Re: [Xen-devel] [Qemu-devel] Qxl problem with xen domU, is xen spice and/or qemu bugs?

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 26/09/2013 12:28, Fabio Fantoni ha scritto:
> Il 24/09/2013 13:50, Gerd Hoffmann ha scritto:
> >    Hi,
> >
> > > Someone can help me to find the problem that makes qxl unusable please?
> > #1 git cherry-pick c58c7b959b93b864a27fd6b3646ee1465ab8832b
> Thanks for reply, did this on my new test build.
>
> > #2 When using f19 try without X11 first.  You should have a working
> >     framebuffer console on qxldrmfb before trying to get X11 going.
> I tried on Fedora19 minimal installation and with qxl the text console 
> is working and lsmod show also qxl.
> Is this your intended or is there something else I must test before X11?
>
> > #3 qxl has a bunch of tracepoints.  Enable them, then compare xen
> >     results with kvm/tcg results to see where things start going wrong.
> I enabled qxl debug with these qemu paramters:
> -global qxl-vga.debug=1 -global qxl-vga.guestdebug=20
>
> With Fedora19 I have some difficult to found exact problem and compare 
> with kvm.
> I tried to test Fedora19 on debian sid kvm host same qemu version 
> (1.6) on both sides but with qxl fails to start the DE, also in 
> fallback mode. Probably there are also regression on qemu and/or spice 
> about qxl.
> The qemu log returns nothing relevant with only few lines on xen test 
> with also qxl debug enabled.
> I tried also W7 domU on xen with spice-guest-tools-0.65.exe and qxl: 
> domU starts, loads correctly the DE, vdagent and mouse are both 
> working, but screen refreshing is very lagging (also only open of 
> start menu).
> The qemu log become of 22 mb in only few minutes, mainly qxl debug.
> Can you check the W7 qemu log on attachment to see if there are 
> strange things to solve also on spice and/or qemu?
Previous mail was reject by mailing lists because attachment was too 
big, I upload it here:
http://www.filedropper.com/qemu-dm-w7
> Thanks for any reply.
>
> > #4 qxl needs a permanent mapping of the two pci memory bars as the
> >     (host virtual) memory location of these bars is passed to the
> >     spice-server library.  That might need some special care on xen
> >     due to the mapcache.  Disclamer: It's been a few years I looked
> >     closer at this, so things in the xen world might have changed
> >     meanwhile ...
> >
> > HTH,
> >    Gerd

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