RE: [RFC 8/8] iommu/vt-d: Add set_dev_pasid callback for nested domain

[Tian, Kevin]

> From: Baolu Lu <baolu.lu@xxxxxxxxxxxxxxx>
> Sent: Wednesday, September 27, 2023 3:58 PM
> 
> On 2023/9/27 15:52, Tian, Kevin wrote:
> >> From: Liu, Yi L<yi.l.liu@xxxxxxxxx>
> >> Sent: Tuesday, September 26, 2023 5:27 PM
> >>
> >> From: Lu Baolu<baolu.lu@xxxxxxxxxxxxxxx>
> >>
> >> This allows the upper layers to set a nested type domain to a PASID of a
> >> device if the PASID feature is supported by the IOMMU hardware.
> >>
> >> Signed-off-by: Lu Baolu<baolu.lu@xxxxxxxxxxxxxxx>
> >> Signed-off-by: Yi Liu<yi.l.liu@xxxxxxxxx>
> >> ---
> >>   drivers/iommu/intel/nested.c | 47
> >> ++++++++++++++++++++++++++++++++++++
> >>   1 file changed, 47 insertions(+)
> > pasid can be attached to either user hwpt or kernel hwpt.
> >
> > We should also introduce a set_dev_pasid callback for non-nest domain
> ops.
> 
> We already have the code in Linus' tree. The idxd driver uses it for
> kernel DMA with pasid.
> 

ah, I forgot. 😊 probably can mention it in the commit message.