Dual head across two systems using SPICE

[James Le Cuirot]

Hello,

My new work situation has meant that I'm using QEMU, cross-compiled
from Gentoo, on a Windows 10 host laptop but connecting via SPICE from
another Linux desktop. I also use Barrier to share input between the two
machines and ideally I'd like to have the laptop showing a second QEMU
display.

I've tried allowing multiple SPICE clients but this is experimental and
it freezes up too much to be usable. It's nice when it works though.
I've also tried using SDL for one display and SPICE for the other. With
a single multi-output QXL device, SDL fullscreen zooms out both displays
to show them at once so that's no good. With two QXL devices, it
actually looks correct but input is very confused and QEMU quickly
crashes.

Even with a single display, the SPICE client occasionally freezes up
but not as much so it is usable. Perhaps if I can figure this out, two
displays will also work. It's actually just the video that freezes
while input continues to work. Debug output from remote-viewer doesn't
log anything interesting. I can immediately reconnect the SPICE client
and it's fine again until the next time.

I'm using recent releases of all dependencies but the latest git master
of QEMU and SPICE. I tried to build QEMU with GTK support to see if
that was any better but cross-compiling GTK for Windows is hard work.

Any ideas?

-- 
James Le Cuirot (chewi)
Gentoo Linux Developer

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