From: Joerg Roedel jroedel@suse.de
[ 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 --- 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 58da65df03f5..7a59a8ebac10 100644 --- a/drivers/iommu/amd_iommu_v2.c +++ b/drivers/iommu/amd_iommu_v2.c @@ -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;