From f73314b28148f9ee9f89a0ae961c8fb36e3269fa Mon Sep 17 00:00:00 2001 From: Julien Grall Date: Tue, 13 Oct 2015 17:50:12 +0100 Subject: xen/grant-table: Add an helper to iterate over a specific number of grants With the 64KB page granularity support on ARM64, a Linux page may be split accross multiple grant. Currently we have the helper gnttab_foreach_grant_in_grant to break a Linux page based on an offset and a len, but it doesn't fit when we only have a number of grants in hand. Introduce a new helper which take an array of Linux page and a number of grant and will figure out the address of each grant. Signed-off-by: Julien Grall Signed-off-by: David Vrabel --- include/xen/grant_table.h | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'include/xen/grant_table.h') diff --git a/include/xen/grant_table.h b/include/xen/grant_table.h index e17a4b381a16..34b1379f9777 100644 --- a/include/xen/grant_table.h +++ b/include/xen/grant_table.h @@ -264,6 +264,12 @@ static inline void gnttab_for_one_grant(struct page *page, unsigned int offset, gnttab_foreach_grant_in_range(page, offset, len, fn, data); } +/* Get @nr_grefs grants from an array of page and call fn for each grant */ +void gnttab_foreach_grant(struct page **pages, + unsigned int nr_grefs, + xen_grant_fn_t fn, + void *data); + /* Get the number of grant in a specified region * * start: Offset from the beginning of the first page -- cgit v1.2.1