From: Julien Grall <julien.grall@linaro.org>
Date: Tue, 17 Dec 2013 16:27:58 +0000 (+0000)
Subject: xen/arm: grant-table: Support read-only mapping
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~5729
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=9383b2cc52629d77879952fda712463871ea2fe7;p=xen.git

xen/arm: grant-table: Support read-only mapping

Signed-off-by: Julien Grall <julien.grall@linaro.org>
Acked-by: Ian Campbell <ian.campbell@citrix.com>
---

diff --git a/xen/arch/arm/mm.c b/xen/arch/arm/mm.c
index 8250e65d02..3d0b8540fd 100644
--- a/xen/arch/arm/mm.c
+++ b/xen/arch/arm/mm.c
@@ -1306,19 +1306,17 @@ int create_grant_host_mapping(unsigned long addr, unsigned long frame,
                               unsigned int flags, unsigned int cache_flags)
 {
     int rc;
+    p2m_type_t t = p2m_grant_map_rw;
 
     if ( cache_flags  || (flags & ~GNTMAP_readonly) != GNTMAP_host_map )
         return GNTST_general_error;
 
-    /* XXX: read only mappings */
     if ( flags & GNTMAP_readonly )
-    {
-        gdprintk(XENLOG_WARNING, "read only mappings not implemented yet\n");
-        return GNTST_general_error;
-    }
+        t = p2m_grant_map_ro;
+
+    rc = guest_physmap_add_entry(current->domain, addr >> PAGE_SHIFT,
+                                 frame, 0, t);
 
-    rc = guest_physmap_add_page(current->domain,
-                                 addr >> PAGE_SHIFT, frame, 0);
     if ( rc )
         return GNTST_general_error;
     else