Debugging virtiofs

[Popog]

I can't seem to start a VM with virtiofs. Everything is running as root
(unraid) with a pretty simple setup:

<filesystem type='mount' accessmode='passthrough'>
    <driver type='virtiofs'/>
    <binary path='/usr/libexec/virtiofsd' />
    <source dir='/mnt/user/shared'/>
    <target dir='shared_mount'/>
</filesystem>

Even with debug logging at max, all I get in the main log is:

qemu-system-x86_64: -device
vhost-user-fs-pci,chardev=chr-vu-fs0,tag=shared_mount,bus=pci.5,addr=0x0:
Failed to write msg. Wrote -1 instead of 12.
qemu-system-x86_64: -device
vhost-user-fs-pci,chardev=chr-vu-fs0,tag=shared_mount,bus=pci.5,addr=0x0:
vhost_dev_init failed: Operation not permitted
shutting down, reason=failed

And in the fsd log:

[ID: 00029648] virtio_session_mount: Waiting for vhost-user socket
connection...
[ID: 00029648] virtio_session_mount: Received vhost-user socket connection
[ID: 00000001] pivot_root(., .): Invalid argument

Nothing else in any other logs (e.g. dmesg). What do these errors mean? How
do I troubleshoot this?
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