[vbox-dev] Running Guest Ring 0 Code Natively

[Ryan Riley]

Sorry, typo in my last post.  By VMMR3HwAccRunGC() I mean VMMR3RawRunGC().

Thanks
Ryan

On Nov 8, 2007 12:23 PM, Ryan Riley <rileyrd at gmail.com> wrote:
> I've been staring at that for a while and I think I've realized I may
> be trying to go about this the wrong way.  Let me try a different
> question a different way.  I have a list of memory pages that, if
> executed from, need to be executed using the recompiler.  I want to
> ensure that any instructions off of those pages are never run in raw
> mode.
>
> The trouble I'm having is determining, before the call to
> VMMR3HwAccRunGC(), which instructions may be run in raw mode by that
> call.  I don't even need it to be exact, I just need to know if one of
> the pages in my list has the potential to have code executed off of
> it.
>
> Thanks
> Ryan
>
>
> On Nov 8, 2007 5:45 AM, Sander van Leeuwen <sandervl at innotek.de> wrote:
> > We already have code in place which does exactly that. There are limits
> > as to how much you can scan though.
> > See /src/VBox/VMM/PATM/CSAM.cpp, CSAMR3CheckCodeEx. Called before
> > executing ring 0 code in
> > raw mode (/src/VBox/VMM/EM.cpp).
> >
> >
> > Ryan Riley wrote:
> > > I'm doing a small hack on VirtualBox for a local research project and
> > > was hoping someone could point me in the right direction for what I
> > > want to do.  Basically, before a piece of guest ring 0 code gets
> > > executed, I want to know what addresses may potentially get run.  I
> > > can do this fairly easily by setting pVM->fRawR0Enabled=false and
> > > hacking the recompiler to check each instruction before translating it
> > > (which is what I do now) but for performance reasons I would really
> > > like to scan the code right before execution and let it run natively
> > > if there are no problems.  Does anyone have any thoughts on where I
> > > could get started?
> > >
> > > Thanks
> > > Ryan
> > >
> > > _______________________________________________
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> > >
> >
> >
> > --
> > Kind regards / mit freundlichen Gruessen / Met vriendelijke groet
> >    Sander van Leeuwen
> >
> > innoTek GmbH
> > sandervl at innotek.de
> > http://www.innotek.de
> > Germany
> >
> >
> >
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>