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KVM: x86: extend "struct x86_emulate_ops" with "get_cpuid"

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In order to be able to proceed checks on CPU-specific properties
within the emulator, function "get_cpuid" is introduced.
With "get_cpuid" it is possible to virtually call the guests
"cpuid"-opcode without changing the VM's context.

[mtosatti: cleanup/beautify code]

Signed-off-by: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Stephan Bärwolf 2012-01-12 16:43:03 +01:00 committed by Avi Kivity
parent 50e92b3c97
commit bdb42f5afe
2 changed files with 26 additions and 0 deletions
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3
arch/x86/include/asm/kvm_emulate.h
View File

@ -190,6 +190,9 @@ struct x86_emulate_ops {
int (*intercept)(struct x86_emulate_ctxt *ctxt,
struct x86_instruction_info *info,
enum x86_intercept_stage stage);
bool (*get_cpuid)(struct x86_emulate_ctxt *ctxt,
u32 *eax, u32 *ebx, u32 *ecx, u32 *edx);
};
typedef u32 __attribute__((vector_size(16))) sse128_t;

23
arch/x86/kvm/x86.c
View File

@ -4180,6 +4180,28 @@ static int emulator_intercept(struct x86_emulate_ctxt *ctxt,
return kvm_x86_ops->check_intercept(emul_to_vcpu(ctxt), info, stage);
}
static bool emulator_get_cpuid(struct x86_emulate_ctxt *ctxt,
u32 *eax, u32 *ebx, u32 *ecx, u32 *edx)
{
struct kvm_cpuid_entry2 *cpuid = NULL;
if (eax && ecx)
cpuid = kvm_find_cpuid_entry(emul_to_vcpu(ctxt),
*eax, *ecx);
if (cpuid) {
*eax = cpuid->eax;
*ecx = cpuid->ecx;
if (ebx)
*ebx = cpuid->ebx;
if (edx)
*edx = cpuid->edx;
return true;
}
return false;
}
static struct x86_emulate_ops emulate_ops = {
.read_std = kvm_read_guest_virt_system,
.write_std = kvm_write_guest_virt_system,
@ -4211,6 +4233,7 @@ static struct x86_emulate_ops emulate_ops = {
.get_fpu = emulator_get_fpu,
.put_fpu = emulator_put_fpu,
.intercept = emulator_intercept,
.get_cpuid = emulator_get_cpuid,
};
static void cache_all_regs(struct kvm_vcpu *vcpu)