From: Paolo Bonzini <pbonzini@redhat.com>
To: Hu Tao <hutao@cn.fujitsu.com>
Cc: Peter Maydell <peter.maydell@linaro.org>,
Gleb Natapov <gleb@redhat.com>,
"Michael S. Tsirkin" <mst@redhat.com>,
Jan Kiszka <jan.kiszka@siemens.com>,
qemu-devel <qemu-devel@nongnu.org>,
Markus Armbruster <armbru@redhat.com>,
Blue Swirl <blauwirbel@gmail.com>,
Orit Wasserman <owasserm@redhat.com>,
kvm list <kvm@vger.kernel.org>,
Juan Quintela <quintela@redhat.com>,
Alexander Graf <agraf@suse.de>, Andrew Jones <drjones@redhat.com>,
Alex Williamson <alex.williamson@redhat.com>,
Sasha Levin <levinsasha928@gmail.com>,
Stefan Hajnoczi <stefanha@redhat.com>,
Luiz Capitulino <lcapitulino@redhat.com>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Kevin Wolf <kwolf@redhat.com>,
Anthony Liguori <aliguori@us.ibm.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [Qemu-devel] [PATCH v13 1/8] save/load cpu runstate
Date: Tue, 05 Mar 2013 09:24:24 +0100 [thread overview]
Message-ID: <5135ABB8.5070202@redhat.com> (raw)
In-Reply-To: <20130305023308.GK16362@localhost.localdomain>
Il 05/03/2013 03:33, Hu Tao ha scritto:
> On Mon, Mar 04, 2013 at 10:30:48AM +0100, Paolo Bonzini wrote:
>> Il 28/02/2013 13:13, Hu Tao ha scritto:
>>> This patch enables preservation of cpu runstate during save/load vm.
>>> So when a vm is restored from snapshot, the cpu runstate is restored,
>>> too.
>>
>> I don't think this feature is worth breaking backwards migration
>> compatibility. It is usually handled at a higher-level (management,
>> like libvirt).
>
> If guest panic happens during migration, runstate will still be running
> on destination host without this patch. But, it does be a problem to break
> backwards migration compatibility.
Yes, but the source management (libvirt for example) will have the
occasion to observe the change and cancel the migration or forward the
information on the wire. There are already similar reasons why libvirt
always starts guests with -S.
Paolo
next prev parent reply other threads:[~2013-03-05 8:24 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1362051581.git.hutao@cn.fujitsu.com>
[not found] ` <664d63ad19ae6ec25a5a7bd6411c8ab7e289f632.1362051582.git.hutao@cn.fujitsu.com>
2013-03-01 16:31 ` [Qemu-devel] [PATCH v13 5/8] add a new qevent: QEVENT_GUEST_PANICKED Eric Blake
2013-03-05 3:17 ` Hu Tao
2013-03-04 9:40 ` Paolo Bonzini
2013-03-03 9:17 ` [Qemu-devel] [PATCH v13 0/8] pv event interface between host and guest Gleb Natapov
2013-03-04 10:05 ` Paolo Bonzini
2013-03-04 10:21 ` Gleb Natapov
2013-03-04 10:28 ` Paolo Bonzini
2013-03-04 10:43 ` Gleb Natapov
2013-03-04 10:49 ` Paolo Bonzini
2013-03-04 10:59 ` Gleb Natapov
2013-03-04 11:10 ` Paolo Bonzini
2013-03-04 11:20 ` Gleb Natapov
2013-03-04 11:35 ` Paolo Bonzini
2013-03-04 11:52 ` Gleb Natapov
2013-03-04 12:21 ` Paolo Bonzini
2013-03-06 8:56 ` Hu Tao
2013-03-06 9:07 ` Paolo Bonzini
2013-03-06 9:28 ` li guang
2013-03-06 9:38 ` Gleb Natapov
2013-03-06 9:48 ` Paolo Bonzini
2013-03-06 9:59 ` Gleb Natapov
2013-03-06 8:46 ` Hu Tao
2013-03-06 9:37 ` Gleb Natapov
[not found] ` <df20999140db716e8b1ccd57a7cbcb0fa343a78c.1362051582.git.hutao@cn.fujitsu.com>
[not found] ` <512FC845.9080209@redhat.com>
2013-03-01 7:36 ` [Qemu-devel] [PATCH v13 1/8] save/load cpu runstate Hu Tao
2013-03-01 16:29 ` Eric Blake
2013-03-04 9:30 ` Paolo Bonzini
2013-03-05 2:33 ` Hu Tao
2013-03-05 8:24 ` Paolo Bonzini [this message]
[not found] ` <d1f8b5689b05b9db923d86941e914d08ac4c2b7c.1362051582.git.hutao@cn.fujitsu.com>
2013-03-04 9:32 ` [Qemu-devel] [PATCH v13 2/8] start vm after resetting it Paolo Bonzini
2013-03-05 3:06 ` Hu Tao
[not found] ` <512F5A5E.9020504@siemens.com>
2013-03-05 3:05 ` Hu Tao
[not found] ` <ab47cb1ef5a962848b2390d5b602b36aca1f149a.1362051582.git.hutao@cn.fujitsu.com>
2013-03-04 9:40 ` [Qemu-devel] [PATCH v13 4/8] add a new runstate: RUN_STATE_GUEST_PANICKED Paolo Bonzini
2013-03-05 3:17 ` Hu Tao
2013-03-05 8:26 ` Paolo Bonzini
2013-03-06 9:03 ` Hu Tao
[not found] ` <d7b92bed37f3669194b45acd8736b4b7ac71cc95.1362051582.git.hutao@cn.fujitsu.com>
2013-03-04 9:42 ` [Qemu-devel] [PATCH v13 6/8] introduce a new qom device to deal with panicked event Paolo Bonzini
2013-03-04 10:10 ` Christian Borntraeger
2013-03-04 10:21 ` Paolo Bonzini
[not found] ` <1af3c134891e119a21268ac6c48434447a8f6ab2.1362051582.git.hutao@cn.fujitsu.com>
2013-03-04 9:47 ` [Qemu-devel] [PATCH v13 7/8] allower the user to disable pv event support Paolo Bonzini
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