lock(&kvm_lock);
list_for_each_entry(kvm, &vm_list, vm_list)
kvm_for_each_vcpu(i, vcpu, kvm)
set_bit(KVM_REQ_MASTERCLOCK_UPDATE, &vcpu->requests);
atomic_set(&kvm_guest_has_master_clock, 0);
raw_spin_unlock(&kvm_lock);
}
static DECLARE_WORK(pvclock_gtod_work, pvclock_gtod_update_fn);
/*
* Notification about pvclock gtod data update.
*/
static int pvclock_gtod_notify(struct notifier_block *nb, unsigned long unused,
void *priv)
{
struct pvclock_gtod_data *gtod = &pvclock_gtod_data;
struct timekeeper *tk = priv;
update_pvclock_gtod(tk);
/* disable master clock if host does not trust, or does not
* use, TSC clocksource
*/
if (gtod->clock.vclock_mode != VCLOCK_TSC &&
atomic_read(&kvm_guest_has_master_clock) != 0)
queue_work(system_long_wq, &pvclock_gtod_work);
return 0;
}
static struct notifier_block pvclock_gtod_notifier = {
.notifier_call = pvclock_gtod_notify,
};
#endif
int kvm_arch_init(void *opaque)
{
int r;
struct kvm_x86_ops *ops = opaque;
if (kvm_x86_ops) {
printk(KERN_ERR "kvm: already loaded the other module\n");
r = -EEXIST;
goto out;
}
if (!ops->cpu_has_kvm_support()) {
printk(KERN_ERR "kvm: no hardware support\n");
r = -EOPNOTSUPP;
goto out;
}
if (ops->disabled_by_bios()) {
printk(KERN_ERR "kvm: disabled by bios\n");
r = -EOPNOTSUPP;
goto out;
}
r = -ENOMEM;
shared_msrs = alloc_percpu(struct kvm_shared_msrs);
if (!shared_msrs) {
printk(KERN_ERR "kvm: failed to allocate percpu kvm_shared_msrs\n");
goto out;
}
r = kvm_mmu_module_init();
if (r)
goto out_free_percpu;
kvm_set_mmio_spte_mask();
kvm_init_msr_list();
kvm_x86_ops = ops;
kvm_mmu_set_mask_ptes(PT_USER_MASK, PT_ACCESSED_MASK,
PT_DIRTY_MASK, PT64_NX_MASK, 0);
kvm_timer_init();
perf_register_guest_info_callbacks(&kvm_guest_cbs);
if (cpu_has_xsave)
host_xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
kvm_lapic_init();
#ifdef CONFIG_X86_64
pvclock_gtod_register_notifier(&pvclock_gtod_notifier);
#endif
return 0;
out_free_percpu:
free_percpu(shared_msrs);
out:
return r;
}
void kvm_arch_exit(void)
{
perf_unregister_guest_info_callbacks(&kvm_guest_cbs);
if (!boot_cpu_has(X86_FEATURE_CONSTANT_TSC))
cpufreq_unregister_notifier(&kvmclock_cpufreq_notifier_block,
CPUFREQ_TRANSITION_NOTIFIER);
unregister_hotcpu_notifier(&kvmclock_cpu_notifier_block);
#ifdef CONFIG_X86_64
pvclock_gtod_unregister_notifier(&pvclock_gtod_notifier);
#endif
kvm_x86_ops = NULL;
kvm_mmu_module_exit();
free_percpu(shared_msrs);
}
int kvm_emulate_halt(struct kvm_vcpu *vcpu)
{
++vcpu->stat.halt_exits;
if (irqchip_in_kernel(vcpu->kvm)) {
vcpu->arch.mp_state = KVM_MP_STATE_HALTED;
return 1;
} else {
vcpu->run->exit_reason = KVM_EXIT_HLT;
return 0;
}
}
EXPORT_SYMBOL_GPL(kvm_emulate_halt);
int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
{
u64 param, ingpa, outgpa, ret;
uint16_t code, rep_idx, rep_cnt, res = HV_STATUS_SUCCESS, rep_done = 0;
bool fast, longmode;
int cs_db, cs_l;
/*
* hypercall generates UD from non zero cpl and real mode
* per HYPER-V spec
*/
if (kvm_x86_ops->get_cpl(vcpu) != 0 || !is_protmode(vcpu)) {
kvm_queue_exception(vcpu, UD_VECTOR);
return 0;
}
kvm_x86_ops->get_cs_db_l_bits(vcpu, &cs_db, &cs_l);
longmode = is_long_mode(vcpu) && cs_l == 1;
if (!longmode) {
param = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDX) << 32) |
(kvm_register_read(vcpu, VCPU_REGS_RAX) & 0xffffffff);
ingpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RBX) << 32) |
(kvm_register_read(vcpu, VCPU_REGS_RCX) & 0xffffffff);
outgpa = ((u64)kvm_register_read(vcpu, VCPU_REGS_RDI) << 32) |
(kvm_register_read(vcpu, VCPU_REGS_RSI) & 0xffffffff);
}
#ifdef CONFIG_X86_64
else {
param = kvm_register_read(vcpu, VCPU_REGS_RCX);
ingpa = kvm_register_read(vcpu, VCPU_REGS_RDX);
outgpa = kvm_register_read(vcpu, VCPU_REGS_R8);
}
#endif
code = param & 0xffff;
fast = (param >> 16) & 0x1;
rep_cnt = (param >> 32) & 0xfff;
rep_idx = (param >> 48) & 0xfff;
trace_kvm_hv_hypercall(code, fast, rep_cnt, rep_idx, ingpa, outgpa);
switch (code) {
case HV_X64_HV_NOTIFY_LONG_SPIN_WAIT:
kvm_vcpu_on_spin(vcpu);
break;
default:
res = HV_STATUS_INVALID_HYPERCALL_CODE;
break;
}
ret = res | (((u64)rep_done & 0xfff) << 32);
if (longmode) {
kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
} else {
kvm_register_write(vcpu, VCPU_REGS_RDX, ret >> 32);
kvm_register_write(vcpu, VCPU_REGS_RAX, ret & 0xffffffff);
}
return 1;
}
int kvm_emulate_hypercall(struct kvm_vcpu *vcpu)
{
unsigned long nr, a0, a1, a2, a3, ret;
int r = 1;
if (kvm_hv_hypercall_enabled(vcpu->kvm))
return kvm_hv_hypercall(vcpu);
nr = kvm_register_read(vcpu, VCPU_REGS_RAX);
a0 = kvm_register_read(vcpu, VCPU_REGS_RBX);
a1 = kvm_register_read(vcpu, VCPU_REGS_RCX);
a2 = kvm_register_read(vcpu, VCPU_REGS_RDX);
a3 = kvm_register_read(vcpu, VCPU_REGS_RSI);
trace_kvm_hypercall(nr, a0, a1, a2, a3);
if (!is_long_mode(vcpu)) {
nr &= 0xFFFFFFFF;
a0 &= 0xFFFFFFFF;
a1 &= 0xFFFFFFFF;
a2 &= 0xFFFFFFFF;
a3 &= 0xFFFFFFFF;
}
if (kvm_x86_ops->get_cpl(vcpu) != 0) {
ret = -KVM_EPERM;
goto out;
}
switch (nr) {
case KVM_HC_VAPIC_POLL_IRQ:
ret = 0;
break;
default:
ret = -KVM_ENOSYS;
break;
}
out:
kvm_register_write(vcpu, VCPU_REGS_RAX, ret);
++vcpu->stat.hypercalls;
return r;
}
EXPORT_SYMBOL_GPL(kvm_emulate_hypercall);
static int emulator_fix_hypercall(struct x86_emulate_ctxt *ctxt)
{
struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
char instruction[3];
unsigned long rip = kvm_rip_read(vcpu);
kvm_x86_ops->patch_hypercall(vcpu, instruction);
return emulator_write_emulated(ctxt, rip, instruction, 3, NULL);
}
/*
* Check if userspace requested an interrupt window, and that the
* interrupt window is open.
*
* No need to exit to userspace if we already have an interrupt queued.
