On 6/13/2022 8:24 AM, Suravee Suthikulpanit wrote:
@@ -3543,3 +3537,30 @@ int amd_iommu_pc_set_reg(struct amd_iommu *iommu, u8
bank, u8 cntr, u8 fxn, u64
return iommu_pc_get_set_reg(iommu, bank, cntr, fxn, value, true);
}
+
+bool iommu_sev_snp_supported(void)
+{
+ /*
+ * The SEV-SNP support requires that IOMMU must be enabled, and is
+ * not configured in the passthrough mode.
+ */
+ if (no_iommu || iommu_default_passthrough()) {
+ pr_err("SEV-SNP: IOMMU is either disabled or configured in
passthrough mode.\n");
+ return false;
+ }
+
+ amd_iommu_snp_en = amd_iommu_snp_sup;
+ if (amd_iommu_snp_en)
+ pr_info("SNP enabled\n");
+
+ /* Enforce IOMMU v1 pagetable when SNP is enabled. */
+ if ((amd_iommu_pgtable != AMD_IOMMU_V1) &&
+ amd_iommu_snp_en) {
+ pr_info("Force to using AMD IOMMU v1 page table due to SNP\n");
+ amd_iommu_pgtable = AMD_IOMMU_V1;
+ amd_iommu_ops.pgsize_bitmap = AMD_IOMMU_PGSIZES;
+ }
+
+ return amd_iommu_snp_en;
+}
+EXPORT_SYMBOL_GPL(iommu_sev_snp_supported);
I need to guard this function w/ #ifdef CONFIG_AMD_MEM_ENCRYPT to prevent build
error when CONFIG_AMD_MEM_ENCRYPT=n.
I will send out v2 to fix this.
Best Regards,
Suravee
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