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

[Fabio Fantoni <fabio.fantoni@xxxxxxx>]

Il 06/12/2013 16:39, Wei Liu ha scritto:
> On Fri, Dec 06, 2013 at 02:55:46PM +0000, Wei Liu wrote:
> > On Fri, Dec 06, 2013 at 03:49:30PM +0100, Fabio Fantoni wrote:
> > > Il 06/12/2013 15:40, Wei Liu ha scritto:
> > > > On Fri, Dec 06, 2013 at 02:51:50PM +0100, Fabio Fantoni wrote:
> > > > > Il 06/12/2013 14:17, Wei Liu ha scritto:
> > > > > > On Fri, Dec 06, 2013 at 02:10:24PM +0100, Fabio Fantoni wrote:
> > > > > > [...]
> > > > > > > I tried 2 cases with xen_emul_unplug=never:
> > > > > > > - with xen platform disabled (xen_platform_pci=0 plus konrad patch)
> > > > > > > and pci=nomsi
> > > > > > > - with xen_platform_pci=1 and without pci kernel parameter
> > > > > > > on both cases qemu crash with same error:
> > > > > > > xen_ram_addr_from_mapcache, could not find 0x7fdecf624968
> > > > > > >
> > > > > > > On your virtio net test you have added only 'model=virtio-net-pci'
> > > > > > > on vif line of domU's xl cfg or you did other changes?
> > > > > > No, nothing more. But I'm using Xen's QEMU upstream, not vanilla QEMU.
> > > > > I'm using xen's upstream qemu (master of
> > > > > git://xenbits.xen.org/qemu-upstream-unstable.git)
> > > > Not only the branch is important but also the changeset.
> > > >
> > > > I'm using the hash specified in Config.mk
> > > qemu of my tests about virtio:
> > > git log
> > > commit b97307ecaad98360f41ea36cd9674ef810c4f8cf
> > > Author: Matthew Daley <mattjd@xxxxxxxxx>
> > > Date:   Thu Oct 10 14:10:48 2013 +0000
> > >
> > >      xen_disk: mark ioreq as mapped before unmapping in error case
> > There's lots of changesets between this one and the one I use so doing
> > bisection is the only way to find out where the regression was
> > introduced.
> And, if you're really going to look into this I suggest you start with
> virtio related changesets, then Xen mapcache changesets (I suspect
> there's many changes to this code, but anyway it is worth looking at).
>
> Good luck.
>
> Wei.
Thanks for your reply.
Before starting bisection I tried with qemu 1.3.1 from 
qemu-upstream-4.3-testing.git
No more crash with virtio net but it needs pci=nomsi to be working, same 
thing for vdagent, so seems that msi problem is with all virtio devices.
Then the problems seem 2 different, on your build you have virtio 
devices working without setting pci=nomsi need to know the differences 
and find the cause.
About the crash of qemu 1.6.1 with virtio net is confirmed that is a 
regression, is not critical because is not implement on libxl now but 
I'll do further research.


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