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Message-Id: <20200915140647.715245510@linuxfoundation.org>
Date: Tue, 15 Sep 2020 16:12:54 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Joerg Roedel <jroedel@...e.de>,
Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.4 072/132] iommu/amd: Do not use IOMMUv2 functionality when SME is active
From: Joerg Roedel <jroedel@...e.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@...e.de>
Link: https://lore.kernel.org/r/20200824105415.21000-3-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.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
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