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authorSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>2022-07-14 00:56:51 +0200
committerJoerg Roedel <jroedel@suse.de>2022-07-15 10:44:03 +0200
commit30315e71b42603307989d813a620781ff8238f3c (patch)
tree5986f06cddd5952e4f7c495dbe111361e07ca93f /drivers/iommu
parentiommu/amd: Do not support IOMMU_DOMAIN_IDENTITY after SNP is enabled (diff)
downloadlinux-30315e71b42603307989d813a620781ff8238f3c.tar.xz
linux-30315e71b42603307989d813a620781ff8238f3c.zip
iommu/amd: Do not support IOMMUv2 APIs when SNP is enabled
The IOMMUv2 APIs (for supporting shared virtual memory with PASID) configures the domain with IOMMU v2 page table, and sets DTE[Mode]=0. This configuration cannot be supported on SNP-enabled system. Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com> Link: https://lore.kernel.org/r/20220713225651.20758-10-suravee.suthikulpanit@amd.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
-rw-r--r--drivers/iommu/amd/init.c7
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/iommu/amd/init.c b/drivers/iommu/amd/init.c
index 538c750ceed6..d86496114ca5 100644
--- a/drivers/iommu/amd/init.c
+++ b/drivers/iommu/amd/init.c
@@ -3458,7 +3458,12 @@ __setup("ivrs_acpihid", parse_ivrs_acpihid);
bool amd_iommu_v2_supported(void)
{
- return amd_iommu_v2_present;
+ /*
+ * Since DTE[Mode]=0 is prohibited on SNP-enabled system
+ * (i.e. EFR[SNPSup]=1), IOMMUv2 page table cannot be used without
+ * setting up IOMMUv1 page table.
+ */
+ return amd_iommu_v2_present && !amd_iommu_snp_en;
}
EXPORT_SYMBOL(amd_iommu_v2_supported);