> From: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx> > Sent: Thursday, April 1, 2021 8:05 PM [...] > > Also wondering about: > > * Querying IOMMU nesting capabilities before binding page tables (which > page table formats are supported?). We were planning to have a VFIO cap, > but I'm guessing we need to go back to the sysfs solution? I think it can also be with /dev/ioasid. > > * Invalidation, probably an ioasid_fd ioctl? yeah, if we are doing bind/unbind_pagtable via ioasid_fd, then yes, invalidation should go this way as well. This is why I worried it may fail to meet the requirement from you and Eric. > * Page faults, page response. From and to devices, and don't necessarily > have a PASID. But needed by vdpa as well, so that's also going through > /dev/ioasid? page faults should still be per-device, but the fault event fd may be stored in /dev/ioasid. page response would be in /dev/ioasid just like invalidation. Regards, Yi Liu > > Thanks, > Jean
