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

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On 2023/9/27 16:09, Tian, Kevin wrote:
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.

sure.

--
Regards,
Yi Liu



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