linux-kernel - Re: DMAR error messages after 'shutdown -r'.

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Message-ID: <20160216164745.GZ18805@8bytes.org>
Date:	Tue, 16 Feb 2016 17:47:45 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Valdis Kletnieks <Valdis.Kletnieks@...edu>
Cc:	iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: DMAR error messages after 'shutdown -r'.

On Tue, Feb 09, 2016 at 02:59:00PM -0500, Valdis Kletnieks wrote:
> [    0.027629] Freeing SMP alternatives memory: 28K (ffffffff8e111000 - ffffffff8e118000)
> [    0.048199] ftrace: allocating 31090 entries in 122 pages
> [    0.061837] DMAR: Host address width 36
> [    0.061841] DMAR: DRHD base: 0x000000fed90000 flags: 0x1
> [    0.061894] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap c9008020660262 ecap f0105a
> [    0.061896] DMAR: RMRR base: 0x000000cdb11000 end: 0x000000cdb30fff
> [    0.061899] DMAR-IR: IOAPIC id 2 under DRHD base  0xfed90000 IOMMU 0
> [    0.061901] DMAR-IR: HPET id 0 under DRHD base 0xfed90000
> [    0.061903] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping.
> ---- Error here....
> [    0.062027] DMAR: DRHD: handling fault status reg 2
> [    0.062034] DMAR: DMAR:[DMA Read] Request device [00:1f.2] fault addr cdacd000
>                DMAR:[fault reason 06] PTE Read access is not set
> ----

This is probably from a missing RMRR entry for device 00:1f.2. Can you
please post full dmesg after boot?

Thanks,

	Joerg