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Merge remote-tracking branch 'qemu-kvm/uq/master' into staging 

# By Paolo Bonzini (2) and Jan Kiszka (1)
# Via Gleb Natapov
* qemu-kvm/uq/master:
  kvmvapic: Prevent reading beyond the end of guest RAM
  x86: cpuid: reconstruct leaf 0Dh data
  x86: fix migration from pre-version 12

Message-id: 1382108641-4862-1-git-send-email-pbonzini@redhat.com
Signed-off-by: Anthony Liguori <aliguori@amazon.com>
This commit is contained in:
Anthony Liguori 2013-10-18 10:03:24 -07:00
parent 3551643eb7 7174e54cf1
commit fc8ead7467
3 changed files with 56 additions and 17 deletions
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3
hw/i386/kvmvapic.c
View File

@ -596,6 +596,9 @@ static int vapic_map_rom_writable(VAPICROMState *s)
section = memory_region_find(as, 0, 1);
/* read ROM size from RAM region */
if (rom_paddr + 2 >= memory_region_size(section.mr)) {
return -1;
}
ram = memory_region_get_ram_ptr(section.mr);
rom_size = ram[rom_paddr + 2] * ROM_BLOCK_SIZE;
if (rom_size == 0) {

66
target-i386/cpu.c
View File

@ -328,6 +328,15 @@ X86RegisterInfo32 x86_reg_info_32[CPU_NB_REGS32] = {
};
#undef REGISTER
typedef struct ExtSaveArea {
uint32_t feature, bits;
uint32_t offset, size;
} ExtSaveArea;
static const ExtSaveArea ext_save_areas[] = {
[2] = { .feature = FEAT_1_ECX, .bits = CPUID_EXT_AVX,
.offset = 0x100, .size = 0x240 },
};
const char *get_register_name_32(unsigned int reg)
{
@ -2177,29 +2186,51 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
*edx = 0;
}
break;
case 0xD:
case 0xD: {
KVMState *s = cs->kvm_state;
uint64_t kvm_mask;
int i;
/* Processor Extended State */
if (!(env->features[FEAT_1_ECX] & CPUID_EXT_XSAVE)) {
*eax = 0;
*ebx = 0;
*ecx = 0;
*edx = 0;
*eax = 0;
*ebx = 0;
*ecx = 0;
*edx = 0;
if (!(env->features[FEAT_1_ECX] & CPUID_EXT_XSAVE) || !kvm_enabled()) {
break;
}
if (kvm_enabled()) {
KVMState *s = cs->kvm_state;
kvm_mask =
kvm_arch_get_supported_cpuid(s, 0xd, 0, R_EAX) |
((uint64_t)kvm_arch_get_supported_cpuid(s, 0xd, 0, R_EDX) << 32);
*eax = kvm_arch_get_supported_cpuid(s, 0xd, count, R_EAX);
*ebx = kvm_arch_get_supported_cpuid(s, 0xd, count, R_EBX);
*ecx = kvm_arch_get_supported_cpuid(s, 0xd, count, R_ECX);
*edx = kvm_arch_get_supported_cpuid(s, 0xd, count, R_EDX);
} else {
*eax = 0;
*ebx = 0;
*ecx = 0;
*edx = 0;
if (count == 0) {
*ecx = 0x240;
for (i = 2; i < ARRAY_SIZE(ext_save_areas); i++) {
const ExtSaveArea *esa = &ext_save_areas[i];
if ((env->features[esa->feature] & esa->bits) == esa->bits &&
(kvm_mask & (1 << i)) != 0) {
if (i < 32) {
*eax |= 1 << i;
} else {
*edx |= 1 << (i - 32);
}
*ecx = MAX(*ecx, esa->offset + esa->size);
}
}
*eax |= kvm_mask & (XSTATE_FP | XSTATE_SSE);
*ebx = *ecx;
} else if (count == 1) {
*eax = kvm_arch_get_supported_cpuid(s, 0xd, 1, R_EAX);
} else if (count < ARRAY_SIZE(ext_save_areas)) {
const ExtSaveArea *esa = &ext_save_areas[count];
if ((env->features[esa->feature] & esa->bits) == esa->bits &&
(kvm_mask & (1 << count)) != 0) {
*eax = esa->offset;
*ebx = esa->size;
}
}
break;
}
case 0x80000000:
*eax = env->cpuid_xlevel;
*ebx = env->cpuid_vendor1;
@ -2402,6 +2433,7 @@ static void x86_cpu_reset(CPUState *s)
env->fpuc = 0x37f;
env->mxcsr = 0x1f80;
env->xstate_bv = XSTATE_FP | XSTATE_SSE;
env->pat = 0x0007040600070406ULL;
env->msr_ia32_misc_enable = MSR_IA32_MISC_ENABLE_DEFAULT;

4
target-i386/cpu.h
View File

@ -380,6 +380,10 @@
#define MSR_VM_HSAVE_PA 0xc0010117
#define XSTATE_FP 1
#define XSTATE_SSE 2
#define XSTATE_YMM 4
/* CPUID feature words */
typedef enum FeatureWord {
FEAT_1_EDX, /* CPUID[1].EDX */