[Xen-devel] RE: A shadow bug?

["Li, Xin B" <xin.b.li@xxxxxxxxx>]

>
>At 16:49 +0800 on 14 Nov (1163522982), Li, Xin B wrote:
>> Hi Tim,
>> I'm running OLTP on x86_64 SMP FC5 HVM guest, but I saw this 
>messages on
>> guest console:
>> 
>> mysqld: Corrupted page table at address 2aaaae717000
>> PGD 33ae0067 PUD 33ae1067 PMD 2ea4c067 PTE 0
>> Bad pagetable: 000f [1] SMP
>
>Ah; it looks like x86_64 linux doesn't handle spurious 
>reserved-bit page
>faults.  Does this patch fix things for you?
>
>diff -r 032578b83641 xen/arch/x86/mm/shadow/multi.c
>--- a/xen/arch/x86/mm/shadow/multi.c    Tue Nov 14 10:39:49 2006 +0000
>+++ b/xen/arch/x86/mm/shadow/multi.c    Tue Nov 14 10:43:08 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 */
>
>

Yes, it's fixed.
thanks
-Xin

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