Re: [Qemu-stable] Patch Round-up for stable 2.1.1, freeze on 2014-09-03

[Andrey Korolyov]

On Wed, Sep 3, 2014 at 2:09 AM, Andrey Korolyov <address@hidden> wrote:
> On Wed, Sep 3, 2014 at 1:51 AM, Michael S. Tsirkin <address@hidden> wrote:
>> On Wed, Sep 03, 2014 at 01:29:29AM +0400, Andrey Korolyov wrote:
>>> On Wed, Sep 3, 2014 at 1:03 AM, Michael S. Tsirkin <address@hidden> wrote:
>>> >> bad one is the
>>> >>
>>> >> Author: Jason Wang <address@hidden>
>>> >> Date:   Tue Sep 2 18:07:46 2014 +0300
>>> >>
>>> >>     vhost_net: start/stop guest notifiers properly
>>> >
>>> >
>>> >
>>> > upstream has this (pull request sent today):
>>> > vhost_net: cleanup start/stop condition
>>> >
>>> > Could you apply it and see if it helps please?
>>> >
>>> > Michael, if it helps it should be before start/stop guest notifiers
>>> > ideally to avoid bisect problems.
>>>
>>> It is already applied as shown from the list in the previous message
>>> (there are some aio fixes too on top of 2.1 I picked before but they
>>> should not impact vhost-net interaction in any mean). The symptoms are
>>> a bit interesting - VM crashes only at PCI device initalization (e.g.
>>> grub stage after reset and initrd unpacking are passing well, but then
>>> things getting ugly). I am running 3.14 guest i686-pae kernel from
>>> debian backports in guest, so it may be version-specific after all. If
>>> it`ll be hard to reproduce, I can try 64bit, expecting same behavior.
>>> Please find args in attached file.
>>
>>
>>
>> ok just to make sure - which tree do I clone exactly?
>>
>
> https://github.com/mdroth/qemu.git stable-2.1-staging showing same
> behavior for me with those patches

Forgot to mention important detail - I am playing with -mq now, so
actually virtio-net working in a bit different way than it may
expected (it also shown in args list from above, but someone may miss
it):
...
qemu-system-x86_64: unable to start vhost net: 95: falling back on
userspace virtio
qemu-system-x86_64: unable to start vhost net: 95: falling back on
userspace virtio
...