From: Dor Laor <dlaor@redhat.com>
To: Gleb Natapov <gleb@redhat.com>
Cc: "Michael S. Tsirkin" <mst@redhat.com>,
linux-kernel@vger.kernel.org,
Virtualization List <virtualization@lists.linux-foundation.org>,
levinsasha928@gmail.com, Amit Shah <amit.shah@redhat.com>
Subject: Re: [PATCH v4 00/12] virtio: s4 support
Date: Wed, 07 Dec 2011 15:43:02 +0200 [thread overview]
Message-ID: <4EDF6D66.5030003@redhat.com> (raw)
In-Reply-To: <20111207104459.GR12507@redhat.com>
On 12/07/2011 12:44 PM, Gleb Natapov wrote:
> On Wed, Dec 07, 2011 at 05:54:29PM +1030, Rusty Russell wrote:
>> On Wed, 7 Dec 2011 01:18:38 +0530, Amit Shah<amit.shah@redhat.com> wrote:
>>> Hi,
>>>
>>> These patches add support for S4 to virtio (pci) and all drivers.
>>
>> Dumb meta-question: why do we want to hibernate virtual machines?
>>
> For instance you want to hibernate your laptop while it is running a virtual
> machine. You can pause them of course, but then time will be incorrect
> inside a guest after resume.
Exactly. Today with do that through live migration into a file, we call
it external hibernation. The problem that it is transparent from the
guest and thus it loses time keeping. Even NTP can't handle it since if
it has more than 0.5% delay it stops syncing.
The solution is to do it through s4 where the guest gets a notification
when it resumes.
>
>> I figure there's a reason, but it seems a bit weird :)
>>
>> Thanks,
>> Rusty.
>> --
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>
> --
> Gleb.
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prev parent reply other threads:[~2011-12-07 13:43 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-06 19:48 [PATCH v4 00/12] virtio: s4 support Amit Shah
2011-12-06 19:48 ` [PATCH v4 01/12] virtio: pci: switch to new PM API Amit Shah
2011-12-06 22:12 ` Rafael J. Wysocki
2011-12-07 3:57 ` Amit Shah
2011-12-07 9:48 ` Rafael J. Wysocki
2011-12-07 9:52 ` Amit Shah
2011-12-07 10:16 ` Rafael J. Wysocki
2011-12-06 19:48 ` [PATCH v4 02/12] virtio: pci: add PM notification handlers for restore, freeze, thaw, poweroff Amit Shah
2011-12-06 19:48 ` [PATCH v4 03/12] virtio: console: Move out vq and vq buf removal into separate functions Amit Shah
2011-12-06 19:48 ` [PATCH v4 04/12] virtio: console: Add freeze and restore handlers to support S4 Amit Shah
2011-12-07 10:43 ` Michael S. Tsirkin
2011-12-07 10:59 ` Amit Shah
2011-12-07 15:54 ` Michael S. Tsirkin
2011-12-06 19:48 ` [PATCH v4 05/12] virtio: blk: Move out vq initialization to separate function Amit Shah
2011-12-06 19:48 ` [PATCH v4 06/12] virtio: blk: Add freeze, restore handlers to support S4 Amit Shah
2011-12-07 10:37 ` Michael S. Tsirkin
2011-12-07 10:56 ` Amit Shah
2011-12-07 15:58 ` Michael S. Tsirkin
2011-12-06 19:48 ` [PATCH v4 07/12] virtio: net: Move out vq initialization into separate function Amit Shah
2011-12-06 19:48 ` [PATCH v4 08/12] virtio: net: Move out vq and vq buf removal " Amit Shah
2011-12-06 19:48 ` [PATCH v4 09/12] virtio: net: Add freeze, restore handlers to support S4 Amit Shah
2011-12-07 10:28 ` Michael S. Tsirkin
2011-12-07 10:35 ` Amit Shah
2011-12-07 11:46 ` Michael S. Tsirkin
2011-12-06 19:48 ` [PATCH v4 10/12] virtio: balloon: ensure thread exists before stopping it Amit Shah
2011-12-06 19:48 ` [PATCH v4 11/12] virtio: balloon: Move out vq initialization into separate function Amit Shah
2011-12-06 19:48 ` [PATCH v4 12/12] virtio: balloon: Add freeze, restore handlers to support S4 Amit Shah
2011-12-07 4:50 ` Amit Shah
2011-12-07 10:34 ` (resend) " Michael S. Tsirkin
2011-12-07 10:39 ` Amit Shah
2011-12-07 7:24 ` [PATCH v4 00/12] virtio: s4 support Rusty Russell
[not found] ` <87wra8j13m.fsf@rustcorp.com.au>
2011-12-07 7:44 ` Amit Shah
2011-12-07 10:52 ` Rusty Russell
2011-12-08 11:56 ` Amit Shah
2011-12-07 10:44 ` Gleb Natapov
2011-12-07 13:43 ` Dor Laor [this message]
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