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Re: [Xen-devel] Question about EPT translation

To: confucius <henanwxr@xxxxxxxxxxx>
Subject: Re: [Xen-devel] Question about EPT translation
From: Tim Deegan <tjd@xxxxxxxxxxxxxx>
Date: Mon, 30 May 2011 09:42:39 +0100
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At 09:17 -0700 on 27 May (1306487843), confucius wrote:
> Hi,everyone. I have some questions.
> 1. Does hvmoader need EPT for address translation when it  is running?

_All_ HVM guests need _either_ EPT/NPT _or_ shadow pagetables, to make
the extra translation from guest physical addresses to machine addresses.

> 3. If hvmloader needs EPT, where we construct EPT structure for it? I can't
> find correlative part  in code flow.

Did you try searching the code for "EPT"?  The EPT datastructures are
construced in p2m_ept.c.  (p2m is the general term in Xen for the table
that maps physical addresses to machine addresses).


                                         Tim Deegan <tjd@xxxxxxxxxxxxxx>
                We were back to the sad age-old knowledge that there are
                       only two genuine aphrodisiacs: youth and boredom.
                      [ Alistair Cooke, "Letter From America", 12/5/98 ]

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