Re: [Xen-devel] Unable to get QXL vga working

[ZhouPeng <zpengxen@xxxxxxxxx>]

On Wed, Jun 13, 2012 at 5:38 PM, Fabio Fantoni <fantonifabio@xxxxxxxxxx> wrote:
> Il 13/06/2012 11:02, ZhouPeng ha scritto:
>
>> On Mon, Jun 11, 2012 at 7:56 PM, Fabio Fantoni<fantonifabio@xxxxxxxxxx>
>>  wrote:
>>>
>>> Il 24/05/2012 13:28, ZhouPeng ha scritto:
>>>
>>>> On Thu, May 24, 2012 at 6:13 PM, Stefano Stabellini
>>>> <stefano.stabellini@xxxxxxxxxxxxx>    wrote:
>>>>>
>>>>> On Thu, 24 May 2012, ZhouPeng wrote:
>>>>>>
>>>>>> Sorry for late reply, I am not on this mail these days because of my
>>>>>> work.
>>>>>>
>>>>>> I further test qxl-vga and I think I figure out the problem in some
>>>>>> extend.
>>>>>>
>>>>>> If using qxl device, the default memory size of vga is 64M.
>>>>>> Which will cause xen_ram_alloc(qemu/xen-all.c) fails.
>>>>>>
>>>>>> The exact reason is xc_domain_populate_physmap_exact fails, because
>>>>>> xen-hypervisor
>>>>>> fail,
>>>>>> it's because of   alloc_domheap_pages(d, a->extent_order, a->memflags)
>>>>>> fails in hypervisor.
>>>>>>
>>>>>> I am not very familiar with xen's memory management, Does 64M exceed
>>>>>> xen's heap space in this context?
>>>>>
>>>>> XL sets an upper bound of memory that can be allocated to the VM in
>>>>> libxl__build_pre, calling xc_domain_setmaxmem.
>>>>> My guess is that a 64MB allocation would go over that limit.
>>>>> You could try increasing the limit manually changing the
>>>>> xc_domain_setmaxmem call in libxl__build_pre, or you could try setting
>>>>> videoram=64 in the VM config file.
>>>>
>>>> Your guess is absolutely right!
>>>>
>>>> But set videoram=128 or
>>>> xc_domain_setmaxmem(ctx->xch, domid, info->target_memkb +
>>>> LIBXL_MAXMEM_CONSTANT + 2 * 64 * 1024);
>>>>
>>>> Then I successfuly install qxl driver in win-hvm and QXL can work
>>>> properly.
>>>>
>>>> I will send some patch to add qxl support to libxl.
>>>
>>> I tried your 3 patches taken from the mailing list, it works but doesn't
>>> solve qxl problems for me, on linux domU (Precise and Wheezy) xorg
>>> doesn't
>>> start and on windows 7 I have heavy performance problem (unusable).
>>
>> Could you find qxl vga card  (named "Red Hat QXL GPU") in your
>> windows hvm's device manager to make sure your qxl is working?
>>
>> My testing hvm-guest is Win XP.
>>
>> I played "Harry Potter" in my LAN smoothly, qxl gives
>> great enhancement .
>>
>> Although I don't test win7 and linux, I think it should work for them.
>>>
>>> I tried also with qemu 1.1.0 but nothing change.
>>
>> I am not sure qemu 1.1.0 accept all the patches for xen.
>>
>> Could you have a try of git://xenbits.xen.org/qemu-upstream-unstable.git
>>
>> It is build and installed by default, you should enable spice support.
>> spice can be enabled like below:
>>
>> +++ b/tools/Makefile    Sat May 26 12:31:01 2012 +0800
>> @@ -157,6 +157,7 @@ subdir-all-qemu-xen-dir subdir-install-q
>>         --bindir=$(LIBEXEC) \
>>         --datadir=$(SHAREDIR)/qemu-xen \
>>         --disable-kvm \
>> +       --enable-spice \
>>
>>> Does it work correctly for you? If so can I have some detail of your
>>> configurations please?
>>
>> My vm.cfg:
>>
>> name = 'xpPro_spice'
>> firmware_override = '/usr/lib/xen/boot/hvmloader'
>> builder = 'hvm'
>> memory = '1024'
>> device_model_version = 'qemu-xen'
>> device_model_override = '/usr/lib/xen/bin/qemu-system-i386'
>> disk = [ 'file:/path-to-img/xpPro.img,ioemu:hda,w' ]
>> vif = ['ip=192.168.1.112, type=ioemu, bridge=eth0, mac=00:21:97:CB:0E:7D']
>> sdl=0
>> vnc=0
>> vncviewer=0
>> serial = 'pty'
>> vcpus=1
>> usbdevice='tablet'
>> #spice
>> spice=1
>> qxl=1
>> #qxlram=64
>> #qxlvram=64
>> spiceport=6000
>> spicehost='192.168.1.187'
>> spicedisable_ticketing = 1
>> spiceagent_mouse = 0 # (1|0)
>>
>>> For audio support this is needed too: (tested and working)
>>> -device intel-hda,id=sound0 -device hda-duplex,id=sound0-codec0 on qemu
>>> invocation and env QEMU_AUDIO_DRV=spice
>>> Can you add audio support on libxl please?
>>
>> I think audio support can be considered after qxl accpted.
>>>
>>>
>>
> Thanks for reply, qxl driver is installed, windows see qxl video card,
> already compiled qemu with spice with patch I send months ago, already tried
> git://xenbits.xen.org/qemu-upstream-unstable.git before 1.1.
> Unfortunately the results are always the same.
> Here a quick recording:
> Windows 7 test: http://fantu.it/vari/spiceqxldebug1.mkv

oh...  it shows spice+qxl running on Xen get
significant performance reduction compared with KVM ...

> Debian wheezy test: http://fantu.it/vari/spiceqxldebug2.mkv
> Are not new but the result of the last test is the same.
> I hope I can help you understand the problem.
> If you need more information ask.

-- 
Zhou Peng

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