*/
static int dm_request_for_irq_injection(struct kvm_vcpu *vcpu)
{
return (!irqchip_in_kernel(vcpu->kvm) && !kvm_cpu_has_interrupt(vcpu) &&
vcpu->run->request_interrupt_window &&
kvm_arch_interrupt_allowed(vcpu));
}
static void post_kvm_run_save(struct kvm_vcpu *vcpu)
{
struct kvm_run *kvm_run = vcpu->run;
kvm_run->if_flag = (kvm_get_rflags(vcpu) & X86_EFLAGS_IF) != 0;
kvm_run->cr8 = kvm_get_cr8(vcpu);
kvm_run->apic_base = kvm_get_apic_base(vcpu);
if (irqchip_in_kernel(vcpu->kvm))
kvm_run->ready_for_interrupt_injection = 1;
else
kvm_run->ready_for_interrupt_injection =
kvm_arch_interrupt_allowed(vcpu) &&
!kvm_cpu_has_interrupt(vcpu) &&
!kvm_event_needs_reinjection(vcpu);
}
static int vapic_enter(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
struct page *page;
if (!apic || !apic->vapic_addr)
return 0;
page = gfn_to_page(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
if (is_error_page(page))
return -EFAULT;
vcpu->arch.apic->vapic_page = page;
return 0;
}
static void vapic_exit(struct kvm_vcpu *vcpu)
{
struct kvm_lapic *apic = vcpu->arch.apic;
int idx;
if (!apic || !apic->vapic_addr)
return;
idx = srcu_read_lock(&vcpu->kvm->srcu);
kvm_release_page_dirty(apic->vapic_page);
mark_page_dirty(vcpu->kvm, apic->vapic_addr >> PAGE_SHIFT);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
}
static void update_cr8_intercept(struct kvm_vcpu *vcpu)
{
int max_irr, tpr;
if (!kvm_x86_ops->update_cr8_intercept)
return;
if (!vcpu->arch.apic)
return;
if (!vcpu->arch.apic->vapic_addr)
max_irr = kvm_lapic_find_highest_irr(vcpu);
else
max_irr = -1;
if (max_irr != -1)
max_irr >>= 4;
tpr = kvm_lapic_get_cr8(vcpu);
kvm_x86_ops->update_cr8_intercept(vcpu, tpr, max_irr);
}
static void inject_pending_event(struct kvm_vcpu *vcpu)
{
/* try to reinject previous events if any */
if (vcpu->arch.exception.pending) {
trace_kvm_inj_exception(vcpu->arch.exception.nr,
vcpu->arch.exception.has_error_code,
vcpu->arch.exception.error_code);
kvm_x86_ops->queue_exception(vcpu, vcpu->arch.exception.nr,
vcpu->arch.exception.has_error_code,
vcpu->arch.exception.error_code,
vcpu->arch.exception.reinject);
return;
}
if (vcpu->arch.nmi_injected) {
kvm_x86_ops->set_nmi(vcpu);
return;
}
if (vcpu->arch.interrupt.pending) {
kvm_x86_ops->set_irq(vcpu);
return;
}
/* try to inject new event if pending */
if (vcpu->arch.nmi_pending) {
if (kvm_x86_ops->nmi_allowed(vcpu)) {
--vcpu->arch.nmi_pending;
vcpu->arch.nmi_injected = true;
kvm_x86_ops->set_nmi(vcpu);
}
} else if (kvm_cpu_has_injectable_intr(vcpu)) {
if (kvm_x86_ops->interrupt_allowed(vcpu)) {
kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu),
false);
kvm_x86_ops->set_irq(vcpu);
}
}
}
static void process_nmi(struct kvm_vcpu *vcpu)
{
unsigned limit = 2;
/*
* x86 is limited to one NMI running, and one NMI pending after it.
* If an NMI is already in progress, limit further NMIs to just one.
* Otherwise, allow two (and we'll inject the first one immediately).
*/
if (kvm_x86_ops->get_nmi_mask(vcpu) || vcpu->arch.nmi_injected)
limit = 1;
vcpu->arch.nmi_pending += atomic_xchg(&vcpu->arch.nmi_queued, 0);
vcpu->arch.nmi_pending = min(vcpu->arch.nmi_pending, limit);
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
static void kvm_gen_update_masterclock(struct kvm *kvm)
{
#ifdef CONFIG_X86_64
int i;
struct kvm_vcpu *vcpu;
struct kvm_arch *ka = &kvm->arch;
spin_lock(&ka->pvclock_gtod_sync_lock);
kvm_make_mclock_inprogress_request(kvm);
/* no guest entries from this point */
pvclock_update_vm_gtod_copy(kvm);
kvm_for_each_vcpu(i, vcpu, kvm)
set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
/* guest entries allowed */
kvm_for_each_vcpu(i, vcpu, kvm)
clear_bit(KVM_REQ_MCLOCK_INPROGRESS, &vcpu->requests);
spin_unlock(&ka->pvclock_gtod_sync_lock);
#endif
}
static void vcpu_scan_ioapic(struct kvm_vcpu *vcpu)
{
u64 eoi_exit_bitmap[4];
u32 tmr[8];
if (!kvm_apic_hw_enabled(vcpu->arch.apic))
return;
memset(eoi_exit_bitmap, 0, 32);
memset(tmr, 0, 32);
kvm_ioapic_scan_entry(vcpu, eoi_exit_bitmap, tmr);
kvm_x86_ops->load_eoi_exitmap(vcpu, eoi_exit_bitmap);
kvm_apic_update_tmr(vcpu, tmr);
}
static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
{
int r;
bool req_int_win = !irqchip_in_kernel(vcpu->kvm) &&
vcpu->run->request_interrupt_window;
bool req_immediate_exit = false;
if (vcpu->requests) {
if (kvm_check_request(KVM_REQ_MMU_RELOAD, vcpu))
kvm_mmu_unload(vcpu);
if (kvm_check_request(KVM_REQ_MIGRATE_TIMER, vcpu))
__kvm_migrate_timers(vcpu);
if (kvm_check_request(KVM_REQ_MASTERCLOCK_UPDATE, vcpu))
kvm_gen_update_masterclock(vcpu->kvm);
if (kvm_check_request(KVM_REQ_GLOBAL_CLOCK_UPDATE, vcpu))
kvm_gen_kvmclock_update(vcpu);
if (kvm_check_request(KVM_REQ_CLOCK_UPDATE, vcpu)) {
r = kvm_guest_time_update(vcpu);
if (unlikely(r))
goto out;
}
if (kvm_check_request(KVM_REQ_MMU_SYNC, vcpu))
kvm_mmu_sync_roots(vcpu);
if (kvm_check_request(KVM_REQ_TLB_FLUSH, vcpu))
kvm_x86_ops->tlb_flush(vcpu);
if (kvm_check_request(KVM_REQ_REPORT_TPR_ACCESS, vcpu)) {
vcpu->run->exit_reason = KVM_EXIT_TPR_ACCESS;
r = 0;
goto out;
}
if (kvm_check_request(KVM_REQ_TRIPLE_FAULT, vcpu)) {
vcpu->run->exit_reason = KVM_EXIT_SHUTDOWN;
r = 0;
goto out;
}
if (kvm_check_request(KVM_REQ_DEACTIVATE_FPU, vcpu)) {
vcpu->fpu_active = 0;
kvm_x86_ops->fpu_deactivate(vcpu);
}
if (kvm_check_request(KVM_REQ_APF_HALT, vcpu)) {
/* Page is swapped out. Do synthetic halt */
vcpu->arch.apf.halted = true;
r = 1;
goto out;
}
if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
record_steal_time(vcpu);
if (kvm_check_request(KVM_REQ_NMI, vcpu))
process_nmi(vcpu);
if (kvm_check_request(KVM_REQ_PMU, vcpu))
kvm_handle_pmu_event(vcpu);
if (kvm_check_request(KVM_REQ_PMI, vcpu))
kvm_deliver_pmi(vcpu);
if (kvm_check_request(KVM_REQ_SCAN_IOAPIC, vcpu))
vcpu_scan_ioapic(vcpu);
}
if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
kvm_apic_accept_events(vcpu);
if (vcpu->arch.mp_state == KVM_MP_STATE_INIT_RECEIVED) {
r = 1;
goto out;
}
inject_pending_event(vcpu);
/* enable NMI/IRQ window open exits if needed */
if (vcpu->arch.nmi_pending)
req_immediate_exit =
kvm_x86_ops->enable_nmi_window(vcpu) != 0;
else if (kvm_cpu_has_injectable_intr(vcpu) || req_int_win)
req_immediate_exit =
kvm_x86_ops->enable_irq_window(vcpu) != 0;
if (kvm_lapic_enabled(vcpu)) {
/*
* Update architecture specific hints for APIC
* virtual interrupt delivery.
