Commit 30315e71 authored by Suravee Suthikulpanit's avatar Suravee Suthikulpanit Committed by Joerg Roedel
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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: default avatarSuravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Link: https://lore.kernel.org/r/20220713225651.20758-10-suravee.suthikulpanit@amd.com


Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 8388f7df

drivers/iommu/amd/init.c

+6 −1
Original line number Diff line number Diff line
@@ -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);