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Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc valu
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From: |
Marcelo Tosatti |
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Subject: |
Re: [Qemu-devel] [PATCH uq/master] kvmclock: Ensure proper env->tsc value for kvmclock_current_nsec calculation |
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Date: |
Tue, 15 Jul 2014 17:31:22 -0300 |
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User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Tue, Jul 15, 2014 at 10:15:14PM +0200, Paolo Bonzini wrote:
> Il 15/07/2014 22:03, Marcin Gibuła ha scritto:
> >>This causes a hang during migration, so I'll revert the patch from 2.1.
> >
> >For me this patch series fixed all hangs I had with migration (at least
> >with qemu 2.0).
>
> Unfortunately, someone else bisected their hangs exactly to this patch:
>
> http://permalink.gmane.org/gmane.comp.emulators.qemu/286681
>
> I could not reproduce that, but I couldn't reproduce yours either so
> I'm inclined to trust him and revert the patch.
This patch (or some form of updating env->tsc, see changelog)
is necessary.
I was just about to reproduce it.
Andrey, can you please provide the qemu command line ?
Can you attempt to start VM via command line and migrate
via QEMU monitor, then gdb -p to get a backtrace for all
threads ?