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 13:14:39 +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 05:06:19PM +0800, Baoquan He wrote:
> Do you mean the allocation of amd_iommu_dev_table in
> early_amd_iommu_init() also need be addressed for 1st kernel? Seems we
> don't make sure that for 1st kernel, like adding GFP_DMA32 flag when
> allocate amd_iommu_dev_table in amd_iommu_dev_table
> early_amd_iommu_init().

Yes, exactly, the first device table also needs to be allocated with
GFP_DMA32 so that it ends up below 4GB.