Re: microvm and Virtio-fs (vhost-user-fs-pci)

[Paul Menzel]

Dear Philippe,


Am 01.06.21 um 05:25 schrieb Philippe Mathieu-Daudé:

> On 5/31/21 8:04 PM, Paul Menzel wrote:

> > For minimal boot time I would like to use the machine type *microvm*
> > [1]. For an application, we would like to use Virtio-fs [2]. Currently
> > it fails with:
> >
> >      $ sudo qemu-system-x86_64 -enable-kvm -M microvm -cpu host -m 512m
> > -kernel /dev/shm/vmlinuz-5.10.0-7-amd64 -append "root=/dev/sda1
> > console=ttyS0,115200" -initrd /dev/shm/initrd.img-5.10.0-7-amd64
> > -nodefaults -no-user-config -nographic -serial stdio -hda
> > debian-sid-64.img -net nic -net user,hostfwd=tcp::22222-:22 -chardev
> > socket,id=char0,path=/run/vm001-vhost-fs.sock -device
> > vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs -object
> > memory-backend-file,id=mem,size=512M,mem-path=/dev/shm,share=on -numa
> > node,memdev=mem
> >
> >      qemu-system-x86_64: -device
> > vhost-user-fs-pci,queue-size=1024,chardev=char0,tag=myfs: No 'PCI' bus
> > found for device 'vhost-user-fs-pci'
> >
> > *microvm* is a minimalist machine type without PCI nor ACPI support, so
> > that seems to be a problem for `vhost-user-fs-pci`.
>
> Have you tried with the plain 'vhost-user-fs-device' model instead?

No, I did not, I didn’t know it existed. Using `vhost-user-fs-device` 
instead of `vhost-user-fs-pci` got it going. Thank you very much.


Kind regards,

Paul