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Message-ID: <20090512095528.GG19296@one.firstfloor.org>
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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