Re: [Qemu-devel] latest rc: virtio-blk hangs forever after migration

[Andrey Korolyov <andrey@xdel.ru>]

On Thu, Sep 4, 2014 at 10:54 PM, Marcelo Tosatti <mtosatti@redhat.com> wrote:
> On Thu, Sep 04, 2014 at 03:54:01PM -0300, Marcelo Tosatti wrote:
>> On Thu, Sep 04, 2014 at 08:52:00PM +0400, Andrey Korolyov wrote:
>> > On Thu, Sep 4, 2014 at 8:38 PM, Marcelo Tosatti <mtosatti@redhat.com> wrote:
>> > > On Sun, Aug 24, 2014 at 10:51:38PM +0400, Andrey Korolyov wrote:
>> > >> On Sun, Aug 24, 2014 at 8:57 PM, Andrey Korolyov <andrey@xdel.ru> wrote:
>> > >> > On Sun, Aug 24, 2014 at 8:35 PM, Paolo Bonzini <pbonzini@redhat.com> wrote:
>> > >> >> Il 24/08/2014 18:19, Andrey Korolyov ha scritto:
>> > >> >>> Sorry, I was a bit inaccurate in my thoughts at Fri about necessary
>> > >> >>> amount of work, patch lays perfectly on 3.10 with bit of monkey
>> > >> >>> rewrites. The attached one fixed problem for me - it represents
>> > >> >>> 0b10a1c87a2b0fb459baaefba9cb163dbb8d3344,
>> > >> >>> 0bc830b05c667218d703f2026ec866c49df974fc,
>> > >> >>> 44847dea79751e95665a439f8c63a65e51da8e1f and
>> > >> >>> 673f7b4257a1fe7b181e1a1182ecc2b6b2b795f1.
>> > >> >>
>> > >> >> So, with these changes, Marcelo's patch does not hang up your guest anymore?
>> > >> >>
>> > >> >> Paolo
>> > >> >>
>> > >> >
>> > >> > If I may reword, Marcelo`s proposed states sync with revert-revert of
>> > >> > agraf`s patch, does not break anything for Windows (migration works
>> > >> > well for any variant of emulator with modified kernel modules). Let me
>> > >> > check if initially reported issue (lost I/O interrupts) is gone for
>> > >> > the current situation (patched kernel plus Marcelo` patch).
>> > >>
>> > >>
>> > >> patched kernel + any 2.1 variant + Windows = works
>> > >> patched kernel + patched 2.1 + Linux + disk workload = works fine
>> > >
>> > > Andrey,
>> > >
>> > > What patch is this again ?
>> > >
>> > >
>> >
>> > It is attached to the message which has a highest quoting order above
>> > 1), basically it is a monkey adaptation of newer ioapic patches for
>> > 3.10. RH kernel includes them, so Centos7/RH7 users should not observe
>> > reported problem.
>> >
>> > [1] https://www.mail-archive.com/qemu-devel@nongnu.org/msg252526.html
>> >
>> > Using the opportunity - what are plans, if there are any, to revive
>> > agraf`s patch which was the reason of an initial issue in this thread?
>> > The Windows issue is most probably unrelated to it and I`d be happy to
>> > check patch proposals because there are a lot of suffering with VMs
>> > with large uptime and live migration when negative time shift appears.
>>
>> I'll try to confirm via Marcin's testcase (vfio+VM migration on Linux guests),
>> that the proposed patch is fixing the issue.
>>
>> Getting a BSOD on Win2008-R2-x64 while trying to install virtio-win
>> driver (viostor related BSOD).
>
> What version of virtio-win are you using?
>

Bug appears on both 0.1.76 and 0.1.81 (and probably it is at least
specific to virtio, if not to more generic nature). BSOD sounds
strange for me, are you using virtio drivers at the install stage or
you trying to change the disk model after installation? I`ve never
went second way, so can`t tell if BSOD is here or not.