linux-kernel - Re: [RFC][PATCH 3/3] TXT: Intel(R) TXT and tboot kernel support

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Message-ID: <20081009213433.GG6912@sequoia.sous-sol.org>
Date:	Thu, 9 Oct 2008 14:34:33 -0700
From:	Chris Wright <chrisw@...s-sol.org>
To:	"Cihula, Joseph" <joseph.cihula@...el.com>
Cc:	Chris Wright <chrisw@...s-sol.org>, Pavel Machek <pavel@...e.cz>,
	linux-kernel@...r.kernel.org, "Wang, Shane" <shane.wang@...el.com>,
	"Wei, Gang" <gang.wei@...el.com>,
	"Van De Ven, Arjan" <arjan.van.de.ven@...el.com>,
	"Mallick, Asit K" <asit.k.mallick@...el.com>,
	"Nakajima, Jun" <jun.nakajima@...el.com>,
	Chris Wright <chrisw@...hat.com>,
	Jan Beulich <jbeulich@...ell.com>, mingo@...e.hu, tytso@....edu
Subject: Re: [RFC][PATCH 3/3] TXT: Intel(R) TXT and tboot kernel support

* Cihula, Joseph (joseph.cihula@...el.com) wrote:
> > From: Chris Wright [mailto:chrisw@...s-sol.org]
> > I asked earlier, I didn't understand why it needs to be 2 fields, since
> > it's u32 in both cases and can't both be used at once.
> 
> We will look at seeing if we can make a single entry point that detects
> if it was called by 64b code, disable IA32e mode, and then jumps to the
> 32b code.

Yeah, that's exactly what I was thinking.  I assumed I missed a piece...

>   We did it this way initially because it was easier code to
> keep them separate and has been working for some time.  We'll also have
> to adjust Xen if/when we do this.

...which is just this ease of implementation, thanks.

thanks,
-chris
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