[Xen-changelog] [xen-unstable] Nested p2m: clarify logic in p2m_get_nestedp2m()

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxx>
# Date 1309426014 -3600
# Node ID 4873ab6f347327e6e01eb546f362e94696151635
# Parent  e0d030d17e39ba57f563ae3f95bb410532ed1909
Nested p2m: clarify logic in p2m_get_nestedp2m()

This just makes the behaviour of this function a bit more explicit.  It
may be that it also needs to be changed. :)

Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxx>
Acked-by: Christoph Egger <Christoph.Egger@xxxxxxx>
---


diff -r e0d030d17e39 -r 4873ab6f3473 xen/arch/x86/mm/p2m.c
--- a/xen/arch/x86/mm/p2m.c     Thu Jun 30 10:26:54 2011 +0100
+++ b/xen/arch/x86/mm/p2m.c     Thu Jun 30 10:26:54 2011 +0100
@@ -1131,11 +1131,9 @@
 
     d = v->domain;
     nestedp2m_lock(d);
-    for (i = 0; i < MAX_NESTEDP2M; i++) {
-        p2m = d->arch.nested_p2m[i];
-        if ((p2m->cr3 != cr3 && p2m->cr3 != CR3_EADDR) || (p2m != nv->nv_p2m))
-            continue;
-
+    p2m = nv->nv_p2m;
+    if ( p2m && (p2m->cr3 == cr3 || p2m->cr3 == CR3_EADDR) )
+    {
         nv->nv_flushp2m = 0;
         p2m_getlru_nestedp2m(d, p2m);
         nv->nv_p2m = p2m;

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