Comment # 7 on bug 1190326 from Dennis Glindhart

Seems the xen-blkfront module is somehow not available/loaded for the 5.14
kernel.

Kernel 5.13:

# lsmod | grep xen_
xen_netfront           45056  1
xen_blkfront           49152  6

# ls /lib/modules/5.13.13-1-default/kernel/drivers/block | grep xen
xen-blkback
xen-blkfront.ko.xz

Kernel 5.14 (In emergency mode)

# lsmod | grep xen_
xen_netfront           45056  1

# ls /lib/modules/5.14.0-1-default/kernel/drivers/block | grep xen
(empty)