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| author | Tom Lendacky <thomas.lendacky@amd.com> | 2018-05-10 22:06:39 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-05-22 16:58:04 +0200 |
| commit | b965592a07a248ef254d9d421bd34a6b548db21f (patch) | |
| tree | 62833118d2b8bcb6eb575a8ee0e6931a2647cc04 /arch/x86/kvm/cpuid.h | |
| parent | b0ef8c72b3d70505ba7fd72af6b1e3fc9b3ae9bc (diff) | |
| download | linux-stable-b965592a07a248ef254d9d421bd34a6b548db21f.tar.gz linux-stable-b965592a07a248ef254d9d421bd34a6b548db21f.tar.bz2 linux-stable-b965592a07a248ef254d9d421bd34a6b548db21f.zip | |
KVM: SVM: Implement VIRT_SPEC_CTRL support for SSBD
commit bc226f07dcd3c9ef0b7f6236fe356ea4a9cb4769 upstream
Expose the new virtualized architectural mechanism, VIRT_SSBD, for using
speculative store bypass disable (SSBD) under SVM. This will allow guests
to use SSBD on hardware that uses non-architectural mechanisms for enabling
SSBD.
[ tglx: Folded the migration fixup from Paolo Bonzini ]
Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86/kvm/cpuid.h')
| -rw-r--r-- | arch/x86/kvm/cpuid.h | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.h b/arch/x86/kvm/cpuid.h index eb47c37db15f..c38369781239 100644 --- a/arch/x86/kvm/cpuid.h +++ b/arch/x86/kvm/cpuid.h @@ -190,6 +190,15 @@ static inline bool guest_cpuid_has_arch_capabilities(struct kvm_vcpu *vcpu) return best && (best->edx & bit(X86_FEATURE_ARCH_CAPABILITIES)); } +static inline bool guest_cpuid_has_virt_ssbd(struct kvm_vcpu *vcpu) +{ + struct kvm_cpuid_entry2 *best; + + best = kvm_find_cpuid_entry(vcpu, 0x80000008, 0); + return best && (best->ebx & bit(X86_FEATURE_VIRT_SSBD)); +} + + /* * NRIPS is provided through cpuidfn 0x8000000a.edx bit 3 |