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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>
This commit is contained in:
Suravee Suthikulpanit 2022-07-13 17:56:51 -05:00 committed by Joerg Roedel
parent 8388f7df93
commit 30315e71b4
1 changed files with 6 additions and 1 deletions
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7
drivers/iommu/amd/init.c
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@ -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);