Re: [Xen-devel] [Spice-devel] Vdagent not working on xen linux hvm DomUs

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 05/12/2013 17:02, Wei Liu ha scritto:
> On Thu, Dec 05, 2013 at 04:50:03PM +0100, Fabio Fantoni wrote:
> > Il 05/12/2013 16:21, Wei Liu ha scritto:
> > > On Thu, Dec 05, 2013 at 04:11:52PM +0100, Fabio Fantoni wrote:
> > > [...]
> > > > I saw a draft of virtio disk/net implementation for xen here:
> > > > http://wiki.xen.org/wiki/Virtio_On_Xen
> > > >
> > > > There are 2 kernel patch to support virtio on pv domUs:
> > > > http://downloads.xen.org/Wiki/VirtioOnXen/linux-01-virtio-xenbus.patch
> > > > http://downloads.xen.org/Wiki/VirtioOnXen/linux-02-virtio-ring.patch
> > > Do not use these patches, they were experimental.
> > >
> > > > What about virtio on hvm linux? Maybe
> > > >  From wiki it seems virtio kernel patches only needed for pv domUs.
> > > > Could be these patches needed to have virtio fully working also for
> > > > hvm domUs?
> > > Virtio for HVM guests should work out of the box. You probably need to
> > > prevent kernel from unplugging emulated devices.
> > >
> > > Wei.
> > Thanks for reply.
> >
> > I not mean virtio disk/net but virtio-serial channels used for
> > example by spice vdagent.
> > The libxl implentation xen side is correct and on windows domUs
> > vdagent is working (I'm using it since 2 year).
> > On linux domUs I found that virtio ports under /dev are missed/not
> > created and I not understand why.
> That's probably unplugged by Xen platform PCI device.
>
> > Recently I tried also with xen_platform_pci=0 and the Konrad's patch
> > (xen/pvhvm: If xen_platform_pci=0 is set don't blow up) but to no
> > avail.
> I haven't followed up that patch so I am not sure what's happening.
>
> Wei.
>
> > Thanks for any reply.
I did another tests, adding pci=nomsi to kernel boot option creates 
virtio-serial ports correctly and vdagent works also on linux domUs, I 
also tried to enable the xen platform and also in that case vdagent works.
So the problem is only about msi.
Added xen-devel to cc.
Any ideas on how to fix permanently without adding pci=nomsi?

Thanks for any reply.

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