Win10 DomU with QXL graphics unusable

[Stefan Kadow <xen@xxxxxxxx>]

Hello,

when using QXL graphics in win10 domU, the system runs as long as I use 
the
Windows Basic Display Adapter. When I install the latest qxldod driver 
from
Fedora/RedHat, the system becomes unusable. Delayed response times of 
30s and
more. I have tried ovmf and seabios, but with the same result.

When I copy the Qemu commandline from verbose xl output, I get a 
software
emulated slow but usable/responsive System. The only thing I had to 
change is
the machine type from xenfv to pc.

Is this a Xen or a Qemu related problem?

I tried unsuccessfully to patch the source code of the xl toolkit, 
because I
think it is a problem with the machine type "pc,accel=xen", which is set 
by xl
when calling qemu.

--
THX for any help!