linux-kernel - Re: Dealing with the NMI mess

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Message-ID: <55BB4D5A.7070202@redhat.com>
Date:	Fri, 31 Jul 2015 12:26:34 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Borislav Petkov <bp@...en8.de>
Cc:	Andy Lutomirski <luto@...capital.net>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Willy Tarreau <w@....eu>, Steven Rostedt <rostedt@...dmis.org>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: Dealing with the NMI mess



On 31/07/2015 12:25, Borislav Petkov wrote:
>> > The reason why it isn't documented is probably hidden within Intel.
>> > Besides ICEBP, which is a bit fringe, there's no reason not to document
>> > SALC which Thomas mentioned.  SALC all has been there since the 8086,
>> > and has been undocumented for thirty-odd years.
> That one is invalid (on an IVB):
> 
> [ 1306.231408] traps: icebp[3783] trap invalid opcode ip:4004b0 sp:7fffffffe610 error:0 in icebp[400000+1000]
> 
> AMD APM documents it as invalid too.

It's valid in 32-bit.

Paolo
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