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Date:   Tue, 17 Aug 2021 07:49:00 +0200
From:   Christoph Hellwig <>
To:     "Sierra Guiza, Alejandro (Alex)" <>
Cc:     Christoph Hellwig <>,,,,,,,,,,
Subject: Re: [PATCH v6 05/13] drm/amdkfd: generic type as sys mem on
 migration to ram

On Mon, Aug 16, 2021 at 02:53:18PM -0500, Sierra Guiza, Alejandro (Alex) wrote:
> For above’s condition equal to connected_to_cpu , we’re explicitly 
> migrating from
> device memory to system memory with device generic type. In this type, 
> device PTEs are
> present in CPU page table.
> During migrate_vma_collect_pmd walk op at migrate_vma_setup call, there’s 
> a condition
> for present pte that require migrate->flags be set for 
> Otherwise, the migration for this entry will be ignored.

I think we might need a new SELECT flag here for IOMEM.

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