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From: Borislav Petkov <bp@alien8.de>
To: Babu Moger <babu.moger@amd.com>
Cc: pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com,
	fenghua.yu@intel.com, tony.luck@intel.com, wanpengli@tencent.com,
	kvm@vger.kernel.org, thomas.lendacky@amd.com,
	peterz@infradead.org, seanjc@google.com, joro@8bytes.org,
	x86@kernel.org, kyung.min.park@intel.com,
	linux-kernel@vger.kernel.org, krish.sadhukhan@oracle.com,
	hpa@zytor.com, mgross@linux.intel.com, vkuznets@redhat.com,
	kim.phillips@amd.com, wei.huang2@amd.com, jmattson@google.com
Subject: Re: [PATCH v2 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature
Date: Wed, 30 Dec 2020 08:15:41 +0100	[thread overview]
Message-ID: <20201230071541.GC22022@zn.tnic> (raw)
In-Reply-To: <160867629293.3471.18225691185459839634.stgit@bmoger-ubuntu>

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>

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette

  reply	other threads:[~2020-12-30  7:16 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-22 22:31 [PATCH v2 0/2] x86: Add the feature Virtual SPEC_CTRL Babu Moger
2020-12-22 22:31 ` [PATCH v2 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature Babu Moger
2020-12-30  7:15   ` Borislav Petkov [this message]
2020-12-22 22:31 ` [PATCH v2 2/2] KVM: SVM: Add support for Virtual SPEC_CTRL Babu Moger
2020-12-30  7:15   ` Borislav Petkov
2020-12-30 16:08     ` Sean Christopherson
2021-01-04 18:37       ` Babu Moger
2021-01-04 15:47   ` Tom Lendacky
2021-01-04 18:35     ` Babu Moger

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