Comment 5 for bug 1907421

Hi,
You also mentioned qemu in the description, I think what is related (by title and it has your name) is the following series + one fixup:

77280d33b s390x: fix build for --without-default-devices
37fa32de70 s390x/pci: Honor DMA limits set by vfio
cd7498d07f s390x/pci: Add routine to get the vfio dma available count
7486a62845 vfio: Find DMA available capability
3ab7a0b40d vfio: Create shared routine for scanning info capabilities
408b55db8b s390x/pci: Move header files to include/hw/s390x
53ba2eee52 linux-headers: update against 5.10-rc1
84567ea763 update-linux-headers: Add vfio_zdev.h

That is in qemu 5.2 - and if that "is it" then in Hirsute things are already fixed by now.
But that is quite a list and for backports we will need to reduce that to the minimum that is needed. Did you check if you can (or have even a branch somewhere) backport these on top of 4.2 and/or 5.0 ?

Also if this shall be an SRU we would need a testcase, is there anything that can be isolated as test instructions?