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



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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