[Xen-changelog] Fix writable pagetables for uniproc domains such that we don't use the

[BitKeeper Bot <riel@xxxxxxxxxxx>]

ChangeSet 1.1382, 2005/04/25 16:10:07+01:00, kaf24@xxxxxxxxxxxxxxxxxxxx

        Fix writable pagetables for uniproc domains such that we don't use the
        emulation path every time.
        Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>



 mm.c |    4 ++++
 1 files changed, 4 insertions(+)


diff -Nru a/xen/arch/x86/mm.c b/xen/arch/x86/mm.c
--- a/xen/arch/x86/mm.c 2005-04-25 12:03:21 -04:00
+++ b/xen/arch/x86/mm.c 2005-04-25 12:03:21 -04:00
@@ -2802,7 +2802,11 @@
      * update to ensure we make progress.
      */
     if ( d->arch.ptwr[which].prev_nr_updates == 0 )
+    {
+        /* Ensure that we don't get stuck in an emulation-only rut. */
+        d->arch.ptwr[which].prev_nr_updates = 1;
         goto emulate;
+    }
 
     d->arch.ptwr[which].l1va   = addr | 1;
     d->arch.ptwr[which].l2_idx = l2_idx;

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