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xen/grant-table: Add an helper to iterate over a specific number of grants

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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 <julien.grall@citrix.com>
Signed-off-by: David Vrabel <david.vrabel@citrix.com>
This commit is contained in:
Julien Grall
2015-10-13 17:50:12 +01:00
committed by David Vrabel
parent 9cce2914e2
commit f73314b281
2 changed files with 28 additions and 0 deletions
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6
include/xen/grant_table.h
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@@ -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