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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Fri, Dec 06, 2013 at 11:15:17AM +0100, Fabio Fantoni wrote:
[...]
> >>
> >>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?
> 

As I remember it I wrote a patch for QEMU to make it capable of
injecting MSI interrupt in Xen long time ago so it should work fine.

Wei.

> Thanks for any reply.

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