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

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Date:	Wed, 10 Dec 2014 16:46:52 +0800
From:	Baoquan He <bhe@...hat.com>
To:	Joerg Roedel <joro@...tes.org>
Cc:	"Li, ZhenHua" <zhen-hual@...com>,
	Takao Indoh <indou.takao@...fujitsu.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

Hi Joerg, ZhenHua,

This issue happens on AMD iommu too, do you have any plans or
thoughts on that?

Thanks
Baoquan

On 11/17/14 at 02:38pm, 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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