I have a libvirt/KVM with QEMU running a Windows 7 guest using the Spice/QXL video emulator.
How do I set a graphics mode not listed by default in the Windows screen resolution settings? For example, a mode like 2048x900 would be nice. The guest has a 21:9 screen and its very low height limits the use of hi-res 4:3 modes available in Windows.
I tried installing the Windows guest tools "guest agent" by Red Hat but they won't install. Therefore I am hoping for a solution that works by instructing spice what to emulate.
I read that using a Linux guest one can do these things directly from the guest by adding a new mode line with
xrandr but I do not know how to do these things with the confusing graphical settings interface in Windows.
Ideally, of course, the screen resolution of the guest would change with the guest window size but I know that this would require some sort of guest tools that I do not have - or just won't install.