| Message ID | 160867629293.3471.18225691185459839634.stgit@bmoger-ubuntu (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | x86: Add the feature Virtual SPEC_CTRL | expand |
On Tue, Dec 22, 2020 at 04:31:32PM -0600, Babu Moger wrote: > Newer AMD processors have a feature to virtualize the use of the > SPEC_CTRL MSR. Presence of this feature is indicated via CPUID > function 0x8000000A_EDX[20]: GuestSpecCtrl. When preset, the SPEC_CTRL > MSR is automatically virtualized. > > Signed-off-by: Babu Moger <babu.moger@amd.com> > --- > arch/x86/include/asm/cpufeatures.h | 1 + > 1 file changed, 1 insertion(+) > > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h > index dad350d42ecf..aee4a924ecd7 100644 > --- a/arch/x86/include/asm/cpufeatures.h > +++ b/arch/x86/include/asm/cpufeatures.h > @@ -335,6 +335,7 @@ > #define X86_FEATURE_AVIC (15*32+13) /* Virtual Interrupt Controller */ > #define X86_FEATURE_V_VMSAVE_VMLOAD (15*32+15) /* Virtual VMSAVE VMLOAD */ > #define X86_FEATURE_VGIF (15*32+16) /* Virtual GIF */ > +#define X86_FEATURE_V_SPEC_CTRL (15*32+20) /* Virtual SPEC_CTRL */ > > /* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */ > #define X86_FEATURE_AVX512VBMI (16*32+ 1) /* AVX512 Vector Bit Manipulation instructions*/ I'm guessing this will go through the kvm tree so: Acked-by: Borislav Petkov <bp@suse.de>
diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index dad350d42ecf..aee4a924ecd7 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -335,6 +335,7 @@ #define X86_FEATURE_AVIC (15*32+13) /* Virtual Interrupt Controller */ #define X86_FEATURE_V_VMSAVE_VMLOAD (15*32+15) /* Virtual VMSAVE VMLOAD */ #define X86_FEATURE_VGIF (15*32+16) /* Virtual GIF */ +#define X86_FEATURE_V_SPEC_CTRL (15*32+20) /* Virtual SPEC_CTRL */ /* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */ #define X86_FEATURE_AVX512VBMI (16*32+ 1) /* AVX512 Vector Bit Manipulation instructions*/
Newer AMD processors have a feature to virtualize the use of the SPEC_CTRL MSR. Presence of this feature is indicated via CPUID function 0x8000000A_EDX[20]: GuestSpecCtrl. When preset, the SPEC_CTRL MSR is automatically virtualized. Signed-off-by: Babu Moger <babu.moger@amd.com> --- arch/x86/include/asm/cpufeatures.h | 1 + 1 file changed, 1 insertion(+)