[Xen-devel] Re: RFC: Using grant table to give iomem permission

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 18/5/07 15:01, "Kieran Mansley" <kmansley@xxxxxxxxxxxxxx> wrote:

> When finished, the mapping domain can similarly unmap the grant, which
> removes its ability to ioremap() the page:
> struct gnttab_unmap_grant_ref op;
> gnttab_set_unmap_op(&op, 0, GNTMAP_iomem_map, handle);
> if (HYPERVISOR_grant_table_op(GNTTABOP_unmap_grant_ref, &op, 1))
> BUG();
> 
> Some questions from me:
>  - does this approach seem sane?

There's no reason you shouldn't be able to use GNTMAP_host_map as usual, and
do refcounting in the active grant entry, also as usual.

 -- Keir



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel