diff options
Diffstat (limited to 'drivers/iommu/amd/init.c')
| -rw-r--r-- | drivers/iommu/amd/init.c | 25 |
1 files changed, 13 insertions, 12 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c index 33228c1c8980..ac6754a85f35 100644 --- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -3232,28 +3232,29 @@ static void iommu_snp_enable(void) return; /* * The SNP support requires that IOMMU must be enabled, and is - * not configured in the passthrough mode. + * configured with V1 page table (DTE[Mode] = 0 is not supported). */ if (no_iommu || iommu_default_passthrough()) { - pr_err("SNP: IOMMU disabled or configured in passthrough mode, SNP cannot be supported.\n"); - cc_platform_clear(CC_ATTR_HOST_SEV_SNP); - return; + pr_warn("SNP: IOMMU disabled or configured in passthrough mode, SNP cannot be supported.\n"); + goto disable_snp; + } + + if (amd_iommu_pgtable != AMD_IOMMU_V1) { + pr_warn("SNP: IOMMU is configured with V2 page table mode, SNP cannot be supported.\n"); + goto disable_snp; } amd_iommu_snp_en = check_feature(FEATURE_SNP); if (!amd_iommu_snp_en) { - pr_err("SNP: IOMMU SNP feature not enabled, SNP cannot be supported.\n"); - cc_platform_clear(CC_ATTR_HOST_SEV_SNP); - return; + pr_warn("SNP: IOMMU SNP feature not enabled, SNP cannot be supported.\n"); + goto disable_snp; } pr_info("IOMMU SNP support enabled.\n"); + return; - /* Enforce IOMMU v1 pagetable when SNP is enabled. */ - if (amd_iommu_pgtable != AMD_IOMMU_V1) { - pr_warn("Forcing use of AMD IOMMU v1 page table due to SNP.\n"); - amd_iommu_pgtable = AMD_IOMMU_V1; - } +disable_snp: + cc_platform_clear(CC_ATTR_HOST_SEV_SNP); #endif } |