From: Babu Moger Date: Fri, 29 Jan 2021 00:43:22 +0000 (-0600) Subject: x86/cpufeatures: Add the Virtual SPEC_CTRL feature X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=f333374e108e7e4c;p=uclinux-h8%2Flinux.git x86/cpufeatures: Add the Virtual SPEC_CTRL feature 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 present, the SPEC_CTRL MSR is automatically virtualized. Signed-off-by: Babu Moger Acked-by: Borislav Petkov Message-Id: <161188100272.28787.4097272856384825024.stgit@bmoger-ubuntu> Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h index cc96e26d69f7..12c4a13b22d8 100644 --- a/arch/x86/include/asm/cpufeatures.h +++ b/arch/x86/include/asm/cpufeatures.h @@ -336,6 +336,7 @@ #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 */ #define X86_FEATURE_SVME_ADDR_CHK (15*32+28) /* "" SVME addr check */ /* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */