Re: [PATCH v4 0/5] iommu/vt-d: Add page request draining support

[Lu Baolu]

Hi Kevin,

Thanks a lot for reviewing.

On 2020/5/7 14:38, Tian, Kevin wrote:
> > From: Lu Baolu<baolu.lu@xxxxxxxxxxxxxxx>
> > Sent: Thursday, May 7, 2020 8:55 AM
> >
> > When a PASID is stopped or terminated, there can be pending PRQs
> > (requests that haven't received responses) in the software and
> > remapping hardware. The pending page requests must be drained
> > so that the pasid could be reused. The chapter 7.10 in the VT-d
> > specification specifies the software steps to drain pending page
> > requests and responses.
> >
> > This includes two parts:
> >   - PATCH 1/4 ~ 2/4: refactor the qi_submit_sync() to support multiple
> >     descriptors per submission which will be used in the following
> >     patch.
> >   - PATCH 3/4 ~ 4/4: add page request drain support after a pasid entry
> >     is torn down.
> I think you should mention that this series depends on Jacob's nested
> SVA series.

Yes. It's based on Jacob's vSVA series since guest unbind also requires
prq draining.

Best regards,
baolu