linux-kernel - Re: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from userspace

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Message-ID: <FA327E3E-10C2-4CAE-A750-812BE6CF74FB@intel.com>
Date:	Fri, 14 Nov 2014 01:20:43 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Andy Lutomirski <luto@...capital.net>
CC:	Oleg Nesterov <oleg@...hat.com>, Borislav Petkov <bp@...en8.de>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Andi Kleen" <andi@...stfloor.org>
Subject: Re: [RFC PATCH] x86, entry: Switch stacks on a paranoid entry from
 userspace

"worst ==
MCE_AR_SEVERITY but regs->cs == 0 (i.e. in kernel)"

This can't happen. We can only declare AR severity for a user mode fault.

Sent from my iPhone

> On Nov 13, 2014, at 16:50, Andy Lutomirski <luto@...capital.net> wrote:
> 
> worst ==
> MCE_AR_SEVERITY but regs->cs == 0 (i.e. in kernel)
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