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| author | Josh Poimboeuf <jpoimboe@kernel.org> | 2023-08-25 10:01:36 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-10-05 01:19:32 +0300 |
| commit | e47d86083c66525b89c7fc66cdd64d5937725563 (patch) | |
| tree | c7a2a4b5ef893299a54ced0955ac5406f6011777 /arch/x86/kvm/cpuid.h | |
| parent | 6f0f23ef76be11bc6ace10df5e807f3542da8772 (diff) | |
| download | linux-e47d86083c66525b89c7fc66cdd64d5937725563.tar.xz | |
KVM: x86: Add SBPB support
Add support for the AMD Selective Branch Predictor Barrier (SBPB) by
advertising the CPUID bit and handling PRED_CMD writes accordingly.
Note, like SRSO_NO and IBPB_BRTYPE before it, advertise support for SBPB
even if it's not enumerated by in the raw CPUID. Some CPUs that gained
support via a uCode patch don't report SBPB via CPUID (the kernel forces
the flag).
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/a4ab1e7fe50096d50fde33e739ed2da40b41ea6a.1692919072.git.jpoimboe@kernel.org
Co-developed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/cpuid.h')
| -rw-r--r-- | arch/x86/kvm/cpuid.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index 284fa4704553..0b90532b6e26 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -174,7 +174,8 @@ static inline bool guest_has_spec_ctrl_msr(struct kvm_vcpu *vcpu) static inline bool guest_has_pred_cmd_msr(struct kvm_vcpu *vcpu) { return (guest_cpuid_has(vcpu, X86_FEATURE_SPEC_CTRL) || - guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB)); + guest_cpuid_has(vcpu, X86_FEATURE_AMD_IBPB) || + guest_cpuid_has(vcpu, X86_FEATURE_SBPB)); } static inline bool supports_cpuid_fault(struct kvm_vcpu *vcpu) |