Re: Spice as alternative to vnc also on pv domU

[George Dunlap <george.dunlap@eu.citrix.com>]

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On 29/04/13 14:00, Fabio Fantoni wrote:
> Il 29/04/2013 14:45, Stefano Stabellini ha scritto:
>> On Mon, 29 Apr 2013, Pasi Kärkkäinen wrote:
>>> On Mon, Apr 29, 2013 at 11:13:58AM +0100, Stefano Stabellini wrote:
>>>> On Mon, 29 Apr 2013, George Dunlap wrote:
>>>>> On Fri, Apr 26, 2013 at 3:04 PM, Fabio Fantoni<fantonifabio@tiscali.it>  wrote:
>>>>>> I'm using Spice on my xen test system since end of 2011.
>>>>>> Spice is better than vnc for use on maintenance tasks and better than
>>>>>> nx/x2go/rdp installed on domU (even better when used with vdagent and usb
>>>>>> redirection).
>>>>>>
>>>>>> That should be possibile because also pv use qemu for vnc but I don't
>>>>>> unsterstand exactly how to implement it.
>>>>>> Is anybody out there interested in this task or already done it?
>>>>> Upon further reflection though -- it seems like the best thing to do
>>>>> would be just to install spice servers in your PV guest.
>>>> And apparently it even exists!
>>>> The spice server used to be part of QEMU/KVM and not available
>>>> separately, but looking athttp://spice-space.org/download.html, now
>>>> they have an "Xspice" server that probably does exactly what you need.
>>>>
>>>> Otherwise implementing spice for PV guests could be non-trivial: spice
>>>> relies on a virtual graphic card called QXL, similar to a virtio device.
>>>> Typically Virtio devices work over PCI (even though other transport
>>>> mechanisms exist), and PV guests don't even have a PCI bus.
>>>>
>>> Hmm I thought spice works also *without* QXL ?
>>> So PV domUs could have spice without QXL ?
>> I thought that the QXL is a requirement but I might be wrong.
>>
>>
> It works also without qxl. xl implementation of qxl is complete but 
> for now qxl on xen doesn't work correctly. It seems that some 
> changes/fixes are needed on hvmloader according to my tests.
> Now I'm using spice with stdvga and it is better than vnc.

Ah -- right, well if that's the case we'd better not advertise it as a 
4.3 feature.

  -George


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