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

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Message-ID: <alpine.LRH.2.00.1405211450410.27739@twin.jikos.cz>
Date:	Wed, 21 May 2014 14:51:45 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Andy Lutomirski <luto@...capital.net>
cc:	Steven Rostedt <rostedt@...dmis.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Borislav Petkov <bp@...en8.de>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [RFC] x86_64: A real proposal for iret-less return to kernel

On Tue, 20 May 2014, Andy Lutomirski wrote:

> So the issue here is that we can have an NMI followed immediately by
> an MCE.  The MCE code can call force_sig

This is interesting by itself. force_sig() takes siglock spinlock. This 
really looks like a deadlock sitting there waiting to happen.

-- 
Jiri Kosina
SUSE Labs

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