On Mon, 8 Jul 2024, Jiqian Chen wrote: > If run Xen with PVH dom0 and hvm domU, hvm will map a pirq for > a passthrough device by using gsi, see qemu code > xen_pt_realize->xc_physdev_map_pirq and libxl code > pci_add_dm_done->xc_physdev_map_pirq. Then xc_physdev_map_pirq > will call into Xen, but in hvm_physdev_op, PHYSDEVOP_map_pirq > is not allowed because currd is PVH dom0 and PVH has no > X86_EMU_USE_PIRQ flag, it will fail at has_pirq check. > > So, allow PHYSDEVOP_map_pirq when dom0 is PVH and also allow > PHYSDEVOP_unmap_pirq for the removal device path to unmap pirq. > And add a new check to prevent (un)map when the subject domain > doesn't have a notion of PIRQ. > > So that the interrupt of a passthrough device can be > successfully mapped to pirq for domU with a notion of PIRQ > when dom0 is PVH > > Signed-off-by: Jiqian Chen <jiqian.c...@amd.com> > Signed-off-by: Huang Rui <ray.hu...@amd.com> > Signed-off-by: Jiqian Chen <jiqian.c...@amd.com>
Reviewed-by: Stefano Stabellini <sstabell...@kernel.org>
