[Xen-devel] [RFC 2/2] xen/public: grant-table: Specificy the size of the grant

[Julien Grall <julien.grall@xxxxxxxxxx>]

The grant is always 4KB irrespectively of the page granularity of the
guest.

Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
---

Cc: Ian Campbell <ian.campbell@xxxxxxxxxx>
Cc: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Keir Fraser <keir@xxxxxxx>
Cc: Tim Deegan <tim@xxxxxxx>
---
 xen/include/public/grant_table.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/xen/include/public/grant_table.h b/xen/include/public/grant_table.h
index e9393fd..67a250d 100644
--- a/xen/include/public/grant_table.h
+++ b/xen/include/public/grant_table.h
@@ -51,6 +51,11 @@
  * know the real machine address of a page it is sharing. This makes
  * it possible to share memory correctly with domains running in
  * fully virtualised memory.
+ *
+ * The size of a grant is always 4KB irrespectively of the page
+ * granularity of the guest. This is means that when the guest is using
+ * 64KB page granularity, it will have to split the page in 4KB chunks
+ * and request a grant for every of them.
  */
 
 /***********************************
-- 
2.1.4


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