From: Alexey Kardashevskiy <aik@ozlabs.ru>
To: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: "Nikunj A Dadhania" <nikunj@linux.vnet.ibm.com>,
"Alexander Graf" <agraf@suse.de>,
qemu-devel@nongnu.org, qemu-ppc@nongnu.org,
"Paul Mackerras" <paulus@samba.org>,
"Andreas Färber" <afaerber@suse.de>
Subject: Re: [Qemu-devel] [RFC PATCH] spapr: add initial ibm, client-architecture-support rtas call support
Date: Wed, 04 Sep 2013 22:59:38 +1000 [thread overview]
Message-ID: <52272EBA.4080703@ozlabs.ru> (raw)
In-Reply-To: <1378295652.4321.18.camel@pasglop>
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.
--
Alexey
next prev parent reply other threads:[~2013-09-04 13:00 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-04 10:19 [Qemu-devel] [RFC PATCH] spapr: add initial ibm, client-architecture-support rtas call support Alexey Kardashevskiy
2013-09-04 10:42 ` Alexander Graf
2013-09-04 11:40 ` Alexey Kardashevskiy
2013-09-04 11:54 ` Benjamin Herrenschmidt
2013-09-04 12:59 ` Alexey Kardashevskiy [this message]
2013-09-04 12:13 ` Alexander Graf
2013-09-04 13:08 ` Alexey Kardashevskiy
2013-09-04 13:37 ` Alexander Graf
2013-09-04 21:32 ` Anthony Liguori
2013-09-05 10:16 ` Paul Mackerras
2013-09-05 10:19 ` Alexander Graf
2013-09-05 11:55 ` Paul Mackerras
2013-09-05 13:04 ` Alexander Graf
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=52272EBA.4080703@ozlabs.ru \
--to=aik@ozlabs.ru \
--cc=afaerber@suse.de \
--cc=agraf@suse.de \
--cc=benh@kernel.crashing.org \
--cc=nikunj@linux.vnet.ibm.com \
--cc=paulus@samba.org \
--cc=qemu-devel@nongnu.org \
--cc=qemu-ppc@nongnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.