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Date: Wed, 13 Jul 2016 10:18:17 +0200
From: Joerg Roedel <joro@8bytes.org>
To: Meelis Roos <mroos@linux.ee>
Cc: iommu@lists.linux-foundation.org,
        Linux Kernel list <linux-kernel@vger.kernel.org>,
        David Woodhouse <dwmw2@infradead.org>
Subject: Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel_idle on HP
 Proliant G6)
Message-ID: <20160713081817.GJ12639@8bytes.org>
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On Wed, Jul 13, 2016 at 10:17:59AM +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.

Can you probably use the faulty config and bisect this down to a
specific commit? In v4.7-rc1 some changes to the iova-allocation code
got merged, but I have no idea how those could cause NMIs.


Thanks,

	Joerg