[Xen-changelog] [xen-unstable] Nested p2m: flush only one p2m table when reallocating.

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxx>
# Date 1309426014 -3600
# Node ID 2115801e8e4786a666d768d7847721b7d5650275
# Parent  4873ab6f347327e6e01eb546f362e94696151635
Nested p2m: flush only one p2m table when reallocating.
It's unhelpful to flush all of them when we only need one.

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


diff -r 4873ab6f3473 -r 2115801e8e47 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
@@ -1120,7 +1120,6 @@
     volatile struct nestedvcpu *nv = &vcpu_nestedhvm(v);
     struct domain *d;
     struct p2m_domain *p2m;
-    int i;
 
     /* Mask out low bits; this avoids collisions with CR3_EADDR */
     cr3 &= ~(0xfffull);
@@ -1146,12 +1145,9 @@
     }
 
     /* All p2m's are or were in use. Take the least recent used one,
-     * flush it and reuse.
-     */
-    for (i = 0; i < MAX_NESTEDP2M; i++) {
-        p2m = p2m_getlru_nestedp2m(d, NULL);
-        p2m_flush_locked(p2m);
-    }
+     * flush it and reuse. */
+    p2m = p2m_getlru_nestedp2m(d, NULL);
+    p2m_flush_locked(p2m);
     nv->nv_p2m = p2m;
     p2m->cr3 = cr3;
     nv->nv_flushp2m = 0;

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