Re: [PATCH] export notifier #1

Avi Kivity
2008-01-23T14:17:28Z

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).

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