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KVM: ppc: PowerPC 440 KVM implementation

Browse Source 
This functionality is definitely experimental, but is capable of running
unmodified PowerPC 440 Linux kernels as guests on a PowerPC 440 host. (Only
tested with 440EP "Bamboo" guests so far, but with appropriate userspace
support other SoC/board combinations should work.)

See Documentation/powerpc/kvm_440.txt for technical details.

[stephen: build fix]

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Acked-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Hollis Blanchard 2008-04-16 23:28:09 -05:00 committed by Avi Kivity
parent 513014b717
commit bbf45ba57e
19 changed files with 3159 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
Documentation/powerpc/kvm_440.txt Normal file
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@ -0,0 +1,41 @@
Hollis Blanchard <hollisb@us.ibm.com>
15 Apr 2008
Various notes on the implementation of KVM for PowerPC 440:
To enforce isolation, host userspace, guest kernel, and guest userspace all
run at user privilege level. Only the host kernel runs in supervisor mode.
Executing privileged instructions in the guest traps into KVM (in the host
kernel), where we decode and emulate them. Through this technique, unmodified
440 Linux kernels can be run (slowly) as guests. Future performance work will
focus on reducing the overhead and frequency of these traps.
The usual code flow is started from userspace invoking an "run" ioctl, which
causes KVM to switch into guest context. We use IVPR to hijack the host
interrupt vectors while running the guest, which allows us to direct all
interrupts to kvmppc_handle_interrupt(). At this point, we could either
- handle the interrupt completely (e.g. emulate "mtspr SPRG0"), or
- let the host interrupt handler run (e.g. when the decrementer fires), or
- return to host userspace (e.g. when the guest performs device MMIO)
Address spaces: We take advantage of the fact that Linux doesn't use the AS=1
address space (in host or guest), which gives us virtual address space to use
for guest mappings. While the guest is running, the host kernel remains mapped
in AS=0, but the guest can only use AS=1 mappings.
TLB entries: The TLB entries covering the host linear mapping remain
present while running the guest. This reduces the overhead of lightweight
exits, which are handled by KVM running in the host kernel. We keep three
copies of the TLB:
- guest TLB: contents of the TLB as the guest sees it
- shadow TLB: the TLB that is actually in hardware while guest is running
- host TLB: to restore TLB state when context switching guest -> host
When a TLB miss occurs because a mapping was not present in the shadow TLB,
but was present in the guest TLB, KVM handles the fault without invoking the
guest. Large guest pages are backed by multiple 4KB shadow pages through this
mechanism.
IO: MMIO and DCR accesses are emulated by userspace. We use virtio for network
and block IO, so those drivers must be enabled in the guest. It's possible
that some qemu device emulation (e.g. e1000 or rtl8139) may also work with
little effort.

1
arch/powerpc/Kconfig
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@ -803,3 +803,4 @@ config PPC_CLOCK
config PPC_LIB_RHEAP
bool
source "arch/powerpc/kvm/Kconfig"

3
arch/powerpc/Kconfig.debug
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@ -151,6 +151,9 @@ config BOOTX_TEXT
config PPC_EARLY_DEBUG
bool "Early debugging (dangerous)"
# PPC_EARLY_DEBUG on 440 leaves AS=1 mappings above the TLB high water
# mark, which doesn't work with current 440 KVM.
depends on !KVM
help
Say Y to enable some early debugging facilities that may be available
for your processor/board combination. Those facilities are hacks

1
arch/powerpc/Makefile
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@ -145,6 +145,7 @@ core-y += arch/powerpc/kernel/ \
arch/powerpc/platforms/
core-$(CONFIG_MATH_EMULATION) += arch/powerpc/math-emu/
core-$(CONFIG_XMON) += arch/powerpc/xmon/
core-$(CONFIG_KVM) += arch/powerpc/kvm/
drivers-$(CONFIG_OPROFILE) += arch/powerpc/oprofile/

28
arch/powerpc/kernel/asm-offsets.c
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@ -23,6 +23,9 @@
#include <linux/mm.h>
#include <linux/suspend.h>
#include <linux/hrtimer.h>
#ifdef CONFIG_KVM
#include <linux/kvm_host.h>
#endif
#ifdef CONFIG_PPC64
#include <linux/time.h>
#include <linux/hardirq.h>
@ -324,5 +327,30 @@ int main(void)
DEFINE(PGD_TABLE_SIZE, PGD_TABLE_SIZE);
#ifdef CONFIG_KVM
DEFINE(TLBE_BYTES, sizeof(struct tlbe));
DEFINE(VCPU_HOST_STACK, offsetof(struct kvm_vcpu, arch.host_stack));
DEFINE(VCPU_HOST_PID, offsetof(struct kvm_vcpu, arch.host_pid));
DEFINE(VCPU_HOST_TLB, offsetof(struct kvm_vcpu, arch.host_tlb));
DEFINE(VCPU_SHADOW_TLB, offsetof(struct kvm_vcpu, arch.shadow_tlb));
DEFINE(VCPU_GPRS, offsetof(struct kvm_vcpu, arch.gpr));
DEFINE(VCPU_LR, offsetof(struct kvm_vcpu, arch.lr));
DEFINE(VCPU_CR, offsetof(struct kvm_vcpu, arch.cr));
DEFINE(VCPU_XER, offsetof(struct kvm_vcpu, arch.xer));
DEFINE(VCPU_CTR, offsetof(struct kvm_vcpu, arch.ctr));
DEFINE(VCPU_PC, offsetof(struct kvm_vcpu, arch.pc));
DEFINE(VCPU_MSR, offsetof(struct kvm_vcpu, arch.msr));
DEFINE(VCPU_SPRG4, offsetof(struct kvm_vcpu, arch.sprg4));
DEFINE(VCPU_SPRG5, offsetof(struct kvm_vcpu, arch.sprg5));
DEFINE(VCPU_SPRG6, offsetof(struct kvm_vcpu, arch.sprg6));
DEFINE(VCPU_SPRG7, offsetof(struct kvm_vcpu, arch.sprg7));
DEFINE(VCPU_PID, offsetof(struct kvm_vcpu, arch.pid));
DEFINE(VCPU_LAST_INST, offsetof(struct kvm_vcpu, arch.last_inst));
DEFINE(VCPU_FAULT_DEAR, offsetof(struct kvm_vcpu, arch.fault_dear));
DEFINE(VCPU_FAULT_ESR, offsetof(struct kvm_vcpu, arch.fault_esr));
#endif
return 0;
}

224
arch/powerpc/kvm/44x_tlb.c Normal file
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@ -0,0 +1,224 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm_host.h>
#include <linux/highmem.h>
#include <asm/mmu-44x.h>
#include <asm/kvm_ppc.h>
#include "44x_tlb.h"
#define PPC44x_TLB_USER_PERM_MASK (PPC44x_TLB_UX|PPC44x_TLB_UR|PPC44x_TLB_UW)
#define PPC44x_TLB_SUPER_PERM_MASK (PPC44x_TLB_SX|PPC44x_TLB_SR|PPC44x_TLB_SW)
static unsigned int kvmppc_tlb_44x_pos;
static u32 kvmppc_44x_tlb_shadow_attrib(u32 attrib, int usermode)
{
/* Mask off reserved bits. */
attrib &= PPC44x_TLB_PERM_MASK|PPC44x_TLB_ATTR_MASK;
if (!usermode) {
/* Guest is in supervisor mode, so we need to translate guest
* supervisor permissions into user permissions. */
attrib &= ~PPC44x_TLB_USER_PERM_MASK;
attrib |= (attrib & PPC44x_TLB_SUPER_PERM_MASK) << 3;
}
/* Make sure host can always access this memory. */
attrib |= PPC44x_TLB_SX|PPC44x_TLB_SR|PPC44x_TLB_SW;
return attrib;
}
/* Search the guest TLB for a matching entry. */
int kvmppc_44x_tlb_index(struct kvm_vcpu *vcpu, gva_t eaddr, unsigned int pid,
unsigned int as)
{
int i;
/* XXX Replace loop with fancy data structures. */
for (i = 0; i < PPC44x_TLB_SIZE; i++) {
struct tlbe *tlbe = &vcpu->arch.guest_tlb[i];
unsigned int tid;
if (eaddr < get_tlb_eaddr(tlbe))
continue;
if (eaddr > get_tlb_end(tlbe))
continue;
tid = get_tlb_tid(tlbe);
if (tid && (tid != pid))
continue;
if (!get_tlb_v(tlbe))
continue;
if (get_tlb_ts(tlbe) != as)
continue;
return i;
}
return -1;
}
struct tlbe *kvmppc_44x_itlb_search(struct kvm_vcpu *vcpu, gva_t eaddr)
{
unsigned int as = !!(vcpu->arch.msr & MSR_IS);
unsigned int index;
index = kvmppc_44x_tlb_index(vcpu, eaddr, vcpu->arch.pid, as);
if (index == -1)
return NULL;
return &vcpu->arch.guest_tlb[index];
}
struct tlbe *kvmppc_44x_dtlb_search(struct kvm_vcpu *vcpu, gva_t eaddr)
{
unsigned int as = !!(vcpu->arch.msr & MSR_DS);
unsigned int index;
index = kvmppc_44x_tlb_index(vcpu, eaddr, vcpu->arch.pid, as);
if (index == -1)
return NULL;
return &vcpu->arch.guest_tlb[index];
}
static int kvmppc_44x_tlbe_is_writable(struct tlbe *tlbe)
{
return tlbe->word2 & (PPC44x_TLB_SW|PPC44x_TLB_UW);
}
/* Must be called with mmap_sem locked for writing. */
static void kvmppc_44x_shadow_release(struct kvm_vcpu *vcpu,
unsigned int index)
{
struct tlbe *stlbe = &vcpu->arch.shadow_tlb[index];
struct page *page = vcpu->arch.shadow_pages[index];
kunmap(vcpu->arch.shadow_pages[index]);
if (get_tlb_v(stlbe)) {
if (kvmppc_44x_tlbe_is_writable(stlbe))
kvm_release_page_dirty(page);
else
kvm_release_page_clean(page);
}
}
/* Caller must ensure that the specified guest TLB entry is safe to insert into
* the shadow TLB. */
void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn, u64 asid,
u32 flags)
{
struct page *new_page;
struct tlbe *stlbe;
hpa_t hpaddr;
unsigned int victim;
/* Future optimization: don't overwrite the TLB entry containing the
* current PC (or stack?). */
victim = kvmppc_tlb_44x_pos++;
if (kvmppc_tlb_44x_pos > tlb_44x_hwater)
kvmppc_tlb_44x_pos = 0;
stlbe = &vcpu->arch.shadow_tlb[victim];
/* Get reference to new page. */
down_write(&current->mm->mmap_sem);
new_page = gfn_to_page(vcpu->kvm, gfn);
if (is_error_page(new_page)) {
printk(KERN_ERR "Couldn't get guest page!\n");
kvm_release_page_clean(new_page);
return;
}
hpaddr = page_to_phys(new_page);
/* Drop reference to old page. */
kvmppc_44x_shadow_release(vcpu, victim);
up_write(&current->mm->mmap_sem);
vcpu->arch.shadow_pages[victim] = new_page;
/* XXX Make sure (va, size) doesn't overlap any other
* entries. 440x6 user manual says the result would be
* "undefined." */
/* XXX what about AS? */
stlbe->tid = asid & 0xff;
/* Force TS=1 for all guest mappings. */
/* For now we hardcode 4KB mappings, but it will be important to
* use host large pages in the future. */
stlbe->word0 = (gvaddr & PAGE_MASK) | PPC44x_TLB_VALID | PPC44x_TLB_TS
| PPC44x_TLB_4K;
stlbe->word1 = (hpaddr & 0xfffffc00) | ((hpaddr >> 32) & 0xf);
stlbe->word2 = kvmppc_44x_tlb_shadow_attrib(flags,
vcpu->arch.msr & MSR_PR);
}
void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, u64 eaddr, u64 asid)
{
unsigned int pid = asid & 0xff;
int i;
/* XXX Replace loop with fancy data structures. */
down_write(&current->mm->mmap_sem);
for (i = 0; i <= tlb_44x_hwater; i++) {
struct tlbe *stlbe = &vcpu->arch.shadow_tlb[i];
unsigned int tid;
if (!get_tlb_v(stlbe))
continue;
if (eaddr < get_tlb_eaddr(stlbe))
continue;
if (eaddr > get_tlb_end(stlbe))
continue;
tid = get_tlb_tid(stlbe);
if (tid && (tid != pid))
continue;
kvmppc_44x_shadow_release(vcpu, i);
stlbe->word0 = 0;
}
up_write(&current->mm->mmap_sem);
}
/* Invalidate all mappings, so that when they fault back in they will get the
* proper permission bits. */
void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode)
{
int i;
/* XXX Replace loop with fancy data structures. */
down_write(&current->mm->mmap_sem);
for (i = 0; i <= tlb_44x_hwater; i++) {
kvmppc_44x_shadow_release(vcpu, i);
vcpu->arch.shadow_tlb[i].word0 = 0;
}
up_write(&current->mm->mmap_sem);
}

