[Virtio-fs] vm hangs when booting with virtiofs

[daggs]

Greetings German,

>Sent: Wednesday, May 24, 2023 at 5:47 PM
>From: "German Maglione" <gmaglione at redhat.com>
>To: "daggs" <daggs at gmx.com>
>Cc: virtio-fs at redhat.com
>Subject: Re: [Virtio-fs] vm hangs when booting with virtiofs
>
>Hi, 
>
>>On Sat, May 20, 2023 at 12:15 PM daggs <daggs at gmx.com[mailto: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 haven't tried it.
do you think the guest type matters much?

regardless, I'll try it and report back. thanks

> 
>>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