diff mbox

[v3,8/9] xen/arm: mm: Handle permission flags when adding a new mapping

Message ID 20171002173150.5404-9-julien.grall@arm.com (mailing list archive)
State New, archived
Headers show

Commit Message

Julien Grall Oct. 2, 2017, 5:31 p.m. UTC 
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@arm.com>

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

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 117f05a1d6..57afedf0be 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;