91
arch/powerpc/kvm/44x_tlb.h Normal file
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@ -0,0 +1,91 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#ifndef __KVM_POWERPC_TLB_H__
#define __KVM_POWERPC_TLB_H__
#include <linux/kvm_host.h>
#include <asm/mmu-44x.h>
extern int kvmppc_44x_tlb_index(struct kvm_vcpu *vcpu, gva_t eaddr,
unsigned int pid, unsigned int as);
extern struct tlbe *kvmppc_44x_dtlb_search(struct kvm_vcpu *vcpu, gva_t eaddr);
extern struct tlbe *kvmppc_44x_itlb_search(struct kvm_vcpu *vcpu, gva_t eaddr);
/* TLB helper functions */
static inline unsigned int get_tlb_size(const struct tlbe *tlbe)
{
return (tlbe->word0 >> 4) & 0xf;
}
static inline gva_t get_tlb_eaddr(const struct tlbe *tlbe)
{
return tlbe->word0 & 0xfffffc00;
}
static inline gva_t get_tlb_bytes(const struct tlbe *tlbe)
{
unsigned int pgsize = get_tlb_size(tlbe);
return 1 << 10 << (pgsize << 1);
}
static inline gva_t get_tlb_end(const struct tlbe *tlbe)
{
return get_tlb_eaddr(tlbe) + get_tlb_bytes(tlbe) - 1;
}
static inline u64 get_tlb_raddr(const struct tlbe *tlbe)
{
u64 word1 = tlbe->word1;
return ((word1 & 0xf) << 32) | (word1 & 0xfffffc00);
}
static inline unsigned int get_tlb_tid(const struct tlbe *tlbe)
{
return tlbe->tid & 0xff;
}
static inline unsigned int get_tlb_ts(const struct tlbe *tlbe)
{
return (tlbe->word0 >> 8) & 0x1;
}
static inline unsigned int get_tlb_v(const struct tlbe *tlbe)
{
return (tlbe->word0 >> 9) & 0x1;
}
static inline unsigned int get_mmucr_stid(const struct kvm_vcpu *vcpu)
{
return vcpu->arch.mmucr & 0xff;
}
static inline unsigned int get_mmucr_sts(const struct kvm_vcpu *vcpu)
{
return (vcpu->arch.mmucr >> 16) & 0x1;
}
static inline gpa_t tlb_xlate(struct tlbe *tlbe, gva_t eaddr)
{
unsigned int pgmask = get_tlb_bytes(tlbe) - 1;
return get_tlb_raddr(tlbe) | (eaddr & pgmask);
}
#endif /* __KVM_POWERPC_TLB_H__ */

42
arch/powerpc/kvm/Kconfig Normal file
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@ -0,0 +1,42 @@
#
# KVM configuration
#
menuconfig VIRTUALIZATION
bool "Virtualization"
---help---
Say Y here to get to see options for using your Linux host to run
other operating systems inside virtual machines (guests).
This option alone does not add any kernel code.
If you say N, all options in this submenu will be skipped and
disabled.
if VIRTUALIZATION
config KVM
bool "Kernel-based Virtual Machine (KVM) support"
depends on 44x && EXPERIMENTAL
select PREEMPT_NOTIFIERS
select ANON_INODES
# We can only run on Book E hosts so far
select KVM_BOOKE_HOST
---help---
Support hosting virtualized guest machines. You will also
need to select one or more of the processor modules below.
This module provides access to the hardware capabilities through
a character device node named /dev/kvm.
If unsure, say N.
config KVM_BOOKE_HOST
bool "KVM host support for Book E PowerPC processors"
depends on KVM && 44x
---help---
Provides host support for KVM on Book E PowerPC processors. Currently
this works on 440 processors only.
source drivers/virtio/Kconfig
endif # VIRTUALIZATION

15
arch/powerpc/kvm/Makefile Normal file
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@ -0,0 +1,15 @@
#
# Makefile for Kernel-based Virtual Machine module
#
EXTRA_CFLAGS += -Ivirt/kvm -Iarch/powerpc/kvm
common-objs = $(addprefix ../../../virt/kvm/, kvm_main.o)
kvm-objs := $(common-objs) powerpc.o emulate.o booke_guest.o
obj-$(CONFIG_KVM) += kvm.o
AFLAGS_booke_interrupts.o := -I$(obj)
kvm-booke-host-objs := booke_host.o booke_interrupts.o 44x_tlb.o
obj-$(CONFIG_KVM_BOOKE_HOST) += kvm-booke-host.o

