Re: [Xen-devel]Two dead-lock situation occurs on 32bit HVM SMP Windows

[Keir Fraser <keir@xxxxxxxxxxxxx>]

On 14/11/06 17:42, "Li, Xin B" <xin.b.li@xxxxxxxxx> wrote:

>> Any idea what it's trying to access? Presumably nothing is
>> mapped up there
>> so it just gets all-ones back from reads? I'm surprised it
>> would be doing
>> lots of accesses to totally unused memory space. That tends to
>> be fairly
>> slow even on native hardware.
>> 
> 
> that are from detecting if a guest page table page is no longer a page
> table page, like in validate_gl4e.

I'll leave it to Tim to decide what the best thing to do here is. But I'm
sure we don't need a max_gpfn parameter. Xen could maintain its own
highwater mark, updated by the alloc_p2m path, if it needs it.

 -- Keir


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