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Re: [Qemu-devel] [PULL 5/8] target-sparc: Use global registers for the r

From: Peter Maydell
Subject: Re: [Qemu-devel] [PULL 5/8] target-sparc: Use global registers for the register window
Date: Fri, 24 Jun 2016 09:12:48 +0100

On 24 June 2016 at 07:36, Paolo Bonzini <address@hidden> wrote:
> Mark, perhaps you can try to use migration to reduce the amount of
> logging?  (Start QEMU with -snapshot, try to stop the vm before it
> fails.  If you succeed, do a "migrate exec:cat>foo.sav" followed by
> "commit"; if you fail, try again).

Why drag migration into it? I usually use 'savevm' and then
the -loadvm command line argument for this. (You need a
qcow2 disk image.)

> It would be nice to have a mechanism to stop the VM after executing N
> basic blocks.  Binary search on this value then can help with coming up
> with a more easily debuggable snapshot, possibly to a point where the
> difference between pre-patch and post-patch becomes deterministic.

You can use the monitor and an expect script to say "take a
snapshot 0.7 seconds into boot", which I've found to be
a good enough approximation:


-- PMM

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