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Date: Tue, 25 May 2010 16:57:45 +0300
From: Avi Kivity <avi@redhat.com>
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Subject: Re: [Qemu-devel] [RFC PATCH 1/1] ceph/rbd block driver for qemu-kvm
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To: Anthony Liguori <anthony@codemonkey.ws>
Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org, Blue Swirl <blauwirbel@gmail.com>, ceph-devel@vger.kernel.org, Christian Brunner <chb@muc.de>, MORITA Kazutaka <morita.kazutaka@lab.ntt.co.jp>

On 05/25/2010 04:54 PM, Anthony Liguori wrote:
> On 05/25/2010 08:36 AM, Avi Kivity wrote:
>>
>> We'd need a kernel-level generic snapshot API for this eventually.
>>
>>> or (2) implement BUSE to complement FUSE and CUSE to enable proper 
>>> userspace block devices.
>>
>> Likely slow due do lots of copying.  Also needs a snapshot API.
>
> The kernel could use splice.

Still can't make guest memory appear in (A)BUSE process memory without 
either mmu tricks (vmsplice in reverse) or a copy.  May be workable for 
an (A)BUSE driver that talks over a network, and thus can splice() its 
way out.

-- 
error compiling committee.c: too many arguments to function