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

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Message-ID: <537D21F2.8030702@zytor.com>
Date:	Wed, 21 May 2014 15:00:18 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Borislav Petkov <bp@...en8.de>,
	Andy Lutomirski <luto@...capital.net>
CC:	Linus Torvalds <torvalds@...ux-foundation.org>,
	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>,
	Ingo Molnar <mingo@...nel.org>,
	"Luck, Tony" <tony.luck@...el.com>
Subject: Re: [RFC] x86_64: A real proposal for iret-less return to kernel

On 05/21/2014 02:54 PM, Borislav Petkov wrote:
> On Wed, May 21, 2014 at 02:47:03PM -0700, Andy Lutomirski wrote:
>> Is there anything actually wrong with just panicking if
>> !user_mode_vm(regs)?  That would make this a lot more sane.
> 
> It does that already - mce_severity().
> 

So this is not a problem then.

	-hpa

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