diff options
| author | Lu Baolu | 2020-06-23 07:13:41 +0800 |
|---|---|---|
| committer | Joerg Roedel | 2020-06-23 10:08:31 +0200 |
| commit | 16ecf10e815d70d11d2300243f4a3b4c7c5acac7 (patch) | |
| tree | 8b8d41761672fe36743e42d728a90da997e6a94a /include | |
| parent | 9486727f5981a5ec5c0b699fb1777451bd6786e4 (diff) | |
iommu/vt-d: Set U/S bit in first level page table by default
When using first-level translation for IOVA, currently the U/S bit in the
page table is cleared which implies DMA requests with user privilege are
blocked. As the result, following error messages might be observed when
passing through a device to user level:
DMAR: DRHD: handling fault status reg 3
DMAR: [DMA Read] Request device [41:00.0] PASID 1 fault addr 7ecdcd000
[fault reason 129] SM: U/S set 0 for first-level translation
with user privilege
This fixes it by setting U/S bit in the first level page table and makes
IOVA over first level compatible with previous second-level translation.
Fixes: b802d070a52a1 ("iommu/vt-d: Use iova over first level")
Reported-by: Xin Zeng <xin.zeng@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/20200622231345.29722-3-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/intel-iommu.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h index 4100bd224f5c..3e8fa1c7a1e6 100644 --- a/include/linux/intel-iommu.h +++ b/include/linux/intel-iommu.h @@ -41,6 +41,7 @@ #define DMA_PTE_SNP BIT_ULL(11) #define DMA_FL_PTE_PRESENT BIT_ULL(0) +#define DMA_FL_PTE_US BIT_ULL(2) #define DMA_FL_PTE_XD BIT_ULL(63) #define ADDR_WIDTH_5LEVEL (57) |