From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christoph Hellwig <hch@infradead.org>
Subject: Re: the >1Tb  block issue
Date: Wed, 19 May 2010 04:57:22 -0400
Message-ID: <20100519085722.GA4343@infradead.org>
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Cc: Michael Tokarev <mjt@tls.msk.ru>, KVM list <kvm@vger.kernel.org>,
	Christoph Hellwig <hch@lst.de>
To: Avi Kivity <avi@redhat.com>
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On Tue, May 18, 2010 at 08:38:22PM +0300, Avi Kivity wrote:
> Yes.  Why would Linux post overlapping requests? makes  
> 0xffffffff00000000 sense.
>
> There may be a guest bug in here too.  Christoph?

Overlapping writes are entirely fine from the guest POV, although they
should be rather unusual.  We can update a page and send it out again
when it gets redirtied while still out on the wire.