[Virtio-fs] vm hangs when booting with virtiofs

[German Maglione]

Hi,

On Sat, May 20, 2023 at 12:15 PM daggs <daggs at gmx.com> wrote:

> Greetings,
>
> I'm trying to boot a win11 vm with a virtiofs fs and the system just hangs
> on boot, I'd like some incites on what is the issue.
> here is what I'm using:
> - kernel 6.3.3
> - libvirt 9.3.0
> - qemu 8.0.0
> - virtiofsd 1.5.1
>

If you swap your win11 for a linux guest (using the same libvirt xml) are
you able to reproduce the error?


>
> I'm using the following cmd to run virtiofsd using socket: virtiofsd
> --socket-path=/var/lib/libvirt/helpers_state/windows/linux_home.socket
> --shared-dir /home/daggs --cache auto
> where /var/lib/libvirt/helpers_state/windows/ is a tmpfs mount of 16K
> (tried with 1M too, same behavior)
> the virtiofsd invocation is issued inside the prepare and begin qemu hook
> on libvirt.
> I see this after virtiofsd is started: [2023-05-20T08:41:18Z INFO
> virtiofsd] Waiting for vhost-user socket connection...
> and I call it like this: nohup <virtiofsd cmd> &
>
> the vm's relevant config is this:
> <domain type='kvm'>
> ...
> <memory unit='KiB'>24582144</memory>
> <currentMemory unit='KiB'>24582144</currentMemory>
> <memoryBacking>
> <source type='memfd'/>
> <access mode='shared'/>
> </memoryBacking>
> <vcpu placement='static'>12</vcpu>
> <cputune>
> <vcpupin vcpu='0' cpuset='4'/>
> <vcpupin vcpu='1' cpuset='5'/>
> <vcpupin vcpu='2' cpuset='6'/>
> <vcpupin vcpu='3' cpuset='7'/>
> <vcpupin vcpu='4' cpuset='8'/>
> <vcpupin vcpu='5' cpuset='9'/>
> <vcpupin vcpu='6' cpuset='10'/>
> <vcpupin vcpu='7' cpuset='11'/>
> <vcpupin vcpu='8' cpuset='12'/>
> <vcpupin vcpu='9' cpuset='13'/>
> <vcpupin vcpu='10' cpuset='14'/>
> <vcpupin vcpu='11' cpuset='15'/>
> <emulatorpin cpuset='0-1'/>
> </cputune>
>
> ...
> <cpu mode='host-passthrough' check='none' migratable='on'>
> <topology sockets='1' dies='1' cores='6' threads='2'/>
> <cache mode='passthrough'/>
> <feature policy='require' name='topoext'/>
> </cpu>
> ...
> <filesystem type='mount' accessmode='passthrough'>
> <driver type='virtiofs' queue='1024'/>
> <binary path='/usr/bin/virtiofsd'/>
> <source socket='/var/lib/libvirt/helpers_state/windows/linux_home.socket'/>
> <target dir='linux_home'/>
> <address type='pci' domain='0x0000' bus='0x07' slot='0x00' function='0x0'/>
> </filesystem>
> ...
> </domain>
>
> I'm running it via virsh, added -d 4, no errors in the log
> when it is stuck, I get a black screen (using gpu pt to guest which work
> without it), ps shows both virsh start cmd running and stuck, two virtiofsd
> instances are up.
> any ideas how to solve this?
>
> Thanks,
>
> Dagg
>
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>
>

-- 
German
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