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.

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