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Re: [Xen-devel] Spice as alternative to vnc also on pv domU

Il 29/04/2013 14:45, Stefano Stabellini ha scritto:
On Mon, 29 Apr 2013, Pasi KÃrkkÃinen 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@xxxxxxxxxx> 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

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 at http://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.

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