openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

iommu/amd: Do not force direct mapping when SME is active 

Do not force devices supporting IOMMUv2 to be direct mapped when memory
encryption is active. This might cause them to be unusable because their
DMA mask does not include the encryption bit.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Link: https://lore.kernel.org/r/20200824105415.21000-2-joro@8bytes.org
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2020-08-24 12:54:14 +02:00
parent e52d58d54a
commit 7cad554887
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/iommu/amd/iommu.c
View File

@ -2659,7 +2659,12 @@ static int amd_iommu_def_domain_type(struct device *dev)
if (!dev_data)
return 0;
if (dev_data->iommu_v2)
/*
* Do not identity map IOMMUv2 capable devices when memory encryption is
* active, because some of those devices (AMD GPUs) don't have the
* encryption bit in their DMA-mask and require remapping.
*/
if (!mem_encrypt_active() && dev_data->iommu_v2)
return IOMMU_DOMAIN_IDENTITY;
return 0;