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

[Fabio Fantoni]

Il 13/12/2013 17:22, Wei Liu ha scritto:
> On Fri, Dec 13, 2013 at 10:51:01AM +0100, Fabio Fantoni wrote:
> > Il 12/12/2013 17:05, Fabio Fantoni ha scritto:
> > > Il 12/12/2013 16:23, Wei Liu ha scritto:
> > > > On Thu, Dec 12, 2013 at 02:10:23PM +0100, Fabio Fantoni wrote:
> > > > [...]
> > > > > I did some other tests, I narrowed down the commit range to
> > > > > the one between:
> > > > >
> > > > > commit c9fea5d701f8fd33f0843728ec264d95cee3ed37 Mon, 22 Jul 2013
> > > > > 15:14:18 (Merge remote-tracking branch 'bonzini/iommu-for-anthony')
> > > > > where there is virtio net regression with xen
> > > > >
> > > > > and
> > > > >
> > > > > commit    962b03fcf509db25c847aa67c4eff574c240dcfe Thu, 4 Jul 2013
> > > > > 15:42:43 +0000 (xen: Mark fixed platform I/O as unaligned)
> > > > > where virtio net is working
> > > > >
> > > > > I also tested:
> > > > > commit 2562becfc126ed7678c662ee23b7c1fe135d8966 Mon, 15 Jul 2013
> > > > > 19:02:41 +0000
> > > > > and
> > > > > commit dcb117bfda5af6f6ceb7231778d36d8bce4aee93 Thu, 4 Jul 2013
> > > > > 15:42:46 +0000
> > > > > but qemu crashes on xl create for another error and I haven't found
> > > > > which is the commit to apply with git cherry-pick so that I can
> > > > > check if the virtio net regression is present.
> > > > >
> > > > > Can someone help me please?
> > > > >
> > > > > I added also qemu-devel to cc.
> > > > I did a quick test with Xen's QEMU, currently at
> > > >
> > > > commit 1c514a7734b7f98625a0d18d5e8ee7581f26e50c
> > > > Merge: 79c097d 35bdc13
> > > > Author: Stefano Stabellini <address@hidden>
> > > > Date:   Tue Jun 25 11:34:24 2013 +0000
> > > >
> > > >      Merge remote branch 'perard/cpu-hotplug-port-v2' into
> > > > xen-staging-master-7
> > > >from git://xenbits.xen.org/qemu-upstream-unstable.git
> > > > My guest is Squeeze with stock kernel 2.6.32.
> > > >
> > > > vif=['model=virtio-net-pci,bridge=xenbr0']
> > > >
> > > > No pci=nomsi in guest kernel command line.
> > > >
> > > > Everything worked fine. And /proc/interrupts shows that it's indeed
> > > > using MSI for virtio PCI.
> > > >
> > > > I'm kind of confused. (And in the long run of this thread I probably
> > > > didn't remember everything.)
> > > >
> > > > Wei.
> > > I tried with "commit e16435c95be86244bd92c5c26579bd4298aa65a6
> > > (xen_disk: mark ioreq as mapped before unmapping in error case)"
> > >from git://xenbits.xen.org/qemu-upstream-4.3-testing.git.
> > > There are only 4 commits difference between mine and your test.
> > > FWIK the only other difference is domUs kernel versions, and the
> > > msi problem is probably a regression between kernel 2.6.32 and 3.2
> > > (the "older" domUs used in my tests was Precise with kernel 3.2).
> > > Tomorrow I'll try also with squeeze.
> > I tested with squeeze and with qemu 1.3.1, virtio net works also
> > without pci=nomsi, so seems kernel regression about msi using xen
> > (that make virtio devices not working) between versions 2.6.32 and
> > 3.2.
> > Any idea about solve it?
> 3.2 is still old to be honest. I don't think we have the bandwidth to
> look at it.
>
> It's never easy to debug problem involving several software components.
> The right thing to do is to use a) latest stable kernel tree which is
> still actively maintained, b) Linus's tree. Only those actively trees
> maintained / developed people have incentive / time to look at.
>
> If you're using a specific distro kernel, it would be probably helpful
> to report bug to that distro as well -- only if you're sure the bug
> you're seeing is distro kernel's bug.
>
> If you really want this feature so bad. I would sugguest you try latest
> stable kernel to see if it works. If not, you probably need to revisit
> your requirement and look for another route to achieve your goal.
>
> Wei.

Thanks for your reply.
About kernel msi regression I'll do other tests.
Could it be useful to try this patch:
https://bugzilla.kernel.org/attachment.cgi?id=113791
or is it totally unrelated?



About the other regression (the upstream qemu 1.6 regression that causes 
qemu crash with virtio net) can someone help me please?

> I did some other tests, I narrowed down the commit range to
> the one between:
>
> commit c9fea5d701f8fd33f0843728ec264d95cee3ed37 Mon, 22 Jul 2013
> 15:14:18 (Merge remote-tracking branch 'bonzini/iommu-for-anthony')
> where there is virtio net regression with xen
>
> and
>
> commit    962b03fcf509db25c847aa67c4eff574c240dcfe Thu, 4 Jul 2013
> 15:42:43 +0000 (xen: Mark fixed platform I/O as unaligned)
> where virtio net is working
>
> I also tested:
> commit 2562becfc126ed7678c662ee23b7c1fe135d8966 Mon, 15 Jul 2013
> 19:02:41 +0000
> and
> commit dcb117bfda5af6f6ceb7231778d36d8bce4aee93 Thu, 4 Jul 2013
> 15:42:46 +0000
> but qemu crashes on xl create for another error and I haven't found
> which is the commit to apply with git cherry-pick so that I can
> check if the virtio net regression is present.
>
> Can someone help me please?

Thanks for any reply.