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

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Date:	Mon, 01 Dec 2014 14:31:38 +0800
From:	"Li, ZhenHua" <zhen-hual@...com>
To:	Joerg Roedel <joro@...tes.org>
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

Joerg,

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.


Thanks
Zhenhua

On 11/17/2014 09:38 PM, Joerg Roedel wrote:
> On Fri, Nov 14, 2014 at 02:27:44PM +0800, Li, ZhenHua wrote:
>> I am working following  your directions:
>>
>> 1.  If the VT-d driver finds the IOMMU enabled, it reuses its root entry
>> table, and do NOT disable-enable iommu. Other data will be copied.
>>
>> 2. When a device driver issues the first dma_map command for a
>> device, we assign a new and empty page-table, thus removing all
>> mappings from the old kernel for the device.
>>
>> Please let me know if I get something wrong.
>
> Yes, this sounds right. Happily waiting for patches :)
>
>
> 	Joerg
>

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