On 4/4/24 4:11 PM, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra@xxxxxxx>
>
> Add sev_es_enabled() function to detect if SEV-ES
> support is enabled.
>
> Signed-off-by: Ashish Kalra <ashish.kalra@xxxxxxx>
> ---
Looks good to me.
Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@xxxxxxxxxxxxxxx>
> arch/x86/boot/compressed/sev.c | 5 +++++
> arch/x86/boot/compressed/sev.h | 2 ++
> 2 files changed, 7 insertions(+)
>
> diff --git a/arch/x86/boot/compressed/sev.c b/arch/x86/boot/compressed/sev.c
> index ec71846d28c9..4ae4cc51e6b8 100644
> --- a/arch/x86/boot/compressed/sev.c
> +++ b/arch/x86/boot/compressed/sev.c
> @@ -134,6 +134,11 @@ bool sev_snp_enabled(void)
> return sev_status & MSR_AMD64_SEV_SNP_ENABLED;
> }
>
> +bool sev_es_enabled(void)
> +{
> + return sev_status & MSR_AMD64_SEV_ES_ENABLED;
> +}
> +
> static void __page_state_change(unsigned long paddr, enum psc_op op)
> {
> u64 val;
> diff --git a/arch/x86/boot/compressed/sev.h b/arch/x86/boot/compressed/sev.h
> index fc725a981b09..5008c80e66e6 100644
> --- a/arch/x86/boot/compressed/sev.h
> +++ b/arch/x86/boot/compressed/sev.h
> @@ -11,11 +11,13 @@
> #ifdef CONFIG_AMD_MEM_ENCRYPT
>
> bool sev_snp_enabled(void);
> +bool sev_es_enabled(void);
> void snp_accept_memory(phys_addr_t start, phys_addr_t end);
>
> #else
>
> static inline bool sev_snp_enabled(void) { return false; }
> +static inline bool sev_es_enabled(void) { return false; }
> static inline void snp_accept_memory(phys_addr_t start, phys_addr_t end) { }
>
> #endif
--
Sathyanarayanan Kuppuswamy
Linux Kernel Developer
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