From: Joerg Roedel <joro@8bytes.org>
To: iommu@lists.linux-foundation.org
Cc: Tom Lendacky <thomas.lendacky@amd.com>,
jroedel@suse.de, linux-kernel@vger.kernel.org,
Alexander.Deucher@amd.com
Subject: [PATCH 2/2] iommu/amd: Do not use IOMMUv2 functionality when SME is active
Date: Mon, 24 Aug 2020 12:54:15 +0200 [thread overview]
Message-ID: <20200824105415.21000-3-joro@8bytes.org> (raw)
In-Reply-To: <20200824105415.21000-1-joro@8bytes.org>
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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next prev parent reply other threads:[~2020-08-24 10:54 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-08-24 10:54 [PATCH 0/2] iommu/amd: Fix IOMMUv2 devices when SME is active Joerg Roedel
2020-08-24 10:54 ` [PATCH 1/2] iommu/amd: Do not force direct mapping " Joerg Roedel
2020-08-26 14:23 ` Deucher, Alexander
2020-08-24 10:54 ` Joerg Roedel [this message]
2020-08-26 14:20 ` [PATCH 2/2] iommu/amd: Do not use IOMMUv2 functionality " Deucher, Alexander
2020-08-26 14:14 ` [PATCH 0/2] iommu/amd: Fix IOMMUv2 devices " Deucher, Alexander
2020-08-26 15:22 ` Felix Kuehling
2020-08-26 15:25 ` Deucher, Alexander
2020-08-28 13:46 ` jroedel
2020-08-28 13:54 ` Felix Kuehling
2020-08-28 15:11 ` Deucher, Alexander
2020-08-28 15:29 ` jroedel
2020-08-28 15:47 ` Deucher, Alexander
2020-09-04 10:05 ` Joerg Roedel
2020-09-06 16:08 ` Deucher, Alexander
2020-09-07 10:44 ` Joerg Roedel
2020-09-07 11:10 ` Christian König
2020-09-08 3:38 ` Felix Kuehling
2020-08-28 15:27 ` jroedel
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