*/
if (kvm_x86_ops->hwapic_irr_update)
kvm_x86_ops->hwapic_irr_update(vcpu,
kvm_lapic_find_highest_irr(vcpu));
update_cr8_intercept(vcpu);
kvm_lapic_sync_to_vapic(vcpu);
}
}
r = kvm_mmu_reload(vcpu);
if (unlikely(r)) {
goto cancel_injection;
}
preempt_disable();
kvm_x86_ops->prepare_guest_switch(vcpu);
if (vcpu->fpu_active)
kvm_load_guest_fpu(vcpu);
kvm_load_guest_xcr0(vcpu);
vcpu->mode = IN_GUEST_MODE;
/* We should set ->mode before check ->requests,
* see the comment in make_all_cpus_request.
*/
smp_mb();
local_irq_disable();
if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
|| need_resched() || signal_pending(current)) {
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
local_irq_enable();
preempt_enable();
r = 1;
goto cancel_injection;
}
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
if (req_immediate_exit)
smp_send_reschedule(vcpu->cpu);
kvm_guest_enter();
if (unlikely(vcpu->arch.switch_db_regs)) {
set_debugreg(0, 7);
set_debugreg(vcpu->arch.eff_db[0], 0);
set_debugreg(vcpu->arch.eff_db[1], 1);
set_debugreg(vcpu->arch.eff_db[2], 2);
set_debugreg(vcpu->arch.eff_db[3], 3);
}
trace_kvm_entry(vcpu->vcpu_id);
kvm_x86_ops->run(vcpu);
/*
* If the guest has used debug registers, at least dr7
* will be disabled while returning to the host.
* If we don't have active breakpoints in the host, we don't
* care about the messed up debug address registers. But if
* we have some of them active, restore the old state.
*/
if (hw_breakpoint_active())
hw_breakpoint_restore();
vcpu->arch.last_guest_tsc = kvm_x86_ops->read_l1_tsc(vcpu,
native_read_tsc());
vcpu->mode = OUTSIDE_GUEST_MODE;
smp_wmb();
/* Interrupt is enabled by handle_external_intr() */
kvm_x86_ops->handle_external_intr(vcpu);
++vcpu->stat.exits;
/*
* We must have an instruction between local_irq_enable() and
* kvm_guest_exit(), so the timer interrupt isn't delayed by
* the interrupt shadow. The stat.exits increment will do nicely.
* But we need to prevent reordering, hence this barrier():
*/
barrier();
kvm_guest_exit();
preempt_enable();
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
/*
* Profile KVM exit RIPs:
*/
if (unlikely(prof_on == KVM_PROFILING)) {
unsigned long rip = kvm_rip_read(vcpu);
profile_hit(KVM_PROFILING, (void *)rip);
}
if (unlikely(vcpu->arch.tsc_always_catchup))
kvm_make_request(KVM_REQ_CLOCK_UPDATE, vcpu);
if (vcpu->arch.apic_attention)
kvm_lapic_sync_from_vapic(vcpu);
r = kvm_x86_ops->handle_exit(vcpu);
return r;
cancel_injection:
kvm_x86_ops->cancel_injection(vcpu);
if (unlikely(vcpu->arch.apic_attention))
kvm_lapic_sync_from_vapic(vcpu);
out:
return r;
}
static int __vcpu_run(struct kvm_vcpu *vcpu)
{
int r;
struct kvm *kvm = vcpu->kvm;
vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
r = vapic_enter(vcpu);
if (r) {
srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
return r;
}
r = 1;
while (r > 0) {
if (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted)
r = vcpu_enter_guest(vcpu);
else {
srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
kvm_vcpu_block(vcpu);
vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
if (kvm_check_request(KVM_REQ_UNHALT, vcpu)) {
kvm_apic_accept_events(vcpu);
switch(vcpu->arch.mp_state) {
case KVM_MP_STATE_HALTED:
vcpu->arch.mp_state =
KVM_MP_STATE_RUNNABLE;
case KVM_MP_STATE_RUNNABLE:
vcpu->arch.apf.halted = false;
break;
case KVM_MP_STATE_INIT_RECEIVED:
break;
default:
r = -EINTR;
break;
}
}
}
if (r <= 0)
break;
clear_bit(KVM_REQ_PENDING_TIMER, &vcpu->requests);
if (kvm_cpu_has_pending_timer(vcpu))
kvm_inject_pending_timer_irqs(vcpu);
if (dm_request_for_irq_injection(vcpu)) {
r = -EINTR;
vcpu->run->exit_reason = KVM_EXIT_INTR;
++vcpu->stat.request_irq_exits;
}
kvm_check_async_pf_completion(vcpu);
if (signal_pending(current)) {
r = -EINTR;
vcpu->run->exit_reason = KVM_EXIT_INTR;
++vcpu->stat.signal_exits;
}
if (need_resched()) {
srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
kvm_resched(vcpu);
vcpu->srcu_idx = srcu_read_lock(&kvm->srcu);
}
}
srcu_read_unlock(&kvm->srcu, vcpu->srcu_idx);
vapic_exit(vcpu);
return r;
}
static inline int complete_emulated_io(struct kvm_vcpu *vcpu)
{
int r;
vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);
r = emulate_instruction(vcpu, EMULTYPE_NO_DECODE);
srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);
if (r != EMULATE_DONE)
return 0;
return 1;
}
static int complete_emulated_pio(struct kvm_vcpu *vcpu)
{
BUG_ON(!vcpu->arch.pio.count);
return complete_emulated_io(vcpu);
}
/*
* Implements the following, as a state machine:
*
* read:
* for each fragment
* for each mmio piece in the fragment
* write gpa, len
* exit
* copy data
* execute insn
*
* write:
* for each fragment
* for each mmio piece in the fragment
* write gpa, len
* copy data
* exit
*/
static int complete_emulated_mmio(struct kvm_vcpu *vcpu)
{
struct kvm_run *run = vcpu->run;
struct kvm_mmio_fragment *frag;
unsigned len;
BUG_ON(!vcpu->mmio_needed);
/* Complete previous fragment */
frag = &vcpu->mmio_fragments[vcpu->mmio_cur_fragment];
len = min(8u, frag->len);
if (!vcpu->mmio_is_write)
memcpy(frag->data, run->mmio.data, len);
if (frag->len <= 8) {
/* Switch to the next fragment. */
frag++;
vcpu->mmio_cur_fragment++;
} else {
/* Go forward to the next mmio piece. */
frag->data += len;
frag->gpa += len;
frag->len -= len;
}
if (vcpu->mmio_cur_fragment == vcpu->mmio_nr_fragments) {
vcpu->mmio_needed = 0;
if (vcpu->mmio_is_write)
return 1;
vcpu->mmio_read_completed = 1;
return complete_emulated_io(vcpu);
}
run->exit_reason = KVM_EXIT_MMIO;
run->mmio.phys_addr = frag->gpa;
if (vcpu->mmio_is_write)
memcpy(run->mmio.data, frag->data, min(8u, frag->len));
run->mmio.len = min(8u, frag->len);
run->mmio.is_write = vcpu->mmio_is_write;