615
arch/powerpc/kvm/booke_guest.c Normal file
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@ -0,0 +1,615 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <asm/cputable.h>
#include <asm/uaccess.h>
#include <asm/kvm_ppc.h>
#include "44x_tlb.h"
#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
struct kvm_stats_debugfs_item debugfs_entries[] = {
{ "exits", VCPU_STAT(sum_exits) },
{ "mmio", VCPU_STAT(mmio_exits) },
{ "dcr", VCPU_STAT(dcr_exits) },
{ "sig", VCPU_STAT(signal_exits) },
{ "light", VCPU_STAT(light_exits) },
{ "itlb_r", VCPU_STAT(itlb_real_miss_exits) },
{ "itlb_v", VCPU_STAT(itlb_virt_miss_exits) },
{ "dtlb_r", VCPU_STAT(dtlb_real_miss_exits) },
{ "dtlb_v", VCPU_STAT(dtlb_virt_miss_exits) },
{ "sysc", VCPU_STAT(syscall_exits) },
{ "isi", VCPU_STAT(isi_exits) },
{ "dsi", VCPU_STAT(dsi_exits) },
{ "inst_emu", VCPU_STAT(emulated_inst_exits) },
{ "dec", VCPU_STAT(dec_exits) },
{ "ext_intr", VCPU_STAT(ext_intr_exits) },
{ NULL }
};
static const u32 interrupt_msr_mask[16] = {
[BOOKE_INTERRUPT_CRITICAL] = MSR_ME,
[BOOKE_INTERRUPT_MACHINE_CHECK] = 0,
[BOOKE_INTERRUPT_DATA_STORAGE] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_INST_STORAGE] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_EXTERNAL] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_ALIGNMENT] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_PROGRAM] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_FP_UNAVAIL] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_SYSCALL] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_AP_UNAVAIL] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_DECREMENTER] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_FIT] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_WATCHDOG] = MSR_ME,
[BOOKE_INTERRUPT_DTLB_MISS] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_ITLB_MISS] = MSR_CE|MSR_ME|MSR_DE,
[BOOKE_INTERRUPT_DEBUG] = MSR_ME,
};
const unsigned char exception_priority[] = {
[BOOKE_INTERRUPT_DATA_STORAGE] = 0,
[BOOKE_INTERRUPT_INST_STORAGE] = 1,
[BOOKE_INTERRUPT_ALIGNMENT] = 2,
[BOOKE_INTERRUPT_PROGRAM] = 3,
[BOOKE_INTERRUPT_FP_UNAVAIL] = 4,
[BOOKE_INTERRUPT_SYSCALL] = 5,
[BOOKE_INTERRUPT_AP_UNAVAIL] = 6,
[BOOKE_INTERRUPT_DTLB_MISS] = 7,
[BOOKE_INTERRUPT_ITLB_MISS] = 8,
[BOOKE_INTERRUPT_MACHINE_CHECK] = 9,
[BOOKE_INTERRUPT_DEBUG] = 10,
[BOOKE_INTERRUPT_CRITICAL] = 11,
[BOOKE_INTERRUPT_WATCHDOG] = 12,
[BOOKE_INTERRUPT_EXTERNAL] = 13,
[BOOKE_INTERRUPT_FIT] = 14,
[BOOKE_INTERRUPT_DECREMENTER] = 15,
};
const unsigned char priority_exception[] = {
BOOKE_INTERRUPT_DATA_STORAGE,
BOOKE_INTERRUPT_INST_STORAGE,
BOOKE_INTERRUPT_ALIGNMENT,
BOOKE_INTERRUPT_PROGRAM,
BOOKE_INTERRUPT_FP_UNAVAIL,
BOOKE_INTERRUPT_SYSCALL,
BOOKE_INTERRUPT_AP_UNAVAIL,
BOOKE_INTERRUPT_DTLB_MISS,
BOOKE_INTERRUPT_ITLB_MISS,
BOOKE_INTERRUPT_MACHINE_CHECK,
BOOKE_INTERRUPT_DEBUG,
BOOKE_INTERRUPT_CRITICAL,
BOOKE_INTERRUPT_WATCHDOG,
BOOKE_INTERRUPT_EXTERNAL,
BOOKE_INTERRUPT_FIT,
BOOKE_INTERRUPT_DECREMENTER,
};
void kvmppc_dump_tlbs(struct kvm_vcpu *vcpu)
{
struct tlbe *tlbe;
int i;
printk("vcpu %d TLB dump:\n", vcpu->vcpu_id);
printk("| %2s | %3s | %8s | %8s | %8s |\n",
"nr", "tid", "word0", "word1", "word2");
for (i = 0; i < PPC44x_TLB_SIZE; i++) {
tlbe = &vcpu->arch.guest_tlb[i];
if (tlbe->word0 & PPC44x_TLB_VALID)
printk(" G%2d | %02X | %08X | %08X | %08X |\n",
i, tlbe->tid, tlbe->word0, tlbe->word1,
tlbe->word2);
}
for (i = 0; i < PPC44x_TLB_SIZE; i++) {
tlbe = &vcpu->arch.shadow_tlb[i];
if (tlbe->word0 & PPC44x_TLB_VALID)
printk(" S%2d | %02X | %08X | %08X | %08X |\n",
i, tlbe->tid, tlbe->word0, tlbe->word1,
tlbe->word2);
}
}
/* TODO: use vcpu_printf() */
void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu)
{
int i;
printk("pc: %08x msr: %08x\n", vcpu->arch.pc, vcpu->arch.msr);
printk("lr: %08x ctr: %08x\n", vcpu->arch.lr, vcpu->arch.ctr);
printk("srr0: %08x srr1: %08x\n", vcpu->arch.srr0, vcpu->arch.srr1);
printk("exceptions: %08lx\n", vcpu->arch.pending_exceptions);
for (i = 0; i < 32; i += 4) {
printk("gpr%02d: %08x %08x %08x %08x\n", i,
vcpu->arch.gpr[i],
vcpu->arch.gpr[i+1],
vcpu->arch.gpr[i+2],
vcpu->arch.gpr[i+3]);
}
}
/* Check if we are ready to deliver the interrupt */
static int kvmppc_can_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
{
int r;
switch (interrupt) {
case BOOKE_INTERRUPT_CRITICAL:
r = vcpu->arch.msr & MSR_CE;
break;
case BOOKE_INTERRUPT_MACHINE_CHECK:
r = vcpu->arch.msr & MSR_ME;
break;
case BOOKE_INTERRUPT_EXTERNAL:
r = vcpu->arch.msr & MSR_EE;
break;
case BOOKE_INTERRUPT_DECREMENTER:
r = vcpu->arch.msr & MSR_EE;
break;
case BOOKE_INTERRUPT_FIT:
r = vcpu->arch.msr & MSR_EE;
break;
case BOOKE_INTERRUPT_WATCHDOG:
r = vcpu->arch.msr & MSR_CE;
break;
case BOOKE_INTERRUPT_DEBUG:
r = vcpu->arch.msr & MSR_DE;
break;
default:
r = 1;
}
return r;
}
static void kvmppc_deliver_interrupt(struct kvm_vcpu *vcpu, int interrupt)
{
switch (interrupt) {
case BOOKE_INTERRUPT_DECREMENTER:
vcpu->arch.tsr |= TSR_DIS;
break;
}
vcpu->arch.srr0 = vcpu->arch.pc;
vcpu->arch.srr1 = vcpu->arch.msr;
vcpu->arch.pc = vcpu->arch.ivpr | vcpu->arch.ivor[interrupt];
kvmppc_set_msr(vcpu, vcpu->arch.msr & interrupt_msr_mask[interrupt]);
}
/* Check pending exceptions and deliver one, if possible. */
void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu)
{
unsigned long *pending = &vcpu->arch.pending_exceptions;
unsigned int exception;
unsigned int priority;
priority = find_first_bit(pending, BITS_PER_BYTE * sizeof(*pending));
while (priority <= BOOKE_MAX_INTERRUPT) {
exception = priority_exception[priority];
if (kvmppc_can_deliver_interrupt(vcpu, exception)) {
kvmppc_clear_exception(vcpu, exception);
kvmppc_deliver_interrupt(vcpu, exception);
break;
}
priority = find_next_bit(pending,
BITS_PER_BYTE * sizeof(*pending),
priority + 1);
}
}
static int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
enum emulation_result er;
int r;
er = kvmppc_emulate_instruction(run, vcpu);
switch (er) {
case EMULATE_DONE:
/* Future optimization: only reload non-volatiles if they were
* actually modified. */
r = RESUME_GUEST_NV;
break;
case EMULATE_DO_MMIO:
run->exit_reason = KVM_EXIT_MMIO;
/* We must reload nonvolatiles because "update" load/store
* instructions modify register state. */
/* Future optimization: only reload non-volatiles if they were
* actually modified. */
r = RESUME_HOST_NV;
break;
case EMULATE_FAIL:
/* XXX Deliver Program interrupt to guest. */
printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
vcpu->arch.last_inst);
r = RESUME_HOST;
break;
default:
BUG();
}
return r;
}
/**
* kvmppc_handle_exit
*
* Return value is in the form (errcode<<2 | RESUME_FLAG_HOST | RESUME_FLAG_NV)
*/
int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int exit_nr)
{
enum emulation_result er;
int r = RESUME_HOST;
local_irq_enable();
run->exit_reason = KVM_EXIT_UNKNOWN;
run->ready_for_interrupt_injection = 1;
switch (exit_nr) {
case BOOKE_INTERRUPT_MACHINE_CHECK:
printk("MACHINE CHECK: %lx\n", mfspr(SPRN_MCSR));
kvmppc_dump_vcpu(vcpu);
r = RESUME_HOST;
break;
case BOOKE_INTERRUPT_EXTERNAL:
case BOOKE_INTERRUPT_DECREMENTER:
/* Since we switched IVPR back to the host's value, the host
* handled this interrupt the moment we enabled interrupts.
* Now we just offer it a chance to reschedule the guest. */
/* XXX At this point the TLB still holds our shadow TLB, so if
* we do reschedule the host will fault over it. Perhaps we
* should politely restore the host's entries to minimize
* misses before ceding control. */
if (need_resched())
cond_resched();
if (exit_nr == BOOKE_INTERRUPT_DECREMENTER)
vcpu->stat.dec_exits++;
else
vcpu->stat.ext_intr_exits++;
r = RESUME_GUEST;
break;
case BOOKE_INTERRUPT_PROGRAM:
if (vcpu->arch.msr & MSR_PR) {
/* Program traps generated by user-level software must be handled
* by the guest kernel. */
vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
r = RESUME_GUEST;
break;
}
er = kvmppc_emulate_instruction(run, vcpu);
switch (er) {
case EMULATE_DONE:
/* Future optimization: only reload non-volatiles if
* they were actually modified by emulation. */
vcpu->stat.emulated_inst_exits++;
r = RESUME_GUEST_NV;
break;
case EMULATE_DO_DCR:
run->exit_reason = KVM_EXIT_DCR;
r = RESUME_HOST;
break;
case EMULATE_FAIL:
/* XXX Deliver Program interrupt to guest. */
printk(KERN_CRIT "%s: emulation at %x failed (%08x)\n",
__func__, vcpu->arch.pc, vcpu->arch.last_inst);
/* For debugging, encode the failing instruction and
* report it to userspace. */
run->hw.hardware_exit_reason = ~0ULL << 32;
run->hw.hardware_exit_reason |= vcpu->arch.last_inst;
r = RESUME_HOST;
break;
default:
BUG();
}
break;
case BOOKE_INTERRUPT_DATA_STORAGE:
vcpu->arch.dear = vcpu->arch.fault_dear;
vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_queue_exception(vcpu, exit_nr);
vcpu->stat.dsi_exits++;
r = RESUME_GUEST;
break;
case BOOKE_INTERRUPT_INST_STORAGE:
vcpu->arch.esr = vcpu->arch.fault_esr;
kvmppc_queue_exception(vcpu, exit_nr);
vcpu->stat.isi_exits++;
r = RESUME_GUEST;
break;
case BOOKE_INTERRUPT_SYSCALL:
kvmppc_queue_exception(vcpu, exit_nr);
vcpu->stat.syscall_exits++;
r = RESUME_GUEST;
break;
case BOOKE_INTERRUPT_DTLB_MISS: {
struct tlbe *gtlbe;
unsigned long eaddr = vcpu->arch.fault_dear;
gfn_t gfn;
/* Check the guest TLB. */
gtlbe = kvmppc_44x_dtlb_search(vcpu, eaddr);
if (!gtlbe) {
/* The guest didn't have a mapping for it. */
kvmppc_queue_exception(vcpu, exit_nr);
vcpu->arch.dear = vcpu->arch.fault_dear;
vcpu->arch.esr = vcpu->arch.fault_esr;
vcpu->stat.dtlb_real_miss_exits++;
r = RESUME_GUEST;
break;
}
vcpu->arch.paddr_accessed = tlb_xlate(gtlbe, eaddr);
gfn = vcpu->arch.paddr_accessed >> PAGE_SHIFT;
if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
/* The guest TLB had a mapping, but the shadow TLB
* didn't, and it is RAM. This could be because:
* a) the entry is mapping the host kernel, or
* b) the guest used a large mapping which we're faking
* Either way, we need to satisfy the fault without
* invoking the guest. */
kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
gtlbe->word2);
vcpu->stat.dtlb_virt_miss_exits++;
r = RESUME_GUEST;
} else {
/* Guest has mapped and accessed a page which is not
* actually RAM. */
r = kvmppc_emulate_mmio(run, vcpu);
}
break;
}
case BOOKE_INTERRUPT_ITLB_MISS: {
struct tlbe *gtlbe;
unsigned long eaddr = vcpu->arch.pc;
gfn_t gfn;
r = RESUME_GUEST;
/* Check the guest TLB. */
gtlbe = kvmppc_44x_itlb_search(vcpu, eaddr);
if (!gtlbe) {
/* The guest didn't have a mapping for it. */
kvmppc_queue_exception(vcpu, exit_nr);
vcpu->stat.itlb_real_miss_exits++;
break;
}
vcpu->stat.itlb_virt_miss_exits++;
gfn = tlb_xlate(gtlbe, eaddr) >> PAGE_SHIFT;
if (kvm_is_visible_gfn(vcpu->kvm, gfn)) {
/* The guest TLB had a mapping, but the shadow TLB
* didn't. This could be because:
* a) the entry is mapping the host kernel, or
* b) the guest used a large mapping which we're faking
* Either way, we need to satisfy the fault without
* invoking the guest. */
kvmppc_mmu_map(vcpu, eaddr, gfn, gtlbe->tid,
gtlbe->word2);
} else {
/* Guest mapped and leaped at non-RAM! */
kvmppc_queue_exception(vcpu,
BOOKE_INTERRUPT_MACHINE_CHECK);
}
break;
}
default:
printk(KERN_EMERG "exit_nr %d\n", exit_nr);
BUG();
}
local_irq_disable();
kvmppc_check_and_deliver_interrupts(vcpu);
/* Do some exit accounting. */
vcpu->stat.sum_exits++;
if (!(r & RESUME_HOST)) {
/* To avoid clobbering exit_reason, only check for signals if
* we aren't already exiting to userspace for some other
* reason. */
if (signal_pending(current)) {
run->exit_reason = KVM_EXIT_INTR;
r = (-EINTR << 2) | RESUME_HOST | (r & RESUME_FLAG_NV);
vcpu->stat.signal_exits++;
} else {
vcpu->stat.light_exits++;
}
} else {
switch (run->exit_reason) {
case KVM_EXIT_MMIO:
vcpu->stat.mmio_exits++;
break;
case KVM_EXIT_DCR:
vcpu->stat.dcr_exits++;
break;
case KVM_EXIT_INTR:
vcpu->stat.signal_exits++;
break;
}
}
return r;
}
/* Initial guest state: 16MB mapping 0 -> 0, PC = 0, MSR = 0, R1 = 16MB */
int kvm_arch_vcpu_setup(struct kvm_vcpu *vcpu)
{
struct tlbe *tlbe = &vcpu->arch.guest_tlb[0];
tlbe->tid = 0;
tlbe->word0 = PPC44x_TLB_16M | PPC44x_TLB_VALID;
tlbe->word1 = 0;
tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR;
tlbe++;
tlbe->tid = 0;
tlbe->word0 = 0xef600000 | PPC44x_TLB_4K | PPC44x_TLB_VALID;
tlbe->word1 = 0xef600000;
tlbe->word2 = PPC44x_TLB_SX | PPC44x_TLB_SW | PPC44x_TLB_SR
| PPC44x_TLB_I | PPC44x_TLB_G;
vcpu->arch.pc = 0;
vcpu->arch.msr = 0;
vcpu->arch.gpr[1] = (16<<20) - 8; /* -8 for the callee-save LR slot */
/* Eye-catching number so we know if the guest takes an interrupt
* before it's programmed its own IVPR. */
vcpu->arch.ivpr = 0x55550000;
/* Since the guest can directly access the timebase, it must know the
* real timebase frequency. Accordingly, it must see the state of
* CCR1[TCS]. */
vcpu->arch.ccr1 = mfspr(SPRN_CCR1);
return 0;
}
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
int i;
regs->pc = vcpu->arch.pc;
regs->cr = vcpu->arch.cr;
regs->ctr = vcpu->arch.ctr;
regs->lr = vcpu->arch.lr;
regs->xer = vcpu->arch.xer;
regs->msr = vcpu->arch.msr;
regs->srr0 = vcpu->arch.srr0;
regs->srr1 = vcpu->arch.srr1;
regs->pid = vcpu->arch.pid;
regs->sprg0 = vcpu->arch.sprg0;
regs->sprg1 = vcpu->arch.sprg1;
regs->sprg2 = vcpu->arch.sprg2;
regs->sprg3 = vcpu->arch.sprg3;
regs->sprg5 = vcpu->arch.sprg4;
regs->sprg6 = vcpu->arch.sprg5;
regs->sprg7 = vcpu->arch.sprg6;
for (i = 0; i < ARRAY_SIZE(regs->gpr); i++)
regs->gpr[i] = vcpu->arch.gpr[i];
return 0;
}
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
{
int i;
vcpu->arch.pc = regs->pc;
vcpu->arch.cr = regs->cr;
vcpu->arch.ctr = regs->ctr;
vcpu->arch.lr = regs->lr;
vcpu->arch.xer = regs->xer;
vcpu->arch.msr = regs->msr;
vcpu->arch.srr0 = regs->srr0;
vcpu->arch.srr1 = regs->srr1;
vcpu->arch.sprg0 = regs->sprg0;
vcpu->arch.sprg1 = regs->sprg1;
vcpu->arch.sprg2 = regs->sprg2;
vcpu->arch.sprg3 = regs->sprg3;
vcpu->arch.sprg5 = regs->sprg4;
vcpu->arch.sprg6 = regs->sprg5;
vcpu->arch.sprg7 = regs->sprg6;
for (i = 0; i < ARRAY_SIZE(vcpu->arch.gpr); i++)
vcpu->arch.gpr[i] = regs->gpr[i];
return 0;
}
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
return -ENOTSUPP;
}
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
struct kvm_sregs *sregs)
{
return -ENOTSUPP;
}
int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
}
int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
{
return -ENOTSUPP;
}
/* 'linear_address' is actually an encoding of AS|PID|EADDR . */
int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
struct kvm_translation *tr)
{
struct tlbe *gtlbe;
int index;
gva_t eaddr;
u8 pid;
u8 as;
eaddr = tr->linear_address;
pid = (tr->linear_address >> 32) & 0xff;
as = (tr->linear_address >> 40) & 0x1;
index = kvmppc_44x_tlb_index(vcpu, eaddr, pid, as);
if (index == -1) {
tr->valid = 0;
return 0;
}
gtlbe = &vcpu->arch.guest_tlb[index];
tr->physical_address = tlb_xlate(gtlbe, eaddr);
/* XXX what does "writeable" and "usermode" even mean? */
tr->valid = 1;
return 0;
}

