Re: virtio-9p filesharing issue

[Aryabhata <bsdhexa%gmail.com@localhost>]

In your libvirt configuration, ensure that the filesystem type is set to virtio, which should match the virtio driver used for the 9P transport device. Here's an example snippet:<filesystem type='mount' accessmode='mapped'>

  <source dir='/home/tar/Public/share'/>

  <target dir='/mnt'/>

  <driver type='virtio'/>

</filesystem>

Also Monitor the guest's system logs (/var/log/messages) for any errors related to virtio or the vio9p driver during boot or when attempting to access the shared directory.

On Sun, 5 May, 2024, 4:39 pm Taryel Hlontsi, <xhaaix%gmail.com@localhost> wrote:

Hi all,

Recently I was trying NetBSD10 amd64 as a KVM/QEMU guest on Linux host
and wanted to configure a shared directory with the new vio9p driver.
However I did not succeed. It looks like something was detected as a 9P
transport device but that's about it.

Maybe someone has some clues on how to configure it properly?

HOSTS (if it matters):
Debian 12 on Ext4
Ubuntu 24.04 on XFS

GUEST:
uname -a
NetBSD zed.home 10.0 NetBSD 10.0 (GENERIC) #0: Thu Mar 28 08:33:33 UTC
2024 mkrepro%mkrepro.NetBSD.org@localhost:/usr/src/sys/arch/amd64/compile/GENERIC
amd64
The NetBSD current produces the same result

My libvirt filesystem config:
     <filesystem type="mount" accessmode="mapped">
       <source dir="/home/tar/Public/share"/>
       <target dir="/mnt"/>
       <address type="pci" domain="0x0000" bus="0x00" slot="0x08"
function="0x0"/>
     </filesystem>

dmesg | grep -E 'vio|virtio'
[     1.016364] virtio0 at pci0 dev 6 function 0
[     1.016364] virtio0: console device (id 3, rev. 0x00)
[     1.016364] virtio0: autoconfiguration error: no matching child
driver; not configured
[     1.016364] virtio1 at pci0 dev 7 function 0
[     1.016364] virtio1: memory balloon device (id 5, rev. 0x00)
[     1.016364] viomb0 at virtio1: features: 0x10000000<INDIRECT_DESC>
[     1.016364] virtio1: allocated 8192 byte for virtqueue 0 for
inflate, size 128
[     1.016364] virtio1: allocated 8192 byte for virtqueue 1 for
deflate, size 128
[     1.016364] virtio1: interrupting at ioapic0 pin 11
[     1.016364] virtio2 at pci0 dev 8 function 0
[     1.016364] virtio2: 9P transport device (id 9, rev. 0x00)
[     1.016364] virtio2: autoconfiguration error: no matching child
driver; not configured

modstat | grep -E 'vio|virtio'
if_vioif                   driver   builtin  -        0       - virtio
ld_virtio                  driver   builtin  -        0       - ld,virtio
viomb                      driver   builtin  -        0       - virtio
vioscsi                    driver   builtin  -        0       - virtio
virtio                     driver   builtin  -        5       - -
virtio_pci                 driver   builtin  -        0       - pci,virtio

Thank you