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

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Date:   Fri, 28 Jul 2017 13:18:09 +0200
From:   Joerg Roedel <jroedel@...e.de>
To:     Baoquan He <bhe@...hat.com>
Cc:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 10/13] iommu/amd: Allocate memory below 4G for dev
 table if translation pre-enabled

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.