On Tue, Feb 11, 2020 at 02:51:57PM +0100, Joerg Roedel wrote:
> From: Tom Lendacky <thomas.lendacky@xxxxxxx>
>
> Add CPU feature detection for Secure Encrypted Virtualization with
> Encrypted State. This feature enhances SEV by also encrypting the
> guest register state, making it in-accessible to the hypervisor.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@xxxxxxx>
> Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
> ---
> arch/x86/include/asm/cpufeatures.h | 1 +
> arch/x86/kernel/cpu/amd.c | 4 +++-
> arch/x86/kernel/cpu/scattered.c | 1 +
> 3 files changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
> index f3327cb56edf..26e4ee209f7b 100644
> --- a/arch/x86/include/asm/cpufeatures.h
> +++ b/arch/x86/include/asm/cpufeatures.h
> @@ -285,6 +285,7 @@
> #define X86_FEATURE_CQM_MBM_LOCAL (11*32+ 3) /* LLC Local MBM monitoring */
> #define X86_FEATURE_FENCE_SWAPGS_USER (11*32+ 4) /* "" LFENCE in user entry SWAPGS path */
> #define X86_FEATURE_FENCE_SWAPGS_KERNEL (11*32+ 5) /* "" LFENCE in kernel entry SWAPGS path */
> +#define X86_FEATURE_SEV_ES (11*32+ 6) /* AMD Secure Encrypted Virtualization - Encrypted State */
Let's put this in word 8 which is for virt flags. X86_FEATURE_SEV could
go there too but that should be a separate patch anyway, if at all.
> /* Intel-defined CPU features, CPUID level 0x00000007:1 (EAX), word 12 */
> #define X86_FEATURE_AVX512_BF16 (12*32+ 5) /* AVX512 BFLOAT16 instructions */
> diff --git a/arch/x86/kernel/cpu/amd.c b/arch/x86/kernel/cpu/amd.c
> index ac83a0fef628..aad2223862ef 100644
> --- a/arch/x86/kernel/cpu/amd.c
> +++ b/arch/x86/kernel/cpu/amd.c
> @@ -580,7 +580,7 @@ static void early_detect_mem_encrypt(struct cpuinfo_x86 *c)
> * If BIOS has not enabled SME then don't advertise the
> * SME feature (set in scattered.c).
> * For SEV: If BIOS has not enabled SEV then don't advertise the
> - * SEV feature (set in scattered.c).
> + * SEV and SEV_ES feature (set in scattered.c).
> *
> * In all cases, since support for SME and SEV requires long mode,
> * don't advertise the feature under CONFIG_X86_32.
> @@ -611,6 +611,8 @@ static void early_detect_mem_encrypt(struct cpuinfo_x86 *c)
> setup_clear_cpu_cap(X86_FEATURE_SME);
> clear_sev:
> setup_clear_cpu_cap(X86_FEATURE_SEV);
> + setup_clear_cpu_cap(X86_FEATURE_SEV);
X86_FEATURE_SEV twice? Because once didn't stick?
:-)
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
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