[Xen-changelog] [xen-unstable] [XEN] Don't pass spurious reserved-bit faults to the guest

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

# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
# Node ID bcebb04c65c8161970496153ae0c7f21b095874b
# Parent  d6f54576ac229d3c87d53e8242d45e4695695f0a
[XEN] Don't pass spurious reserved-bit faults to the guest
since x86_64 linux can't handle them.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
---
 xen/arch/x86/mm/shadow/multi.c |    4 ++++
 1 files changed, 4 insertions(+)

diff -r d6f54576ac22 -r bcebb04c65c8 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c    Tue Nov 14 11:47:26 2006 +0000
+++ b/xen/arch/x86/mm/shadow/multi.c    Tue Nov 14 11:52:38 2006 +0000
@@ -2623,6 +2623,10 @@ static int sh_page_fault(struct vcpu *v,
              * Fall through to the normal fault handing logic */
             perfc_incrc(shadow_fault_fast_fail);
             SHADOW_PRINTK("fast path false alarm!\n");
+            /* Don't pass the reserved-bit bit: if we look at the fault 
+             * below and decide to pass it to the guest, the reserved-bit
+             * bit won't make sense there. */
+            regs->error_code &= ~PFEC_reserved_bit;
         }
     }
 #endif /* SHOPT_FAST_FAULT_PATH */

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