Re: [Xen-devel] VT-VMX: monitor_table not zeroed when entering alloc_monitor_pagetable

[Khoa Huynh <khoa@xxxxxxxxxx>]

xen-devel-bounces@xxxxxxxxxxxxxxxxxxx wrote on 10/27/2005 06:20:34 PM:

>
> I'm hitting an ASSERT in alloc_monitor_pagetable() with debug=y and I
> can reproduce the condition when debug isn't on. The monitor_table is
> not zeroed when entering alloc_monitor_pagetable() - this happens when I
> create a vmx guest. I'm not sure why this happening at first glance.
>
> File: xen/arch/x86/shadow32.c
> Line: 689
> System: VT/VMX FC3 x86_32 (I can reproduce on FC4 x86_64 too)
>
> ASSERT(pagetable_get_paddr(v->arch.monitor_table) == 0);
>
> The monitor_table should be zeroed before coming into this function by
> free_monitor_pagetable(), unless monitor_vtable is already zeroed.
>
> File: xen/arch/x86/shadow32.c
> Line: 935
>
>         if ( v->arch.monitor_vtable )
>         {
>             free_monitor_pagetable(v);
>         }
>         if ( mode & SHM_external )
>         {
>             alloc_monitor_pagetable(v);
>         }
>
>
> Is anyone else seeing this problem?

Yes, I see this on my VT box running FC3/Xen as well.
I am currently looking into this.  Thanks.

Regards,

Khoa



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