Re: [PATCH v4 2/4] crypto: ccp - Add an API to return the supported SEV-SNP policy bits

Sean Christopherson
2025-11-13T18:52:05Z

On Mon, Oct 27, 2025, Tom Lendacky wrote:
> Supported policy bits are dependent on the level of SEV firmware that is
> currently running. Create an API to return the supported policy bits for
> the current level of firmware.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---

...

> @@ -1014,6 +1031,7 @@ void *snp_alloc_firmware_page(gfp_t mask);
> void snp_free_firmware_page(void *addr);
> void sev_platform_shutdown(void);
> bool sev_is_snp_ciphertext_hiding_supported(void);
> +u64 sev_get_snp_policy_bits(void);
>
> #else /* !CONFIG_CRYPTO_DEV_SP_PSP */
>
> @@ -1052,6 +1070,8 @@ static inline void sev_platform_shutdown(void) { }
>
> static inline bool sev_is_snp_ciphertext_hiding_supported(void) { return false; }
>
> +static inline u64 sev_get_snp_policy_bits(void) { return 0; }

As called out in the RFC[*], this stub is unnecesary.

[*] https://lore.kernel.org/all/aMHP5EO-ucJGdHXz@google.com