Tried:
sudo mkdir -p /var/lib/libvirt/virtiofsd/test1
Get a guest and add
<filesystem type='mount' accessmode='passthrough'>
<driver type='virtiofs'/>
<binary xattr='on'>
<lock posix='on' flock='on'/>
</binary>
<source dir='/var/lib/libvirt/virtiofsd/test1'/>
<target dir='test1'/>
</filesystem>
due to:
"error: unsupported configuration: virtiofs requires one or more NUMA nodes"
This is explained in https://libvirt.org/kbase/virtiofs.html as a pre-req for
shared memory
Due to that also add something like:
<numa>
<cell id='0' cpus='0-7' memory='2' unit='GiB' memAccess='shared'/>
</numa>
There are more details for memory backing in the link above, but this
gets you working.
In the guest one can then mount that via:
$ sudo mount -t virtiofs test1 /mnt
Runs fine on the host and provides transparent host FS access
in a more modern fashion than 9p.
ubuntu@node-horsea:~$ systemctl status libvirtd
● libvirtd.service - Virtualization daemon
Loaded: loaded (/lib/systemd/system/libvirtd.service; enabled; vendor
preset: enabled)
Active: active (running) since Wed 2020-08-26 06:11:11 UTC; 24min ago
TriggeredBy: ● libvirtd-admin.socket
● libvirtd.socket
● libvirtd-ro.socket
Docs: man:libvirtd(8)
https://libvirt.org
Main PID: 1499817 (libvirtd)
Tasks: 159 (limit: 32768)
Memory: 63.1M
CGroup: /system.slice/libvirtd.service
├─ 1355 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
--dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
├─ 1356 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/default.conf --leasefile-ro
--dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
├─ 41956 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/net-host-only-bridge-for-dpdk-1.conf
--leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
├─ 41957 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/net-host-only-bridge-for-dpdk-1.conf
--leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
├─ 41984 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/net-host-only-bridge-for-dpdk-2.conf
--leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
├─ 41985 /usr/sbin/dnsmasq
--conf-file=/var/lib/libvirt/dnsmasq/net-host-only-bridge-for-dpdk-2.conf
--leasefile-ro --dhcp-script=/usr/lib/libvirt/libvirt_leaseshelper
├─1499817 /usr/sbin/libvirtd
├─1518124 /usr/lib/qemu/virtiofsd --fd=28 -o
source=/var/lib/libvirt/virtiofsd/test1,xattr,flock,posix_lock
└─1518142 /usr/lib/qemu/virtiofsd --fd=28 -o
source=/var/lib/libvirt/virtiofsd/test1,xattr,flock,posix_lock
Works fine with the apparmor rule applied.
I also tried to remove the rule and can confirm the former error.
$ virsh start virtiofsd-guest
error: Failed to start domain virtiofsd-guest
error: internal error: virtiofsd died unexpectedly
[173492.773174] audit: type=1400 audit(1598423932.651:6460):
apparmor="DENIED" operation="exec" profile="libvirtd"
name="/usr/lib/qemu/virtiofsd" pid=1518858 comm="rpc-worker"
requested_mask="x" denied_mask="x" fsuid=0 ouid=0
We should probably create a apparmor subprofile for
/usr/lib/qemu/virtiofsd before we start to fade out 9p support.
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https://bugs.launchpad.net/bugs/1892736
Title:
virtiofsd enablement
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