Re: [PATCH v8 02/10] iommu/vt-d: Items required for kdump

[Joerg Roedel]

On Mon, Jan 12, 2015 at 10:29:19AM -0500, Vivek Goyal wrote:
> Kdump has the notion of backup region. Where certain parts of old kernels
> memory can be moved to a different location (first 640K on x86 as of now)
> and new kernel can make use of this memory now.
> 
> So we will have to just make sure that no parts of this old page table
> fall into backup region.

Uuh, looks like the 'iommu-with-kdump-issue' isn't complicated enough
yet ;)
Sadly, your above statement is true for all hardware-accessible data
structures in IOMMU code. I think about how we can solve this, is there
an easy way to allocate memory that is not in any backup region?

Thanks,

	Joerg

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