On 4/20/22 06:43, Borislav Petkov wrote: > On Tue, Apr 19, 2022 at 03:53:52PM -0500, Babu Moger wrote: >> The TSC_AUX Virtualization feature allows AMD SEV-ES guests to securely use >> TSC_AUX (auxiliary time stamp counter data) MSR in RDTSCP and RDPID >> instructions. >> >> The TSC_AUX MSR is typically initialized to APIC ID or another unique >> identifier so that software can quickly associate returned TSC value >> with the logical processor. >> >> Add the feature bit and also include it in the kvm for detection. >> >> Signed-off-by: Babu Moger <babu.moger@xxxxxxx> >> Acked-by: Borislav Petkov <bp@xxxxxxx> >> --- >> v2: >> Fixed the text(commented by Boris). >> Added Acked-by from Boris. >> >> v1: >> https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Flore.kernel.org%2Fkvm%2F164937947020.1047063.14919887750944564032.stgit%40bmoger-ubuntu%2F&data=05%7C01%7Cbabu.moger%40amd.com%7Cf826192970c549ae73af08da22c2ff93%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637860518176768607%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C3000%7C%7C%7C&sdata=fExIt5ghvuew%2BXKzGyixye2%2BLQncv91274nt8I0NXbY%3D&reserved=0 >> >> arch/x86/include/asm/cpufeatures.h | 1 + >> arch/x86/kvm/cpuid.c | 2 +- >> 2 files changed, 2 insertions(+), 1 deletion(-) >> >> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h >> index 73e643ae94b6..1bc66a17a95a 100644 >> --- a/arch/x86/include/asm/cpufeatures.h >> +++ b/arch/x86/include/asm/cpufeatures.h >> @@ -405,6 +405,7 @@ >> #define X86_FEATURE_SEV (19*32+ 1) /* AMD Secure Encrypted Virtualization */ >> #define X86_FEATURE_VM_PAGE_FLUSH (19*32+ 2) /* "" VM Page Flush MSR is supported */ >> #define X86_FEATURE_SEV_ES (19*32+ 3) /* AMD Secure Encrypted Virtualization - Encrypted State */ >> +#define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* Virtual TSC_AUX */ > I forgot from the last time: nothing is going to use that bit in > userspace so make that > > #define X86_FEATURE_V_TSC_AUX (19*32+ 9) /* "" Virtual TSC_AUX */ Ok. Sure. Thanks > > please. > > Thx. > -- Thanks Babu Moger
