Re: [PATCH v8 10/13] iommu/amd: Allocate memory below 4G for dev table if translation pre-enabled

[Joerg Roedel]

On Fri, Jul 28, 2017 at 07:15:53PM +0800, Baoquan He wrote:
> On 07/28/17 at 01:14pm, Joerg Roedel wrote:
> > Yes, exactly, the first device table also needs to be allocated with
> > GFP_DMA32 so that it ends up below 4GB.
> 
> Got it, will do. Thanks!

Oh, and you also need to check in the kdump kernel whether the old
device-table is really below 4GB and abort the copy otherwise.