Re: Vdagent not working on xen linux hvm DomUs

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On Fri, Dec 06, 2013 at 01:49:51PM +0100, Fabio Fantoni wrote:
> Il 06/12/2013 12:57, Wei Liu ha scritto:
> >On Fri, Dec 06, 2013 at 12:51:34PM +0100, Fabio Fantoni wrote:
> >>Il 06/12/2013 12:31, Wei Liu ha scritto:
> >>>On Fri, Dec 06, 2013 at 12:28:00PM +0100, Fabio Fantoni wrote:
> >>>[...]
> >>>>Thanks for reply, where is the latest versions of your libxl patch
> >>>>for virtio-net / virtio-blk support?
> >>>>I found only the old version of 2011 on wiki.
> >>>>Is this the latest and I must updated it to be working on xen
> >>>>unstable before testing it?
> >>>>
> >>>That is not needed if you want to use virtio-net.
> >>>
> >>>Just specify 'model=virtio-net-pci' in you nic spec then you're fine.
> >>>
> >>>Wei.
> >>I did a fast test with virtio nic, xen platform disabled
> >>(xen_platform_pci=0 plus konrad patch) and qemu crashed on ubuntu
> >>Saucy hvm domU start with this error on qemu log:
> >>xen_ram_addr_from_mapcache, could not find 0x7f34c08afff8
> >>I tried both with/without pci=nomsi, same result.
> >>Then it seems that with virtio net there is a further problem.
> >>Tell me if you need other tests/details and I'll post them.
> >So the same config works with other emulated nic (say, the default
> >rtl8139 / e1000)?
> >
> >>Thanks for any reply.
> 
> Yes, I retried all cases removing only virtio net and no qemu crash.

And Konrad's patch did prevent kernel from unplugging the emulated
devices?

I used virtio-net-pci in EFI several days ago it worked fine, so it is
possible that there's a bug in kernel.

If there's really a regression I would not be too surprise because
nobody is actively using it so we're not actively testing this feature.

You can try xen_emul_unplug=never in *guest kernel command line* to see
if it changes anything.

Wei.
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