From: Zhenzhong Duan <zhenzhong.d...@intel.com> The nested IOMMU support needs device and hwpt id which are generated only after attachment. Hiod encapsulates these information in realize() and passes to vIOMMU.
Suggested-by: Cédric Le Goater <c...@redhat.com> Signed-off-by: Zhenzhong Duan <zhenzhong.d...@intel.com> Reviewed-by: Cédric Le Goater <c...@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250521110301.3313877-1-zhenzhong.d...@intel.com Signed-off-by: Cédric Le Goater <c...@redhat.com> --- hw/vfio/iommufd.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c index af1c7ab10a090a2a4a2913231fc50903be9fb0f1..6b2696793f82fd68c306b85407b5f98201b9f5c6 100644 --- a/hw/vfio/iommufd.c +++ b/hw/vfio/iommufd.c @@ -592,6 +592,10 @@ found_container: goto err_listener_register; } + /* + * Do not move this code before attachment! The nested IOMMU support + * needs device and hwpt id which are generated only after attachment. + */ if (!vfio_device_hiod_create_and_realize(vbasedev, TYPE_HOST_IOMMU_DEVICE_IOMMUFD_VFIO, errp)) { goto err_listener_register; -- 2.49.0
