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xemu/target-i386/kvm.c
Jan Kiszka ea64305139 KVM: x86: Restrict writeback of VCPU state 
Do not write nmi_pending, sipi_vector, and mpstate unless we at least go
through a reset. And TSC as well as KVM wallclocks should only be
written on full sync, otherwise we risk to drop some time on state
read-modify-write.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
2010-03-04 00:29:30 -03:00

1208 lines
32 KiB
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/*
* QEMU KVM support
*
* Copyright (C) 2006-2008 Qumranet Technologies
* Copyright IBM, Corp. 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/kvm.h>
#include "qemu-common.h"
#include "sysemu.h"
#include "kvm.h"
#include "cpu.h"
#include "gdbstub.h"
#include "host-utils.h"
#include "hw/pc.h"
#include "ioport.h"
#ifdef CONFIG_KVM_PARA
#include <linux/kvm_para.h>
#endif
//
//#define DEBUG_KVM
#ifdef DEBUG_KVM
#define dprintf(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define dprintf(fmt, ...) \
do { } while (0)
#endif
#define MSR_KVM_WALL_CLOCK 0x11
#define MSR_KVM_SYSTEM_TIME 0x12
#ifdef KVM_CAP_EXT_CPUID
static struct kvm_cpuid2 *try_get_cpuid(KVMState *s, int max)
{
struct kvm_cpuid2 *cpuid;
int r, size;
size = sizeof(*cpuid) + max * sizeof(*cpuid->entries);
cpuid = (struct kvm_cpuid2 *)qemu_mallocz(size);
cpuid->nent = max;
r = kvm_ioctl(s, KVM_GET_SUPPORTED_CPUID, cpuid);
if (r == 0 && cpuid->nent >= max) {
r = -E2BIG;
}
if (r < 0) {
if (r == -E2BIG) {
qemu_free(cpuid);
return NULL;
} else {
fprintf(stderr, "KVM_GET_SUPPORTED_CPUID failed: %s\n",
strerror(-r));
exit(1);
}
}
return cpuid;
}
uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg)
{
struct kvm_cpuid2 *cpuid;
int i, max;
uint32_t ret = 0;
uint32_t cpuid_1_edx;
if (!kvm_check_extension(env->kvm_state, KVM_CAP_EXT_CPUID)) {
return -1U;
}
max = 1;
while ((cpuid = try_get_cpuid(env->kvm_state, max)) == NULL) {
max *= 2;
}
for (i = 0; i < cpuid->nent; ++i) {
if (cpuid->entries[i].function == function) {
switch (reg) {
case R_EAX:
ret = cpuid->entries[i].eax;
break;
case R_EBX:
ret = cpuid->entries[i].ebx;
break;
case R_ECX:
ret = cpuid->entries[i].ecx;
break;
case R_EDX:
ret = cpuid->entries[i].edx;
switch (function) {
case 1:
/* KVM before 2.6.30 misreports the following features */
ret |= CPUID_MTRR | CPUID_PAT | CPUID_MCE | CPUID_MCA;
break;
case 0x80000001:
/* On Intel, kvm returns cpuid according to the Intel spec,
* so add missing bits according to the AMD spec:
*/
cpuid_1_edx = kvm_arch_get_supported_cpuid(env, 1, R_EDX);
ret |= cpuid_1_edx & 0xdfeff7ff;
break;
}
break;
}
}
}
qemu_free(cpuid);
return ret;
}
#else
uint32_t kvm_arch_get_supported_cpuid(CPUState *env, uint32_t function, int reg)
{
return -1U;
}
#endif
static void kvm_trim_features(uint32_t *features, uint32_t supported)
{
int i;
uint32_t mask;
for (i = 0; i < 32; ++i) {
mask = 1U << i;
if ((*features & mask) && !(supported & mask)) {
*features &= ~mask;
}
}
}
#ifdef CONFIG_KVM_PARA
struct kvm_para_features {
int cap;
int feature;
} para_features[] = {
#ifdef KVM_CAP_CLOCKSOURCE
{ KVM_CAP_CLOCKSOURCE, KVM_FEATURE_CLOCKSOURCE },
#endif
#ifdef KVM_CAP_NOP_IO_DELAY
{ KVM_CAP_NOP_IO_DELAY, KVM_FEATURE_NOP_IO_DELAY },
#endif
#ifdef KVM_CAP_PV_MMU
{ KVM_CAP_PV_MMU, KVM_FEATURE_MMU_OP },
#endif
{ -1, -1 }
};
static int get_para_features(CPUState *env)
{
int i, features = 0;
for (i = 0; i < ARRAY_SIZE(para_features) - 1; i++) {
if (kvm_check_extension(env->kvm_state, para_features[i].cap))
features |= (1 << para_features[i].feature);
}
return features;
}
#endif
int kvm_arch_init_vcpu(CPUState *env)
{
struct {
struct kvm_cpuid2 cpuid;
struct kvm_cpuid_entry2 entries[100];
} __attribute__((packed)) cpuid_data;
uint32_t limit, i, j, cpuid_i;
uint32_t unused;
struct kvm_cpuid_entry2 *c;
#ifdef KVM_CPUID_SIGNATURE
uint32_t signature[3];
#endif
env->mp_state = KVM_MP_STATE_RUNNABLE;
kvm_trim_features(&env->cpuid_features,
kvm_arch_get_supported_cpuid(env, 1, R_EDX));
i = env->cpuid_ext_features & CPUID_EXT_HYPERVISOR;
