Re: Xen 4.3 development update

[Fabio Fantoni <fabio.fantoni@m2r.biz>]

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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@eu.citrix.com>  wrote:
>>>>> On Fri, May 10, 2013 at 11:26 AM, George Dunlap
>>>>> <George.Dunlap@eu.citrix.com>  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.

[-- Attachment #2: W7.cfg --]
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name='W7'
builder="hvm"
#device_model_override="/usr/bin/qemu-system-x86_64"
memory=2048
vcpus=2
#nestedhvm=1
vif=['bridge=xenbr0,mac=00:16:3e:42:ae:8f']
disk=['/mnt/vm/disks/W7.disk1.xm,raw,hda,rw',',raw,hdb,ro,cdrom']
#disk=['/mnt/vm/disks/W7.disk1.xm,raw,hda,rw']
boot='dc'
device_model_version="qemu-xen"
xen_platform_pci=1
#viridian=1
vnc=0
#vncunused=1
#vnclisten="0.0.0.0"
#keymap="it"
#on_poweroff="destroy"
#on_reboot="restart"
on_crash="destroy"
vga="qxl"
spice=1
spicehost='0.0.0.0'
spiceport=6002
spicedisable_ticketing=1
spicevdagent=1
soundhw="hda"
localtime=1

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