[Qemu-discuss] Using egl-headless with virtio-vga video device crashes the guest

[Erik Skultety]

Hi,
I tried to test egl-headless (combined with either SPICE or VNC) with virtio
graphics (doesn't really matter whether I enable virgl or not, the result is
the same) which results in a guest crash. If I try a similar setup with SPICE
(using gl=on) it works as expected. Looking at the machine log libvirt produced
doesn't show anything useful apart from:

2018-11-28 12:51:26.032+0000: shutting down, reason=crashed

Now, it very well might be something wrong with my setup so I'd appreciate any
advice here, btw you can find the libvirt XML in the attachment.

Thanks,
Erik

[Frederik Carlier]

Hi Erik,

From: Qemu-discuss <qemu-discuss-
Skultety
Sent: Wednesday, November 28, 2018 2:20 PM
I tried to test egl-headless (combined with either SPICE or VNC) with virtio
graphics (doesn't really matter whether I enable virgl or not, the result is the
same) which results in a guest crash. If I try a similar setup with SPICE (using
gl=on) it works as expected. Looking at the machine log libvirt produced doesn't

For what it's worth, I've been doing some experiments with egl-headless recently and here's what I've observed:
- On a headless server (i.e. without X11), qemu would crash (SIGSEV) when the VM entered graphics mode. I got a bit futher by applying a patch [1]
- The display is messed up after I soft reboot the machine. This happens on the RC versions of 3.1, as well
- I've observed a couple of scenarios in which the VM would crash and reboot, but I'm not sure how to debug these scenarios.

Frederik.

[1] https://groups.g