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Re: [Qemu-ppc] [RFC PATCH] spapr: add initial ibm, client-architecture-s

From: Alexey Kardashevskiy
Subject: Re: [Qemu-ppc] [RFC PATCH] spapr: add initial ibm, client-architecture-support rtas call support
Date: Wed, 04 Sep 2013 22:59:38 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130625 Thunderbird/17.0.7

On 09/04/2013 09:54 PM, Benjamin Herrenschmidt wrote:
> On Wed, 2013-09-04 at 21:40 +1000, Alexey Kardashevskiy wrote:
>> One of the examples (came from Paul) is:
>> the host runs on POWER8, the guest boots a kernel which is capable of
>> POWER7 only + POWER7-compat. We do this reboot tweak and boot in
>> POWER7-compat mode. Then the guest does "yum update" and gets POWER8
>> kernel
>> installed so when it reboots, it will boot in normal POWER8 mode.
>> Everybody
>> is happy.
>> Having POWER7-compat mode set from the very beginning will break this
>> behaviour.
> But it will allow migrating that partition to a P7 machine. It's
> important to be able to specify the compat mode for that reason, to
> create guests that can be migrated to older machines.

I am not saying we do not need this feature, I am saying we do not always
want it.


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