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| author | Stephan Bärwolf <stephan.baerwolf@tu-ilmenau.de> | 2012-01-12 16:43:03 +0100 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2012-02-01 11:43:33 +0200 |
| commit | bdb42f5afebe208eae90406959383856ae2caf2b (patch) | |
| tree | e58d3b8aedf30b9f42689a7d0ee752600be3f938 /arch/x86/kvm/x86.c | |
| parent | 50e92b3c971129c96a5fffb51dd42691e2ee4004 (diff) | |
| download | lwn-bdb42f5afebe208eae90406959383856ae2caf2b.tar.gz lwn-bdb42f5afebe208eae90406959383856ae2caf2b.zip | |
KVM: x86: extend "struct x86_emulate_ops" with "get_cpuid"
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>
Diffstat (limited to 'arch/x86/kvm/x86.c')
| -rw-r--r-- | arch/x86/kvm/x86.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 14d6cadc4ba6..8c890e2fa6b6 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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) |