[Xen-devel] [PATCH v2 23/24] xen/arm: mm: Handle permission flags when adding a new mapping

[Julien Grall <julien.grall@xxxxxxx>]

Currently, all the new mappings will be read-write non-executable. Allow the
caller to use other permissions.

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

---
    Changes in v2:
        - Switch the runtime check to a BUG_ON()
---
 xen/arch/arm/mm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 8a56f37821..a6b228ba9b 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1022,6 +1022,9 @@ static int create_xen_entries(enum xenmap_operation op,
                 if ( op == RESERVE )
                     break;
                 pte = mfn_to_xen_entry(mfn, PAGE_AI_MASK(flags));
+                pte.pt.ro = PAGE_RO_MASK(flags);
+                pte.pt.xn = PAGE_XN_MASK(flags);
+                BUG_ON(!pte.pt.ro && !pte.pt.xn);
                 pte.pt.table = 1;
                 write_pte(entry, pte);
                 break;
-- 
2.11.0


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