83
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2008
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <linux/errno.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <asm/cacheflush.h>
#include <asm/kvm_ppc.h>
unsigned long kvmppc_booke_handlers;
static int kvmppc_booke_init(void)
{
unsigned long ivor[16];
unsigned long max_ivor = 0;
int i;
/* We install our own exception handlers by hijacking IVPR. IVPR must
* be 16-bit aligned, so we need a 64KB allocation. */
kvmppc_booke_handlers = __get_free_pages(GFP_KERNEL | __GFP_ZERO,
VCPU_SIZE_ORDER);
if (!kvmppc_booke_handlers)
return -ENOMEM;
/* XXX make sure our handlers are smaller than Linux's */
/* Copy our interrupt handlers to match host IVORs. That way we don't
* have to swap the IVORs on every guest/host transition. */
ivor[0] = mfspr(SPRN_IVOR0);
ivor[1] = mfspr(SPRN_IVOR1);
ivor[2] = mfspr(SPRN_IVOR2);
ivor[3] = mfspr(SPRN_IVOR3);
ivor[4] = mfspr(SPRN_IVOR4);
ivor[5] = mfspr(SPRN_IVOR5);
ivor[6] = mfspr(SPRN_IVOR6);
ivor[7] = mfspr(SPRN_IVOR7);
ivor[8] = mfspr(SPRN_IVOR8);
ivor[9] = mfspr(SPRN_IVOR9);
ivor[10] = mfspr(SPRN_IVOR10);
ivor[11] = mfspr(SPRN_IVOR11);
ivor[12] = mfspr(SPRN_IVOR12);
ivor[13] = mfspr(SPRN_IVOR13);
ivor[14] = mfspr(SPRN_IVOR14);
ivor[15] = mfspr(SPRN_IVOR15);
for (i = 0; i < 16; i++) {
if (ivor[i] > max_ivor)
max_ivor = ivor[i];
memcpy((void *)kvmppc_booke_handlers + ivor[i],
kvmppc_handlers_start + i * kvmppc_handler_len,
kvmppc_handler_len);
}
flush_icache_range(kvmppc_booke_handlers,
kvmppc_booke_handlers + max_ivor + kvmppc_handler_len);
return kvm_init(NULL, sizeof(struct kvm_vcpu), THIS_MODULE);
}
static void __exit kvmppc_booke_exit(void)
{
free_pages(kvmppc_booke_handlers, VCPU_SIZE_ORDER);
kvm_exit();
}
module_init(kvmppc_booke_init)
module_exit(kvmppc_booke_exit)