kvm_trim_features(&env->cpuid_ext_features,
kvm_arch_get_supported_cpuid(env, 1, R_ECX));
env->cpuid_ext_features |= i;
kvm_trim_features(&env->cpuid_ext2_features,
kvm_arch_get_supported_cpuid(env, 0x80000001, R_EDX));
kvm_trim_features(&env->cpuid_ext3_features,
kvm_arch_get_supported_cpuid(env, 0x80000001, R_ECX));
cpuid_i = 0;
#ifdef CONFIG_KVM_PARA
/* Paravirtualization CPUIDs */
memcpy(signature, "KVMKVMKVM\0\0\0", 12);
c = &cpuid_data.entries[cpuid_i++];
memset(c, 0, sizeof(*c));
c->function = KVM_CPUID_SIGNATURE;
c->eax = 0;
c->ebx = signature[0];
c->ecx = signature[1];
c->edx = signature[2];
c = &cpuid_data.entries[cpuid_i++];
memset(c, 0, sizeof(*c));
c->function = KVM_CPUID_FEATURES;
c->eax = env->cpuid_kvm_features & get_para_features(env);
#endif
cpu_x86_cpuid(env, 0, 0, &limit, &unused, &unused, &unused);
for (i = 0; i <= limit; i++) {
c = &cpuid_data.entries[cpuid_i++];
switch (i) {
case 2: {
/* Keep reading function 2 till all the input is received */
int times;
c->function = i;
c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC |
KVM_CPUID_FLAG_STATE_READ_NEXT;
cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
times = c->eax & 0xff;
for (j = 1; j < times; ++j) {
c = &cpuid_data.entries[cpuid_i++];
c->function = i;
c->flags = KVM_CPUID_FLAG_STATEFUL_FUNC;
cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
}
break;
}
case 4:
case 0xb:
case 0xd:
for (j = 0; ; j++) {
c->function = i;
c->flags = KVM_CPUID_FLAG_SIGNIFCANT_INDEX;
c->index = j;
cpu_x86_cpuid(env, i, j, &c->eax, &c->ebx, &c->ecx, &c->edx);
if (i == 4 && c->eax == 0)
break;
if (i == 0xb && !(c->ecx & 0xff00))
break;
if (i == 0xd && c->eax == 0)
break;
c = &cpuid_data.entries[cpuid_i++];
}
break;
default:
c->function = i;
c->flags = 0;
cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
break;
}
}
cpu_x86_cpuid(env, 0x80000000, 0, &limit, &unused, &unused, &unused);
for (i = 0x80000000; i <= limit; i++) {
c = &cpuid_data.entries[cpuid_i++];
c->function = i;
c->flags = 0;
cpu_x86_cpuid(env, i, 0, &c->eax, &c->ebx, &c->ecx, &c->edx);
}
cpuid_data.cpuid.nent = cpuid_i;
return kvm_vcpu_ioctl(env, KVM_SET_CPUID2, &cpuid_data);
}
void kvm_arch_reset_vcpu(CPUState *env)
{
env->exception_injected = -1;
env->interrupt_injected = -1;
env->nmi_injected = 0;
env->nmi_pending = 0;
}
static int kvm_has_msr_star(CPUState *env)
{
static int has_msr_star;
int ret;
/* first time */
if (has_msr_star == 0) {
struct kvm_msr_list msr_list, *kvm_msr_list;
has_msr_star = -1;
/* Obtain MSR list from KVM. These are the MSRs that we must
* save/restore */
msr_list.nmsrs = 0;
ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, &msr_list);
if (ret < 0 && ret != -E2BIG) {
return 0;
}
/* Old kernel modules had a bug and could write beyond the provided
memory. Allocate at least a safe amount of 1K. */
kvm_msr_list = qemu_mallocz(MAX(1024, sizeof(msr_list) +
msr_list.nmsrs *
sizeof(msr_list.indices[0])));
kvm_msr_list->nmsrs = msr_list.nmsrs;
ret = kvm_ioctl(env->kvm_state, KVM_GET_MSR_INDEX_LIST, kvm_msr_list);
if (ret >= 0) {
int i;
for (i = 0; i < kvm_msr_list->nmsrs; i++) {
if (kvm_msr_list->indices[i] == MSR_STAR) {
has_msr_star = 1;
break;
}
}
}
free(kvm_msr_list);
}
if (has_msr_star == 1)
return 1;
return 0;
}
int kvm_arch_init(KVMState *s, int smp_cpus)
{
int ret;
/* create vm86 tss. KVM uses vm86 mode to emulate 16-bit code
* directly. In order to use vm86 mode, a TSS is needed. Since this
* must be part of guest physical memory, we need to allocate it. Older
* versions of KVM just assumed that it would be at the end of physical
* memory but that doesn't work with more than 4GB of memory. We simply
* refuse to work with those older versions of KVM. */
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, KVM_CAP_SET_TSS_ADDR);
if (ret <= 0) {
fprintf(stderr, "kvm does not support KVM_CAP_SET_TSS_ADDR\n");
return ret;
}
/* this address is 3 pages before the bios, and the bios should present
* as unavaible memory. FIXME, need to ensure the e820 map deals with
* this?
