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 _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu
