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

[Fabio Fantoni]

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.