vcpu->arch.complete_userspace_io = complete_emulated_mmio;
return 0;
}
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
int r;
sigset_t sigsaved;
if (!tsk_used_math(current) && init_fpu(current))
return -ENOMEM;
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
if (unlikely(vcpu->arch.mp_state == KVM_MP_STATE_UNINITIALIZED)) {
kvm_vcpu_block(vcpu);
kvm_apic_accept_events(vcpu);
clear_bit(KVM_REQ_UNHALT, &vcpu->requests);
r = -EAGAIN;
goto out;
}
/* re-sync apic's tpr */
if (!irqchip_in_kernel(vcpu->kvm)) {
if (kvm_set_cr8(vcpu, kvm_run->cr8) != 0) {
r = -EINVAL;
goto out;
}
}
if (unlikely(vcpu->arch.complete_userspace_io)) {
int (*cui)(struct kvm_vcpu *) = vcpu->arch.complete_userspace_io;
vcpu->arch.complete_userspace_io = NULL;
r = cui(vcpu);
if (r <= 0)
goto out;
} else
WARN_ON(vcpu->arch.pio.count || vcpu->mmio_needed);
r = __vcpu_run(vcpu);
out:
post_kvm_run_save(vcpu);
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
return r;
}
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
if (vcpu->arch.emulate_regs_need_sync_to_vcpu) {
/*
* We are here if userspace calls get_regs() in the middle of
* instruction emulation. Registers state needs to be copied
* back from emulation context to vcpu. Userspace shouldn't do
* that usually, but some bad designed PV devices (vmware
* backdoor interface) need this to work
*/
emulator_writeback_register_cache(&vcpu->arch.emulate_ctxt);
vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
}
regs->rax = kvm_register_read(vcpu, VCPU_REGS_RAX);
regs->rbx = kvm_register_read(vcpu, VCPU_REGS_RBX);
regs->rcx = kvm_register_read(vcpu, VCPU_REGS_RCX);
regs->rdx = kvm_register_read(vcpu, VCPU_REGS_RDX);
regs->rsi = kvm_register_read(vcpu, VCPU_REGS_RSI);
regs->rdi = kvm_register_read(vcpu, VCPU_REGS_RDI);
regs->rsp = kvm_register_read(vcpu, VCPU_REGS_RSP);
regs->rbp = kvm_register_read(vcpu, VCPU_REGS_RBP);
#ifdef CONFIG_X86_64
regs->r8 = kvm_register_read(vcpu, VCPU_REGS_R8);
regs->r9 = kvm_register_read(vcpu, VCPU_REGS_R9);
regs->r10 = kvm_register_read(vcpu, VCPU_REGS_R10);
regs->r11 = kvm_register_read(vcpu, VCPU_REGS_R11);
regs->r12 = kvm_register_read(vcpu, VCPU_REGS_R12);
regs->r13 = kvm_register_read(vcpu, VCPU_REGS_R13);
regs->r14 = kvm_register_read(vcpu, VCPU_REGS_R14);
regs->r15 = kvm_register_read(vcpu, VCPU_REGS_R15);
#endif
regs->rip = kvm_rip_read(vcpu);
regs->rflags = kvm_get_rflags(vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
vcpu->arch.emulate_regs_need_sync_from_vcpu = true;
vcpu->arch.emulate_regs_need_sync_to_vcpu = false;
kvm_register_write(vcpu, VCPU_REGS_RAX, regs->rax);
kvm_register_write(vcpu, VCPU_REGS_RBX, regs->rbx);
kvm_register_write(vcpu, VCPU_REGS_RCX, regs->rcx);
kvm_register_write(vcpu, VCPU_REGS_RDX, regs->rdx);
kvm_register_write(vcpu, VCPU_REGS_RSI, regs->rsi);
kvm_register_write(vcpu, VCPU_REGS_RDI, regs->rdi);
kvm_register_write(vcpu, VCPU_REGS_RSP, regs->rsp);
kvm_register_write(vcpu, VCPU_REGS_RBP, regs->rbp);
#ifdef CONFIG_X86_64
kvm_register_write(vcpu, VCPU_REGS_R8, regs->r8);
kvm_register_write(vcpu, VCPU_REGS_R9, regs->r9);
kvm_register_write(vcpu, VCPU_REGS_R10, regs->r10);
kvm_register_write(vcpu, VCPU_REGS_R11, regs->r11);
kvm_register_write(vcpu, VCPU_REGS_R12, regs->r12);
kvm_register_write(vcpu, VCPU_REGS_R13, regs->r13);
kvm_register_write(vcpu, VCPU_REGS_R14, regs->r14);
kvm_register_write(vcpu, VCPU_REGS_R15, regs->r15);
#endif
kvm_rip_write(vcpu, regs->rip);
kvm_set_rflags(vcpu, regs->rflags);
vcpu->arch.exception.pending = false;
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
}
void kvm_get_cs_db_l_bits(struct kvm_vcpu *vcpu, int *db, int *l)
{
struct kvm_segment cs;
kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
*db = cs.db;
*l = cs.l;
}
EXPORT_SYMBOL_GPL(kvm_get_cs_db_l_bits);
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
struct desc_ptr dt;
kvm_get_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
kvm_get_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
kvm_get_segment(vcpu, &sregs->es, VCPU_SREG_ES);
kvm_get_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
kvm_get_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
kvm_get_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
kvm_get_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
kvm_get_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
kvm_x86_ops->get_idt(vcpu, &dt);
sregs->idt.limit = dt.size;
sregs->idt.base = dt.address;
kvm_x86_ops->get_gdt(vcpu, &dt);
sregs->gdt.limit = dt.size;
sregs->gdt.base = dt.address;
sregs->cr0 = kvm_read_cr0(vcpu);
sregs->cr2 = vcpu->arch.cr2;
sregs->cr3 = kvm_read_cr3(vcpu);
sregs->cr4 = kvm_read_cr4(vcpu);
sregs->cr8 = kvm_get_cr8(vcpu);
sregs->efer = vcpu->arch.efer;
sregs->apic_base = kvm_get_apic_base(vcpu);
memset(sregs->interrupt_bitmap, 0, sizeof sregs->interrupt_bitmap);
if (vcpu->arch.interrupt.pending && !vcpu->arch.interrupt.soft)
set_bit(vcpu->arch.interrupt.nr,
(unsigned long *)sregs->interrupt_bitmap);
return 0;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
kvm_apic_accept_events(vcpu);
mp_state->mp_state = vcpu->arch.mp_state;
return 0;
}
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
if (!kvm_vcpu_has_lapic(vcpu) &&
mp_state->mp_state != KVM_MP_STATE_RUNNABLE)
return -EINVAL;
if (mp_state->mp_state == KVM_MP_STATE_SIPI_RECEIVED) {
vcpu->arch.mp_state = KVM_MP_STATE_INIT_RECEIVED;
set_bit(KVM_APIC_SIPI, &vcpu->arch.apic->pending_events);
} else
vcpu->arch.mp_state = mp_state->mp_state;
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
}
int kvm_task_switch(struct kvm_vcpu *vcpu, u16 tss_selector, int idt_index,
int reason, bool has_error_code, u32 error_code)
{
struct x86_emulate_ctxt *ctxt = &vcpu->arch.emulate_ctxt;
