On 2/3/23 13:57, Jason Gunthorpe wrote: > On Tue, Jan 31, 2023 at 09:52:47PM +0100, Eric Auger wrote: >> Given some iommufd kernel limitations, the iommufd backend is >> not yuet fully on par with the legacy backend w.r.t. features like: >> - p2p mappings (you will see related error traces) >> - coherency tracking > You said this was a qemu side limitation? yes that's correct. This comment will be removed. > >> - live migration > The vfio kernel interfaces are deprecated, Avihai's series here adds > live migration support: > > https://lore.kernel.org/qemu-devel/20230126184948.10478-1-avihaih@xxxxxxxxxx/ > > And there will be another series for iommufd system iommu based live > migration OK thanks for the pointer. > >> - 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. Thanks Eric > > Jason >
