Xen devel - Oct 2005 - VT-VMX: monitor_table not zeroed when entering alloc_monitor_pagetable

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? 

Thanks,

Dan


_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel

xen-devel-bounces@lists.xensource.com 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



_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xensource.com
http://lists.xensource.com/xen-devel