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

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Message-ID: <5356A5EB.6010702@zytor.com>
Date:	Tue, 22 Apr 2014 10:24:59 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Andrew Lutomirski <amluto@...il.com>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Borislav Petkov <bp@...en8.de>,
	"H. Peter Anvin" <hpa@...ux.intel.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	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*

On 04/22/2014 10:20 AM, Andrew Lutomirski wrote:
> 
> It won't, given the above.  I misunderstood what you were checking.
> 
> It still seems to me that only #GP needs this special handling.  The
> IST entries should never run on the espfix stack, and #MC, #DB, #NM,
> and #SS (I missed that one earlier) use IST.
> 
> Would it ever make sense to make #GP use IST as well?  That might
> allow espfix_adjust_stack to be removed entirely.  I don't know how
> much other fiddling would be needed to make that work.
> 

Interesting thought.  It might even be able to share an IST entry with #SS.

	-hpa


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