From ce62118a2e4838bcef1050fff55001a0bf87f0cb Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Mon, 27 Oct 2025 14:33:49 -0500 Subject: KVM: SEV: Consolidate the SEV policy bits in a single header file Consolidate SEV policy bit definitions into a single file. Use include/linux/psp-sev.h to hold the definitions and remove the current definitions from the arch/x86/kvm/svm/sev.c and arch/x86/include/svm.h files. No functional change intended. Signed-off-by: Tom Lendacky Link: https://patch.msgid.link/d9639f88a0b521a1a67aeac77cc609fdea1f90bd.1761593632.git.thomas.lendacky@amd.com Signed-off-by: Sean Christopherson --- include/linux/psp-sev.h | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'include/linux') diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index e0dbcb4b4fd9..27c92543bf38 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -14,6 +14,25 @@ #include +/* As defined by SEV API, under "Guest Policy". */ +#define SEV_POLICY_MASK_NODBG BIT(0) +#define SEV_POLICY_MASK_NOKS BIT(1) +#define SEV_POLICY_MASK_ES BIT(2) +#define SEV_POLICY_MASK_NOSEND BIT(3) +#define SEV_POLICY_MASK_DOMAIN BIT(4) +#define SEV_POLICY_MASK_SEV BIT(5) +#define SEV_POLICY_MASK_API_MAJOR GENMASK(23, 16) +#define SEV_POLICY_MASK_API_MINOR GENMASK(31, 24) + +/* As defined by SEV-SNP Firmware ABI, under "Guest Policy". */ +#define SNP_POLICY_MASK_API_MINOR GENMASK_ULL(7, 0) +#define SNP_POLICY_MASK_API_MAJOR GENMASK_ULL(15, 8) +#define SNP_POLICY_MASK_SMT BIT_ULL(16) +#define SNP_POLICY_MASK_RSVD_MBO BIT_ULL(17) +#define SNP_POLICY_MASK_MIGRATE_MA BIT_ULL(18) +#define SNP_POLICY_MASK_DEBUG BIT_ULL(19) +#define SNP_POLICY_MASK_SINGLE_SOCKET BIT_ULL(20) + #define SEV_FW_BLOB_MAX_SIZE 0x4000 /* 16KB */ /** -- cgit v1.2.3 From c9434e64e8b4d17511f514f7495008f573595e3e Mon Sep 17 00:00:00 2001 From: Tom Lendacky Date: Mon, 27 Oct 2025 14:33:50 -0500 Subject: crypto: ccp - Add an API to return the supported SEV-SNP policy bits 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 Acked-by: Herbert Xu Link: https://patch.msgid.link/e3f711366ddc22e3dd215c987fd2e28dc1c07f54.1761593632.git.thomas.lendacky@amd.com Signed-off-by: Sean Christopherson --- drivers/crypto/ccp/sev-dev.c | 37 +++++++++++++++++++++++++++++++++++++ include/linux/psp-sev.h | 18 ++++++++++++++++++ 2 files changed, 55 insertions(+) (limited to 'include/linux') diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c index 0d13d47c164b..db7c7c50cebc 100644 --- a/drivers/crypto/ccp/sev-dev.c +++ b/drivers/crypto/ccp/sev-dev.c @@ -2777,6 +2777,43 @@ void sev_platform_shutdown(void) } EXPORT_SYMBOL_GPL(sev_platform_shutdown); +u64 sev_get_snp_policy_bits(void) +{ + struct psp_device *psp = psp_master; + struct sev_device *sev; + u64 policy_bits; + + if (!cc_platform_has(CC_ATTR_HOST_SEV_SNP)) + return 0; + + if (!psp || !psp->sev_data) + return 0; + + sev = psp->sev_data; + + policy_bits = SNP_POLICY_MASK_BASE; + + if (sev->snp_plat_status.feature_info) { + if (sev->snp_feat_info_0.ecx & SNP_RAPL_DISABLE_SUPPORTED) + policy_bits |= SNP_POLICY_MASK_RAPL_DIS; + + if (sev->snp_feat_info_0.ecx & SNP_CIPHER_TEXT_HIDING_SUPPORTED) + policy_bits |= SNP_POLICY_MASK_CIPHERTEXT_HIDING_DRAM; + + if (sev->snp_feat_info_0.ecx & SNP_AES_256_XTS_POLICY_SUPPORTED) + policy_bits |= SNP_POLICY_MASK_MEM_AES_256_XTS; + + if (sev->snp_feat_info_0.ecx & SNP_CXL_ALLOW_POLICY_SUPPORTED) + policy_bits |= SNP_POLICY_MASK_CXL_ALLOW; + + if (sev_version_greater_or_equal(1, 58)) + policy_bits |= SNP_POLICY_MASK_PAGE_SWAP_DISABLE; + } + + return policy_bits; +} +EXPORT_SYMBOL_GPL(sev_get_snp_policy_bits); + void sev_dev_destroy(struct psp_device *psp) { struct sev_device *sev = psp->sev_data; diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h index 27c92543bf38..abcdee256c65 100644 --- a/include/linux/psp-sev.h +++ b/include/linux/psp-sev.h @@ -32,6 +32,20 @@ #define SNP_POLICY_MASK_MIGRATE_MA BIT_ULL(18) #define SNP_POLICY_MASK_DEBUG BIT_ULL(19) #define SNP_POLICY_MASK_SINGLE_SOCKET BIT_ULL(20) +#define SNP_POLICY_MASK_CXL_ALLOW BIT_ULL(21) +#define SNP_POLICY_MASK_MEM_AES_256_XTS BIT_ULL(22) +#define SNP_POLICY_MASK_RAPL_DIS BIT_ULL(23) +#define SNP_POLICY_MASK_CIPHERTEXT_HIDING_DRAM BIT_ULL(24) +#define SNP_POLICY_MASK_PAGE_SWAP_DISABLE BIT_ULL(25) + +/* Base SEV-SNP policy bitmask for minimum supported SEV firmware version */ +#define SNP_POLICY_MASK_BASE (SNP_POLICY_MASK_API_MINOR | \ + SNP_POLICY_MASK_API_MAJOR | \ + SNP_POLICY_MASK_SMT | \ + SNP_POLICY_MASK_RSVD_MBO | \ + SNP_POLICY_MASK_MIGRATE_MA | \ + SNP_POLICY_MASK_DEBUG | \ + SNP_POLICY_MASK_SINGLE_SOCKET) #define SEV_FW_BLOB_MAX_SIZE 0x4000 /* 16KB */ @@ -868,7 +882,10 @@ struct snp_feature_info { u32 edx; } __packed; +#define SNP_RAPL_DISABLE_SUPPORTED BIT(2) #define SNP_CIPHER_TEXT_HIDING_SUPPORTED BIT(3) +#define SNP_AES_256_XTS_POLICY_SUPPORTED BIT(4) +#define SNP_CXL_ALLOW_POLICY_SUPPORTED BIT(5) #ifdef CONFIG_CRYPTO_DEV_SP_PSP @@ -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 */ -- cgit v1.2.3