diff options
| author | Tycho Andersen (AMD) <tycho@kernel.org> | 2026-03-24 19:13:00 +0300 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2026-03-30 13:02:12 +0300 |
| commit | f995fc377ac7d3757e1d94e6403940c4b8f3d76e (patch) | |
| tree | a4e55da32799e29c828e21f1b829cb4e373b316a /include | |
| parent | 7b2bc5f0ab983a7aad7fa5180cede4b3e91fc164 (diff) | |
| download | linux-f995fc377ac7d3757e1d94e6403940c4b8f3d76e.tar.xz | |
crypto/ccp: Implement SNP x86 shutdown
The SEV firmware has support to disable SNP during an SNP_SHUTDOWN_EX command.
Verify that this support is available and set the flag so that SNP is disabled
when it is not being used.
In cases where SNP is disabled, skip the call to amd_iommu_snp_disable(), as
all of the IOMMU pages have already been made shared. Also skip the panic
case, since snp_shutdown() does IPIs.
Signed-off-by: Tycho Andersen (AMD) <tycho@kernel.org>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Acked-by: Herbert Xu <herbert@gondor.apana.org.au>
Link: https://patch.msgid.link/20260324161301.1353976-7-tycho@kernel.org
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/psp-sev.h | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 69ffa4b4d1fa..d5099a2baca5 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -829,12 +829,14 @@ struct sev_data_range_list { * * @len: length of the command buffer read by the PSP * @iommu_snp_shutdown: Disable enforcement of SNP in the IOMMU + * @x86_snp_shutdown: Disable SNP on all cores * @rsvd1: reserved */ struct sev_data_snp_shutdown_ex { u32 len; u32 iommu_snp_shutdown:1; - u32 rsvd1:31; + u32 x86_snp_shutdown:1; + u32 rsvd1:30; } __packed; /** @@ -891,6 +893,7 @@ struct snp_feature_info { } __packed; /* Feature bits in ECX */ +#define SNP_X86_SHUTDOWN_SUPPORTED BIT(1) #define SNP_RAPL_DISABLE_SUPPORTED BIT(2) #define SNP_CIPHER_TEXT_HIDING_SUPPORTED BIT(3) #define SNP_AES_256_XTS_POLICY_SUPPORTED BIT(4) |