You're right. After I manually load vfio_iommu_type1, the error is gone.
** Changed in: qemu
Status: New => Invalid
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https://bugs.launchpad.net/bugs/1529187
Title:
vfio
You've somehow managed to not load the vfio_iommu_type1 module. The
vfio module will request it when loading, if the module is not available
when loading, such as from an initramfs that does not include the full
set of vfio modules, it will need to be loaded later manually.
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