linux-kernel - Re: [RFC v3][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel support

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Date:	Tue, 12 May 2009 11:55:28 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Cihula, Joseph" <joseph.cihula@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"arjan@...ux.intel.com" <arjan@...ux.intel.com>,
	"hpa@...or.com" <hpa@...or.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"chrisw@...s-sol.org" <chrisw@...s-sol.org>,
	"jmorris@...ei.org" <jmorris@...ei.org>,
	"jbeulich@...ell.com" <jbeulich@...ell.com>,
	"peterm@...hat.com" <peterm@...hat.com>,
	"Wei, Gang" <gang.wei@...el.com>,
	"Wang, Shane" <shane.wang@...el.com>
Subject: Re: [RFC v3][PATCH 2/2] intel_txt: Intel(R) TXT and tboot kernel support

> > > > +   ((void(*)(void))(long)tboot_shared->shutdown_entry)();
> 
> be better? Or is shutdown_entry always mapped into [0..2GB) on 

0..4GB and this code runs in a identity mapping.

> 64-bit? Even then, not sign-extending RIP addresses is wrong and 
> invites bugs/restrictions.

You never have to sign extend when going from 32bit to 64bit
on x86-64.

-andi

-- 
ak@...ux.intel.com -- Speaking for myself only.
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