On Tue, Oct 28, 2014 at 04:43:59PM +0530, Prerna Saxena wrote:
> Apologies, I accidentally posted the older version. Pls ignore the
> previously posted patch 2/3. The updated patch is here :
>
> >From a98d6787dc4f1d39ae36d78799ecf36018377ec7 Mon Sep 17 00:00:00 2001
> From: Prerna Saxena <prerna@xxxxxxxxxxxxxxxxxx>
> Date: Tue, 28 Oct 2014 15:05:59 +0530
> Subject: [PATCH 2/3] PowerPC : Add support for launching VMs in 'compat' mode.
>
> PowerISA allows processors to run VMs in binary compatibility ("compat")
> mode supporting an older version of ISA. QEMU has recently added support to
> explicitly denote a VM running in compatibility mode through commit 6d9412ea
> & 8dfa3a5e85.
> Now, a "compat" mode VM can be run by invoking this qemu commandline on a
> POWER8 host: -cpu host,compat=power7.
>
> This patch allows libvirt to extend the "fallback" semantics of cpu model to
> describe this new mode for PowerKVM guests.
> As an example:
> When a user wants to request a power7 vm to run in compatibility mode on
> a Power8 host, this can be described in XML as follows :
> <cpu mode='host-model' match='exact'>
> <model fallback='compat'>power7</model>
I don't really see any point in adding the fallback='compat'
attribute. That is basically always implied if you use
mode=host-model in combination with a named model.
Regards,
Daniel
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