linux-kernel - Re: [RFC] x86: xsave/xrstor support, ucontext

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Message-ID: <20080522081421.GB31727@one.firstfloor.org>
Date:	Thu, 22 May 2008 10:14:21 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Roland McGrath <roland@...hat.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>, Andi Kleen <andi@...stfloor.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mikael Pettersson <mikpe@...uu.se>, mingo@...e.hu,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, drepper@...hat.com,
	Hongjiu.lu@...el.com, linux-kernel@...r.kernel.org,
	arjan@...ux.intel.com, rmk+lkml@....linux.org.uk, dan@...ian.org,
	asit.k.mallick@...el.com
Subject: Re: [RFC] x86: xsave/xrstor support, ucontext_t extensions

> AFAIK the only reason we control the MXCSR value is because we don't
> want to handle a #GP in context switch.  

x86-64 actually handles it in context switch, just i386 doesn't.

-Andi
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