Re: [Xen-devel] Xen 4.3 development update

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 13/05/2013 12:26, Ian Campbell ha scritto:
> On Fri, 2013-05-10 at 15:30 +0100, Fabio Fantoni wrote:
> > Il 10/05/2013 13:24, Anthony PERARD ha scritto:
> > > On 10/05/13 12:08, Anthony PERARD wrote:
> > > > On Fri, May 10, 2013 at 12:00 PM, George Dunlap
> > > > <George.Dunlap@xxxxxxxxxxxxx>  wrote:
> > > > > On Fri, May 10, 2013 at 11:26 AM, George Dunlap
> > > > > <George.Dunlap@xxxxxxxxxxxxx>  wrote:
> > > > > > * qxl not actually working
> > > > > >     > qxl apparently not enabled during compile by default
> > > > > >     > Appear to be some other bugs even when it is working:
> > > > > >     >http://lists.xen.org/archives/html/xen-devel/2012-11/msg00713.html
> > > > > >     owner: ? (Anthony was going to take a look)
> > > > > >     We need to either fix both of these problems or disable qxl for 4.3
> > > > > Anthony, you were going to take a look at this; did you make any progress?
> > > > Yes, I'm still trying to figure out how to enable qxl in the VM.
> > > And now, I can search why QEMU crash when starting Xorg with qxl.
> > Hi, thanks for your help.
> > I'm trying to have qxl full working on xen since end of 2011.
> > Since half of 2012 is at least working as standard vga.
> This means with:
>          vga = "qxl"
>
> in your configuration file?
Yes
> Are you saying that this configuration
> works?
For now it works only as standard vga
>   If not this then which configuration do you believe works?
With qxl driver enabled on domU's os, qemu crashes
> > The libxl patch should be correct, also with memory size setting.
> > I have tried same parameters of libxl qxl patch without xen and are working.
> > Also without kvm was working even if performance was really bad but at
> > least qemu did not crash on start with qxl driver.
> > Based on this test the problem seems to be xen related problem, probably
> > about hvmloader.
> What is the configuration which fails?
See on attachment
> Which libxl patch "should be correct"? libxl has lots of patches!
This patch that I refer:
http://xenbits.xen.org/gitweb/?p=xen.git;a=commit;h=aab4d1b266ce9891a684704f6abf6a5f6b3f7c24 

> So are you saying that although the libxl patch "should be correct" it
> is in fact not sufficient to make qxl work?
The qemu parameters used are correct, for now on xen works only as 
standard vga but on kvm and qemu-only tests works also with qxl driver.
The difference with xen appares to be only on hvmloader.
I tried to find the exactly problem without result, based on seabios 
debug I saw that when it detects xen hypervisor, seabios relies on 
tables passed by hvmloader instead generate them.
Is the only effective difference viewed with seabios debug with and 
without xen.
> > I have tried a lot of time to found exactly what the problem is without
> > success for now.
> > I have very little knowledge about these parts.
> Which possible causes have you investigated and ruled out? What possible
> causes have you been unable to check one way or the other?
>
> If you ask questions about specific things which you cannot follow then
> we may be able to point you in the right direction.
>
> Ian.
Hope that information above can help to clarify the whole problem.
If you need more details tell me and I'll post them.

Thanks for any reply.

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