[Xen-changelog] [xen-unstable] Support for Memory paging in grant table mappings.

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1261031275 0
# Node ID 3b29ed4ffb15372ce6fea41dec1b796e2f6fec81
# Parent  410eb65969cb142b8b32490d7f1454859cc3a7f2
Support for Memory paging in grant table mappings.

Signed-off-by: Patrick Colp <Patrick.Colp@xxxxxxxxxx>
---
 xen/common/grant_table.c |   20 ++++++++++++++++++--
 1 files changed, 18 insertions(+), 2 deletions(-)

diff -r 410eb65969cb -r 3b29ed4ffb15 xen/common/grant_table.c
--- a/xen/common/grant_table.c  Thu Dec 17 06:27:55 2009 +0000
+++ b/xen/common/grant_table.c  Thu Dec 17 06:27:55 2009 +0000
@@ -1873,7 +1873,15 @@ __gnttab_copy(
     }
     else
     {
-        s_frame = gmfn_to_mfn(sd, op->source.u.gmfn);
+        p2m_type_t p2mt;
+        s_frame = mfn_x(gfn_to_mfn(sd, op->source.u.gmfn, &p2mt));
+        if ( p2m_is_paging(p2mt) )
+        {
+            p2m_mem_paging_populate(sd, op->source.u.gmfn);
+
+            rc = -ENOENT;
+            goto error_out;
+        }
         source_domain = sd;
     }
     if ( unlikely(!mfn_valid(s_frame)) )
@@ -1906,7 +1914,15 @@ __gnttab_copy(
     }
     else
     {
-        d_frame = gmfn_to_mfn(dd, op->dest.u.gmfn);
+        p2m_type_t p2mt;
+        d_frame = mfn_x(gfn_to_mfn(dd, op->dest.u.gmfn, &p2mt));
+        if ( p2m_is_paging(p2mt) )
+        {
+            p2m_mem_paging_populate(dd, op->dest.u.gmfn);
+
+            rc = -ENOENT;
+            goto error_out;
+        }
         dest_domain = dd;
     }
     if ( unlikely(!mfn_valid(d_frame)) )

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