From: Amit Shah <amit.shah@redhat.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-kernel@vger.kernel.org,
"Michael S. Tsirkin" <mst@redhat.com>,
levinsasha928@gmail.com,
Virtualization List <virtualization@lists.linux-foundation.org>
Subject: Re: [PATCH v4 00/12] virtio: s4 support
Date: Thu, 8 Dec 2011 17:26:40 +0530 [thread overview]
Message-ID: <20111208115640.GE23531@amit-x200.redhat.com> (raw)
In-Reply-To: <87liqoirgm.fsf@rustcorp.com.au>
On (Wed) 07 Dec 2011 [21:22:41], Rusty Russell wrote:
> On Wed, 7 Dec 2011 13:14:56 +0530, Amit Shah <amit.shah@redhat.com> wrote:
> > On (Wed) 07 Dec 2011 [17:54:29], Rusty Russell wrote:
> > > I figure there's a reason, but it seems a bit weird :)
> >
> > Well, there is one reason right now: migrating storage along with
> > VMs. The guest needs to sync all data to the disk before the target
> > host accesses the image file.
>
> I don't see why. Sure, if qemu (or whatever) is doing buffering, it
> needs to flush that. It doesn't, last I looked, it just maps to
> read/write.
>
> What am I missing?
I'm sorry, I got confused. The external file migration Gleb
mentioned, though, is something that libvirt uses right now and causes
guest time craziness so S4 is one (and natural) way to solve it.
Amit
next prev parent reply other threads:[~2011-12-08 11:56 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 [this message]
2011-12-07 10:44 ` Gleb Natapov
2011-12-07 13:43 ` Dor Laor
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