linux-kernel - Re: [PATCH] i386: improve double fault handling

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Message-ID: <488DCD70.4020003@zytor.com>
Date:	Mon, 28 Jul 2008 09:45:20 -0400
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Jan Beulich <jbeulich@...ell.com>,
	Andi Kleen <andi@...stfloor.org>, tglx@...utronix.de,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Joerg Roedel <joro@...tes.org>
Subject: Re: [PATCH] i386: improve double fault handling

Ingo Molnar wrote:
> 
> Secondly, task gates are really a relic that should not be proliferated. 
> Besides the complications in virtualized environments (if more common 
> things like Big Real Mode are not supported well in virtual mode what do 
> we expect of more esoteric features as task gates?) it does not get 
> nearly as much testing on real silicon as other, more mainstream CPU 
> features.
> 

I think that using it as a bailout mechanism is going to remain 
supported and tested.  It's just never going to be fast.

	-hpa

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