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crypto: ccp - Introduce new API interface to indicate SEV-SNP Ciphertext hiding feature

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Implement an API that checks the overall feature support for SEV-SNP
ciphertext hiding.

This API verifies both the support of the SEV firmware for the feature
and its enablement in the platform's BIOS.

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
Reviewed-by: Kim Phillips <kim.phillips@amd.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Ashish Kalra
2025-07-21 14:13:27 +00:00
committed by Herbert Xu
parent 33cfb80d19
commit 45d59bd4a3
2 changed files with 26 additions and 0 deletions
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21
drivers/crypto/ccp/sev-dev.c
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@@ -1074,6 +1074,27 @@ static void snp_set_hsave_pa(void *arg)
wrmsrq(MSR_VM_HSAVE_PA, 0);
}
bool sev_is_snp_ciphertext_hiding_supported(void)
{
struct psp_device *psp = psp_master;
struct sev_device *sev;
if (!psp || !psp->sev_data)
return false;
sev = psp->sev_data;
/*
* Feature information indicates if CipherTextHiding feature is
* supported by the SEV firmware and additionally platform status
* indicates if CipherTextHiding feature is enabled in the
* Platform BIOS.
*/
return ((sev->snp_feat_info_0.ecx & SNP_CIPHER_TEXT_HIDING_SUPPORTED) &&
sev->snp_plat_status.ciphertext_hiding_cap);
}
EXPORT_SYMBOL_GPL(sev_is_snp_ciphertext_hiding_supported);
static int snp_get_platform_data(struct sev_device *sev, int *error)
{
struct sev_data_snp_feature_info snp_feat_info;