[Xen-devel] [PATCH 26/27] xen/arm: mm: Handling 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>
---
 xen/arch/arm/mm.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index cd7bcf7aca..fe0646002e 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1022,6 +1022,14 @@ 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);
+                if (  !pte.pt.ro && !pte.pt.xn )
+                {
+                    printk("%s: Incorrect combination for addr=%lx\n",
+                           __func__, addr);
+                    return -EINVAL;
+                }
                 pte.pt.table = 1;
                 write_pte(entry, pte);
                 break;
-- 
2.11.0


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