iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

iommu/amd: Do not support IOMMUv2 APIs when SNP is enabled

Browse Source 
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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/iommu/amd/init.c
View File

@ -3458,7 +3458,12 @@ __setup("ivrs_acpihid", parse_ivrs_acpihid);
bool amd_iommu_v2_supported(void) 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); EXPORT_SYMBOL(amd_iommu_v2_supported);