diff options
| author | Stephan Bärwolf <stephan.baerwolf@tu-ilmenau.de> | 2012-01-12 16:43:03 +0100 |
|---|---|---|
| committer | Willy Tarreau <w@1wt.eu> | 2012-10-07 23:37:21 +0200 |
| commit | a0c74fba63e4a6ba2c94192f5b79ac3a11cd70f1 (patch) | |
| tree | 958a11f94ad7cd94cf3841ba1611457afe5725e4 /arch | |
| parent | db9faaa340c78618685038d36e368de738ed3d16 (diff) | |
KVM: x86: extend "struct x86_emulate_ops" with "get_cpuid"
commit bdb42f5afebe208eae90406959383856ae2caf2b upstream
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]
[bwh: Backport to 2.6.32:
- Don't use emul_to_vcpu
- Adjust context]
Signed-off-by: Stephan Baerwolf <stephan.baerwolf@tu-ilmenau.de>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Willy Tarreau <w@1wt.eu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/include/asm/kvm_emulate.h | 2 | ||||
| -rw-r--r-- | arch/x86/kvm/x86.c | 23 |
2 files changed, 25 insertions, 0 deletions
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h index 5ed59ec92534..61bf2ebee3ba 100644 --- a/arch/x86/include/asm/kvm_emulate.h +++ b/arch/x86/include/asm/kvm_emulate.h @@ -109,6 +109,8 @@ struct x86_emulate_ops { unsigned int bytes, struct kvm_vcpu *vcpu); + bool (*get_cpuid)(struct x86_emulate_ctxt *ctxt, + u32 *eax, u32 *ebx, u32 *ecx, u32 *edx); }; /* Type, address-of, and value of an instruction's operand. */ diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index df1cefb9457d..23b5a71fbc54 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -2871,12 +2871,35 @@ void kvm_report_emulation_failure(struct kvm_vcpu *vcpu, const char *context) } EXPORT_SYMBOL_GPL(kvm_report_emulation_failure); +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(ctxt->vcpu, + *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, .fetch = kvm_fetch_guest_virt, .read_emulated = emulator_read_emulated, .write_emulated = emulator_write_emulated, .cmpxchg_emulated = emulator_cmpxchg_emulated, + .get_cpuid = emulator_get_cpuid, }; static void cache_all_regs(struct kvm_vcpu *vcpu) |