On 2023/10/10 16:24, Tian, Kevin wrote:
From: Liu, Yi L <yi.l.liu@xxxxxxxxx>
Sent: Monday, October 9, 2023 4:51 PM
From: Kevin Tian <kevin.tian@xxxxxxxxx>
SIOV devices allows driver to tag different PASIDs for the virtual devices
within it. Such driver should call iommufd_device_bind_pasid() to connect
the pasid of the device to iommufd, and then driver is able to attach the
virtual device to IOAS/HWPT with the iommufd_device_attach() API.
Unlike physical devices, for SIOV virtual devices, iommufd_device_attach()
eventually uses the idev->default_pasid when the virtual device is attached
s/default_pasid/rid_pasid/? or just call it idev->pasid. 'default' adds slight
confusion instead...
then let's use rid_pasid as it is used as vRID for virtual device.
to an IOAS/HWPT. Also, there is no need to do immediate_attach per iommu
domain allocation in the attach/replace path if any iommu domain allocation
happens since the attach/replace is eventually pasid attach/replace.
immediate_attach rationale belongs to earlier pasid attach series when
iommufd_device_pasid_attach() was introduced. Not here.
sure, will drop it.
--
Regards,
Yi Liu
