Groups > linux.kernel > #1191690

Re: Dealing with the NMI mess

From	Peter Zijlstra <peterz@infradead.org>
Newsgroups	linux.kernel
Subject	Re: Dealing with the NMI mess
Date	2015-07-24 12:30 +0200
Message-ID	<pPIoP-2Zr-33@gated-at.bofh.it> (permalink)
References	(2 earlier) <pPwdY-21o-3@gated-at.bofh.it> <pPwnF-2cG-39@gated-at.bofh.it> <pPwxk-2oa-27@gated-at.bofh.it> <pPwH1-2zU-25@gated-at.bofh.it> <pPwQG-30s-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Thu, Jul 23, 2015 at 02:59:46PM -0700, Andy Lutomirski 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*.

Doesn't !IF already imply that it must be kernel space? AFAIK user space
cannot clear IF.
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Thread

Re: Dealing with the NMI mess Peter Zijlstra <peterz@infradead.org> - 2015-07-23 23:30 +0200
  Re: Dealing with the NMI mess Linus Torvalds <torvalds@linux-foundation.org> - 2015-07-23 23:40 +0200
    Re: Dealing with the NMI mess Andy Lutomirski <luto@amacapital.net> - 2015-07-23 23:50 +0200
      Re: Dealing with the NMI mess Linus Torvalds <torvalds@linux-foundation.org> - 2015-07-24 00:00 +0200
        Re: Dealing with the NMI mess Andy Lutomirski <luto@amacapital.net> - 2015-07-24 00:10 +0200
          Re: Dealing with the NMI mess Linus Torvalds <torvalds@linux-foundation.org> - 2015-07-24 00:10 +0200
          Re: Dealing with the NMI mess Peter Zijlstra <peterz@infradead.org> - 2015-07-24 12:30 +0200
        Re: Dealing with the NMI mess Peter Zijlstra <peterz@infradead.org> - 2015-07-24 13:10 +0200

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