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

[Baolu Lu]

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.

Best regards,
baolu