*/
/*
* Tell fw_cfg to notify the BIOS to reserve the range.
*/
if (e820_add_entry(0xfffbc000, 0x4000, E820_RESERVED) < 0) {
perror("e820_add_entry() table is full");
exit(1);
}
return kvm_vm_ioctl(s, KVM_SET_TSS_ADDR, 0xfffbd000);
}
static void set_v8086_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
{
lhs->selector = rhs->selector;
lhs->base = rhs->base;
lhs->limit = rhs->limit;
lhs->type = 3;
lhs->present = 1;
lhs->dpl = 3;
lhs->db = 0;
lhs->s = 1;
lhs->l = 0;
lhs->g = 0;
lhs->avl = 0;
lhs->unusable = 0;
}
static void set_seg(struct kvm_segment *lhs, const SegmentCache *rhs)
{
unsigned flags = rhs->flags;
lhs->selector = rhs->selector;
lhs->base = rhs->base;
lhs->limit = rhs->limit;
lhs->type = (flags >> DESC_TYPE_SHIFT) & 15;
lhs->present = (flags & DESC_P_MASK) != 0;
lhs->dpl = rhs->selector & 3;
lhs->db = (flags >> DESC_B_SHIFT) & 1;
lhs->s = (flags & DESC_S_MASK) != 0;
lhs->l = (flags >> DESC_L_SHIFT) & 1;
lhs->g = (flags & DESC_G_MASK) != 0;
lhs->avl = (flags & DESC_AVL_MASK) != 0;
lhs->unusable = 0;
}
static void get_seg(SegmentCache *lhs, const struct kvm_segment *rhs)
{
lhs->selector = rhs->selector;
lhs->base = rhs->base;
lhs->limit = rhs->limit;
lhs->flags =
(rhs->type << DESC_TYPE_SHIFT)
| (rhs->present * DESC_P_MASK)
| (rhs->dpl << DESC_DPL_SHIFT)
| (rhs->db << DESC_B_SHIFT)
| (rhs->s * DESC_S_MASK)
| (rhs->l << DESC_L_SHIFT)
| (rhs->g * DESC_G_MASK)
| (rhs->avl * DESC_AVL_MASK);
}
static void kvm_getput_reg(__u64 *kvm_reg, target_ulong *qemu_reg, int set)
{
if (set)
*kvm_reg = *qemu_reg;
else
*qemu_reg = *kvm_reg;
}
static int kvm_getput_regs(CPUState *env, int set)
{
struct kvm_regs regs;
int ret = 0;
if (!set) {
ret = kvm_vcpu_ioctl(env, KVM_GET_REGS, &regs);
if (ret < 0)
return ret;
}
kvm_getput_reg(&regs.rax, &env->regs[R_EAX], set);
kvm_getput_reg(&regs.rbx, &env->regs[R_EBX], set);
kvm_getput_reg(&regs.rcx, &env->regs[R_ECX], set);
kvm_getput_reg(&regs.rdx, &env->regs[R_EDX], set);
kvm_getput_reg(&regs.rsi, &env->regs[R_ESI], set);
kvm_getput_reg(&regs.rdi, &env->regs[R_EDI], set);
kvm_getput_reg(&regs.rsp, &env->regs[R_ESP], set);
kvm_getput_reg(&regs.rbp, &env->regs[R_EBP], set);
#ifdef TARGET_X86_64
kvm_getput_reg(&regs.r8, &env->regs[8], set);
kvm_getput_reg(&regs.r9, &env->regs[9], set);
kvm_getput_reg(&regs.r10, &env->regs[10], set);
kvm_getput_reg(&regs.r11, &env->regs[11], set);
kvm_getput_reg(&regs.r12, &env->regs[12], set);
kvm_getput_reg(&regs.r13, &env->regs[13], set);
kvm_getput_reg(&regs.r14, &env->regs[14], set);
kvm_getput_reg(&regs.r15, &env->regs[15], set);
#endif
kvm_getput_reg(&regs.rflags, &env->eflags, set);
kvm_getput_reg(&regs.rip, &env->eip, set);
if (set)
ret = kvm_vcpu_ioctl(env, KVM_SET_REGS, &regs);
return ret;
}
static int kvm_put_fpu(CPUState *env)
{
struct kvm_fpu fpu;
int i;
memset(&fpu, 0, sizeof fpu);
fpu.fsw = env->fpus & ~(7 << 11);
fpu.fsw |= (env->fpstt & 7) << 11;
fpu.fcw = env->fpuc;
for (i = 0; i < 8; ++i)
fpu.ftwx |= (!env->fptags[i]) << i;
memcpy(fpu.fpr, env->fpregs, sizeof env->fpregs);
memcpy(fpu.xmm, env->xmm_regs, sizeof env->xmm_regs);
fpu.mxcsr = env->mxcsr;
return kvm_vcpu_ioctl(env, KVM_SET_FPU, &fpu);
}
static int kvm_put_sregs(CPUState *env)