436
arch/powerpc/kvm/booke_interrupts.S Normal file
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/mmu-44x.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
#define KVMPPC_MSR_MASK (MSR_CE|MSR_EE|MSR_PR|MSR_DE|MSR_ME|MSR_IS|MSR_DS)
#define VCPU_GPR(n) (VCPU_GPRS + (n * 4))
/* The host stack layout: */
#define HOST_R1 0 /* Implied by stwu. */
#define HOST_CALLEE_LR 4
#define HOST_RUN 8
/* r2 is special: it holds 'current', and it made nonvolatile in the
* kernel with the -ffixed-r2 gcc option. */
#define HOST_R2 12
#define HOST_NV_GPRS 16
#define HOST_NV_GPR(n) (HOST_NV_GPRS + ((n - 14) * 4))
#define HOST_MIN_STACK_SIZE (HOST_NV_GPR(31) + 4)
#define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */
#define HOST_STACK_LR (HOST_STACK_SIZE + 4) /* In caller stack frame. */
#define NEED_INST_MASK ((1<<BOOKE_INTERRUPT_PROGRAM) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS))
#define NEED_DEAR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS))
#define NEED_ESR_MASK ((1<<BOOKE_INTERRUPT_DATA_STORAGE) | \
(1<<BOOKE_INTERRUPT_INST_STORAGE) | \
(1<<BOOKE_INTERRUPT_PROGRAM) | \
(1<<BOOKE_INTERRUPT_DTLB_MISS))
.macro KVM_HANDLER ivor_nr
_GLOBAL(kvmppc_handler_\ivor_nr)
/* Get pointer to vcpu and record exit number. */
mtspr SPRN_SPRG0, r4
mfspr r4, SPRN_SPRG1
stw r5, VCPU_GPR(r5)(r4)
stw r6, VCPU_GPR(r6)(r4)
mfctr r5
lis r6, kvmppc_resume_host@h
stw r5, VCPU_CTR(r4)
li r5, \ivor_nr
ori r6, r6, kvmppc_resume_host@l
mtctr r6
bctr
.endm
_GLOBAL(kvmppc_handlers_start)
KVM_HANDLER BOOKE_INTERRUPT_CRITICAL
KVM_HANDLER BOOKE_INTERRUPT_MACHINE_CHECK
KVM_HANDLER BOOKE_INTERRUPT_DATA_STORAGE
KVM_HANDLER BOOKE_INTERRUPT_INST_STORAGE
KVM_HANDLER BOOKE_INTERRUPT_EXTERNAL
KVM_HANDLER BOOKE_INTERRUPT_ALIGNMENT
KVM_HANDLER BOOKE_INTERRUPT_PROGRAM
KVM_HANDLER BOOKE_INTERRUPT_FP_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_SYSCALL
KVM_HANDLER BOOKE_INTERRUPT_AP_UNAVAIL
KVM_HANDLER BOOKE_INTERRUPT_DECREMENTER
KVM_HANDLER BOOKE_INTERRUPT_FIT
KVM_HANDLER BOOKE_INTERRUPT_WATCHDOG
KVM_HANDLER BOOKE_INTERRUPT_DTLB_MISS
KVM_HANDLER BOOKE_INTERRUPT_ITLB_MISS
KVM_HANDLER BOOKE_INTERRUPT_DEBUG
_GLOBAL(kvmppc_handler_len)
.long kvmppc_handler_1 - kvmppc_handler_0
/* Registers:
* SPRG0: guest r4
* r4: vcpu pointer
* r5: KVM exit number
*/
_GLOBAL(kvmppc_resume_host)
stw r3, VCPU_GPR(r3)(r4)
mfcr r3
stw r3, VCPU_CR(r4)
stw r7, VCPU_GPR(r7)(r4)
stw r8, VCPU_GPR(r8)(r4)
stw r9, VCPU_GPR(r9)(r4)
li r6, 1
slw r6, r6, r5
/* Save the faulting instruction and all GPRs for emulation. */
andi. r7, r6, NEED_INST_MASK
beq ..skip_inst_copy
mfspr r9, SPRN_SRR0
mfmsr r8
ori r7, r8, MSR_DS
mtmsr r7
isync
lwz r9, 0(r9)
mtmsr r8
isync
stw r9, VCPU_LAST_INST(r4)
stw r15, VCPU_GPR(r15)(r4)
stw r16, VCPU_GPR(r16)(r4)
stw r17, VCPU_GPR(r17)(r4)
stw r18, VCPU_GPR(r18)(r4)
stw r19, VCPU_GPR(r19)(r4)
stw r20, VCPU_GPR(r20)(r4)
stw r21, VCPU_GPR(r21)(r4)
stw r22, VCPU_GPR(r22)(r4)
stw r23, VCPU_GPR(r23)(r4)
stw r24, VCPU_GPR(r24)(r4)
stw r25, VCPU_GPR(r25)(r4)
stw r26, VCPU_GPR(r26)(r4)
stw r27, VCPU_GPR(r27)(r4)
stw r28, VCPU_GPR(r28)(r4)
stw r29, VCPU_GPR(r29)(r4)
stw r30, VCPU_GPR(r30)(r4)
stw r31, VCPU_GPR(r31)(r4)
..skip_inst_copy:
/* Also grab DEAR and ESR before the host can clobber them. */
andi. r7, r6, NEED_DEAR_MASK
beq ..skip_dear
mfspr r9, SPRN_DEAR
stw r9, VCPU_FAULT_DEAR(r4)
..skip_dear:
andi. r7, r6, NEED_ESR_MASK
beq ..skip_esr
mfspr r9, SPRN_ESR
stw r9, VCPU_FAULT_ESR(r4)
..skip_esr:
/* Save remaining volatile guest register state to vcpu. */
stw r0, VCPU_GPR(r0)(r4)
stw r1, VCPU_GPR(r1)(r4)
stw r2, VCPU_GPR(r2)(r4)
stw r10, VCPU_GPR(r10)(r4)
stw r11, VCPU_GPR(r11)(r4)
stw r12, VCPU_GPR(r12)(r4)
stw r13, VCPU_GPR(r13)(r4)
stw r14, VCPU_GPR(r14)(r4) /* We need a NV GPR below. */
mflr r3
stw r3, VCPU_LR(r4)
mfxer r3
stw r3, VCPU_XER(r4)
mfspr r3, SPRN_SPRG0
stw r3, VCPU_GPR(r4)(r4)
mfspr r3, SPRN_SRR0
stw r3, VCPU_PC(r4)
/* Restore host stack pointer and PID before IVPR, since the host
* exception handlers use them. */
lwz r1, VCPU_HOST_STACK(r4)
lwz r3, VCPU_HOST_PID(r4)
mtspr SPRN_PID, r3
/* Restore host IVPR before re-enabling interrupts. We cheat and know
* that Linux IVPR is always 0xc0000000. */
lis r3, 0xc000
mtspr SPRN_IVPR, r3
/* Switch to kernel stack and jump to handler. */
LOAD_REG_ADDR(r3, kvmppc_handle_exit)
mtctr r3
lwz r3, HOST_RUN(r1)
lwz r2, HOST_R2(r1)
mr r14, r4 /* Save vcpu pointer. */
bctrl /* kvmppc_handle_exit() */
/* Restore vcpu pointer and the nonvolatiles we used. */
mr r4, r14
lwz r14, VCPU_GPR(r14)(r4)
/* Sometimes instruction emulation must restore complete GPR state. */
andi. r5, r3, RESUME_FLAG_NV
beq ..skip_nv_load
lwz r15, VCPU_GPR(r15)(r4)
lwz r16, VCPU_GPR(r16)(r4)
lwz r17, VCPU_GPR(r17)(r4)
lwz r18, VCPU_GPR(r18)(r4)
lwz r19, VCPU_GPR(r19)(r4)
lwz r20, VCPU_GPR(r20)(r4)
lwz r21, VCPU_GPR(r21)(r4)
lwz r22, VCPU_GPR(r22)(r4)
lwz r23, VCPU_GPR(r23)(r4)
lwz r24, VCPU_GPR(r24)(r4)
lwz r25, VCPU_GPR(r25)(r4)
lwz r26, VCPU_GPR(r26)(r4)
lwz r27, VCPU_GPR(r27)(r4)
lwz r28, VCPU_GPR(r28)(r4)
lwz r29, VCPU_GPR(r29)(r4)
lwz r30, VCPU_GPR(r30)(r4)
lwz r31, VCPU_GPR(r31)(r4)
..skip_nv_load:
/* Should we return to the guest? */
andi. r5, r3, RESUME_FLAG_HOST
beq lightweight_exit
srawi r3, r3, 2 /* Shift -ERR back down. */
heavyweight_exit:
/* Not returning to guest. */
/* We already saved guest volatile register state; now save the
* non-volatiles. */
stw r15, VCPU_GPR(r15)(r4)
stw r16, VCPU_GPR(r16)(r4)
stw r17, VCPU_GPR(r17)(r4)
stw r18, VCPU_GPR(r18)(r4)
stw r19, VCPU_GPR(r19)(r4)
stw r20, VCPU_GPR(r20)(r4)
stw r21, VCPU_GPR(r21)(r4)
stw r22, VCPU_GPR(r22)(r4)
stw r23, VCPU_GPR(r23)(r4)
stw r24, VCPU_GPR(r24)(r4)
stw r25, VCPU_GPR(r25)(r4)
stw r26, VCPU_GPR(r26)(r4)
stw r27, VCPU_GPR(r27)(r4)
stw r28, VCPU_GPR(r28)(r4)
stw r29, VCPU_GPR(r29)(r4)
stw r30, VCPU_GPR(r30)(r4)
stw r31, VCPU_GPR(r31)(r4)
/* Load host non-volatile register state from host stack. */
lwz r14, HOST_NV_GPR(r14)(r1)
lwz r15, HOST_NV_GPR(r15)(r1)
lwz r16, HOST_NV_GPR(r16)(r1)
lwz r17, HOST_NV_GPR(r17)(r1)
lwz r18, HOST_NV_GPR(r18)(r1)
lwz r19, HOST_NV_GPR(r19)(r1)
lwz r20, HOST_NV_GPR(r20)(r1)
lwz r21, HOST_NV_GPR(r21)(r1)
lwz r22, HOST_NV_GPR(r22)(r1)
lwz r23, HOST_NV_GPR(r23)(r1)
lwz r24, HOST_NV_GPR(r24)(r1)
lwz r25, HOST_NV_GPR(r25)(r1)
lwz r26, HOST_NV_GPR(r26)(r1)
lwz r27, HOST_NV_GPR(r27)(r1)
lwz r28, HOST_NV_GPR(r28)(r1)
lwz r29, HOST_NV_GPR(r29)(r1)
lwz r30, HOST_NV_GPR(r30)(r1)
lwz r31, HOST_NV_GPR(r31)(r1)
/* Return to kvm_vcpu_run(). */
lwz r4, HOST_STACK_LR(r1)
addi r1, r1, HOST_STACK_SIZE
mtlr r4
/* r3 still contains the return code from kvmppc_handle_exit(). */
blr
/* Registers:
* r3: kvm_run pointer
* r4: vcpu pointer
*/
_GLOBAL(__kvmppc_vcpu_run)
stwu r1, -HOST_STACK_SIZE(r1)
stw r1, VCPU_HOST_STACK(r4) /* Save stack pointer to vcpu. */
/* Save host state to stack. */
stw r3, HOST_RUN(r1)
mflr r3
stw r3, HOST_STACK_LR(r1)
/* Save host non-volatile register state to stack. */
stw r14, HOST_NV_GPR(r14)(r1)
stw r15, HOST_NV_GPR(r15)(r1)
stw r16, HOST_NV_GPR(r16)(r1)
stw r17, HOST_NV_GPR(r17)(r1)
stw r18, HOST_NV_GPR(r18)(r1)
stw r19, HOST_NV_GPR(r19)(r1)
stw r20, HOST_NV_GPR(r20)(r1)
stw r21, HOST_NV_GPR(r21)(r1)
stw r22, HOST_NV_GPR(r22)(r1)
stw r23, HOST_NV_GPR(r23)(r1)
stw r24, HOST_NV_GPR(r24)(r1)
stw r25, HOST_NV_GPR(r25)(r1)
stw r26, HOST_NV_GPR(r26)(r1)
stw r27, HOST_NV_GPR(r27)(r1)
stw r28, HOST_NV_GPR(r28)(r1)
stw r29, HOST_NV_GPR(r29)(r1)
stw r30, HOST_NV_GPR(r30)(r1)
stw r31, HOST_NV_GPR(r31)(r1)
/* Load guest non-volatiles. */
lwz r14, VCPU_GPR(r14)(r4)
lwz r15, VCPU_GPR(r15)(r4)
lwz r16, VCPU_GPR(r16)(r4)
lwz r17, VCPU_GPR(r17)(r4)
lwz r18, VCPU_GPR(r18)(r4)
lwz r19, VCPU_GPR(r19)(r4)
lwz r20, VCPU_GPR(r20)(r4)
lwz r21, VCPU_GPR(r21)(r4)
lwz r22, VCPU_GPR(r22)(r4)
lwz r23, VCPU_GPR(r23)(r4)
lwz r24, VCPU_GPR(r24)(r4)
lwz r25, VCPU_GPR(r25)(r4)
lwz r26, VCPU_GPR(r26)(r4)
lwz r27, VCPU_GPR(r27)(r4)
lwz r28, VCPU_GPR(r28)(r4)
lwz r29, VCPU_GPR(r29)(r4)
lwz r30, VCPU_GPR(r30)(r4)
lwz r31, VCPU_GPR(r31)(r4)
lightweight_exit:
stw r2, HOST_R2(r1)
mfspr r3, SPRN_PID
stw r3, VCPU_HOST_PID(r4)
lwz r3, VCPU_PID(r4)
mtspr SPRN_PID, r3
/* Prevent all TLB updates. */
mfmsr r5
lis r6, (MSR_EE|MSR_CE|MSR_ME|MSR_DE)@h
ori r6, r6, (MSR_EE|MSR_CE|MSR_ME|MSR_DE)@l
andc r6, r5, r6
mtmsr r6
/* Save the host's non-pinned TLB mappings, and load the guest mappings
* over them. Leave the host's "pinned" kernel mappings in place. */
/* XXX optimization: use generation count to avoid swapping unmodified
* entries. */
mfspr r10, SPRN_MMUCR /* Save host MMUCR. */
lis r8, tlb_44x_hwater@ha
lwz r8, tlb_44x_hwater@l(r8)
addi r3, r4, VCPU_HOST_TLB - 4
addi r9, r4, VCPU_SHADOW_TLB - 4
li r6, 0
1:
/* Save host entry. */
tlbre r7, r6, PPC44x_TLB_PAGEID
mfspr r5, SPRN_MMUCR
stwu r5, 4(r3)
stwu r7, 4(r3)
tlbre r7, r6, PPC44x_TLB_XLAT
stwu r7, 4(r3)
tlbre r7, r6, PPC44x_TLB_ATTRIB
stwu r7, 4(r3)
/* Load guest entry. */
lwzu r7, 4(r9)
mtspr SPRN_MMUCR, r7
lwzu r7, 4(r9)
tlbwe r7, r6, PPC44x_TLB_PAGEID
lwzu r7, 4(r9)
tlbwe r7, r6, PPC44x_TLB_XLAT
lwzu r7, 4(r9)
tlbwe r7, r6, PPC44x_TLB_ATTRIB
/* Increment index. */
addi r6, r6, 1
cmpw r6, r8
blt 1b
mtspr SPRN_MMUCR, r10 /* Restore host MMUCR. */
iccci 0, 0 /* XXX hack */
/* Load some guest volatiles. */
lwz r0, VCPU_GPR(r0)(r4)
lwz r2, VCPU_GPR(r2)(r4)
lwz r9, VCPU_GPR(r9)(r4)
lwz r10, VCPU_GPR(r10)(r4)
lwz r11, VCPU_GPR(r11)(r4)
lwz r12, VCPU_GPR(r12)(r4)
lwz r13, VCPU_GPR(r13)(r4)
lwz r3, VCPU_LR(r4)
mtlr r3
lwz r3, VCPU_XER(r4)
mtxer r3
/* Switch the IVPR. XXX If we take a TLB miss after this we're screwed,
* so how do we make sure vcpu won't fault? */
lis r8, kvmppc_booke_handlers@ha
lwz r8, kvmppc_booke_handlers@l(r8)
mtspr SPRN_IVPR, r8
/* Save vcpu pointer for the exception handlers. */
mtspr SPRN_SPRG1, r4
/* Can't switch the stack pointer until after IVPR is switched,
* because host interrupt handlers would get confused. */
lwz r1, VCPU_GPR(r1)(r4)
/* XXX handle USPRG0 */
/* Host interrupt handlers may have clobbered these guest-readable
* SPRGs, so we need to reload them here with the guest's values. */
lwz r3, VCPU_SPRG4(r4)
mtspr SPRN_SPRG4, r3
lwz r3, VCPU_SPRG5(r4)
mtspr SPRN_SPRG5, r3
lwz r3, VCPU_SPRG6(r4)
mtspr SPRN_SPRG6, r3
lwz r3, VCPU_SPRG7(r4)
mtspr SPRN_SPRG7, r3
/* Finish loading guest volatiles and jump to guest. */
lwz r3, VCPU_CTR(r4)
mtctr r3
lwz r3, VCPU_CR(r4)
mtcr r3
lwz r5, VCPU_GPR(r5)(r4)
lwz r6, VCPU_GPR(r6)(r4)
lwz r7, VCPU_GPR(r7)(r4)
lwz r8, VCPU_GPR(r8)(r4)
lwz r3, VCPU_PC(r4)
mtsrr0 r3
lwz r3, VCPU_MSR(r4)
oris r3, r3, KVMPPC_MSR_MASK@h
ori r3, r3, KVMPPC_MSR_MASK@l
mtsrr1 r3
lwz r3, VCPU_GPR(r3)(r4)
lwz r4, VCPU_GPR(r4)(r4)
rfi

