passing extra args to vga virtio

[KciNicK]

i have this vm:

# qm showcmd 104 --pretty
/usr/bin/kvm \
  -id 104 \
  -name 'BOOTTEST,debug-threads=on' \
  -no-shutdown \
  -chardev 'socket,id=qmp,path=/var/run/qemu-server/104.qmp,server=on,wait=off' \
  -mon 'chardev=qmp,mode=control' \
  -chardev 'socket,id=qmp-event,path=/var/run/qmeventd.sock,reconnect=5' \
  -mon 'chardev=qmp-event,mode=control' \
  -pidfile /var/run/qemu-server/104.pid \
  -daemonize \
  -smbios 'type=1,uuid=23c220b9-198d-4c0b-bb0f-eb26e70eb3c8' \
  -smp '1,sockets=1,cores=1,maxcpus=1' \
  -nodefaults \
  -boot 'menu=on,strict=on,reboot-timeout=1000,splash=/usr/share/qemu-server/bootsplash.jpg' \
  -vnc 'unix:/var/run/qemu-server/104.vnc,password=on' \
  -cpu host,+kvm_pv_eoi,+kvm_pv_unhalt \
  -m 8192 \
  -device 'pci-bridge,id=pci.1,chassis_nr=1,bus=pci.0,addr=0x1e' \
  -device 'pci-bridge,id=pci.2,chassis_nr=2,bus=pci.0,addr=0x1f' \
  -device 'vmgenid,guid=e406ca29-82b9-4a17-9bda-36127fd00c56' \
  -device 'piix3-usb-uhci,id=uhci,bus=pci.0,addr=0x1.0x2' \
  -device 'usb-tablet,id=tablet,bus=uhci.0,port=1' \
  -device 'virtio-vga,id=vga,bus=pci.0,addr=0x2' \
  -device 'virtio-serial,id=spice,bus=pci.0,addr=0x9' \
  -chardev 'spicevmc,id=vdagent,name=vdagent' \
  -device 'virtserialport,chardev=vdagent,name=com.redhat.spice.0' \
  -spice 'tls-port=61001,addr=127.0.0.1,tls-ciphers=HIGH,seamless-migration=on' \
  -device 'virtio-balloon-pci,id=balloon0,bus=pci.0,addr=0x3,free-page-reporting=on' \
  -iscsi 'initiator-name=iqn.1993-08.org.debian:01:d8d92655119f' \
  -drive 'if=none,id=drive-ide2,media=cdrom,aio=io_uring' \
  -device 'ide-cd,bus=ide.1,unit=0,drive=drive-ide2,id=ide2,bootindex=101' \
  -netdev 'type=tap,id=net0,ifname=tap104i0,script=/var/lib/qemu-server/pve-bridge,downscript=/var/lib/qemu-server/pve-bridgedown,vhost=on' \
  -device 'virtio-net-pci,mac=BC:24:11:77:9F:CC,netdev=net0,bus=pci.0,addr=0x12,id=net0,rx_queue_size=1024,tx_queue_size=256,bootindex=100' \
  -machine 'type=pc+pve0'

i need to add an extra parameter to:

-device 'virtio-vga,id=vga,bus=pci.0,addr=0x2'

to look like this:

-device 'virtio-vga,id=vga,bus=pci.0,addr=0x2,xres=1920,yres=1080'

why it is so difficult to do something like this?

 

[LnxBil]

why it is so difficult to do something like this?

Not the answer you're looking for, yet you can also set the resolution interactively in the BIOS (even in UEFI mode). Just press F2 and move to the OVMF settings:



Maybe that is what you're looking for?

 

[KciNicK]

thanks for your reply, i don't have the option of F2 on legacy bios, i'm not using uefi, those seem to be vesa resolutions. If i start the vm from the command line, i get it working, but i would like to use the GUI, i tried multiple things as args: on the conf file, but none seems to work, adding the device and -vga none work, but then the remote console is not working

 

[LnxBil]

don't have the option of F2 on legacy bios, i'm not using uefi, those seem to be vesa resolutions.

Ah, okay.

BTW: Why don't you just set the resolution in your guest operating system? This should work out-of-the-box, at least it does for me. I'm trying to understand why it is so important to set the resolution beforehand and via QEMU/kvm.

 

[gfngfn256]

Show output for qm config 104

 

[KciNicK]

Ah, okay.