{
struct kvm_sregs sregs;
memset(sregs.interrupt_bitmap, 0, sizeof(sregs.interrupt_bitmap));
if (env->interrupt_injected >= 0) {
sregs.interrupt_bitmap[env->interrupt_injected / 64] |=
(uint64_t)1 << (env->interrupt_injected % 64);
}
if ((env->eflags & VM_MASK)) {
set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
set_v8086_seg(&sregs.es, &env->segs[R_ES]);
set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
} else {
set_seg(&sregs.cs, &env->segs[R_CS]);
set_seg(&sregs.ds, &env->segs[R_DS]);
set_seg(&sregs.es, &env->segs[R_ES]);
set_seg(&sregs.fs, &env->segs[R_FS]);
set_seg(&sregs.gs, &env->segs[R_GS]);
set_seg(&sregs.ss, &env->segs[R_SS]);
if (env->cr[0] & CR0_PE_MASK) {
/* force ss cpl to cs cpl */
sregs.ss.selector = (sregs.ss.selector & ~3) |
(sregs.cs.selector & 3);
sregs.ss.dpl = sregs.ss.selector & 3;
}
}
set_seg(&sregs.tr, &env->tr);
set_seg(&sregs.ldt, &env->ldt);
sregs.idt.limit = env->idt.limit;
sregs.idt.base = env->idt.base;
sregs.gdt.limit = env->gdt.limit;
sregs.gdt.base = env->gdt.base;
sregs.cr0 = env->cr[0];
sregs.cr2 = env->cr[2];
sregs.cr3 = env->cr[3];
sregs.cr4 = env->cr[4];
sregs.cr8 = cpu_get_apic_tpr(env);
sregs.apic_base = cpu_get_apic_base(env);
sregs.efer = env->efer;
return kvm_vcpu_ioctl(env, KVM_SET_SREGS, &sregs);
}
static void kvm_msr_entry_set(struct kvm_msr_entry *entry,
uint32_t index, uint64_t value)
{
entry->index = index;
entry->data = value;
}
static int kvm_put_msrs(CPUState *env, int level)
{
struct {
struct kvm_msrs info;
struct kvm_msr_entry entries[100];
} msr_data;
struct kvm_msr_entry *msrs = msr_data.entries;
int n = 0;
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_CS, env->sysenter_cs);
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_ESP, env->sysenter_esp);
kvm_msr_entry_set(&msrs[n++], MSR_IA32_SYSENTER_EIP, env->sysenter_eip);
if (kvm_has_msr_star(env))
kvm_msr_entry_set(&msrs[n++], MSR_STAR, env->star);
#ifdef TARGET_X86_64
/* FIXME if lm capable */
kvm_msr_entry_set(&msrs[n++], MSR_CSTAR, env->cstar);
kvm_msr_entry_set(&msrs[n++], MSR_KERNELGSBASE, env->kernelgsbase);
kvm_msr_entry_set(&msrs[n++], MSR_FMASK, env->fmask);
kvm_msr_entry_set(&msrs[n++], MSR_LSTAR, env->lstar);
#endif
if (level == KVM_PUT_FULL_STATE) {
kvm_msr_entry_set(&msrs[n++], MSR_IA32_TSC, env->tsc);
kvm_msr_entry_set(&msrs[n++], MSR_KVM_SYSTEM_TIME,
env->system_time_msr);
kvm_msr_entry_set(&msrs[n++], MSR_KVM_WALL_CLOCK, env->wall_clock_msr);
}
msr_data.info.nmsrs = n;
return kvm_vcpu_ioctl(env, KVM_SET_MSRS, &msr_data);
}
static int kvm_get_fpu(CPUState *env)
{
struct kvm_fpu fpu;
int i, ret;
ret = kvm_vcpu_ioctl(env, KVM_GET_FPU, &fpu);
if (ret < 0)
return ret;
env->fpstt = (fpu.fsw >> 11) & 7;
env->fpus = fpu.fsw;
env->fpuc = fpu.fcw;
for (i = 0; i < 8; ++i)
env->fptags[i] = !((fpu.ftwx >> i) & 1);
memcpy(env->fpregs, fpu.fpr, sizeof env->fpregs);
memcpy(env->xmm_regs, fpu.xmm, sizeof env->xmm_regs);
env->mxcsr = fpu.mxcsr;
return 0;
}
static int kvm_get_sregs(CPUState *env)
{
struct kvm_sregs sregs;
uint32_t hflags;
int bit, i, ret;
ret = kvm_vcpu_ioctl(env, KVM_GET_SREGS, &sregs);
if (ret < 0)
return ret;
/* There can only be one pending IRQ set in the bitmap at a time, so try
