linux-kernel - Re: [PATCH v4 00/12] virtio: s4 support

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Message-ID: <87liqoirgm.fsf@rustcorp.com.au>
Date:	Wed, 07 Dec 2011 21:22:41 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Amit Shah <amit.shah@...hat.com>
Cc:	Virtualization List <virtualization@...ts.linux-foundation.org>,
	"Michael S. Tsirkin" <mst@...hat.com>, levinsasha928@...il.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 00/12] virtio: s4 support

On Wed, 7 Dec 2011 13:14:56 +0530, Amit Shah <amit.shah@...hat.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.
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