> From: Jason Gunthorpe <[email protected]> > Sent: Tuesday, November 4, 2025 2:54 AM > > On Thu, Oct 30, 2025 at 12:43:59PM -0700, Nicolin Chen wrote: > > > FWIW, I am thinking of another design based on Jason's remarks: > > https://lore.kernel.org/linux-iommu/aQBopHFub8wyQh5C@Asurada- > Nvidia/ > > > > So, instead of core initiating the round trip between the blocking > > domain and group->domain, it forwards dev_reset_prepare/done to the > > driver where it does a low-level attachment that wouldn't fail: > > For SMMUv3, it's an STE update. > > For intel_iommu, it seems to be the context table update? > > Kevin, how bad do you think the UAPI issue is if we ignore it? >
yeah probably better to leave it. I didn't see a clean way and the value didn't justify the complexity. Regarding to PF reset, it's a devastating operation while the vf user is operating the vf w/o any awareness. there must be certain coordination in userspace. otherwise nobody can recover the registers. Comparing to that, solving the domain attach problem is less important...
