Test against below pkgs:
qemu-kvm-7.0.0-4.el9.x86_64
kernel-5.14.0-102.mr717_220531_1632.el9.x86_64(host & VM)

scenario tested:
1) Boot rhel 9.1 VM with virtio-vga and blob enabled:
/usr/libexec/qemu-kvm \
-name guest=rhel91_1,debug-threads=on \
-machine pc-q35-rhel9.0.0,usb=off,dump-guest-core=off,memory-backend=pc.ram \
-accel kvm \
-cpu Cooperlake,ss=on,vmx=on,pdcm=on,hypervisor=on,tsc-adjust=on,mpx=on,umip=on,md-clear=on,xsaves=on,ibpb=on,ibrs=on,amd-stibp=on,amd-ssbd=on,hle=off,rtm=off,avx512f=off,avx512dq=off,clwb=off,avx512cd=off,avx512bw=off,avx512vl=off,avx512vnni=off,avx512-bf16=off,taa-no=off \
-m 4096 \
-object '{"qom-type":"memory-backend-memfd","id":"pc.ram","x-use-canonical-path-for-ramblock-id":false,"size":4294967296}' \
-overcommit mem-lock=off \
-smp 4,sockets=1,dies=1,cores=4,threads=1 \
-uuid d4d5612d-4396-45d6-8164-bb124b83b591 \
-no-user-config \
-nodefaults \
-rtc base=utc,driftfix=slew \
-global kvm-pit.lost_tick_policy=delay \
-no-hpet \
-no-shutdown \
-global ICH9-LPC.disable_s3=1 \
-global ICH9-LPC.disable_s4=1 \
-boot strict=on \
-device '{"driver":"pcie-root-port","port":16,"chassis":1,"id":"pci.1","bus":"pcie.0","multifunction":true,"addr":"0x2"}' \
-device '{"driver":"pcie-root-port","port":17,"chassis":2,"id":"pci.2","bus":"pcie.0","addr":"0x2.0x1"}' \
-device '{"driver":"pcie-root-port","port":18,"chassis":3,"id":"pci.3","bus":"pcie.0","addr":"0x2.0x2"}' \
-device '{"driver":"pcie-root-port","port":19,"chassis":4,"id":"pci.4","bus":"pcie.0","addr":"0x2.0x3"}' \
-device '{"driver":"pcie-root-port","port":20,"chassis":5,"id":"pci.5","bus":"pcie.0","addr":"0x2.0x4"}' \
-device '{"driver":"pcie-root-port","port":21,"chassis":6,"id":"pci.6","bus":"pcie.0","addr":"0x2.0x5"}' \
-device '{"driver":"ich9-usb-ehci1","id":"usb","bus":"pcie.0","addr":"0x1d.0x7"}' \
-device '{"driver":"ich9-usb-uhci1","masterbus":"usb.0","firstport":0,"bus":"pcie.0","multifunction":true,"addr":"0x1d"}' \
-device '{"driver":"ich9-usb-uhci2","masterbus":"usb.0","firstport":2,"bus":"pcie.0","addr":"0x1d.0x1"}' \
-device '{"driver":"ich9-usb-uhci3","masterbus":"usb.0","firstport":4,"bus":"pcie.0","addr":"0x1d.0x2"}' \
-device '{"driver":"virtio-scsi-pci","id":"scsi0","bus":"pci.2","addr":"0x0"}' \
-device '{"driver":"virtio-serial-pci","id":"virtio-serial0","bus":"pci.3","addr":"0x0"}' \
-blockdev '{"driver":"file","filename":"/home/rhel91_1.qcow2","node-name":"libvirt-1-storage","cache":{"direct":true,"no-flush":false},"auto-read-only":true,"discard":"unmap"}' \
-blockdev '{"node-name":"libvirt-1-format","read-only":false,"cache":{"direct":true,"no-flush":false},"driver":"raw","file":"libvirt-1-storage"}' \
-device '{"driver":"scsi-hd","bus":"scsi0.0","channel":0,"scsi-id":0,"lun":0,"device_id":"drive-scsi0-0-0-0","drive":"libvirt-1-format","id":"scsi0-0-0-0","bootindex":1,"write-cache":"on"}' \
-audiodev '{"id":"audio1","driver":"none"}' \
-vnc 0.0.0.0:0,audiodev=audio1 \
-device '{"driver":"virtio-vga","id":"video0","blob":true,"max_outputs":1,"bus":"pcie.0","addr":"0x1"}' \
-device '{"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.4","addr":"0x0"}' \
-object '{"qom-type":"rng-random","id":"objrng0","filename":"/dev/urandom"}' \
-device '{"driver":"virtio-rng-pci","rng":"objrng0","id":"rng0","bus":"pci.5","addr":"0x0"}' \
-monitor stdio \

After vm boot, desktop display normally and can find dmesg show blob enabled.

2) Boot rhel 9.1 VM with virtio-vga and blob enabled and 2M huge page:
...
-m 4096 \
-object '{"qom-type":"memory-backend-memfd","id":"pc.ram","hugetlb":true,"hugetlbsize":1073741824,"x-use-canonical-path-for-ramblock-id":false,"prealloc":true,"size":4294967296}' \
-overcommit mem-lock=off \
...
-device '{"driver":"virtio-vga","id":"video0","blob":true,"max_outputs":1,"bus":"pcie.0","addr":"0x1"}' \
...
After vm boot, desktop display normally and can find dmesg show blob enabled.

3) Boot windows 11 VM with virtio-vga and blob enabled, windows VM works normally.

I have performed final verification against virtio vga blob and function works normally. Mark this verified

Can we close this now that RHEL 9.1 has been released?

(In reply to Thomas Huth from comment #20)
> Can we close this now that RHEL 9.1 has been released?

Done!