linux-kernel - Re: IOMMU+DMAR causing NMIs-s (was: 4.7-rc6: NMI in intel

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

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