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

From: Avi Kivity
Date: Wed Jan 23 2008 - 09:17:42 EST


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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