int ret;
init_emulate_ctxt(vcpu);
ret = emulator_task_switch(ctxt, tss_selector, idt_index, reason,
has_error_code, error_code);
if (ret)
return EMULATE_FAIL;
kvm_rip_write(vcpu, ctxt->eip);
kvm_set_rflags(vcpu, ctxt->eflags);
kvm_make_request(KVM_REQ_EVENT, vcpu);
return EMULATE_DONE;
}
EXPORT_SYMBOL_GPL(kvm_task_switch);
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
int mmu_reset_needed = 0;
int pending_vec, max_bits, idx;
struct desc_ptr dt;
if (!guest_cpuid_has_xsave(vcpu) && (sregs->cr4 & X86_CR4_OSXSAVE))
return -EINVAL;
dt.size = sregs->idt.limit;
dt.address = sregs->idt.base;
kvm_x86_ops->set_idt(vcpu, &dt);
dt.size = sregs->gdt.limit;
dt.address = sregs->gdt.base;
kvm_x86_ops->set_gdt(vcpu, &dt);
vcpu->arch.cr2 = sregs->cr2;
mmu_reset_needed |= kvm_read_cr3(vcpu) != sregs->cr3;
vcpu->arch.cr3 = sregs->cr3;
__set_bit(VCPU_EXREG_CR3, (ulong *)&vcpu->arch.regs_avail);
kvm_set_cr8(vcpu, sregs->cr8);
mmu_reset_needed |= vcpu->arch.efer != sregs->efer;
kvm_x86_ops->set_efer(vcpu, sregs->efer);
kvm_set_apic_base(vcpu, sregs->apic_base);
mmu_reset_needed |= kvm_read_cr0(vcpu) != sregs->cr0;
kvm_x86_ops->set_cr0(vcpu, sregs->cr0);
vcpu->arch.cr0 = sregs->cr0;
mmu_reset_needed |= kvm_read_cr4(vcpu) != sregs->cr4;
kvm_x86_ops->set_cr4(vcpu, sregs->cr4);
if (sregs->cr4 & X86_CR4_OSXSAVE)
kvm_update_cpuid(vcpu);
idx = srcu_read_lock(&vcpu->kvm->srcu);
if (!is_long_mode(vcpu) && is_pae(vcpu)) {
load_pdptrs(vcpu, vcpu->arch.walk_mmu, kvm_read_cr3(vcpu));
mmu_reset_needed = 1;
}
srcu_read_unlock(&vcpu->kvm->srcu, idx);
if (mmu_reset_needed)
kvm_mmu_reset_context(vcpu);
max_bits = KVM_NR_INTERRUPTS;
pending_vec = find_first_bit(
(const unsigned long *)sregs->interrupt_bitmap, max_bits);
if (pending_vec < max_bits) {
kvm_queue_interrupt(vcpu, pending_vec, false);
pr_debug("Set back pending irq %d\n", pending_vec);
}
kvm_set_segment(vcpu, &sregs->cs, VCPU_SREG_CS);
kvm_set_segment(vcpu, &sregs->ds, VCPU_SREG_DS);
kvm_set_segment(vcpu, &sregs->es, VCPU_SREG_ES);
kvm_set_segment(vcpu, &sregs->fs, VCPU_SREG_FS);
kvm_set_segment(vcpu, &sregs->gs, VCPU_SREG_GS);
kvm_set_segment(vcpu, &sregs->ss, VCPU_SREG_SS);
kvm_set_segment(vcpu, &sregs->tr, VCPU_SREG_TR);
kvm_set_segment(vcpu, &sregs->ldt, VCPU_SREG_LDTR);
update_cr8_intercept(vcpu);
/* Older userspace won't unhalt the vcpu on reset. */
if (kvm_vcpu_is_bsp(vcpu) && kvm_rip_read(vcpu) == 0xfff0 &&
sregs->cs.selector == 0xf000 && sregs->cs.base == 0xffff0000 &&
!is_protmode(vcpu))
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
kvm_make_request(KVM_REQ_EVENT, vcpu);
return 0;
}
int kvm_arch_vcpu_ioctl_set_guest_debug(struct kvm_vcpu *vcpu,
struct kvm_guest_debug *dbg)
{
unsigned long rflags;
int i, r;
if (dbg->control & (KVM_GUESTDBG_INJECT_DB | KVM_GUESTDBG_INJECT_BP)) {
r = -EBUSY;
if (vcpu->arch.exception.pending)
goto out;
if (dbg->control & KVM_GUESTDBG_INJECT_DB)
kvm_queue_exception(vcpu, DB_VECTOR);
else
kvm_queue_exception(vcpu, BP_VECTOR);
}
/*
* Read rflags as long as potentially injected trace flags are still
* filtered out.
*/
rflags = kvm_get_rflags(vcpu);
vcpu->guest_debug = dbg->control;
if (!(vcpu->guest_debug & KVM_GUESTDBG_ENABLE))
vcpu->guest_debug = 0;
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP) {
for (i = 0; i < KVM_NR_DB_REGS; ++i)
vcpu->arch.eff_db[i] = dbg->arch.debugreg[i];
vcpu->arch.guest_debug_dr7 = dbg->arch.debugreg[7];
} else {
for (i = 0; i < KVM_NR_DB_REGS; i++)
vcpu->arch.eff_db[i] = vcpu->arch.db[i];
}
kvm_update_dr7(vcpu);
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
vcpu->arch.singlestep_rip = kvm_rip_read(vcpu) +
get_segment_base(vcpu, VCPU_SREG_CS);
/*
* Trigger an rflags update that will inject or remove the trace
* flags.
*/
kvm_set_rflags(vcpu, rflags);
kvm_x86_ops->update_db_bp_intercept(vcpu);
r = 0;
out:
return r;
}
/*
* Translate a guest virtual address to a guest physical address.
*/
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
struct kvm_translation *tr)
{
unsigned long vaddr = tr->linear_address;
gpa_t gpa;
int idx;
idx = srcu_read_lock(&vcpu->kvm->srcu);
gpa = kvm_mmu_gva_to_gpa_system(vcpu, vaddr, NULL);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
tr->physical_address = gpa;
tr->valid = gpa != UNMAPPED_GVA;
tr->writeable = 1;
tr->usermode = 0;
return 0;
}
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
struct i387_fxsave_struct *fxsave =
&vcpu->arch.guest_fpu.state->fxsave;
memcpy(fpu->fpr, fxsave->st_space, 128);
fpu->fcw = fxsave->cwd;
fpu->fsw = fxsave->swd;
fpu->ftwx = fxsave->twd;
fpu->last_opcode = fxsave->fop;
fpu->last_ip = fxsave->rip;
fpu->last_dp = fxsave->rdp;
memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
return 0;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
struct i387_fxsave_struct *fxsave =
&vcpu->arch.guest_fpu.state->fxsave;
memcpy(fxsave->st_space, fpu->fpr, 128);
fxsave->cwd = fpu->fcw;
fxsave->swd = fpu->fsw;
fxsave->twd = fpu->ftwx;
fxsave->fop = fpu->last_opcode;
fxsave->rip = fpu->last_ip;
fxsave->rdp = fpu->last_dp;
memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
return 0;
}
int fx_init(struct kvm_vcpu *vcpu)
{
int err;
err = fpu_alloc(&vcpu->arch.guest_fpu);
if (err)
return err;
fpu_finit(&vcpu->arch.guest_fpu);
/*
* Ensure guest xcr0 is valid for loading
*/
vcpu->arch.xcr0 = XSTATE_FP;
vcpu->arch.cr0 |= X86_CR0_ET;
return 0;
}
EXPORT_SYMBOL_GPL(fx_init);
static void fx_free(struct kvm_vcpu *vcpu)
{
fpu_free(&vcpu->arch.guest_fpu);
}
void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
{
if (vcpu->guest_fpu_loaded)
return;
/*
* Restore all possible states in the guest,
* and assume host would use all available bits.
* Guest xcr0 would be loaded later.
