| From f496ac3c6dca868c2110e3ba49a7ebbc37edee24 Mon Sep 17 00:00:00 2001 |
| From: Sasha Levin <sashal@kernel.org> |
| Date: Mon, 24 Aug 2020 12:54:15 +0200 |
| Subject: iommu/amd: Do not use IOMMUv2 functionality when SME is active |
| |
| 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 d6d85debd01b0..05f3d93cf480c 100644 |
| --- a/drivers/iommu/amd_iommu_v2.c |
| +++ b/drivers/iommu/amd_iommu_v2.c |
| @@ -741,6 +741,13 @@ 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; |
| |
| -- |
| 2.25.1 |
| |
