Re: [Xen-devel] Grant tables from dom0 userspace?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 9 Mar 2006, at 17:59, Jacob Gorm Hansen wrote:

> I would like to share some pages between my domU graphics frontend
> device, and the backend which runs in userspace in dom0. Right now I
> am doing this with my own scheme, but presumably grant tables would be
> the correct solution.
>
> Is it possible to use grant tables from dom0 userspace? There used to
> be a file called tools/libxc/xc_gnttab.c but that seems to be gone
> now.
I think blktap gives an example how to do this, but it might be 
specific to aio right now. You could probably use some of the same 
hooks to provide a device file that you could mmap(), passing grant 
refs to map. I cc'ed Andy Warfield in case he has any ideas...
The only other supported mechanism is the xc_foreign mapping interfaces.

 -- Keir


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