Messages in this thread Patch in this message | | | From | Joerg Roedel <> | Subject | [PATCH 2/2] iommu/amd: Do not use IOMMUv2 functionality when SME is active | Date | Mon, 24 Aug 2020 12:54:15 +0200 |
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From: Joerg Roedel <jroedel@suse.de>
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> --- drivers/iommu/amd/iommu_v2.c | 7 +++++++ 1 file changed, 7 insertions(+)
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; -- 2.28.0
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