On Fri, Feb 03, 2023 at 07:03:50PM +0100, Eric Auger wrote: > >> - vfio pci device hot reset > > What is needed here? > > we need to revisit the vfio_pci_hot_reset() implementation in hw/vfio/pci.c > It uses VFIO_DEVICE_GET_PCI_HOT_RESET_INFO and VFIO_DEVICE_PCI_HOT_RESET > uapis > which retrieves/passes the list of iommu groups involved in the reset. > The notion of group had initially disappeared from the the iommufd BE > but I am afraid that's not that simple. >From the kernel side I expected that the device FD would be passed in place of the group FD and like in KVM we'd transform that into a group and run exactly the same algorithm. The kernel cdev series should be doing this. So from the qemu side I would expect it to keep track of all the open VFIO device FD and pass them all into the host rest functions when working in cdev mode. Jason
