Messages in this thread | | | Date | Sat, 1 Apr 2023 21:41:13 +0800 | Subject | Re: [PATCH v3 1/7] iommu/vt-d: Use non-privileged mode for all PASIDs | From | Baolu Lu <> |
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On 2023/4/1 7:11, Jacob Pan wrote: > 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>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Best regards, baolu
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