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List:       libvirt-users
Subject:    Debugging virtiofs
From:       Popog <popog42 () gmail ! com>
Date:       2020-11-26 22:18:10
Message-ID: CADeUssT8_tOn4nfJWmpMcjZhO_iwQ32EKHxZ06iZTpB=hyN_Zw () mail ! gmail ! com
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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?

[Attachment #3 (text/html)]

<div dir="ltr"><div>I can&#39;t seem to start a VM with virtiofs. Everything is \
running as root (unraid) with a pretty simple \
setup:</div><div><br></div><div>&lt;filesystem type=&#39;mount&#39; \
accessmode=&#39;passthrough&#39;&gt;<br>      &lt;driver \
type=&#39;virtiofs&#39;/&gt;<br>      &lt;binary \
path=&#39;/usr/libexec/virtiofsd&#39; /&gt;<br>      &lt;source \
dir=&#39;/mnt/user/shared&#39;/&gt;<br>      &lt;target \
dir=&#39;shared_mount&#39;/&gt;<br>&lt;/filesystem&gt;</div><div><br></div><div>Even \
with debug logging at max, all I get in the main log \
is:</div><div><br></div><div>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.<br>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<br>shutting down, \
reason=failed</div><div><br></div><div>And in the fsd log:</div><div><br>[ID: \
00029648] virtio_session_mount: Waiting for vhost-user socket connection...<br>[ID: \
00029648] virtio_session_mount: Received vhost-user socket connection<br>[ID: \
00000001] pivot_root(., .): Invalid argument</div><div><br></div><div>Nothing else in \
any other logs (e.g. dmesg). What do these errors mean? How do I troubleshoot \
this?<br></div></div>



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