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Re: [Qemu-devel] [PATCH v4 1/2] Force driftfix=none on previous machines

From: Daniel P. Berrange
Subject: Re: [Qemu-devel] [PATCH v4 1/2] Force driftfix=none on previous machines
Date: Wed, 20 Jun 2012 09:34:02 +0100
User-agent: Mutt/1.5.21 (2010-09-15)

On Tue, Jun 19, 2012 at 04:38:44PM -0300, Crístian Viana wrote:
> The current value for the -rtc driftfix option is 'none'. This patch
> makes sure that the old machines configuration will work the same way
> even after that option changes its default value.
> Signed-off-by: Crístian Viana <address@hidden>
> ---
> There's a scenario when things don't work the way I expected: when I set a
> previous machine with -M, the driftfix flag value on the command line is not
> used, the machine's default value overwrites it. I'm not sure if that's the
> expected behavior of QEMU in those cases (if I set a machine, I can't change 
> its
> properties) or if there's a bug somewhere. This is the question I asked in a
> previous e-mail (http://article.gmane.org/gmane.comp.emulators.qemu/149902).
> For example,
> $ x86_64-softmmu/qemu-x86_64 -M pc-1.0 --rtc driftfix=slew
> will use "driftfix=none", which is the default for the machine pc-1.0, not
> "driftfix=slew" as I set on the command line. That only happens if I choose
> a different machine than the default one (pc-1.1 as of now); otherwise it
> works fine.

I can't answer your question as to why this happens, but this is a
critical problem we must fix before merging this change. We need to
be able to set driftfix=slew for old machine types manually.

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