to find it and save its number instead (-1 for none). */
env->interrupt_injected = -1;
for (i = 0; i < ARRAY_SIZE(sregs.interrupt_bitmap); i++) {
if (sregs.interrupt_bitmap[i]) {
bit = ctz64(sregs.interrupt_bitmap[i]);
env->interrupt_injected = i * 64 + bit;
break;
}
}
get_seg(&env->segs[R_CS], &sregs.cs);
get_seg(&env->segs[R_DS], &sregs.ds);
get_seg(&env->segs[R_ES], &sregs.es);
get_seg(&env->segs[R_FS], &sregs.fs);
get_seg(&env->segs[R_GS], &sregs.gs);
get_seg(&env->segs[R_SS], &sregs.ss);
get_seg(&env->tr, &sregs.tr);
get_seg(&env->ldt, &sregs.ldt);
env->idt.limit = sregs.idt.limit;
env->idt.base = sregs.idt.base;
env->gdt.limit = sregs.gdt.limit;
env->gdt.base = sregs.gdt.base;
env->cr[0] = sregs.cr0;
env->cr[2] = sregs.cr2;
env->cr[3] = sregs.cr3;
env->cr[4] = sregs.cr4;
cpu_set_apic_base(env, sregs.apic_base);
env->efer = sregs.efer;
//cpu_set_apic_tpr(env, sregs.cr8);
#define HFLAG_COPY_MASK ~( \
HF_CPL_MASK | HF_PE_MASK | HF_MP_MASK | HF_EM_MASK | \
HF_TS_MASK | HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK | \
HF_OSFXSR_MASK | HF_LMA_MASK | HF_CS32_MASK | \
HF_SS32_MASK | HF_CS64_MASK | HF_ADDSEG_MASK)
hflags = (env->segs[R_CS].flags >> DESC_DPL_SHIFT) & HF_CPL_MASK;
hflags |= (env->cr[0] & CR0_PE_MASK) << (HF_PE_SHIFT - CR0_PE_SHIFT);
hflags |= (env->cr[0] << (HF_MP_SHIFT - CR0_MP_SHIFT)) &
(HF_MP_MASK | HF_EM_MASK | HF_TS_MASK);
hflags |= (env->eflags & (HF_TF_MASK | HF_VM_MASK | HF_IOPL_MASK));
hflags |= (env->cr[4] & CR4_OSFXSR_MASK) <<
(HF_OSFXSR_SHIFT - CR4_OSFXSR_SHIFT);
if (env->efer & MSR_EFER_LMA) {
hflags |= HF_LMA_MASK;
}
if ((hflags & HF_LMA_MASK) && (env->segs[R_CS].flags & DESC_L_MASK)) {
hflags |= HF_CS32_MASK | HF_SS32_MASK | HF_CS64_MASK;
} else {
hflags |= (env->segs[R_CS].flags & DESC_B_MASK) >>
(DESC_B_SHIFT - HF_CS32_SHIFT);
hflags |= (env->segs[R_SS].flags & DESC_B_MASK) >>
(DESC_B_SHIFT - HF_SS32_SHIFT);
if (!(env->cr[0] & CR0_PE_MASK) ||
(env->eflags & VM_MASK) ||
!(hflags & HF_CS32_MASK)) {
hflags |= HF_ADDSEG_MASK;
} else {
hflags |= ((env->segs[R_DS].base |
env->segs[R_ES].base |
env->segs[R_SS].base) != 0) <<
HF_ADDSEG_SHIFT;
}
}
env->hflags = (env->hflags & HFLAG_COPY_MASK) | hflags;
return 0;
}
static int kvm_get_msrs(CPUState *env)
{
struct {
struct kvm_msrs info;
struct kvm_msr_entry entries[100];
} msr_data;
struct kvm_msr_entry *msrs = msr_data.entries;
int ret, i, n;
n = 0;
msrs[n++].index = MSR_IA32_SYSENTER_CS;
msrs[n++].index = MSR_IA32_SYSENTER_ESP;
msrs[n++].index = MSR_IA32_SYSENTER_EIP;
if (kvm_has_msr_star(env))
msrs[n++].index = MSR_STAR;
msrs[n++].index = MSR_IA32_TSC;
#ifdef TARGET_X86_64
/* FIXME lm_capable_kernel */
msrs[n++].index = MSR_CSTAR;
msrs[n++].index = MSR_KERNELGSBASE;
msrs[n++].index = MSR_FMASK;
msrs[n++].index = MSR_LSTAR;
#endif
msrs[n++].index = MSR_KVM_SYSTEM_TIME;
msrs[n++].index = MSR_KVM_WALL_CLOCK;
msr_data.info.nmsrs = n;
ret = kvm_vcpu_ioctl(env, KVM_GET_MSRS, &msr_data);
if (ret < 0)
return ret;
for (i = 0; i < ret; i++) {
switch (msrs[i].index) {
case MSR_IA32_SYSENTER_CS:
env->sysenter_cs = msrs[i].data;
break;
case MSR_IA32_SYSENTER_ESP:
env->sysenter_esp = msrs[i].data;
break;
case MSR_IA32_SYSENTER_EIP:
