[Xen-changelog] [xen-unstable] x86/mm: Disable paging_prep

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
# Date 1326365550 0
# Node ID f04dfb11dd615b1a1dc194332255b90b11cf69e3
# Parent  75b8e982eb7e9346d157daf89a9b42f94fcab157
x86/mm: Disable paging_prep

The only way to page-in a page is now the safe paging_load domctl.
(Unless the page was never paged out in the first place)

Signed-off-by: Andres Lagar-Cavilla <andres@xxxxxxxxxxxxxxxx>
Acked-by: Tim Deegan <tim@xxxxxxx>
Committed-by: Tim Deegan <tim@xxxxxxx>
---


diff -r 75b8e982eb7e -r f04dfb11dd61 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c     Thu Jan 12 10:52:30 2012 +0000
+++ b/xen/arch/x86/mm/p2m.c     Thu Jan 12 10:52:30 2012 +0000
@@ -989,6 +989,10 @@
     /* Allocate a page if the gfn does not have one yet */
     if ( !mfn_valid(mfn) )
     {
+        /* If the user did not provide a buffer, we disallow */
+        ret = -EINVAL;
+        if ( unlikely(user_ptr == NULL) )
+            goto out;
         /* Get a free page */
         ret = -ENOMEM;
         page = alloc_domheap_page(p2m->domain, 0);

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