On 11.04.2021 02:06, Chris Murphy wrote: > Right. The block device (partition containing the Btrfs file system) > must be exclusively used by one kernel, host or guest. Dom0 or DomU. > Can't be both. > > The only exception I'm aware of is virtiofs or virtio-9p, but I > haven't messed with that stuff yet. >
There is no exception. Filesystem accessed by virtio-9p is owned by host.