linux-kernel - Re: [PATCH] x86-64: espfix for 64-bit mode *PROTOTYPE*

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Message-ID: <535714A1.9080502@linux.intel.com>
Date:	Tue, 22 Apr 2014 18:17:21 -0700
From:	"H. Peter Anvin" <hpa@...ux.intel.com>
To:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
CC:	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Andy Lutomirski <amluto@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Borislav Petkov <bp@...en8.de>,
	Arjan van de Ven <arjan.van.de.ven@...el.com>,
	Brian Gerst <brgerst@...il.com>,
	Alexandre Julliard <julliard@...ehq.com>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] x86-64: espfix for 64-bit mode *PROTOTYPE*

Another spin of the prototype.  This one avoids the espfix for anything
but #GP, and avoids save/restore/saving registers... one can wonder,
though, how much that actually matters in practice.

It still does redundant SWAPGS on the slow path.  I'm not sure I
personally care enough to optimize that, as it means some fairly
significant restructuring of some of the code paths.  Some of that
restructuring might actually be beneficial, but still...

	-hpa

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