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

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[ Upstream commit 2822e582501b65707089b097e773e6fd70774841 ]

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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Joerg Roedel 2020-08-24 12:54:15 +02:00 • committed by Greg Kroah-Hartman
commit f12ce53f4d
1 changed files with 7 additions and 0 deletions
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7
drivers/iommu/amd_iommu_v2.c
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@ -776,6 +776,13 @@ 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;