[Xen-devel] [for-4.7 v3 2/2] xen/arm: Document the behavior of XENMAPSPACE_dev_mmio

[Julien Grall <julien.grall@xxxxxxx>]

Currently, XENMAPSPACE_dev_mmio maps MMIO regions using one of the most
restrictive memory attribute (Device-nGnRE).

Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
Acked-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>

---
    Changes in v3:
        - Update comment
        - Add Stefano's Jan's ack

    Changes in v2:
        - s/Device_nGnRE/Device-nGnRE/ to match the spec
        - Update the comment to mention the name for ARMv7.
---
 xen/include/public/memory.h | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h
index 5f7e0d2..29ec571 100644
--- a/xen/include/public/memory.h
+++ b/xen/include/public/memory.h
@@ -220,7 +220,11 @@ DEFINE_XEN_GUEST_HANDLE(xen_machphys_mapping_t);
 #define XENMAPSPACE_gmfn_range   3 /* GMFN range, XENMEM_add_to_physmap only. 
*/
 #define XENMAPSPACE_gmfn_foreign 4 /* GMFN from another dom,
                                     * XENMEM_add_to_physmap_batch only. */
-#define XENMAPSPACE_dev_mmio     5 /* device mmio region */
+#define XENMAPSPACE_dev_mmio     5 /* device mmio region
+                                      ARM only; the region is mapped in
+                                      Stage-2 using the memory attribute
+                                      "Device-nGnRE" (previously named
+                                      "Device" on ARMv7) */
 /* ` } */
 
 /*
-- 
1.9.1


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