*/
kvm_put_guest_xcr0(vcpu);
vcpu->guest_fpu_loaded = 1;
__kernel_fpu_begin();
fpu_restore_checking(&vcpu->arch.guest_fpu);
trace_kvm_fpu(1);
}
void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
{
kvm_put_guest_xcr0(vcpu);
if (!vcpu->guest_fpu_loaded)
return;
vcpu->guest_fpu_loaded = 0;
fpu_save_init(&vcpu->arch.guest_fpu);
__kernel_fpu_end();
++vcpu->stat.fpu_reload;
kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
trace_kvm_fpu(0);
}
void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
kvmclock_reset(vcpu);
free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
fx_free(vcpu);
kvm_x86_ops->vcpu_free(vcpu);
}
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm,
unsigned int id)
{
if (check_tsc_unstable() && atomic_read(&kvm->online_vcpus) != 0)
printk_once(KERN_WARNING
"kvm: SMP vm created on host with unstable TSC; "
"guest TSC will not be reliable\n");
return kvm_x86_ops->vcpu_create(kvm, id);
}
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
int r;
vcpu->arch.mtrr_state.have_fixed = 1;
r = vcpu_load(vcpu);
if (r)
return r;
kvm_vcpu_reset(vcpu);
r = kvm_mmu_setup(vcpu);
vcpu_put(vcpu);
return r;
}
int kvm_arch_vcpu_postcreate(struct kvm_vcpu *vcpu)
{
int r;
struct msr_data msr;
r = vcpu_load(vcpu);
if (r)
return r;
msr.data = 0x0;
msr.index = MSR_IA32_TSC;
msr.host_initiated = true;
kvm_write_tsc(vcpu, &msr);
vcpu_put(vcpu);
return r;
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
int r;
vcpu->arch.apf.msr_val = 0;
r = vcpu_load(vcpu);
BUG_ON(r);
kvm_mmu_unload(vcpu);
vcpu_put(vcpu);
fx_free(vcpu);
kvm_x86_ops->vcpu_free(vcpu);
}
void kvm_vcpu_reset(struct kvm_vcpu *vcpu)
{
atomic_set(&vcpu->arch.nmi_queued, 0);
vcpu->arch.nmi_pending = 0;
vcpu->arch.nmi_injected = false;
memset(vcpu->arch.db, 0, sizeof(vcpu->arch.db));
vcpu->arch.dr6 = DR6_FIXED_1;
vcpu->arch.dr7 = DR7_FIXED_1;
kvm_update_dr7(vcpu);
kvm_make_request(KVM_REQ_EVENT, vcpu);
vcpu->arch.apf.msr_val = 0;
vcpu->arch.st.msr_val = 0;
kvmclock_reset(vcpu);
kvm_clear_async_pf_completion_queue(vcpu);
kvm_async_pf_hash_reset(vcpu);
vcpu->arch.apf.halted = false;
kvm_pmu_reset(vcpu);
memset(vcpu->arch.regs, 0, sizeof(vcpu->arch.regs));
vcpu->arch.regs_avail = ~0;
vcpu->arch.regs_dirty = ~0;
kvm_x86_ops->vcpu_reset(vcpu);
}
void kvm_vcpu_deliver_sipi_vector(struct kvm_vcpu *vcpu, unsigned int vector)
{
struct kvm_segment cs;
kvm_get_segment(vcpu, &cs, VCPU_SREG_CS);
cs.selector = vector << 8;
cs.base = vector << 12;
kvm_set_segment(vcpu, &cs, VCPU_SREG_CS);
kvm_rip_write(vcpu, 0);
}
int kvm_arch_hardware_enable(void *garbage)
{
struct kvm *kvm;
struct kvm_vcpu *vcpu;
int i;
int ret;
u64 local_tsc;
u64 max_tsc = 0;
bool stable, backwards_tsc = false;
kvm_shared_msr_cpu_online();
ret = kvm_x86_ops->hardware_enable(garbage);
if (ret != 0)
return ret;
local_tsc = native_read_tsc();
stable = !check_tsc_unstable();
list_for_each_entry(kvm, &vm_list, vm_list) {
kvm_for_each_vcpu(i, vcpu, kvm) {
if (!stable && vcpu->cpu == smp_processor_id())
set_bit(KVM_REQ_CLOCK_UPDATE, &vcpu->requests);
if (stable && vcpu->arch.last_host_tsc > local_tsc) {
backwards_tsc = true;
if (vcpu->arch.last_host_tsc > max_tsc)
max_tsc = vcpu->arch.last_host_tsc;
}
}
}
/*
* Sometimes, even reliable TSCs go backwards. This happens on
* platforms that reset TSC during suspend or hibernate actions, but
* maintain synchronization. We must compensate. Fortunately, we can
* detect that condition here, which happens early in CPU bringup,
* before any KVM threads can be running. Unfortunately, we can't
* bring the TSCs fully up to date with real time, as we aren't yet far
* enough into CPU bringup that we know how much real time has actually
* elapsed; our helper function, get_kernel_ns() will be using boot
* variables that haven't been updated yet.
*
* So we simply find the maximum observed TSC above, then record the
* adjustment to TSC in each VCPU. When the VCPU later gets loaded,
* the adjustment will be applied. Note that we accumulate
* adjustments, in case multiple suspend cycles happen before some VCPU
* gets a chance to run again. In the event that no KVM threads get a
* chance to run, we will miss the entire elapsed period, as we'll have
* reset last_host_tsc, so VCPUs will not have the TSC adjusted and may
* loose cycle time. This isn't too big a deal, since the loss will be
* uniform across all VCPUs (not to mention the scenario is extremely
* unlikely). It is possible that a second hibernate recovery happens
* much faster than a first, causing the observed TSC here to be
* smaller; this would require additional padding adjustment, which is
* why we set last_host_tsc to the local tsc observed here.
*
* N.B. - this code below runs only on platforms with reliable TSC,
* as that is the only way backwards_tsc is set above. Also note
* that this runs for ALL vcpus, which is not a bug; all VCPUs should
* have the same delta_cyc adjustment applied if backwards_tsc
* is detected. Note further, this adjustment is only done once,
* as we reset last_host_tsc on all VCPUs to stop this from being
* called multiple times (one for each physical CPU bringup).
*
* Platforms with unreliable TSCs don't have to deal with this, they
* will be compensated by the logic in vcpu_load, which sets the TSC to
* catchup mode. This will catchup all VCPUs to real time, but cannot
* guarantee that they stay in perfect synchronization.
*/
if (backwards_tsc) {
u64 delta_cyc = max_tsc - local_tsc;
list_for_each_entry(kvm, &vm_list, vm_list) {
kvm_for_each_vcpu(i, vcpu, kvm) {
vcpu->arch.tsc_offset_adjustment += delta_cyc;
vcpu->arch.last_host_tsc = local_tsc;
set_bit(KVM_REQ_MASTERCLOCK_UPDATE,
&vcpu->requests);
}
/*
* We have to disable TSC offset matching.. if you were
* booting a VM while issuing an S4 host suspend....
* you may have some problem. Solving this issue is
* left as an exercise to the reader.
