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iommu/amd: Do not use IOMMUv2 functionality when SME is active 

When memory encryption is active the device is likely not in a direct
mapped domain. Forbid using IOMMUv2 functionality for now until finer
grained checks for this have been implemented.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200824105415.21000-3-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-08-24 12:54:15 +02:00
parent 7cad554887
commit 2822e58250
1 changed files with 7 additions and 0 deletions
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7
drivers/iommu/amd/iommu_v2.c
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@ -737,6 +737,13 @@ int amd_iommu_init_device(struct pci_dev *pdev, int pasids)
might_sleep();
/*
* When memory encryption is active the device is likely not in a
* direct-mapped domain. Forbid using IOMMUv2 functionality for now.
*/
if (mem_encrypt_active())
return -ENODEV;
if (!amd_iommu_v2_supported())
return -ENODEV;