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Date:   Thu, 27 Jan 2022 14:32:58 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Alex Sierra <alex.sierra@amd.com>
Cc:     <Felix.Kuehling@amd.com>, <linux-mm@kvack.org>,
        <rcampbell@nvidia.com>, <linux-ext4@vger.kernel.org>,
        <linux-xfs@vger.kernel.org>, <amd-gfx@lists.freedesktop.org>,
        <dri-devel@lists.freedesktop.org>, <hch@lst.de>, <jgg@nvidia.com>,
        <jglisse@redhat.com>, <apopple@nvidia.com>, <willy@infradead.org>
Subject: Re: [PATCH v4 00/10] Add MEMORY_DEVICE_COHERENT for coherent device
 memory mapping
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On Wed, 26 Jan 2022 21:09:39 -0600 Alex Sierra <alex.sierra@amd.com> wrote:

> This patch series introduces MEMORY_DEVICE_COHERENT, a type of memory
> owned by a device that can be mapped into CPU page tables like
> MEMORY_DEVICE_GENERIC and can also be migrated like
> MEMORY_DEVICE_PRIVATE.

Some more reviewer input appears to be desirable here.

I was going to tentatively add it to -mm and -next, but problems. 
5.17-rc1's mm/migrate.c:migrate_vma_check_page() is rather different
from the tree you patched.  Please redo, refresh and resend?