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| author | Xiao Guangrong <guangrong.xiao@linux.intel.com> | 2015-09-09 14:05:51 +0800 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-10-01 15:06:35 +0200 |
| commit | 8b3e34e46aca9b6d349b331cd9cf71ccbdc91b2e (patch) | |
| tree | e908c0be3a3ea4649fc767df6ad03306e9116edf /arch/x86/kvm/cpuid.h | |
| parent | eb1c31b46800a476644cd63ab3bc7ef918b0a917 (diff) | |
| download | talos-obmc-linux-8b3e34e46aca9b6d349b331cd9cf71ccbdc91b2e.tar.gz talos-obmc-linux-8b3e34e46aca9b6d349b331cd9cf71ccbdc91b2e.zip | |
KVM: x86: add pcommit support
Pass PCOMMIT CPU feature to guest to enable PCOMMIT instruction
Currently we do not catch pcommit instruction for L1 guest and
allow L1 to catch this instruction for L2 if, as required by the spec,
L1 can enumerate the PCOMMIT instruction via CPUID:
| IA32_VMX_PROCBASED_CTLS2[53] (which enumerates support for the
| 1-setting of PCOMMIT exiting) is always the same as
| CPUID.07H:EBX.PCOMMIT[bit 22]. Thus, software can set PCOMMIT exiting
| to 1 if and only if the PCOMMIT instruction is enumerated via CPUID
The spec can be found at
https://software.intel.com/sites/default/files/managed/0d/53/319433-022.pdf
Signed-off-by: Xiao Guangrong <guangrong.xiao@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.h')
| -rw-r--r-- | arch/x86/kvm/cpuid.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index dd05b9cef6ae..aed7bfeeaf0d 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -133,4 +133,12 @@ static inline bool guest_cpuid_has_mpx(struct kvm_vcpu *vcpu) best = kvm_find_cpuid_entry(vcpu, 7, 0); return best && (best->ebx & bit(X86_FEATURE_MPX)); } + +static inline bool guest_cpuid_has_pcommit(struct kvm_vcpu *vcpu) +{ + struct kvm_cpuid_entry2 *best; + + best = kvm_find_cpuid_entry(vcpu, 7, 0); + return best && (best->ebx & bit(X86_FEATURE_PCOMMIT)); +} #endif |
