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

On 2023/9/27 15:52, Tian, Kevin wrote:

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From: Liu, Yi Lyi.l.liu@intel.com Sent: Tuesday, September 26, 2023 5:27 PM

From: Lu Baolubaolu.lu@linux.intel.com

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 Baolubaolu.lu@linux.intel.com Signed-off-by: Yi Liuyi.l.liu@intel.com

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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