linux-kernel - RE: [RFC] x86_64: A real proposal for iret-less return to kernel

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Date:	Wed, 21 May 2014 23:40:02 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	Andy Lutomirski <luto@...capital.net>,
	Borislav Petkov <bp@...en8.de>, Jiri Kosina <jkosina@...e.cz>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Steven Rostedt" <rostedt@...dmis.org>,
	Andi Kleen <andi@...stfloor.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>
Subject: RE: [RFC] x86_64: A real proposal for iret-less return to kernel

> MCE is frankly misdesigned. It's a piece of shit, and any of the
> hardware designers that claim that what they do is for system
> stability are out to lunch. This is a prime example of what *NOT* to
> do, and how you can actually spread what was potentially a localized
> and recoverable error, and make it global and unrecoverable.

Latest SDM (version 050 from late February this year) describes how
this is going to be fixed. Recoverable machine checks are going to be
thread local. But current silicon still has the broadcast behavior ...
silicon development pipeline is very long :-(

-Tony