[PATCH 1/2] x86/cpufeatures: Add the Virtual SPEC_CTRL feature

[Babu Moger]

Newer AMD processors have a feature to virtualize the use of the SPEC_CTRL
MSR. This feature is identified via CPUID 0x8000000A_EDX[20]. When present,
the SPEC_CTRL MSR is automatically virtualized and no longer requires
hypervisor intervention.

Signed-off-by: Babu Moger <babu.moger@xxxxxxx>
---
 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..d649ac5ed7c7 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*/