linux-ext4 - Re: [PATCH v1 03/14] mm: add iomem vma selection for memory migration

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Date:   Wed, 25 Aug 2021 09:46:02 +0200
From:   Christoph Hellwig <hch@....de>
To:     Alex Sierra <alex.sierra@....com>
Cc:     akpm@...ux-foundation.org, Felix.Kuehling@....com,
        linux-mm@...ck.org, rcampbell@...dia.com,
        linux-ext4@...r.kernel.org, linux-xfs@...r.kernel.org,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        hch@....de, jgg@...dia.com, jglisse@...hat.com
Subject: Re: [PATCH v1 03/14] mm: add iomem vma selection for memory
 migration

On Tue, Aug 24, 2021 at 10:48:17PM -0500, Alex Sierra wrote:
>  		} else {
> -			if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM))
> +			if (!(migrate->flags & MIGRATE_VMA_SELECT_SYSTEM) &&
> +			    !(migrate->flags & MIGRATE_VMA_SELECT_IOMEM))
>  				goto next;
>  			pfn = pte_pfn(pte);
>  			if (is_zero_pfn(pfn)) {

.. also how is this going to work for the device public memory?  That
should be pte_special() an thus fail vm_normal_page.