diff options
| author | Jacob Pan <jacob.jun.pan@linux.intel.com> | 2023-04-13 12:06:37 +0800 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2023-04-13 12:05:49 +0200 |
| commit | a7050fbde36e0634f89d41e6384c140fe4ae011e (patch) | |
| tree | de5a3d55105afabcea4c222e9545e5f72820d3eb /drivers/iommu/intel/iommu.c | |
| parent | a06c2ecec113fa882f48eb71e9d7e8fb520b1c78 (diff) | |
iommu/vt-d: Use non-privileged mode for all PASIDs
Supervisor Request Enable (SRE) bit in a PASID entry is for permission
checking on DMA requests. When SRE = 0, DMA with supervisor privilege
will be blocked. However, for in-kernel DMA this is not necessary in that
we are targeting kernel memory anyway. There's no need to differentiate
user and kernel for in-kernel DMA.
Let's use non-privileged (user) permission for all PASIDs used in kernel,
it will be consistent with DMA without PASID (RID_PASID) as well.
Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com>
Link: https://lore.kernel.org/r/20230331231137.1947675-2-jacob.jun.pan@linux.intel.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu/intel/iommu.c')
| -rw-r--r-- | drivers/iommu/intel/iommu.c | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index c771233d6f2a..f4e536fd5a28 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -2316,8 +2316,6 @@ static int domain_setup_first_level(struct intel_iommu *iommu, if (level != 4 && level != 5) return -EINVAL; - if (pasid != PASID_RID2PASID) - flags |= PASID_FLAG_SUPERVISOR_MODE; if (level == 5) flags |= PASID_FLAG_FL5LP; |