On a Monday in 2020, Vivek Goyal wrote:
On Fri, Jun 05, 2020 at 11:50:06AM +0100, Boris Ebwanga wrote:Hello everyone.It's been a while now, I am trying to use virtio-fs. Everything I do end up with an error. First I was on fedora 31 and I tried to run manually qemu with virtio-fs https://virtio-fs.gitlab.io/howto-qemu.html. But I was not able to "make virtiofsd". Then, I upgraded to fedora 32 which has virtiofsd at /usr/libexec. I followed the steps describe at https://libvirt.org/kbase/virtiofs.html I could not modify the XML domain of my VM. The error message is "*unsupported configuration: unknown fs virtiofs » driver type".*
That is correct. libvirt learned about the 'virtiofs' driver type in v6.2.0, Fedora 32 has 6.1.0: https://apps.fedoraproject.org/packages/libvirt/ You can try enabling the experimental virt-preview repo to get more recent builds of libvirt, QEMU and other virt packages: https://fedoraproject.org/wiki/Virtualization_Preview_Repository
Hi Boris, Ccing Jan Tomko. He might have toughts on this.I wrote to Stefan Hajnoczi <[email protected]> describing this problem. He answers with the following: Hi Boris, > You can pass command-line options to the guest like this: > > <domain type='kvm' xmlns:qemu=' > http://libvirt.org/schemas/domain/qemu/1.0'> > ... > <qemu:commandline> > <qemu:arg value='-chardev'/> > <qemu:arg value='socket,id=char0,path=/tmp/vhost-fs.sock'/> > <qemu:arg value='-device'/> > <qemu:arg > value='vhost-user-fs-pci,chardev=virtio-fs-chardev,tag=myfs'/> > </qemu:commandline> > </domain> > > Note that the xmlns in the <domain> tag is required. > > If you pass these options manually then you need to launch virtiofsd > yourself before launching the guest: > > # /usr/libexec/virtiofsd --socket-path=/tmp/vhost-fs.sock -o > source=/path/to/share/dir -o no_posix_lock -o xattr > > Hope this helps! Please email [email protected] if you have any more > questions, it's the virtio-fs mailing list and others will be able to > participate in the discussion. > I am still getting the same error after applying the change above. Can anyone help me with this ? Thank you in advance for your help.Can you attach your domain xml file here. I think you also will need to add following in <qemu:commandline> section. <qemu:arg value='-object'/> <qemu:arg value='memory-backend-file,id=mem,size=8G,mem-path=/dev/shm,share=on'/> <qemu:arg value='-numa'/> <qemu:arg value='node,memdev=mem'/>
Even with libvirt 6.1.0 that does not know virtiofs yet, the shared memory can be specified as described on https://libvirt.org/kbase/virtiofs.html Jano
Thanks Vivek
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