Re: Windows QXL Display Driver

[Gerd Hoffmann <kraxel@redhat.com>]

On Tue, May 24, 2022 at 12:35:49AM +1000, Geoffrey McRae wrote:
> Hi Gerd,
> 
> Over the past few weeks I have been adding spice display support to Looking
> Glass as a fallback mechanism for during system boot (or diags) before our
> application is loaded in the guest VM. The idea is to have the VFIO GPU
> duplicate it's output to the QXL device, which works fine until you load the
> QXL display driver.
> 
> The issue is that once the driver is loaded windows removes the option to
> duplicate the output.

Just don't load the driver then?  Or use stdvga instead?  Shouldn't make
a big difference performance-wise given that qxl supports 2d accel only
which is pretty much dead these days.

> Is this something that needs to be tweaked in the
> driver to allow this? or is there a technical reason why this can't be done?

I don't have much insight into the inner workings of the qxl windows
driver, sorry.

take care,
  Gerd