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List:       vbox-dev
Subject:    [vbox-dev] (no subject)
From:       <mgofman1 () binghamton ! edu>
Date:       2010-02-14 2:14:11
Message-ID: 20100213211411.DKL97369 () mpmail ! binghamton ! edu
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Thanks for the reply! 

I tried using PGMPhysGCPtr2GCPhys, but the returned value always seems to yield an \
error i.e. RT_SUCCESS(rc) never holds. I do not see what I am doing wrong.

Also, I tried using PGMR3DbgWriteGCPtr and I also have the same problem. Perhaps its \
because of the flags I am passing. Which flags should I pass to this function?

Could you please provide a working example if possible on how to properly call these \
functions?

Thanks for your helpful advice!

On Sat, Feb 13, 2010 at 3:25 PM, Knut St. Osmundsen <bird@sun.com> wrote:
> On Feb 13, 2010, at 5:46 AM, mgofman1@binghamton.edu wrote:
> 
> > Greetings,
> > 
> > I have a question regarding how to translate between different types of memory \
> > addresses in VirtualBox. I am looking for ways to translate from: 
> > * Guest Virtual Address ---> Guest Physical Address
> -> PGMPhysGCPtr2GCPhys
> 
> > * Guest Physical ---> Guest Virtual
> -> No API for this.
> 
> The simple implementation of this translation would be to scan all known guest page \
> tables, which would probably be extremely slow. We could maybe speed it up a bit by \
> first checking the shadowed page table backrefs for the guest physical page, but \
> the shadowed page tables lack information about their relation to virtual addresses \
> (they can be mapped into several paging hierarchies) and the information we find \
> there might easily be outdated or for a different memory context. This

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