*/
kvm->arch.last_tsc_nsec = 0;
kvm->arch.last_tsc_write = 0;
}
}
return 0;
}
void kvm_arch_hardware_disable(void *garbage)
{
kvm_x86_ops->hardware_disable(garbage);
drop_user_return_notifiers(garbage);
}
int kvm_arch_hardware_setup(void)
{
return kvm_x86_ops->hardware_setup();
}
void kvm_arch_hardware_unsetup(void)
{
kvm_x86_ops->hardware_unsetup();
}
void kvm_arch_check_processor_compat(void *rtn)
{
kvm_x86_ops->check_processor_compatibility(rtn);
}
bool kvm_vcpu_compatible(struct kvm_vcpu *vcpu)
{
return irqchip_in_kernel(vcpu->kvm) == (vcpu->arch.apic != NULL);
}
struct static_key kvm_no_apic_vcpu __read_mostly;
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
struct page *page;
struct kvm *kvm;
int r;
BUG_ON(vcpu->kvm == NULL);
kvm = vcpu->kvm;
vcpu->arch.emulate_ctxt.ops = &emulate_ops;
if (!irqchip_in_kernel(kvm) || kvm_vcpu_is_bsp(vcpu))
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
else
vcpu->arch.mp_state = KVM_MP_STATE_UNINITIALIZED;
page = alloc_page(GFP_KERNEL | __GFP_ZERO);
if (!page) {
r = -ENOMEM;
goto fail;
}
vcpu->arch.pio_data = page_address(page);
kvm_set_tsc_khz(vcpu, max_tsc_khz);
r = kvm_mmu_create(vcpu);
if (r < 0)
goto fail_free_pio_data;
if (irqchip_in_kernel(kvm)) {
r = kvm_create_lapic(vcpu);
if (r < 0)
goto fail_mmu_destroy;
} else
static_key_slow_inc(&kvm_no_apic_vcpu);
vcpu->arch.mce_banks = kzalloc(KVM_MAX_MCE_BANKS * sizeof(u64) * 4,
GFP_KERNEL);
if (!vcpu->arch.mce_banks) {
r = -ENOMEM;
goto fail_free_lapic;
}
vcpu->arch.mcg_cap = KVM_MAX_MCE_BANKS;
if (!zalloc_cpumask_var(&vcpu->arch.wbinvd_dirty_mask, GFP_KERNEL)) {
r = -ENOMEM;
goto fail_free_mce_banks;
}
r = fx_init(vcpu);
if (r)
goto fail_free_wbinvd_dirty_mask;
vcpu->arch.ia32_tsc_adjust_msr = 0x0;
vcpu->arch.pv_time_enabled = false;
kvm_async_pf_hash_reset(vcpu);
kvm_pmu_init(vcpu);
return 0;
fail_free_wbinvd_dirty_mask:
free_cpumask_var(vcpu->arch.wbinvd_dirty_mask);
fail_free_mce_banks:
kfree(vcpu->arch.mce_banks);
fail_free_lapic:
kvm_free_lapic(vcpu);
fail_mmu_destroy:
kvm_mmu_destroy(vcpu);
fail_free_pio_data:
free_page((unsigned long)vcpu->arch.pio_data);
fail:
return r;
}
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
int idx;
kvm_pmu_destroy(vcpu);
kfree(vcpu->arch.mce_banks);
kvm_free_lapic(vcpu);
idx = srcu_read_lock(&vcpu->kvm->srcu);
kvm_mmu_destroy(vcpu);
srcu_read_unlock(&vcpu->kvm->srcu, idx);
free_page((unsigned long)vcpu->arch.pio_data);
if (!irqchip_in_kernel(vcpu->kvm))
static_key_slow_dec(&kvm_no_apic_vcpu);
}
int kvm_arch_init_vm(struct kvm *kvm, unsigned long type)
{
if (type)
return -EINVAL;
INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
INIT_LIST_HEAD(&kvm->arch.zapped_obsolete_pages);
INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
/* Reserve bit 0 of irq_sources_bitmap for userspace irq source */
set_bit(KVM_USERSPACE_IRQ_SOURCE_ID, &kvm->arch.irq_sources_bitmap);
/* Reserve bit 1 of irq_sources_bitmap for irqfd-resampler */
set_bit(KVM_IRQFD_RESAMPLE_IRQ_SOURCE_ID,
&kvm->arch.irq_sources_bitmap);
raw_spin_lock_init(&kvm->arch.tsc_write_lock);
mutex_init(&kvm->arch.apic_map_lock);
spin_lock_init(&kvm->arch.pvclock_gtod_sync_lock);
pvclock_update_vm_gtod_copy(kvm);
return 0;
}
static void kvm_unload_vcpu_mmu(struct kvm_vcpu *vcpu)
{
int r;
r = vcpu_load(vcpu);
BUG_ON(r);
kvm_mmu_unload(vcpu);
vcpu_put(vcpu);
}
static void kvm_free_vcpus(struct kvm *kvm)
{
unsigned int i;
struct kvm_vcpu *vcpu;
/*
* Unpin any mmu pages first.
*/
kvm_for_each_vcpu(i, vcpu, kvm) {
kvm_clear_async_pf_completion_queue(vcpu);
kvm_unload_vcpu_mmu(vcpu);
}
kvm_for_each_vcpu(i, vcpu, kvm)
kvm_arch_vcpu_free(vcpu);
mutex_lock(&kvm->lock);
for (i = 0; i < atomic_read(&kvm->online_vcpus); i++)
kvm->vcpus[i] = NULL;
atomic_set(&kvm->online_vcpus, 0);
mutex_unlock(&kvm->lock);
}
void kvm_arch_sync_events(struct kvm *kvm)
{
kvm_free_all_assigned_devices(kvm);
kvm_free_pit(kvm);
}
void kvm_arch_destroy_vm(struct kvm *kvm)
{
if (current->mm == kvm->mm) {
/*
* Free memory regions allocated on behalf of userspace,
* unless the the memory map has changed due to process exit
* or fd copying.
*/
struct kvm_userspace_memory_region mem;
memset(&mem, 0, sizeof(mem));
mem.slot = APIC_ACCESS_PAGE_PRIVATE_MEMSLOT;
kvm_set_memory_region(kvm, &mem);
mem.slot = IDENTITY_PAGETABLE_PRIVATE_MEMSLOT;
kvm_set_memory_region(kvm, &mem);
mem.slot = TSS_PRIVATE_MEMSLOT;
kvm_set_memory_region(kvm, &mem);
}
kvm_iommu_unmap_guest(kvm);
kfree(kvm->arch.vpic);
kfree(kvm->arch.vioapic);
kvm_free_vcpus(kvm);
if (kvm->arch.apic_access_page)
put_page(kvm->arch.apic_access_page);
if (kvm->arch.ept_identity_pagetable)
put_page(kvm->arch.ept_identity_pagetable);
kfree(rcu_dereference_check(kvm->arch.apic_map, 1));
}
void kvm_arch_free_memslot(struct kvm_memory_slot *free,
struct kvm_memory_slot *dont)
{
int i;
for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
if (!dont || free->arch.rmap[i] != dont->arch.rmap[i]) {
kvm_kvfree(free->arch.rmap[i]);
free->arch.rmap[i] = NULL;
}
if (i == 0)
continue;
if (!dont || free->arch.lpage_info[i - 1] !=
dont->arch.lpage_info[i - 1]) {
kvm_kvfree(free->arch.lpage_info[i - 1]);
free->arch.lpage_info[i - 1] = NULL;
}
}
}
int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
{
int i;
for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
unsigned long ugfn;
int lpages;
int level = i + 1;
lpages = gfn_to_index(slot->base_gfn + npages - 1,
slot->base_gfn, level) + 1;
slot->arch.rmap[i] =
kvm_kvzalloc(lpages * sizeof(*slot->arch.rmap[i]));
if (!slot->arch.rmap[i])
goto out_free;
if (i == 0)
continue;
slot->arch.lpage_info[i - 1] = kvm_kvzalloc(lpages *
sizeof(*slot->arch.lpage_info[i - 1]));
if (!slot->arch.lpage_info[i - 1])
goto out_free;
if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
slot->arch.lpage_info[i - 1][0].write_count = 1;
if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
slot->arch.lpage_info[i - 1][lpages - 1].write_count = 1;
ugfn = slot->userspace_addr >> PAGE_SHIFT;
/*
* If the gfn and userspace address are not aligned wrt each
* other, or if explicitly asked to, disable large page
* support for this slot
*/
if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
!kvm_largepages_enabled()) {
unsigned long j;
for (j = 0; j < lpages; ++j)
slot->arch.lpage_info[i - 1][j].write_count = 1;
}
}
return 0;
out_free:
for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
kvm_kvfree(slot->arch.rmap[i]);
slot->arch.rmap[i] = NULL;
if (i == 0)
continue;
kvm_kvfree(slot->arch.lpage_info[i - 1]);
slot->arch.lpage_info[i - 1] = NULL;
}
return -ENOMEM;
}
void kvm_arch_memslots_updated(struct kvm *kvm)
{
/*
* memslots->generation has been incremented.
* mmio generation may have reached its maximum value.
*/
kvm_mmu_invalidate_mmio_sptes(kvm);
}
int kvm_arch_prepare_memory_region(struct kvm *kvm,
struct kvm_memory_slot *memslot,
struct kvm_userspace_memory_region *mem,
enum kvm_mr_change change)
{
/*
* Only private memory slots need to be mapped here since
* KVM_SET_MEMORY_REGION ioctl is no longer supported.
*/
if ((memslot->id >= KVM_USER_MEM_SLOTS) && (change == KVM_MR_CREATE)) {
unsigned long userspace_addr;
/*
* MAP_SHARED to prevent internal slot pages from being moved
* by fork()/COW.