env->sysenter_eip = msrs[i].data;
break;
case MSR_STAR:
env->star = msrs[i].data;
break;
#ifdef TARGET_X86_64
case MSR_CSTAR:
env->cstar = msrs[i].data;
break;
case MSR_KERNELGSBASE:
env->kernelgsbase = msrs[i].data;
break;
case MSR_FMASK:
env->fmask = msrs[i].data;
break;
case MSR_LSTAR:
env->lstar = msrs[i].data;
break;
#endif
case MSR_IA32_TSC:
env->tsc = msrs[i].data;
break;
case MSR_KVM_SYSTEM_TIME:
env->system_time_msr = msrs[i].data;
break;
case MSR_KVM_WALL_CLOCK:
env->wall_clock_msr = msrs[i].data;
break;
}
}
return 0;
}
static int kvm_put_mp_state(CPUState *env)
{
struct kvm_mp_state mp_state = { .mp_state = env->mp_state };
return kvm_vcpu_ioctl(env, KVM_SET_MP_STATE, &mp_state);
}
static int kvm_get_mp_state(CPUState *env)
{
struct kvm_mp_state mp_state;
int ret;
ret = kvm_vcpu_ioctl(env, KVM_GET_MP_STATE, &mp_state);
if (ret < 0) {
return ret;
}
env->mp_state = mp_state.mp_state;
return 0;
}
static int kvm_put_vcpu_events(CPUState *env, int level)
{
#ifdef KVM_CAP_VCPU_EVENTS
struct kvm_vcpu_events events;
if (!kvm_has_vcpu_events()) {
return 0;
}
events.exception.injected = (env->exception_injected >= 0);
events.exception.nr = env->exception_injected;
events.exception.has_error_code = env->has_error_code;
events.exception.error_code = env->error_code;
events.interrupt.injected = (env->interrupt_injected >= 0);
events.interrupt.nr = env->interrupt_injected;
events.interrupt.soft = env->soft_interrupt;
events.nmi.injected = env->nmi_injected;
events.nmi.pending = env->nmi_pending;
events.nmi.masked = !!(env->hflags2 & HF2_NMI_MASK);
events.sipi_vector = env->sipi_vector;
events.flags = 0;
if (level >= KVM_PUT_RESET_STATE) {
events.flags |=
KVM_VCPUEVENT_VALID_NMI_PENDING | KVM_VCPUEVENT_VALID_SIPI_VECTOR;
}
return kvm_vcpu_ioctl(env, KVM_SET_VCPU_EVENTS, &events);
#else
return 0;
#endif
}
static int kvm_get_vcpu_events(CPUState *env)
{
#ifdef KVM_CAP_VCPU_EVENTS
struct kvm_vcpu_events events;
int ret;
if (!kvm_has_vcpu_events()) {
return 0;
}
ret = kvm_vcpu_ioctl(env, KVM_GET_VCPU_EVENTS, &events);
if (ret < 0) {
return ret;
}
env->exception_injected =
events.exception.injected ? events.exception.nr : -1;
env->has_error_code = events.exception.has_error_code;
env->error_code = events.exception.error_code;
env->interrupt_injected =
events.interrupt.injected ? events.interrupt.nr : -1;
env->soft_interrupt = events.interrupt.soft;
env->nmi_injected = events.nmi.injected;
env->nmi_pending = events.nmi.pending;
if (events.nmi.masked) {
env->hflags2 |= HF2_NMI_MASK;
} else {
env->hflags2 &= ~HF2_NMI_MASK;
}
env->sipi_vector = events.sipi_vector;
#endif
return 0;
}
static int kvm_guest_debug_workarounds(CPUState *env)
{
int ret = 0;
#ifdef KVM_CAP_SET_GUEST_DEBUG
unsigned long reinject_trap = 0;
if (!kvm_has_vcpu_events()) {
if (env->exception_injected == 1) {
reinject_trap = KVM_GUESTDBG_INJECT_DB;
} else if (env->exception_injected == 3) {
reinject_trap = KVM_GUESTDBG_INJECT_BP;
}
env->exception_injected = -1;
}
/*
* Kernels before KVM_CAP_X86_ROBUST_SINGLESTEP overwrote flags.TF
* injected via SET_GUEST_DEBUG while updating GP regs. Work around this
* by updating the debug state once again if single-stepping is on.
