[Qemu-devel] [Bug 1674925] Re: Qemu PPC64 kvm no display if --device virtio-gpu-pci is selected

[Thomas Huth]

Hi! I think unless you use "-vga none" or "-nodefaults", QEMU will always start 
your guest with a VGA card by default, so if you add an additional "--device 
virtio-gpu-pci", you'll end up with a guest that has two video cards, one VGA 
and one virtio-gpu.
Also there is a known bug in the SLOF version that has been shipped with QEMU 
2.8, which causes trouble with virtio-gpu:
http://git.qemu-project.org/?p=SLOF.git;a=commitdiff;h=38bf852e73ce6f0ac801dfe8ef1545c4cd0b5ddb
Please try again with the latest release candidate of QEMU 2.9, it should be 
fixed there.
(But please note that SLOF does not contain a driver for virtio-gpu, so you 
won't see any output from the firmware when starting your guest ... i.e. you'll 
just see some output once Linux has been started)

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https://bugs.launchpad.net/bugs/1674925

Title:
  Qemu PPC64 kvm no display if  --device virtio-gpu-pci is selected

Status in QEMU:
  New

Bug description:
  Hi,
  i did many tests on qemu 2.8 on my BE machines and i found an issue that i 
think was need to be reported

  Test Machines BE 970MP

  if i setup qemu with

  qemu-system-ppc64 -M 1024 --display sdl(or gtk),gl=on --device virtio-
  gpu-pci,virgl --enable-kvm and so and so

  result is doubled window one is vga other is virtio-gpu-pci without
  any start of the VM . pratically i dont have any output of openbios
  and on the virtual serial output

  the same issue i found is if i select:
  qemu-system-ppc64 -M 1024 --display gtk(or sdl) --device virtio-gpu-pci 
--enable-kvm and so and so

  
  i had been try to change all the -M types of all kind of pseries without any 
positive result.

  Ciao 
  Luigi

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