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arch/powerpc/kvm/emulate.c Normal file
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@ -0,0 +1,760 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#include <linux/jiffies.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/string.h>
#include <linux/kvm_host.h>
#include <asm/dcr.h>
#include <asm/dcr-regs.h>
#include <asm/time.h>
#include <asm/byteorder.h>
#include <asm/kvm_ppc.h>
#include "44x_tlb.h"
/* Instruction decoding */
static inline unsigned int get_op(u32 inst)
{
return inst >> 26;
}
static inline unsigned int get_xop(u32 inst)
{
return (inst >> 1) & 0x3ff;
}
static inline unsigned int get_sprn(u32 inst)
{
return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0);
}
static inline unsigned int get_dcrn(u32 inst)
{
return ((inst >> 16) & 0x1f) | ((inst >> 6) & 0x3e0);
}
static inline unsigned int get_rt(u32 inst)
{
return (inst >> 21) & 0x1f;
}
static inline unsigned int get_rs(u32 inst)
{
return (inst >> 21) & 0x1f;
}
static inline unsigned int get_ra(u32 inst)
{
return (inst >> 16) & 0x1f;
}
static inline unsigned int get_rb(u32 inst)
{
return (inst >> 11) & 0x1f;
}
static inline unsigned int get_rc(u32 inst)
{
return inst & 0x1;
}
static inline unsigned int get_ws(u32 inst)
{
return (inst >> 11) & 0x1f;
}
static inline unsigned int get_d(u32 inst)
{
return inst & 0xffff;
}
static int tlbe_is_host_safe(const struct kvm_vcpu *vcpu,
const struct tlbe *tlbe)
{
gpa_t gpa;
if (!get_tlb_v(tlbe))
return 0;
/* Does it match current guest AS? */
/* XXX what about IS != DS? */
if (get_tlb_ts(tlbe) != !!(vcpu->arch.msr & MSR_IS))
return 0;
gpa = get_tlb_raddr(tlbe);
if (!gfn_to_memslot(vcpu->kvm, gpa >> PAGE_SHIFT))
/* Mapping is not for RAM. */
return 0;
return 1;
}
static int kvmppc_emul_tlbwe(struct kvm_vcpu *vcpu, u32 inst)
{
u64 eaddr;
u64 raddr;
u64 asid;
u32 flags;
struct tlbe *tlbe;
unsigned int ra;
unsigned int rs;
unsigned int ws;
unsigned int index;
ra = get_ra(inst);
rs = get_rs(inst);
ws = get_ws(inst);
index = vcpu->arch.gpr[ra];
if (index > PPC44x_TLB_SIZE) {
printk("%s: index %d\n", __func__, index);
kvmppc_dump_vcpu(vcpu);
return EMULATE_FAIL;
}
tlbe = &vcpu->arch.guest_tlb[index];
/* Invalidate shadow mappings for the about-to-be-clobbered TLBE. */
if (tlbe->word0 & PPC44x_TLB_VALID) {
eaddr = get_tlb_eaddr(tlbe);
asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid;
kvmppc_mmu_invalidate(vcpu, eaddr, asid);
}
switch (ws) {
case PPC44x_TLB_PAGEID:
tlbe->tid = vcpu->arch.mmucr & 0xff;
tlbe->word0 = vcpu->arch.gpr[rs];
break;
case PPC44x_TLB_XLAT:
tlbe->word1 = vcpu->arch.gpr[rs];
break;
case PPC44x_TLB_ATTRIB:
tlbe->word2 = vcpu->arch.gpr[rs];
break;
default:
return EMULATE_FAIL;
}
if (tlbe_is_host_safe(vcpu, tlbe)) {
eaddr = get_tlb_eaddr(tlbe);
raddr = get_tlb_raddr(tlbe);
asid = (tlbe->word0 & PPC44x_TLB_TS) | tlbe->tid;
flags = tlbe->word2 & 0xffff;
/* Create a 4KB mapping on the host. If the guest wanted a
* large page, only the first 4KB is mapped here and the rest
* are mapped on the fly. */
kvmppc_mmu_map(vcpu, eaddr, raddr >> PAGE_SHIFT, asid, flags);
}
return EMULATE_DONE;
}
static void kvmppc_emulate_dec(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.tcr & TCR_DIE) {
/* The decrementer ticks at the same rate as the timebase, so
* that's how we convert the guest DEC value to the number of
* host ticks. */
unsigned long nr_jiffies;
nr_jiffies = vcpu->arch.dec / tb_ticks_per_jiffy;
mod_timer(&vcpu->arch.dec_timer,
get_jiffies_64() + nr_jiffies);
} else {
del_timer(&vcpu->arch.dec_timer);
}
}
static void kvmppc_emul_rfi(struct kvm_vcpu *vcpu)
{
vcpu->arch.pc = vcpu->arch.srr0;
kvmppc_set_msr(vcpu, vcpu->arch.srr1);
}
/* XXX to do:
* lhax
* lhaux
* lswx
* lswi
* stswx
* stswi
* lha
* lhau
* lmw
* stmw
*
* XXX is_bigendian should depend on MMU mapping or MSR[LE]
*/
int kvmppc_emulate_instruction(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
u32 inst = vcpu->arch.last_inst;
u32 ea;
int ra;
int rb;
int rc;
int rs;
int rt;
int sprn;
int dcrn;
enum emulation_result emulated = EMULATE_DONE;
int advance = 1;
switch (get_op(inst)) {
case 3: /* trap */
printk("trap!\n");
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_PROGRAM);
advance = 0;
break;
case 19:
switch (get_xop(inst)) {
case 50: /* rfi */
kvmppc_emul_rfi(vcpu);
advance = 0;
break;
default:
emulated = EMULATE_FAIL;
break;
}
break;
case 31:
switch (get_xop(inst)) {
case 83: /* mfmsr */
rt = get_rt(inst);
vcpu->arch.gpr[rt] = vcpu->arch.msr;
break;
case 87: /* lbzx */
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
break;
case 131: /* wrtee */
rs = get_rs(inst);
vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
| (vcpu->arch.gpr[rs] & MSR_EE);
break;
case 146: /* mtmsr */
rs = get_rs(inst);
kvmppc_set_msr(vcpu, vcpu->arch.gpr[rs]);
break;
case 163: /* wrteei */
vcpu->arch.msr = (vcpu->arch.msr & ~MSR_EE)
| (inst & MSR_EE);
break;
case 215: /* stbx */
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu,
vcpu->arch.gpr[rs],
1, 1);
break;
case 247: /* stbux */
rs = get_rs(inst);
ra = get_ra(inst);
rb = get_rb(inst);
ea = vcpu->arch.gpr[rb];
if (ra)
ea += vcpu->arch.gpr[ra];
emulated = kvmppc_handle_store(run, vcpu,
vcpu->arch.gpr[rs],
1, 1);
vcpu->arch.gpr[rs] = ea;
break;
case 279: /* lhzx */
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
break;
case 311: /* lhzux */
rt = get_rt(inst);
ra = get_ra(inst);
rb = get_rb(inst);
ea = vcpu->arch.gpr[rb];
if (ra)
ea += vcpu->arch.gpr[ra];
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
vcpu->arch.gpr[ra] = ea;
break;
case 323: /* mfdcr */
dcrn = get_dcrn(inst);
rt = get_rt(inst);
/* The guest may access CPR0 registers to determine the timebase
* frequency, and it must know the real host frequency because it
* can directly access the timebase registers.
*
* It would be possible to emulate those accesses in userspace,
* but userspace can really only figure out the end frequency.
* We could decompose that into the factors that compute it, but
* that's tricky math, and it's easier to just report the real
* CPR0 values.
*/
switch (dcrn) {
case DCRN_CPR0_CONFIG_ADDR:
vcpu->arch.gpr[rt] = vcpu->arch.cpr0_cfgaddr;
break;
case DCRN_CPR0_CONFIG_DATA:
local_irq_disable();
mtdcr(DCRN_CPR0_CONFIG_ADDR,
vcpu->arch.cpr0_cfgaddr);
vcpu->arch.gpr[rt] = mfdcr(DCRN_CPR0_CONFIG_DATA);
local_irq_enable();
break;
default:
run->dcr.dcrn = dcrn;
run->dcr.data = 0;
run->dcr.is_write = 0;
vcpu->arch.io_gpr = rt;
vcpu->arch.dcr_needed = 1;
emulated = EMULATE_DO_DCR;
}
break;
case 339: /* mfspr */
sprn = get_sprn(inst);
rt = get_rt(inst);
switch (sprn) {
case SPRN_SRR0:
vcpu->arch.gpr[rt] = vcpu->arch.srr0; break;
case SPRN_SRR1:
vcpu->arch.gpr[rt] = vcpu->arch.srr1; break;
case SPRN_MMUCR:
vcpu->arch.gpr[rt] = vcpu->arch.mmucr; break;
case SPRN_PID:
vcpu->arch.gpr[rt] = vcpu->arch.pid; break;
case SPRN_IVPR:
vcpu->arch.gpr[rt] = vcpu->arch.ivpr; break;
case SPRN_CCR0:
vcpu->arch.gpr[rt] = vcpu->arch.ccr0; break;
case SPRN_CCR1:
vcpu->arch.gpr[rt] = vcpu->arch.ccr1; break;
case SPRN_PVR:
vcpu->arch.gpr[rt] = vcpu->arch.pvr; break;
case SPRN_DEAR:
vcpu->arch.gpr[rt] = vcpu->arch.dear; break;
case SPRN_ESR:
vcpu->arch.gpr[rt] = vcpu->arch.esr; break;
case SPRN_DBCR0:
vcpu->arch.gpr[rt] = vcpu->arch.dbcr0; break;
case SPRN_DBCR1:
vcpu->arch.gpr[rt] = vcpu->arch.dbcr1; break;
/* Note: mftb and TBRL/TBWL are user-accessible, so
* the guest can always access the real TB anyways.
* In fact, we probably will never see these traps. */
case SPRN_TBWL:
vcpu->arch.gpr[rt] = mftbl(); break;
case SPRN_TBWU:
vcpu->arch.gpr[rt] = mftbu(); break;
case SPRN_SPRG0:
vcpu->arch.gpr[rt] = vcpu->arch.sprg0; break;
case SPRN_SPRG1:
vcpu->arch.gpr[rt] = vcpu->arch.sprg1; break;
case SPRN_SPRG2:
vcpu->arch.gpr[rt] = vcpu->arch.sprg2; break;
case SPRN_SPRG3:
vcpu->arch.gpr[rt] = vcpu->arch.sprg3; break;
/* Note: SPRG4-7 are user-readable, so we don't get
* a trap. */
case SPRN_IVOR0:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[0]; break;
case SPRN_IVOR1:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[1]; break;
case SPRN_IVOR2:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[2]; break;
case SPRN_IVOR3:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[3]; break;
case SPRN_IVOR4:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[4]; break;
case SPRN_IVOR5:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[5]; break;
case SPRN_IVOR6:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[6]; break;
case SPRN_IVOR7:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[7]; break;
case SPRN_IVOR8:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[8]; break;
case SPRN_IVOR9:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[9]; break;
case SPRN_IVOR10:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[10]; break;
case SPRN_IVOR11:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[11]; break;
case SPRN_IVOR12:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[12]; break;
case SPRN_IVOR13:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[13]; break;
case SPRN_IVOR14:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[14]; break;
case SPRN_IVOR15:
vcpu->arch.gpr[rt] = vcpu->arch.ivor[15]; break;
default:
printk("mfspr: unknown spr %x\n", sprn);
vcpu->arch.gpr[rt] = 0;
break;
}
break;
case 407: /* sthx */
rs = get_rs(inst);
ra = get_ra(inst);
rb = get_rb(inst);
emulated = kvmppc_handle_store(run, vcpu,
vcpu->arch.gpr[rs],
2, 1);
break;
case 439: /* sthux */
rs = get_rs(inst);
ra = get_ra(inst);
rb = get_rb(inst);
ea = vcpu->arch.gpr[rb];
if (ra)
ea += vcpu->arch.gpr[ra];
emulated = kvmppc_handle_store(run, vcpu,
vcpu->arch.gpr[rs],
2, 1);
vcpu->arch.gpr[ra] = ea;
break;
case 451: /* mtdcr */
dcrn = get_dcrn(inst);
rs = get_rs(inst);
/* emulate some access in kernel */
switch (dcrn) {
case DCRN_CPR0_CONFIG_ADDR:
vcpu->arch.cpr0_cfgaddr = vcpu->arch.gpr[rs];
break;
default:
run->dcr.dcrn = dcrn;
run->dcr.data = vcpu->arch.gpr[rs];
run->dcr.is_write = 1;
vcpu->arch.dcr_needed = 1;
emulated = EMULATE_DO_DCR;
}
break;
case 467: /* mtspr */
sprn = get_sprn(inst);
rs = get_rs(inst);
switch (sprn) {
case SPRN_SRR0:
vcpu->arch.srr0 = vcpu->arch.gpr[rs]; break;
case SPRN_SRR1:
vcpu->arch.srr1 = vcpu->arch.gpr[rs]; break;
case SPRN_MMUCR:
vcpu->arch.mmucr = vcpu->arch.gpr[rs]; break;
case SPRN_PID:
vcpu->arch.pid = vcpu->arch.gpr[rs]; break;
case SPRN_CCR0:
vcpu->arch.ccr0 = vcpu->arch.gpr[rs]; break;
case SPRN_CCR1:
vcpu->arch.ccr1 = vcpu->arch.gpr[rs]; break;
case SPRN_DEAR:
vcpu->arch.dear = vcpu->arch.gpr[rs]; break;
case SPRN_ESR:
vcpu->arch.esr = vcpu->arch.gpr[rs]; break;
case SPRN_DBCR0:
vcpu->arch.dbcr0 = vcpu->arch.gpr[rs]; break;
case SPRN_DBCR1:
vcpu->arch.dbcr1 = vcpu->arch.gpr[rs]; break;
/* XXX We need to context-switch the timebase for
* watchdog and FIT. */
case SPRN_TBWL: break;
case SPRN_TBWU: break;
case SPRN_DEC:
vcpu->arch.dec = vcpu->arch.gpr[rs];
kvmppc_emulate_dec(vcpu);
break;
case SPRN_TSR:
vcpu->arch.tsr &= ~vcpu->arch.gpr[rs]; break;
case SPRN_TCR:
vcpu->arch.tcr = vcpu->arch.gpr[rs];
kvmppc_emulate_dec(vcpu);
break;
case SPRN_SPRG0:
vcpu->arch.sprg0 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG1:
vcpu->arch.sprg1 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG2:
vcpu->arch.sprg2 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG3:
vcpu->arch.sprg3 = vcpu->arch.gpr[rs]; break;
/* Note: SPRG4-7 are user-readable. These values are
* loaded into the real SPRGs when resuming the
* guest. */
case SPRN_SPRG4:
vcpu->arch.sprg4 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG5:
vcpu->arch.sprg5 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG6:
vcpu->arch.sprg6 = vcpu->arch.gpr[rs]; break;
case SPRN_SPRG7:
vcpu->arch.sprg7 = vcpu->arch.gpr[rs]; break;
case SPRN_IVPR:
vcpu->arch.ivpr = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR0:
vcpu->arch.ivor[0] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR1:
vcpu->arch.ivor[1] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR2:
vcpu->arch.ivor[2] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR3:
vcpu->arch.ivor[3] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR4:
vcpu->arch.ivor[4] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR5:
vcpu->arch.ivor[5] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR6:
vcpu->arch.ivor[6] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR7:
vcpu->arch.ivor[7] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR8:
vcpu->arch.ivor[8] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR9:
vcpu->arch.ivor[9] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR10:
vcpu->arch.ivor[10] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR11:
vcpu->arch.ivor[11] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR12:
vcpu->arch.ivor[12] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR13:
vcpu->arch.ivor[13] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR14:
vcpu->arch.ivor[14] = vcpu->arch.gpr[rs]; break;
case SPRN_IVOR15:
vcpu->arch.ivor[15] = vcpu->arch.gpr[rs]; break;
default:
printk("mtspr: unknown spr %x\n", sprn);
emulated = EMULATE_FAIL;
break;
}
break;
case 470: /* dcbi */
/* Do nothing. The guest is performing dcbi because
* hardware DMA is not snooped by the dcache, but
* emulated DMA either goes through the dcache as
* normal writes, or the host kernel has handled dcache
* coherence. */
break;
case 534: /* lwbrx */
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 0);
break;
case 566: /* tlbsync */
break;
case 662: /* stwbrx */
rs = get_rs(inst);
ra = get_ra(inst);
rb = get_rb(inst);
emulated = kvmppc_handle_store(run, vcpu,
vcpu->arch.gpr[rs],
4, 0);
break;
case 978: /* tlbwe */
emulated = kvmppc_emul_tlbwe(vcpu, inst);
break;
case 914: { /* tlbsx */
int index;
unsigned int as = get_mmucr_sts(vcpu);
unsigned int pid = get_mmucr_stid(vcpu);
rt = get_rt(inst);
ra = get_ra(inst);
rb = get_rb(inst);
rc = get_rc(inst);
ea = vcpu->arch.gpr[rb];
if (ra)
ea += vcpu->arch.gpr[ra];
index = kvmppc_44x_tlb_index(vcpu, ea, pid, as);
if (rc) {
if (index < 0)
vcpu->arch.cr &= ~0x20000000;
else
vcpu->arch.cr |= 0x20000000;
}
vcpu->arch.gpr[rt] = index;
}
break;
case 790: /* lhbrx */
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 0);
break;
case 918: /* sthbrx */
rs = get_rs(inst);
ra = get_ra(inst);
rb = get_rb(inst);
emulated = kvmppc_handle_store(run, vcpu,
vcpu->arch.gpr[rs],
2, 0);
break;
case 966: /* iccci */
break;
default:
printk("unknown: op %d xop %d\n", get_op(inst),
get_xop(inst));
emulated = EMULATE_FAIL;
break;
}
break;
case 32: /* lwz */
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
break;
case 33: /* lwzu */
ra = get_ra(inst);
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 4, 1);
vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
break;
case 34: /* lbz */
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
break;
case 35: /* lbzu */
ra = get_ra(inst);
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 1, 1);
vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
break;
case 36: /* stw */
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
4, 1);
break;
case 37: /* stwu */
ra = get_ra(inst);
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
4, 1);
vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
break;
case 38: /* stb */
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
1, 1);
break;
case 39: /* stbu */
ra = get_ra(inst);
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
1, 1);
vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
break;
case 40: /* lhz */
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
break;
case 41: /* lhzu */
ra = get_ra(inst);
rt = get_rt(inst);
emulated = kvmppc_handle_load(run, vcpu, rt, 2, 1);
vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
break;
case 44: /* sth */
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
2, 1);
break;
case 45: /* sthu */
ra = get_ra(inst);
rs = get_rs(inst);
emulated = kvmppc_handle_store(run, vcpu, vcpu->arch.gpr[rs],
2, 1);
vcpu->arch.gpr[ra] = vcpu->arch.paddr_accessed;
break;
default:
printk("unknown op %d\n", get_op(inst));
emulated = EMULATE_FAIL;
break;
}
if (advance)
vcpu->arch.pc += 4; /* Advance past emulated instruction. */
return emulated;
}

