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

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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



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