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Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak

From "H. Peter Anvin" <hpa@zytor.com>
Newsgroups linux.kernel
Subject Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak
Date 2016-06-14 23:00 +0200
Message-ID <rK3Bf-1rf-1@gated-at.bofh.it> (permalink)
References (3 earlier) <rK1pN-88-59@gated-at.bofh.it> <rK1J7-fP-23@gated-at.bofh.it> <rK22u-BW-11@gated-at.bofh.it> <rK38d-1hi-29@gated-at.bofh.it> <rK3rA-1nX-39@gated-at.bofh.it>
Organization linux.* mail to news gateway

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On 06/14/16 13:47, Borislav Petkov wrote:
> On Tue, Jun 14, 2016 at 01:20:06PM -0700, H. Peter Anvin wrote:
>> static_cpu_has_bug() should turn into 5-byte NOP in the common (bugless)
>> case.
> 
> Yeah, it does. I looked at the asm.
> 
> I wasn't 100% sure because I vaguely remember gcc reordering things in
> some pathological case but I'm most likely remembering wrong because if
> it were doing that, then the whole nopping out won't work. F'get about
> it. :)
> 

There was that.  It is still possible that we end up with NOP a JMP
right before another JMP; we could perhaps make the patching code
smarter and see if we have a JMP immediately after.

	-hpa

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Thread

[PATCH] Linux VM workaround for Knights Landing A/D leak Lukasz Anaczkowski <lukasz.anaczkowski@intel.com> - 2016-06-14 18:00 +0200
  Re: [PATCH] Linux VM workaround for Knights Landing A/D leak kbuild test robot <lkp@intel.com> - 2016-06-14 18:40 +0200
  Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-14 18:50 +0200
    RE: [PATCH] Linux VM workaround for Knights Landing A/D leak "Anaczkowski, Lukasz" <lukasz.anaczkowski@intel.com> - 2016-06-14 19:00 +0200
    [PATCH v2] Linux VM workaround for Knights Landing A/D leak Lukasz Anaczkowski <lukasz.anaczkowski@intel.com> - 2016-06-14 19:10 +0200
      Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Dave Hansen <dave.hansen@linux.intel.com> - 2016-06-14 19:30 +0200
        Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk> - 2016-06-14 20:40 +0200
          Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Dave Hansen <dave.hansen@linux.intel.com> - 2016-06-14 21:00 +0200
            Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Borislav Petkov <bp@alien8.de> - 2016-06-14 21:20 +0200
              Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak "H. Peter Anvin" <hpa@zytor.com> - 2016-06-14 22:30 +0200
                Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Borislav Petkov <bp@alien8.de> - 2016-06-14 22:50 +0200
                Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak "H. Peter Anvin" <hpa@zytor.com> - 2016-06-14 23:00 +0200
                Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak "H. Peter Anvin" <hpa@zytor.com> - 2016-06-14 23:10 +0200
                Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Borislav Petkov <bp@alien8.de> - 2016-06-14 23:10 +0200
                Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak "H. Peter Anvin" <hpa@zytor.com> - 2016-06-14 23:20 +0200
      Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Borislav Petkov <bp@alien8.de> - 2016-06-14 20:20 +0200
        RE: [PATCH v2] Linux VM workaround for Knights Landing A/D leak "Anaczkowski, Lukasz" <lukasz.anaczkowski@intel.com> - 2016-06-15 15:20 +0200
      Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-14 20:40 +0200
        RE: [PATCH v2] Linux VM workaround for Knights Landing A/D leak "Anaczkowski, Lukasz" <lukasz.anaczkowski@intel.com> - 2016-06-15 15:20 +0200
          Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-15 22:10 +0200
            Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Dave Hansen <dave.hansen@linux.intel.com> - 2016-06-15 22:20 +0200
              Re: [PATCH v2] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-15 22:30 +0200
      [PATCH v3] Linux VM workaround for Knights Landing A/D leak Lukasz Anaczkowski <lukasz.anaczkowski@intel.com> - 2016-06-16 17:20 +0200
        Re: [PATCH v3] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-16 18:50 +0200
        Re: [PATCH v3] Linux VM workaround for Knights Landing A/D leak Dave Hansen <dave.hansen@linux.intel.com> - 2016-06-16 22:30 +0200
    Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Dave Hansen <dave.hansen@linux.intel.com> - 2016-06-14 19:20 +0200
      Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-14 22:20 +0200
        Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Dave Hansen <dave.hansen@linux.intel.com> - 2016-06-14 23:40 +0200
          Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Andy Lutomirski <luto@amacapital.net> - 2016-06-15 04:30 +0200
            Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-15 04:40 +0200
              Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Andy Lutomirski <luto@amacapital.net> - 2016-06-15 04:40 +0200
                Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-15 04:50 +0200
                Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Andy Lutomirski <luto@amacapital.net> - 2016-06-15 05:10 +0200
          Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Nadav Amit <nadav.amit@gmail.com> - 2016-06-15 05:30 +0200
  Re: [PATCH] Linux VM workaround for Knights Landing A/D leak kbuild test robot <lkp@intel.com> - 2016-06-14 19:00 +0200
  Re: [PATCH] Linux VM workaround for Knights Landing A/D leak Dave Hansen <dave.hansen@linux.intel.com> - 2016-06-14 19:30 +0200
    RE: [PATCH] Linux VM workaround for Knights Landing A/D leak "Anaczkowski, Lukasz" <lukasz.anaczkowski@intel.com> - 2016-06-15 15:10 +0200

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