Re:Re: Re:Re:Re: [Xen-devel] Questions about shadow page table.

["Wu Bingzheng" <wubingzheng@xxxxxxx>]

在2009-05-27，"Tim Deegan" <Tim.Deegan@xxxxxxxxxx> 写道：
>At 04:09 +0100 on 27 May (1243397391), Wu Bingzheng wrote:
>> In another word, how can page-fault handler distinguish the
>> shadow-page-fault and non-shadow-page-fault?
>
>By looking at the guest's own pagetables (not the shadows) and the error
>code, and figuring out whether this would have been a pagefault on bare
>metal.  Yes, the not_a_shadow_fault path is for this. 

Thanks. Would you like to point out where exactly to make the decision?
I guess this should be at the beginning of sh_page_fault(), and also out of 
the [#if SHADOW_OPTIMIZATIONS, #endif], but I didn't find it.
Is it sh_mfn_is_a_page_table() ? 

Thanks,
Wu


>
>> When reading it's code, I skip all the code enabled only #if
>> SHADOW_OPTIMIZATIONS, is that ok?
>
>You'll miss out on some quite major changes to the shadow code (the
>whole of what's been called "shadow 3"), but it should still make sense. 
>
>Cheers,
>
>Tim.
>
>-- 
>Tim Deegan <Tim.Deegan@xxxxxxxxxx>
>Principal Software Engineer, Citrix Systems (R&D) Ltd.
>[Company #02300071, SL9 0DZ, UK.]

---

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