Re: [Xen-staging] [xen-unstable] linux: User-space grant table device.

[Alex Williamson <alex.williamson@hp.com>]

On Sat, 2007-03-31 at 13:52 +0100, Xen staging patchbot-unstable wrote:
> # HG changeset patch
> # User Keir Fraser <keir@xensource.com>
> # Date 1175345604 -3600
> # Node ID 5e65a86c8982b9159223b542cc7b7e3af61a06e4
> # Parent  7180d2e61f926023e24750c53fd4203a71f2a3ae
> linux: User-space grant table device.
> 
> A character device for accessing (in user-space) pages that have been
> granted by other domains.
...
> +	/* This flag ensures that the page tables are not unpinned before the
> +	 * VM area is unmapped. Therefore Xen still recognises the PTE as
> +	 * belonging to an L1 pagetable, and the grant unmap operation will
> +	 * succeed, even if the process does not exit cleanly.
> +	 */
> +	vma->vm_mm->context.has_foreign_mappings = 1;

   mm_context_t is arch specific, common code shouldn't be poking at it
like this.

	Alex

-- 
Alex Williamson                             HP Open Source & Linux Org.