From: Rusty Russell <rusty@rustcorp.com.au>
To: Amit Shah <amit.shah@redhat.com>
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: Wed, 07 Dec 2011 21:22:41 +1030 [thread overview]
Message-ID: <87liqoirgm.fsf@rustcorp.com.au> (raw)
In-Reply-To: <20111207074456.GD4651@amit-x200.redhat.com>
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?
Thanks,
Rusty.
WARNING: multiple messages have this Message-ID (diff)
From: Rusty Russell <rusty@rustcorp.com.au>
To: Amit Shah <amit.shah@redhat.com>
Cc: Virtualization List <virtualization@lists.linux-foundation.org>,
"Michael S. Tsirkin" <mst@redhat.com>,
levinsasha928@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v4 00/12] virtio: s4 support
Date: Wed, 07 Dec 2011 21:22:41 +1030 [thread overview]
Message-ID: <87liqoirgm.fsf@rustcorp.com.au> (raw)
In-Reply-To: <20111207074456.GD4651@amit-x200.redhat.com>
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?
Thanks,
Rusty.
next prev parent reply other threads:[~2011-12-07 10:52 UTC|newest]
Thread overview: 72+ 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 ` Amit Shah
2011-12-06 19:48 ` [PATCH v4 01/12] virtio: pci: switch to new PM API Amit Shah
2011-12-06 19:48 ` Amit Shah
2011-12-06 22:12 ` Rafael J. Wysocki
2011-12-06 22:12 ` Rafael J. Wysocki
2011-12-07 3:57 ` Amit Shah
2011-12-07 3:57 ` Amit Shah
2011-12-07 9:48 ` Rafael J. Wysocki
2011-12-07 9:48 ` Rafael J. Wysocki
2011-12-07 9:52 ` Amit Shah
2011-12-07 9:52 ` Amit Shah
2011-12-07 10:16 ` Rafael J. Wysocki
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 ` 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 ` Amit Shah
2011-12-06 19:48 ` [PATCH v4 04/12] virtio: console: Add freeze and restore handlers to support S4 Amit Shah
2011-12-06 19:48 ` Amit Shah
2011-12-07 10:43 ` Michael S. Tsirkin
2011-12-07 10:43 ` Michael S. Tsirkin
2011-12-07 10:59 ` Amit Shah
2011-12-07 10:59 ` Amit Shah
2011-12-07 15:54 ` Michael S. Tsirkin
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 ` Amit Shah
2011-12-06 19:48 ` [PATCH v4 06/12] virtio: blk: Add freeze, restore handlers to support S4 Amit Shah
2011-12-06 19:48 ` Amit Shah
2011-12-07 10:37 ` Michael S. Tsirkin
2011-12-07 10:37 ` Michael S. Tsirkin
2011-12-07 10:56 ` Amit Shah
2011-12-07 10:56 ` Amit Shah
2011-12-07 15:58 ` Michael S. Tsirkin
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 ` 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 ` Amit Shah
2011-12-06 19:48 ` [PATCH v4 09/12] virtio: net: Add freeze, restore handlers to support S4 Amit Shah
2011-12-06 19:48 ` Amit Shah
2011-12-07 10:28 ` Michael S. Tsirkin
2011-12-07 10:28 ` Michael S. Tsirkin
2011-12-07 10:35 ` Amit Shah
2011-12-07 10:35 ` Amit Shah
2011-12-07 11:46 ` Michael S. Tsirkin
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 ` 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 ` Amit Shah
2011-12-06 19:48 ` [PATCH v4 12/12] virtio: balloon: Add freeze, restore handlers to support S4 Amit Shah
2011-12-06 19:48 ` Amit Shah
2011-12-07 4:50 ` Amit Shah
2011-12-07 4:50 ` Amit Shah
2011-12-07 10:34 ` (resend) " Michael S. Tsirkin
2011-12-07 10:34 ` Michael S. Tsirkin
2011-12-07 10:39 ` Amit Shah
2011-12-07 10:39 ` Amit Shah
2011-12-07 7:24 ` [PATCH v4 00/12] virtio: s4 support Rusty Russell
2011-12-07 7:44 ` Amit Shah
2011-12-07 7:44 ` Amit Shah
2011-12-07 10:52 ` Rusty Russell [this message]
2011-12-07 10:52 ` Rusty Russell
2011-12-08 11:56 ` Amit Shah
2011-12-08 11:56 ` Amit Shah
2011-12-07 10:44 ` Gleb Natapov
2011-12-07 10:44 ` Gleb Natapov
2011-12-07 13:43 ` Dor Laor
2011-12-07 13:43 ` Dor Laor
2011-12-07 7:24 ` Rusty Russell
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