linux-kernel - Re: Dealing with the NMI mess

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Message-ID: <CA+55aFxo1WG0wTu0=VHoysQD+9dMi9g+HZs-yM1NEqkYdsOdtA@mail.gmail.com>
Date:	Thu, 23 Jul 2015 15:03:13 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Peter Zijlstra <peterz@...radead.org>, X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Willy Tarreau <w@....eu>, Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	Brian Gerst <brgerst@...il.com>
Subject: Re: Dealing with the NMI mess

On Thu, Jul 23, 2015 at 2:59 PM, Andy Lutomirski <luto@...capital.net> wrote:
> OK, new proposal:
>
> In do_debug, if we trip an instruction breakpoint while
> !user_mode(regs) && ((regs->flags & X86_EFLAGS_IF) == 0), then disarm
> *that breakpoint*.

Ack.  The more targeted we can make this while still guaranteeing
forward progress, the better. So that sounds really good.

              Linus
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