RE: [PATCH 2/2] iommu/vt-d: Avoid unnecessary global DMA cache invalidation

[Tian, Kevin]

> From: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Monday, September 19, 2022 2:25 PM
> 
> Some VT-d hardware implementations invalidate all DMA remapping
> hardware
> translation caches as part of SRTP flow. The VT-d spec adds a ESRTPS
> (Enhanced Set Root Table Pointer Support, section 11.4.2 in VT-d spec)
> capability bit to indicate this. With this bit set, software has no need
> to issue the global invalidation request.
> 
> Signed-off-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>