BTW: Why don't you just set the resolution in your guest operating system? This should work out-of-the-box, at least it does for me. I'm trying to understand why it is so important to set the resolution beforehand and via QEMU/kvm.

that would be ideal, but cannot do, i'm trying to set the resolution of the framebuffer console:

# fbset

mode "1280x800"
    geometry 1280 800 1280 800 32
    timings 0 0 0 0 0 0 0
    rgba 8/16,8/8,8/0,0/0
endmode

the only available mode is the one passed in the config, i can set the default resolution at anything, but as soon as the virtio modules is loaded, the resolution set itself at 1280x800, i can avoid loading the driver, but the speed of the default vga console is horrible

 

[KciNicK]

Show output for qm config 104

agent: 1
bios: ovmf
boot: order=net0;ide2
cores: 1
cpu: host
description: args%3A -device virtio-vga,id=vga,bus=pci.0,addr=0x2,xres=1920,yres=1080
ide2: none,media=cdrom
memory: 8192
meta: creation-qemu=8.1.5,ctime=1718145649
name: BOOTTEST
net0: virtio=BC:24:11:77:9F:CC,bridge=vmbr0,tag=5
numa: 0
ostype: l26
scsihw: virtio-scsi-pci
smbios1: uuid=23c220b9-198d-4c0b-bb0f-eb26e70eb3c8
sockets: 1
vga: virtio
vmgenid: e406ca29-82b9-4a17-9bda-36127fd00c56

 

[gfngfn256]

description: args%3A -device virtio-vga,id=vga,bus=pci.0,addr=0x2,xres=1920,yres=1080

What is this?
To add args add a NEW line in to the 104.conf file. So

nano /etc/pve/qemu-server/104.conf

# Then add the following line (alphabetically ordered)

args:  -device 'virtio-vga,id=vga,bus=pci.0,addr=0x2,xres=1920,yres=1080'

Give it a try.

 

[KciNicK]

What is this?
To add args add a NEW line in to the 104.conf file. So

nano /etc/pve/qemu-server/104.conf

# Then add the following line (alphabetically ordered)

args:  -device 'virtio-vga,id=vga,bus=pci.0,addr=0x2,xres=1920,yres=1080'

Give it a try.

Already try that, it didn't work, i commented the line with a #, the parser converted the comment as a "description" that can be see on the webgui on the summary tab, adding the device with addr=0x2 says 0x2 is already on the -vga virtio, failed to start, if i remove the -vga virtio or use -vga none, it works, but no console on the webgui, as it thinks the vm has no vga. I know it works coz ssh to the vm, running fbset says the console is running at 1920x1080.

 

[gfngfn256]

the parser converted the comment as a "description"

I suspected as much.

Lets try & be innovative & try something else:

nano /etc/pve/qemu-server/104.conf

# Edit the VGA line as follows:

vga: virtio,xres=1920,yres=1080

I don't believe you need the bus or the address here as they are default.

 

[KciNicK]

already try that to, error with "vga don't support any parameters on the schema" or something like that, failed to start vm

 

[gfngfn256]

Assuming you entered that line exactly as I did ("no inverted commas") I am out of ideas presently.

Edit: One further try, how about you add your args device line & choose Spice (qxl) instead for the vga?

 

[KciNicK]

Assuming you entered that line exactly as I did ("no inverted commas") I am out of ideas presently.

Edit: One further try, how about you add your args device line & choose Spice (qxl) instead for the vga?

sorry, before coming here, i try every possible combination, including qxl, also try many things on the vm side, module options, etc...
the only thing that works, is starting the vm from command line, removing the -vga and adding my own

 

[KciNicK]

for anyone interested, i ended up passing the param video=1920x1080 to the kernel module inside the vm at boot time as a workaround to not be able to properly edit the vm configuration on proxmox

 

[LnxBil]

for anyone interested, i ended up passing the param video=1920x1080 to the kernel module inside the vm at boot time as a workaround to not be able to properly edit the vm configuration on proxmox

Yes that would also be my next guess. Depending on the linux version, you may also add vga=0x392. This works for me in the early boot and in the end with the video setting (setting both).

 

[KciNicK]

vga=0x392 is for the default vga framebuffer, once the qxl or virtio module is loaded the vga is removed, that setting is only good for a few seconds, but yes, the combination of both get the console at that resolution all the time.