* Another reason to call kvm_update_guest_debug here is a pending debug
* trap raise by the guest. On kernels without SET_VCPU_EVENTS we have to
* reinject them via SET_GUEST_DEBUG.
*/
if (reinject_trap ||
(!kvm_has_robust_singlestep() && env->singlestep_enabled)) {
ret = kvm_update_guest_debug(env, reinject_trap);
}
#endif /* KVM_CAP_SET_GUEST_DEBUG */
return ret;
}
int kvm_arch_put_registers(CPUState *env, int level)
{
int ret;
ret = kvm_getput_regs(env, 1);
if (ret < 0)
return ret;
ret = kvm_put_fpu(env);
if (ret < 0)
return ret;
ret = kvm_put_sregs(env);
if (ret < 0)
return ret;
ret = kvm_put_msrs(env, level);
if (ret < 0)
return ret;
if (level >= KVM_PUT_RESET_STATE) {
ret = kvm_put_mp_state(env);
if (ret < 0)
return ret;
}
ret = kvm_put_vcpu_events(env, level);
if (ret < 0)
return ret;
/* must be last */
ret = kvm_guest_debug_workarounds(env);
if (ret < 0)
return ret;
return 0;
}
int kvm_arch_get_registers(CPUState *env)
{
int ret;
ret = kvm_getput_regs(env, 0);
if (ret < 0)
return ret;
ret = kvm_get_fpu(env);
if (ret < 0)
return ret;
ret = kvm_get_sregs(env);
if (ret < 0)
return ret;
ret = kvm_get_msrs(env);
if (ret < 0)
return ret;
ret = kvm_get_mp_state(env);
if (ret < 0)
return ret;
ret = kvm_get_vcpu_events(env);
if (ret < 0)
return ret;
return 0;
}
int kvm_arch_pre_run(CPUState *env, struct kvm_run *run)
{
/* Try to inject an interrupt if the guest can accept it */
if (run->ready_for_interrupt_injection &&
(env->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->eflags & IF_MASK)) {
int irq;
env->interrupt_request &= ~CPU_INTERRUPT_HARD;
irq = cpu_get_pic_interrupt(env);
if (irq >= 0) {
struct kvm_interrupt intr;
intr.irq = irq;
/* FIXME: errors */
dprintf("injected interrupt %d\n", irq);
kvm_vcpu_ioctl(env, KVM_INTERRUPT, &intr);
}
}
/* If we have an interrupt but the guest is not ready to receive an
* interrupt, request an interrupt window exit. This will
* cause a return to userspace as soon as the guest is ready to
* receive interrupts. */
if ((env->interrupt_request & CPU_INTERRUPT_HARD))
run->request_interrupt_window = 1;
else
run->request_interrupt_window = 0;
dprintf("setting tpr\n");
run->cr8 = cpu_get_apic_tpr(env);
return 0;
}
int kvm_arch_post_run(CPUState *env, struct kvm_run *run)
{
if (run->if_flag)
env->eflags |= IF_MASK;
else
env->eflags &= ~IF_MASK;
cpu_set_apic_tpr(env, run->cr8);
cpu_set_apic_base(env, run->apic_base);
return 0;
}
static int kvm_handle_halt(CPUState *env)
{
if (!((env->interrupt_request & CPU_INTERRUPT_HARD) &&
(env->eflags & IF_MASK)) &&
!(env->interrupt_request & CPU_INTERRUPT_NMI)) {
env->halted = 1;
env->exception_index = EXCP_HLT;
return 0;
}
return 1;
}
int kvm_arch_handle_exit(CPUState *env, struct kvm_run *run)
{
int ret = 0;
switch (run->exit_reason) {
case KVM_EXIT_HLT:
dprintf("handle_hlt\n");
ret = kvm_handle_halt(env);
break;
}
return ret;
}
#ifdef KVM_CAP_SET_GUEST_DEBUG
int kvm_arch_insert_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
{
static const uint8_t int3 = 0xcc;
if (cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 0) ||
cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&int3, 1, 1))
return -EINVAL;
return 0;
}
int kvm_arch_remove_sw_breakpoint(CPUState *env, struct kvm_sw_breakpoint *bp)
{
uint8_t int3;
if (cpu_memory_rw_debug(env, bp->pc, &int3, 1, 0) || int3 != 0xcc ||
