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

[Daniel P. Berrange]

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.


Daniel
-- 
|: http://berrange.com      -o-    http://www.flickr.com/photos/dberrange/ :|
|: http://libvirt.org              -o-             http://virt-manager.org :|
|: http://autobuild.org       -o-         http://search.cpan.org/~danberr/ :|
|: http://entangle-photo.org       -o-       http://live.gnome.org/gtk-vnc :|