please virtiofs support

[532910]

initramfs: Parameter root=root unsupported (only /dev/, 0xMAJMIN and UUID= are  supported)

[532910]

workaround: serve virtiofs with tag name as exising file in /dev (/dev/null) and boot with rootfstype=virtiofs root=/dev/null

libvirt:

<cmdline>rootfstype=virtiofs root=/dev/null ro console=ttyS0,115200n8 net.ifnames=0</cmdline>

<filesystem type='mount' accessmode='passthrough'>
  <driver type='virtiofs'/>
  <source dir='/srv/foreign/bullseye'/>
  <target dir='/dev/null'/>
  <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
</filesystem>