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From: Babu Moger <babu.moger@amd.com>
To: pbonzini@redhat.com, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de
Cc: 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: [PATCH v2 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature
Date: Tue, 22 Dec 2020 16:31:32 -0600	[thread overview]
Message-ID: <160867629293.3471.18225691185459839634.stgit@bmoger-ubuntu> (raw)
In-Reply-To: <160867624053.3471.7106539070175910424.stgit@bmoger-ubuntu>

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*/


  reply	other threads:[~2020-12-22 22:33 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 ` Babu Moger [this message]
2020-12-30  7:15   ` [PATCH v2 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature Borislav Petkov
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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