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authorJoerg Roedel <jroedel@suse.de>2020-08-24 12:54:15 +0200
committerJoerg Roedel <jroedel@suse.de>2020-09-04 12:07:08 +0200
commit2822e582501b65707089b097e773e6fd70774841 (patch)
treebd28e8837fcb61baed583a7b4486aa57121965c3 /drivers
parent7cad554887f1c5fd77e57e6bf4be38370c2160cb (diff)
downloadlinux-2822e582501b65707089b097e773e6fd70774841.tar.bz2
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>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/iommu/amd/iommu_v2.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/iommu/amd/iommu_v2.c b/drivers/iommu/amd/iommu_v2.c
index c259108ab6dd..0d175aed1d92 100644
--- a/drivers/iommu/amd/iommu_v2.c
+++ b/drivers/iommu/amd/iommu_v2.c
@@ -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;