436
arch/powerpc/kvm/powerpc.c Normal file
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@ -0,0 +1,436 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
* Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
*/
#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <asm/cputable.h>
#include <asm/uaccess.h>
#include <asm/kvm_ppc.h>
gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
return gfn;
}
int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
{
/* XXX implement me */
return 0;
}
int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
return 1;
}
int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
enum emulation_result er;
int r;
er = kvmppc_emulate_instruction(run, vcpu);
switch (er) {
case EMULATE_DONE:
/* Future optimization: only reload non-volatiles if they were
* actually modified. */
r = RESUME_GUEST_NV;
break;
case EMULATE_DO_MMIO:
run->exit_reason = KVM_EXIT_MMIO;
/* We must reload nonvolatiles because "update" load/store
* instructions modify register state. */
/* Future optimization: only reload non-volatiles if they were
* actually modified. */
r = RESUME_HOST_NV;
break;
case EMULATE_FAIL:
/* XXX Deliver Program interrupt to guest. */
printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
vcpu->arch.last_inst);
r = RESUME_HOST;
break;
default:
BUG();
}
return r;
}
void kvm_arch_hardware_enable(void *garbage)
{
}
void kvm_arch_hardware_disable(void *garbage)
{
}
int kvm_arch_hardware_setup(void)
{
return 0;
}
void kvm_arch_hardware_unsetup(void)
{
}
void kvm_arch_check_processor_compat(void *rtn)
{
int r;
if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
r = 0;
else
r = -ENOTSUPP;
*(int *)rtn = r;
}
struct kvm *kvm_arch_create_vm(void)
{
struct kvm *kvm;
kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
if (!kvm)
return ERR_PTR(-ENOMEM);
return kvm;
}
static void kvmppc_free_vcpus(struct kvm *kvm)
{
unsigned int i;
for (i = 0; i < KVM_MAX_VCPUS; ++i) {
if (kvm->vcpus[i]) {
kvm_arch_vcpu_free(kvm->vcpus[i]);
kvm->vcpus[i] = NULL;
}
}
}
void kvm_arch_destroy_vm(struct kvm *kvm)
{
kvmppc_free_vcpus(kvm);
kvm_free_physmem(kvm);
kfree(kvm);
}
int kvm_dev_ioctl_check_extension(long ext)
{
int r;
switch (ext) {
case KVM_CAP_USER_MEMORY:
r = 1;
break;
default:
r = 0;
break;
}
return r;
}
long kvm_arch_dev_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
return -EINVAL;
}
int kvm_arch_set_memory_region(struct kvm *kvm,
struct kvm_userspace_memory_region *mem,
struct kvm_memory_slot old,
int user_alloc)
{
return 0;
}
struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
struct kvm_vcpu *vcpu;
int err;
vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
if (!vcpu) {
err = -ENOMEM;
goto out;
}
err = kvm_vcpu_init(vcpu, kvm, id);
if (err)
goto free_vcpu;
return vcpu;
free_vcpu:
kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
return ERR_PTR(err);
}
void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
kvm_vcpu_uninit(vcpu);
kmem_cache_free(kvm_vcpu_cache, vcpu);
}
void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
kvm_arch_vcpu_free(vcpu);
}
int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];
return test_bit(priority, &vcpu->arch.pending_exceptions);
}
static void kvmppc_decrementer_func(unsigned long data)
{
struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);
}
int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
(unsigned long)vcpu);
return 0;
}
void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
}
void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
}
void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
}
void decache_vcpus_on_cpu(int cpu)
{
}
int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
struct kvm_debug_guest *dbg)
{
return -ENOTSUPP;
}
static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
struct kvm_run *run)
{
u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
*gpr = run->dcr.data;
}
static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
struct kvm_run *run)
{
u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
if (run->mmio.len > sizeof(*gpr)) {
printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
return;
}
if (vcpu->arch.mmio_is_bigendian) {
switch (run->mmio.len) {
case 4: *gpr = *(u32 *)run->mmio.data; break;
case 2: *gpr = *(u16 *)run->mmio.data; break;
case 1: *gpr = *(u8 *)run->mmio.data; break;
}
} else {
/* Convert BE data from userland back to LE. */
switch (run->mmio.len) {
case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
case 1: *gpr = *(u8 *)run->mmio.data; break;
}
}
}
int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int rt, unsigned int bytes, int is_bigendian)
{
if (bytes > sizeof(run->mmio.data)) {
printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
run->mmio.len);
}
run->mmio.phys_addr = vcpu->arch.paddr_accessed;
run->mmio.len = bytes;
run->mmio.is_write = 0;
vcpu->arch.io_gpr = rt;
vcpu->arch.mmio_is_bigendian = is_bigendian;
vcpu->mmio_needed = 1;
vcpu->mmio_is_write = 0;
return EMULATE_DO_MMIO;
}
int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
u32 val, unsigned int bytes, int is_bigendian)
{
void *data = run->mmio.data;
if (bytes > sizeof(run->mmio.data)) {
printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
run->mmio.len);
}
run->mmio.phys_addr = vcpu->arch.paddr_accessed;
run->mmio.len = bytes;
run->mmio.is_write = 1;
vcpu->mmio_needed = 1;
vcpu->mmio_is_write = 1;
/* Store the value at the lowest bytes in 'data'. */
if (is_bigendian) {
switch (bytes) {
case 4: *(u32 *)data = val; break;
case 2: *(u16 *)data = val; break;
case 1: *(u8 *)data = val; break;
}
} else {
/* Store LE value into 'data'. */
switch (bytes) {
case 4: st_le32(data, val); break;
case 2: st_le16(data, val); break;
case 1: *(u8 *)data = val; break;
}
}
return EMULATE_DO_MMIO;
}
int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
int r;
sigset_t sigsaved;
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);
if (vcpu->mmio_needed) {
if (!vcpu->mmio_is_write)
kvmppc_complete_mmio_load(vcpu, run);
vcpu->mmio_needed = 0;
} else if (vcpu->arch.dcr_needed) {
if (!vcpu->arch.dcr_is_write)
kvmppc_complete_dcr_load(vcpu, run);
vcpu->arch.dcr_needed = 0;
}
kvmppc_check_and_deliver_interrupts(vcpu);
local_irq_disable();
kvm_guest_enter();
r = __kvmppc_vcpu_run(run, vcpu);
kvm_guest_exit();
local_irq_enable();
if (vcpu->sigset_active)
sigprocmask(SIG_SETMASK, &sigsaved, NULL);
return r;
}
int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);
return 0;
}
int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
return -EINVAL;
}
int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
struct kvm_mp_state *mp_state)
{
return -EINVAL;
}
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;
long r;
switch (ioctl) {
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;
}
default:
r = -EINVAL;
}
out:
return r;
}
int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
return -ENOTSUPP;
}
long kvm_arch_vm_ioctl(struct file *filp,
unsigned int ioctl, unsigned long arg)
{
long r;
switch (ioctl) {
default:
r = -EINVAL;
}
return r;
}
int kvm_arch_init(void *opaque)
{
return 0;
}
void kvm_arch_exit(void)
{
}