cpu_memory_rw_debug(env, bp->pc, (uint8_t *)&bp->saved_insn, 1, 1))
return -EINVAL;
return 0;
}
static struct {
target_ulong addr;
int len;
int type;
} hw_breakpoint[4];
static int nb_hw_breakpoint;
static int find_hw_breakpoint(target_ulong addr, int len, int type)
{
int n;
for (n = 0; n < nb_hw_breakpoint; n++)
if (hw_breakpoint[n].addr == addr && hw_breakpoint[n].type == type &&
(hw_breakpoint[n].len == len || len == -1))
return n;
return -1;
}
int kvm_arch_insert_hw_breakpoint(target_ulong addr,
target_ulong len, int type)
{
switch (type) {
case GDB_BREAKPOINT_HW:
len = 1;
break;
case GDB_WATCHPOINT_WRITE:
case GDB_WATCHPOINT_ACCESS:
switch (len) {
case 1:
break;
case 2:
case 4:
case 8:
if (addr & (len - 1))
return -EINVAL;
break;
default:
return -EINVAL;
}
break;
default:
return -ENOSYS;
}
if (nb_hw_breakpoint == 4)
return -ENOBUFS;
if (find_hw_breakpoint(addr, len, type) >= 0)
return -EEXIST;
hw_breakpoint[nb_hw_breakpoint].addr = addr;
hw_breakpoint[nb_hw_breakpoint].len = len;
hw_breakpoint[nb_hw_breakpoint].type = type;
nb_hw_breakpoint++;
return 0;
}
int kvm_arch_remove_hw_breakpoint(target_ulong addr,
target_ulong len, int type)
{
int n;
n = find_hw_breakpoint(addr, (type == GDB_BREAKPOINT_HW) ? 1 : len, type);
if (n < 0)
return -ENOENT;
nb_hw_breakpoint--;
hw_breakpoint[n] = hw_breakpoint[nb_hw_breakpoint];
return 0;
}
void kvm_arch_remove_all_hw_breakpoints(void)
{
nb_hw_breakpoint = 0;
}
static CPUWatchpoint hw_watchpoint;
int kvm_arch_debug(struct kvm_debug_exit_arch *arch_info)
{
int handle = 0;
int n;
if (arch_info->exception == 1) {
if (arch_info->dr6 & (1 << 14)) {
if (cpu_single_env->singlestep_enabled)
handle = 1;
} else {
for (n = 0; n < 4; n++)
if (arch_info->dr6 & (1 << n))
switch ((arch_info->dr7 >> (16 + n*4)) & 0x3) {
case 0x0:
handle = 1;
break;
case 0x1:
handle = 1;
cpu_single_env->watchpoint_hit = &hw_watchpoint;
hw_watchpoint.vaddr = hw_breakpoint[n].addr;
hw_watchpoint.flags = BP_MEM_WRITE;
break;
case 0x3:
handle = 1;
cpu_single_env->watchpoint_hit = &hw_watchpoint;
hw_watchpoint.vaddr = hw_breakpoint[n].addr;
hw_watchpoint.flags = BP_MEM_ACCESS;
break;
}
}
} else if (kvm_find_sw_breakpoint(cpu_single_env, arch_info->pc))
handle = 1;
if (!handle) {
cpu_synchronize_state(cpu_single_env);
assert(cpu_single_env->exception_injected == -1);
cpu_single_env->exception_injected = arch_info->exception;
cpu_single_env->has_error_code = 0;
}
return handle;
}
void kvm_arch_update_guest_debug(CPUState *env, struct kvm_guest_debug *dbg)
{
const uint8_t type_code[] = {
[GDB_BREAKPOINT_HW] = 0x0,
[GDB_WATCHPOINT_WRITE] = 0x1,
[GDB_WATCHPOINT_ACCESS] = 0x3
};
const uint8_t len_code[] = {
[1] = 0x0, [2] = 0x1, [4] = 0x3, [8] = 0x2
};
int n;
if (kvm_sw_breakpoints_active(env))
dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_SW_BP;
if (nb_hw_breakpoint > 0) {
dbg->control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_USE_HW_BP;
dbg->arch.debugreg[7] = 0x0600;
for (n = 0; n < nb_hw_breakpoint; n++) {
dbg->arch.debugreg[n] = hw_breakpoint[n].addr;
dbg->arch.debugreg[7] |= (2 << (n * 2)) |
(type_code[hw_breakpoint[n].type] << (16 + n*4)) |
(len_code[hw_breakpoint[n].len] << (18 + n*4));
}
}
}
#endif /* KVM_CAP_SET_GUEST_DEBUG */
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