*/
userspace_addr = vm_mmap(NULL, 0, memslot->npages * PAGE_SIZE,
PROT_READ | PROT_WRITE,
MAP_SHARED | MAP_ANONYMOUS, 0);
if (IS_ERR((void *)userspace_addr))
return PTR_ERR((void *)userspace_addr);
memslot->userspace_addr = userspace_addr;
}
return 0;
}
void kvm_arch_commit_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
const struct kvm_memory_slot *old,
enum kvm_mr_change change)
{
int nr_mmu_pages = 0;
if ((mem->slot >= KVM_USER_MEM_SLOTS) && (change == KVM_MR_DELETE)) {
int ret;
ret = vm_munmap(old->userspace_addr,
old->npages * PAGE_SIZE);
if (ret < 0)
printk(KERN_WARNING
"kvm_vm_ioctl_set_memory_region: "
"failed to munmap memory\n");
}
if (!kvm->arch.n_requested_mmu_pages)
nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
if (nr_mmu_pages)
kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
/*
* Write protect all pages for dirty logging.
* Existing largepage mappings are destroyed here and new ones will
* not be created until the end of the logging.
*/
if ((change != KVM_MR_DELETE) && (mem->flags & KVM_MEM_LOG_DIRTY_PAGES))
kvm_mmu_slot_remove_write_access(kvm, mem->slot);
}
void kvm_arch_flush_shadow_all(struct kvm *kvm)
{
kvm_mmu_invalidate_zap_all_pages(kvm);
}
void kvm_arch_flush_shadow_memslot(struct kvm *kvm,
struct kvm_memory_slot *slot)
{
kvm_mmu_invalidate_zap_all_pages(kvm);
}
int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
{
return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE &&
!vcpu->arch.apf.halted)
|| !list_empty_careful(&vcpu->async_pf.done)
|| kvm_apic_has_events(vcpu)
|| atomic_read(&vcpu->arch.nmi_queued) ||
(kvm_arch_interrupt_allowed(vcpu) &&
kvm_cpu_has_interrupt(vcpu));
}
int kvm_arch_vcpu_should_kick(struct kvm_vcpu *vcpu)
{
return kvm_vcpu_exiting_guest_mode(vcpu) == IN_GUEST_MODE;
}
int kvm_arch_interrupt_allowed(struct kvm_vcpu *vcpu)
{
return kvm_x86_ops->interrupt_allowed(vcpu);
}
bool kvm_is_linear_rip(struct kvm_vcpu *vcpu, unsigned long linear_rip)
{
unsigned long current_rip = kvm_rip_read(vcpu) +
get_segment_base(vcpu, VCPU_SREG_CS);
return current_rip == linear_rip;
}
EXPORT_SYMBOL_GPL(kvm_is_linear_rip);
unsigned long kvm_get_rflags(struct kvm_vcpu *vcpu)
{
unsigned long rflags;
rflags = kvm_x86_ops->get_rflags(vcpu);
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
rflags &= ~X86_EFLAGS_TF;
return rflags;
}
EXPORT_SYMBOL_GPL(kvm_get_rflags);
void kvm_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
{
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP &&
kvm_is_linear_rip(vcpu, vcpu->arch.singlestep_rip))
rflags |= X86_EFLAGS_TF;
kvm_x86_ops->set_rflags(vcpu, rflags);
kvm_make_request(KVM_REQ_EVENT, vcpu);
}
EXPORT_SYMBOL_GPL(kvm_set_rflags);
void kvm_arch_async_page_ready(struct kvm_vcpu *vcpu, struct kvm_async_pf *work)
{
int r;
if ((vcpu->arch.mmu.direct_map != work->arch.direct_map) ||
is_error_page(work->page))
return;
r = kvm_mmu_reload(vcpu);
if (unlikely(r))
return;
if (!vcpu->arch.mmu.direct_map &&
work->arch.cr3 != vcpu->arch.mmu.get_cr3(vcpu))
return;
vcpu->arch.mmu.page_fault(vcpu, work->gva, 0, true);
}
static inline u32 kvm_async_pf_hash_fn(gfn_t gfn)
{
return hash_32(gfn & 0xffffffff, order_base_2(ASYNC_PF_PER_VCPU));
}
static inline u32 kvm_async_pf_next_probe(u32 key)
{
return (key + 1) & (roundup_pow_of_two(ASYNC_PF_PER_VCPU) - 1);
}
static void kvm_add_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
{
u32 key = kvm_async_pf_hash_fn(gfn);
while (vcpu->arch.apf.gfns[key] != ~0)
key = kvm_async_pf_next_probe(key);
vcpu->arch.apf.gfns[key] = gfn;
}
static u32 kvm_async_pf_gfn_slot(struct kvm_vcpu *vcpu, gfn_t gfn)
{
int i;
u32 key = kvm_async_pf_hash_fn(gfn);
for (i = 0; i < roundup_pow_of_two(ASYNC_PF_PER_VCPU) &&
(vcpu->arch.apf.gfns[key] != gfn &&
vcpu->arch.apf.gfns[key] != ~0); i++)
key = kvm_async_pf_next_probe(key);
return key;
}
bool kvm_find_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
{
return vcpu->arch.apf.gfns[kvm_async_pf_gfn_slot(vcpu, gfn)] == gfn;
}
static void kvm_del_async_pf_gfn(struct kvm_vcpu *vcpu, gfn_t gfn)
{
u32 i, j, k;
i = j = kvm_async_pf_gfn_slot(vcpu, gfn);
while (true) {
vcpu->arch.apf.gfns[i] = ~0;
do {
j = kvm_async_pf_next_probe(j);
if (vcpu->arch.apf.gfns[j] == ~0)
return;
k = kvm_async_pf_hash_fn(vcpu->arch.apf.gfns[j]);
/*
* k lies cyclically in ]i,j]
* | i.k.j |
* |....j i.k.| or |.k..j i...|
*/
} while ((i <= j) ? (i < k && k <= j) : (i < k || k <= j));
vcpu->arch.apf.gfns[i] = vcpu->arch.apf.gfns[j];
i = j;
}
}
static int apf_put_user(struct kvm_vcpu *vcpu, u32 val)
{
return kvm_write_guest_cached(vcpu->kvm, &vcpu->arch.apf.data, &val,
sizeof(val));
}
void kvm_arch_async_page_not_present(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work)
{
struct x86_exception fault;
trace_kvm_async_pf_not_present(work->arch.token, work->gva);
kvm_add_async_pf_gfn(vcpu, work->arch.gfn);
if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) ||
(vcpu->arch.apf.send_user_only &&
kvm_x86_ops->get_cpl(vcpu) == 0))
kvm_make_request(KVM_REQ_APF_HALT, vcpu);
else if (!apf_put_user(vcpu, KVM_PV_REASON_PAGE_NOT_PRESENT)) {
fault.vector = PF_VECTOR;
fault.error_code_valid = true;
fault.error_code = 0;
fault.nested_page_fault = false;
fault.address = work->arch.token;
kvm_inject_page_fault(vcpu, &fault);
}
}
void kvm_arch_async_page_present(struct kvm_vcpu *vcpu,
struct kvm_async_pf *work)
{
struct x86_exception fault;
trace_kvm_async_pf_ready(work->arch.token, work->gva);
if (is_error_page(work->page))
work->arch.token = ~0; /* broadcast wakeup */
else
kvm_del_async_pf_gfn(vcpu, work->arch.gfn);
if ((vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED) &&
!apf_put_user(vcpu, KVM_PV_REASON_PAGE_READY)) {
fault.vector = PF_VECTOR;
fault.error_code_valid = true;
fault.error_code = 0;
fault.nested_page_fault = false;
fault.address = work->arch.token;
kvm_inject_page_fault(vcpu, &fault);
}
vcpu->arch.apf.halted = false;
vcpu->arch.mp_state = KVM_MP_STATE_RUNNABLE;
}
bool kvm_arch_can_inject_async_page_present(struct kvm_vcpu *vcpu)
{
if (!(vcpu->arch.apf.msr_val & KVM_ASYNC_PF_ENABLED))
return true;
else
return !kvm_event_needs_reinjection(vcpu) &&
kvm_x86_ops->interrupt_allowed(vcpu);
}
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_exit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_inj_virq);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_page_fault);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_msr);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_cr);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmrun);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_vmexit_inject);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intr_vmexit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_invlpga);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_skinit);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_nested_intercepts);
EXPORT_TRACEPOINT_SYMBOL_GPL(kvm_write_tsc_offset);
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