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Date: Wed, 30 Dec 2020 08:15:41 +0100 From: Borislav Petkov <bp@...en8.de> To: Babu Moger <babu.moger@....com> Cc: pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com, fenghua.yu@...el.com, tony.luck@...el.com, wanpengli@...cent.com, kvm@...r.kernel.org, thomas.lendacky@....com, peterz@...radead.org, seanjc@...gle.com, joro@...tes.org, x86@...nel.org, kyung.min.park@...el.com, linux-kernel@...r.kernel.org, krish.sadhukhan@...cle.com, hpa@...or.com, mgross@...ux.intel.com, vkuznets@...hat.com, kim.phillips@....com, wei.huang2@....com, jmattson@...gle.com Subject: Re: [PATCH v2 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature 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@....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@...e.de> -- Regards/Gruss, Boris. https://people.kernel.org/tglx/notes-about-netiquette
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