53
include/asm-powerpc/kvm.h
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@ -1,6 +1,55 @@
/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#ifndef __LINUX_KVM_POWERPC_H
#define __LINUX_KVM_POWERPC_H
/* powerpc does not support KVM */
#include <asm/types.h>
#endif
struct kvm_regs {
__u64 pc;
__u64 cr;
__u64 ctr;
__u64 lr;
__u64 xer;
__u64 msr;
__u64 srr0;
__u64 srr1;
__u64 pid;
__u64 sprg0;
__u64 sprg1;
__u64 sprg2;
__u64 sprg3;
__u64 sprg4;
__u64 sprg5;
__u64 sprg6;
__u64 sprg7;
__u64 gpr[32];
};
struct kvm_sregs {
};
struct kvm_fpu {
__u64 fpr[32];
};
#endif /* __LINUX_KVM_POWERPC_H */

55
include/asm-powerpc/kvm_asm.h Normal file
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2008
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#ifndef __POWERPC_KVM_ASM_H__
#define __POWERPC_KVM_ASM_H__
/* IVPR must be 64KiB-aligned. */
#define VCPU_SIZE_ORDER 4
#define VCPU_SIZE_LOG (VCPU_SIZE_ORDER + 12)
#define VCPU_TLB_PGSZ PPC44x_TLB_64K
#define VCPU_SIZE_BYTES (1<<VCPU_SIZE_LOG)
#define BOOKE_INTERRUPT_CRITICAL 0
#define BOOKE_INTERRUPT_MACHINE_CHECK 1
#define BOOKE_INTERRUPT_DATA_STORAGE 2
#define BOOKE_INTERRUPT_INST_STORAGE 3
#define BOOKE_INTERRUPT_EXTERNAL 4
#define BOOKE_INTERRUPT_ALIGNMENT 5
#define BOOKE_INTERRUPT_PROGRAM 6
#define BOOKE_INTERRUPT_FP_UNAVAIL 7
#define BOOKE_INTERRUPT_SYSCALL 8
#define BOOKE_INTERRUPT_AP_UNAVAIL 9
#define BOOKE_INTERRUPT_DECREMENTER 10
#define BOOKE_INTERRUPT_FIT 11
#define BOOKE_INTERRUPT_WATCHDOG 12
#define BOOKE_INTERRUPT_DTLB_MISS 13
#define BOOKE_INTERRUPT_ITLB_MISS 14
#define BOOKE_INTERRUPT_DEBUG 15
#define BOOKE_MAX_INTERRUPT 15
#define RESUME_FLAG_NV (1<<0) /* Reload guest nonvolatile state? */
#define RESUME_FLAG_HOST (1<<1) /* Resume host? */
#define RESUME_GUEST 0
#define RESUME_GUEST_NV RESUME_FLAG_NV
#define RESUME_HOST RESUME_FLAG_HOST
#define RESUME_HOST_NV (RESUME_FLAG_HOST|RESUME_FLAG_NV)
#endif /* __POWERPC_KVM_ASM_H__ */

152
include/asm-powerpc/kvm_host.h Normal file
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2007
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#ifndef __POWERPC_KVM_HOST_H__
#define __POWERPC_KVM_HOST_H__
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/kvm_types.h>
#include <asm/kvm_asm.h>
#define KVM_MAX_VCPUS 1
#define KVM_MEMORY_SLOTS 32
/* memory slots that does not exposed to userspace */
#define KVM_PRIVATE_MEM_SLOTS 4
/* We don't currently support large pages. */
#define KVM_PAGES_PER_HPAGE (1<<31)
struct kvm;
struct kvm_run;
struct kvm_vcpu;
struct kvm_vm_stat {
u32 remote_tlb_flush;
};
struct kvm_vcpu_stat {
u32 sum_exits;
u32 mmio_exits;
u32 dcr_exits;
u32 signal_exits;
u32 light_exits;
/* Account for special types of light exits: */
u32 itlb_real_miss_exits;
u32 itlb_virt_miss_exits;
u32 dtlb_real_miss_exits;
u32 dtlb_virt_miss_exits;
u32 syscall_exits;
u32 isi_exits;
u32 dsi_exits;
u32 emulated_inst_exits;
u32 dec_exits;
u32 ext_intr_exits;
};
struct tlbe {
u32 tid; /* Only the low 8 bits are used. */
u32 word0;
u32 word1;
u32 word2;
};
struct kvm_arch {
};
struct kvm_vcpu_arch {
/* Unmodified copy of the guest's TLB. */
struct tlbe guest_tlb[PPC44x_TLB_SIZE];
/* TLB that's actually used when the guest is running. */
struct tlbe shadow_tlb[PPC44x_TLB_SIZE];
/* Pages which are referenced in the shadow TLB. */
struct page *shadow_pages[PPC44x_TLB_SIZE];
/* Copy of the host's TLB. */
struct tlbe host_tlb[PPC44x_TLB_SIZE];
u32 host_stack;
u32 host_pid;
u64 fpr[32];
u32 gpr[32];
u32 pc;
u32 cr;
u32 ctr;
u32 lr;
u32 xer;
u32 msr;
u32 mmucr;
u32 sprg0;
u32 sprg1;
u32 sprg2;
u32 sprg3;
u32 sprg4;
u32 sprg5;
u32 sprg6;
u32 sprg7;
u32 srr0;
u32 srr1;
u32 csrr0;
u32 csrr1;
u32 dsrr0;
u32 dsrr1;
u32 dear;
u32 esr;
u32 dec;
u32 decar;
u32 tbl;
u32 tbu;
u32 tcr;
u32 tsr;
u32 ivor[16];
u32 ivpr;
u32 pir;
u32 pid;
u32 pvr;
u32 ccr0;
u32 ccr1;
u32 dbcr0;
u32 dbcr1;
u32 last_inst;
u32 fault_dear;
u32 fault_esr;
gpa_t paddr_accessed;
u8 io_gpr; /* GPR used as IO source/target */
u8 mmio_is_bigendian;
u8 dcr_needed;
u8 dcr_is_write;
u32 cpr0_cfgaddr; /* holds the last set cpr0_cfgaddr */
struct timer_list dec_timer;
unsigned long pending_exceptions;
};
struct kvm_guest_debug {
int enabled;
unsigned long bp[4];
int singlestep;
};
#endif /* __POWERPC_KVM_HOST_H__ */

37
include/asm-powerpc/kvm_para.h Normal file
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2008
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#ifndef __POWERPC_KVM_PARA_H__
#define __POWERPC_KVM_PARA_H__
#ifdef __KERNEL__
static inline int kvm_para_available(void)
{
return 0;
}
static inline unsigned int kvm_arch_para_features(void)
{
return 0;
}
#endif /* __KERNEL__ */
#endif /* __POWERPC_KVM_PARA_H__ */

88
include/asm-powerpc/kvm_ppc.h Normal file
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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright IBM Corp. 2008
*
* Authors: Hollis Blanchard <hollisb@us.ibm.com>
*/
#ifndef __POWERPC_KVM_PPC_H__
#define __POWERPC_KVM_PPC_H__
/* This file exists just so we can dereference kvm_vcpu, avoiding nested header
* dependencies. */
#include <linux/mutex.h>
#include <linux/timer.h>
#include <linux/types.h>
#include <linux/kvm_types.h>
#include <linux/kvm_host.h>
struct kvm_tlb {
struct tlbe guest_tlb[PPC44x_TLB_SIZE];
struct tlbe shadow_tlb[PPC44x_TLB_SIZE];
};
enum emulation_result {
EMULATE_DONE, /* no further processing */
EMULATE_DO_MMIO, /* kvm_run filled with MMIO request */
EMULATE_DO_DCR, /* kvm_run filled with DCR request */
EMULATE_FAIL, /* can't emulate this instruction */
};
extern const unsigned char exception_priority[];
extern const unsigned char priority_exception[];
extern int __kvmppc_vcpu_run(struct kvm_run *kvm_run, struct kvm_vcpu *vcpu);
extern char kvmppc_handlers_start[];
extern unsigned long kvmppc_handler_len;
extern void kvmppc_dump_vcpu(struct kvm_vcpu *vcpu);
extern int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
unsigned int rt, unsigned int bytes,
int is_bigendian);
extern int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
u32 val, unsigned int bytes, int is_bigendian);
extern int kvmppc_emulate_instruction(struct kvm_run *run,
struct kvm_vcpu *vcpu);
extern void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 gvaddr, gfn_t gfn,
u64 asid, u32 flags);
extern void kvmppc_mmu_invalidate(struct kvm_vcpu *vcpu, u64 eaddr, u64 asid);
extern void kvmppc_mmu_priv_switch(struct kvm_vcpu *vcpu, int usermode);
extern void kvmppc_check_and_deliver_interrupts(struct kvm_vcpu *vcpu);
static inline void kvmppc_queue_exception(struct kvm_vcpu *vcpu, int exception)
{
unsigned int priority = exception_priority[exception];
set_bit(priority, &vcpu->arch.pending_exceptions);
}
static inline void kvmppc_clear_exception(struct kvm_vcpu *vcpu, int exception)
{
unsigned int priority = exception_priority[exception];
clear_bit(priority, &vcpu->arch.pending_exceptions);
}
static inline void kvmppc_set_msr(struct kvm_vcpu *vcpu, u32 new_msr)
{
if ((new_msr & MSR_PR) != (vcpu->arch.msr & MSR_PR))
kvmppc_mmu_priv_switch(vcpu, new_msr & MSR_PR);
vcpu->arch.msr = new_msr;
}
#endif /* __POWERPC_KVM_PPC_H__ */