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vfio/iommufd: Add comment emphasizing no movement of hiod->realize() call

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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 <clg@redhat.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250521110301.3313877-1-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
This commit is contained in:
Zhenzhong Duan 2025-05-21 19:03:01 +08:00 • committed by Cédric Le Goater
parent a483ad5347
commit 1c729ca886
1 changed files with 4 additions and 0 deletions
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4
hw/vfio/iommufd.c
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@ -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;