linux-kernel - Re: [PATCH 0/5] iommu/vt-d: Fix crash dump failure caused by legacy DMA/IO

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Message-ID: <20141201123327.GJ3762@8bytes.org>
Date:	Mon, 1 Dec 2014 13:33:27 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	"Li, ZhenHua" <zhen-hual@...com>
Cc:	Takao Indoh <indou.takao@...fujitsu.com>, bhe@...hat.com,
	dwmw2@...radead.org, vgoyal@...hat.com, dyoung@...hat.com,
	iommu@...ts.linux-foundation.org, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
	alex.williamson@...hat.com, ddutile@...hat.com,
	ishii.hironobu@...fujitsu.com, bhelgaas@...gle.com,
	doug.hatch@...com, jerry.hoemann@...com, tom.vaden@...com,
	li.zhang6@...com, lisa.mitchell@...com
Subject: Re: [PATCH 0/5] iommu/vt-d: Fix crash dump failure caused by legacy
 DMA/IO

On Mon, Dec 01, 2014 at 02:31:38PM +0800, Li, ZhenHua wrote:
> After I implement these two steps, there comes a new fault:
> 
> [1.594890] dmar: DRHD: handling fault status reg 2
> [1.594894] dmar: INTR-REMAP: Request device [[41:00.0] fault index 4d
> [1.594894] INTR-REMAP:[fault reason 34] Present field in the IRTE entry
> is clear
> 
> It is caused by similar reason, so I will fix it like fixing the DMAR
> faults: Do NOT disable and re-enable the interrupt remapping, try to
> use data from old kernel.

Yes, that sounds right, thanks. Looking forward to your patches.


	Joerg

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