linux-kernel - Re: [kvm-devel] [PATCH] export notifier #1

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Message-ID: <47974C78.7050509@qumranet.com>
Date:	Wed, 23 Jan 2008 16:17:28 +0200
From:	Avi Kivity <avi@...ranet.com>
To:	Robin Holt <holt@....com>
CC:	Gerd Hoffmann <kraxel@...hat.com>,
	Christoph Lameter <clameter@....com>,
	Andrea Arcangeli <andrea@...ranet.com>,
	Andrew Morton <akpm@...l.org>, Nick Piggin <npiggin@...e.de>,
	linux-mm@...ck.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	steiner@....com, linux-kernel@...r.kernel.org,
	kvm-devel@...ts.sourceforge.net, daniel.blueman@...drics.com,
	Hugh Dickins <hugh@...itas.com>
Subject: Re: [kvm-devel] [PATCH] export notifier #1

Robin Holt wrote:
> On Wed, Jan 23, 2008 at 01:51:23PM +0100, Gerd Hoffmann wrote:
>   
>> Jumping in here, looks like this could develop into a direction useful
>> for Xen.
>>
>> Background:  Xen has a mechanism called "grant tables" for page sharing.
>>  Guest #1 can issue a "grant" for another guest #2, which in turn then
>> can use that grant to map the page owned by guest #1 into its address
>> space.  This is used by the virtual network/disk drivers, i.e. typically
>> Domain-0 (which has access to the real hardware) maps pages of other
>> guests to fill in disk/network data.
>>     
>
> This is extremely similar to what XPMEM is providing.
>
>   

I think that in Xen's case the page tables are the normal cpu page 
tables, not an external mmu (like RDMA, kvm, and XPMEM).

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

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