linux-kernel - Re: [PATCH v2] x86: Return to kernel without IRET

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Message-ID: <20140503072428.54f89688@gandalf.local.home>
Date:	Sat, 3 May 2014 07:24:28 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	x86@...nel.org, Gleb Natapov <gleb@...nel.org>,
	Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH v2] x86: Return to kernel without IRET

On Fri, 02 May 2014 21:03:10 -0700
"H. Peter Anvin" <hpa@...or.com> wrote:

> 
> I'd really like to see a workload which would genuinely benefit before
> adding more complexity.  Now... if we can determine that it doesn't harm
> anything and would solve the NMI nesting problem cleaner than the
> current solution, that would justify things, too...
> 

As I stated before. It doesn't solve the NMI nesting problem. It only
handles page faults. We would have to implement this for breakpoint
return paths too. Is that a plan as well?

-- Steve
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