add QEMU Guest Agent

[hgy59]

Description

• initial version of qemu-ga, builds for arch-x64-7.1 only

Fixes #6019

Checklist

• Build rule all-supported completed successfully
• New installation of package completed successfully
• Package upgrade completed successfully (Manually install the package again)
• Package functionality was tested
• Any needed documentation is updated/created

Type of change

• New Package

[hgy59]

@sgelineau17 can you please try, whether this works with proxmox?

[tofuHero]

this qemu-ga build is not work on my DSM vm.

this is DSM vm setting:

and this vm status:

qemu-ga is installed on this vm:

qemu-ga command output:

root@a300-DS920plus:~# qemu-ga 
1720684752.201439: critical: failed to write persistent state to /var/packages/qemu-ga/var/run/qga.state: Failed to create file “/var/packages/qemu-ga/var/run/qga.state.TI8LQ2”: No such file or directory
1720684752.201478: critical: unable to create state file at path /var/packages/qemu-ga/var/run/qga.state
1720684752.201488: critical: failed to load persistent state
1720684752.201495: critical: error initializing guest agent

[hgy59]

@tofuHero did you try to add the missing folder /var/packages/qemu/var/run ?

after creating the run folder, I get a different error (not running under qemu/proxmox):

$ sudo qemu-ga
1720716108.104297: critical: error opening channel '/dev/virtio-ports/org.qemu.guest_agent.0': No such file or directory
1720716108.104594: critical: failed to create guest agent channel
1720716108.104675: critical: failed to initialize guest agent channel

[r0bb10]

@tofuHero did you try to add the missing folder /var/packages/qemu/var/run ?

after creating the run folder, I get a different error (not running under qemu/proxmox):

$ sudo qemu-ga
1720716108.104297: critical: error opening channel '/dev/virtio-ports/org.qemu.guest_agent.0': No such file or directory
1720716108.104594: critical: failed to create guest agent channel
1720716108.104675: critical: failed to initialize guest agent channel

i've done that and also got this error.

[hgy59]

@r0bb10 I did some analysis on the qemu-ga package of https://spk7.imnks.com/

1. qemu-ga runs as a service
2. the service must run as root, so you have to patch the privilege file after installation and each update (to replace package by root) and then restart the package
3. the package installs the var/run folder
4. the package includes two kernel modules for console (hvc_console.ko and virtio_console.ko)
5. before service start:
   • the package loads the console modules on demand with insmod
   • the package creates the virtio-ports device on demand (and binds /dev/vport1p1 to /dev/virtio-ports/org.qemu.guest_agent.0)
   • the package creates the folder /var/local/run on demand

We could clone the functions of the implementation by imnks.com/jim.plus, but I doubt that it will be more stable.

[hgy59]

@tofuHero, @r0bb10 I did some progress.
On my virtual DSM qemu-ga is running now as service (with manual patch of privilege file and manual service start).

I guess when not running virtual dsm, the kernel module virtio_console.ko is not running and we must include it in the package.

Can you please check with:
lsmod | grep -i virtio_console

on my virtual dsm it shows:

# lsmod | grep -i virtio_console
virtio_console         19522  1
virtio_ring             5789  6 virtio_blk,virtio_net,virtio_pci,virtio_rng,virtio_console,virtio_scsi
virtio                  5698  6 virtio_blk,virtio_net,virtio_pci,virtio_rng,virtio_console,virtio_scsi

[r0bb10]

@tofuHero, @r0bb10 I did some progress. On my virtual DSM qemu-ga is running now as service (with manual patch of privilege file and manual service start).

I guess when not running virtual dsm, the kernel module virtio_console.ko is not running and we must include it in the package.

Can you please check with: lsmod | grep -i virtio_console

on my virtual dsm it shows:

# lsmod | grep -i virtio_console
virtio_console         19522  1
virtio_ring             5789  6 virtio_blk,virtio_net,virtio_pci,virtio_rng,virtio_console,virtio_scsi
virtio                  5698  6 virtio_blk,virtio_net,virtio_pci,virtio_rng,virtio_console,virtio_scsi

mm installed the latest version Build #6811, done the run-as root, package starts and no error seem obvious

root@vdsm:/volume1/@appstore/qemu-ga/bin# /volume1/@appstore/qemu-ga/bin/qemu-ga -v
1720894497.519524: debug: Guest agent version 9.0.1 started
1720894497.519566: debug: disabling command: guest-get-devices
1720894497.519635: debug: received EOF
1720894497.620480: debug: received EOF
1720894497.721515: debug: received EOF
1720894497.822490: debug: received EOF
1720894497.923571: debug: received EOF
1720894498.024563: debug: received EOF
1720894498.125515: debug: received EOF
1720894498.226596: debug: received EOF
1720894498.327556: debug: received EOF
1720894498.428602: debug: received EOF
1720894498.529475: debug: received EOF
1720894498.630571: debug: received EOF
1720894498.731513: debug: received EOF
1720894498.832537: debug: received EOF
1720894498.933481: debug: received EOF
1720894499.034596: debug: received EOF

and

root@vdsm:/volume1/@appstore/qemu-ga/bin# lsmod | grep -i virtio_console
virtio_console         19522  1
virtio_ring             5789  6 virtio_blk,virtio_net,virtio_pci,virtio_rng,virtio_console,virtio_scsi
virtio                  5698  6 virtio_blk,virtio_net,virtio_pci,virtio_rng,virtio_console,virtio_scsi

log file

root@vdsm:/volume1/@appdata/qemu-ga# tail -f qemu-ga.log
Sat Jul 13 20:19:30 CEST 2024
Begin service_prestart
End service_prestart
Starting qemu-ga command /volume1/@appstore/qemu-ga/bin/qemu-ga --daemonize --logfile /volume1/@appdata/qemu-ga/qemu-ga.log --pidfile /volume1/@appdata/qemu-ga/qemu-ga.pid