Messages in this thread | | | Date | Tue, 28 Mar 2023 12:55:16 +0800 | Subject | Re: [PATCH v2 1/8] iommu/vt-d: Use non-privileged mode for all PASIDs | From | Baolu Lu <> |
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On 3/28/23 7:21 AM, 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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