[Virtio-fs] vm hangs when booting with virtiofs

[daggs]

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

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