Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP Proliant G6)

From	Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Newsgroups	linux.kernel
Subject	Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP Proliant G6)
Date	2016-07-13 16:00 +0200
Message-ID	<rUsRH-3OH-3@gated-at.bofh.it> (permalink)
References	(3 earlier) <rU6Rd-66R-73@gated-at.bofh.it> <rUmCC-8ei-55@gated-at.bofh.it> <rUnyG-oj-15@gated-at.bofh.it> <rUnIl-rS-9@gated-at.bofh.it> <rUol3-VT-1@gated-at.bofh.it>
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On Wed, 13 Jul 2016, Joerg Roedel wrote:
> On Wed, Jul 13, 2016 at 11:31:02AM +0300, Meelis Roos wrote:
> > > > Bisecting kernel configs shows that it's DMAR+IOMMU. When it is 
> > > > activated, there is high probability of NMI-s in random places.
> > > 
> > > Hmm, strange. But nothing could really surprise when you have an HP
> > > BIOS.
> > 
> > BIOS P64 01/22/2015. There seems to be a newer 2015.08.16 BIOS out but 
> > the release notes only describe updated CPU microcode for security 
> > reasons.
> 
> It is probably something HP is selling as a "feature" and not a BIOS
> bug.

Well, based on the date, it should be the microcode-level fix for this:
https://www.blackhat.com/docs/us-15/materials/us-15-Domas-The-Memory-Sinkhole-Unleashing-An-x86-Design-Flaw-Allowing-Universal-Privilege-Escalation-wp.pdf

-- 
  "One disk to rule them all, One disk to find them. One disk to bring
  them all and in the darkness grind them. In the Land of Redmond
  where the shadows lie." -- The Silicon Valley Tarot
  Henrique Holschuh

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Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 Meelis Roos <mroos@linux.ee> - 2016-07-12 14:30 +0200
  Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2016-07-12 14:40 +0200
    Re: 4.7-rc6: NMI in intel_idle on HP Proliant G6 Meelis Roos <mroos@linux.ee> - 2016-07-13 09:20 +0200
    Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 10:20 +0200
      Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Meelis Roos <mroos@linux.ee> - 2016-07-13 10:30 +0200
        Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 11:10 +0200
          Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Meelis Roos <mroos@linux.ee> - 2016-07-13 11:20 +0200
            Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 11:50 +0200
          Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Meelis Roos <mroos@linux.ee> - 2016-07-13 11:40 +0200
            Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 11:50 +0200
              Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Joerg Roedel <joro@8bytes.org> - 2016-07-13 12:20 +0200
                Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on  HP Proliant G6) Alex Williamson <alex.williamson@redhat.com> - 2016-07-13 17:00 +0200
                Re: IOMMU+DMAR causing NMIs-s Meelis Roos <mroos@linux.ee> - 2016-07-14 00:00 +0200
                Re: IOMMU+DMAR causing NMIs-s Alex Williamson <alex.williamson@redhat.com> - 2016-07-14 01:10 +0200
                Re: IOMMU+DMAR causing NMIs-s Joerg Roedel <joro@8bytes.org> - 2016-07-14 10:40 +0200
          Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP  Proliant G6) Henrique de Moraes Holschuh <hmh@hmh.eng.br> - 2016-07-13 16:00 +0200

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