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

From: Joerg Roedel
Date: Mon Nov 17 2014 - 08:39:07 EST

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 :)


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