linux-kernel - Re: [HMM v14 05/16] mm/ZONE_DEVICE/unaddressable: add support for un-addressable device memory

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Message-ID: <be2861b4-d830-fbd7-e9eb-ebc8e4d913a2@intel.com>
Date:   Thu, 8 Dec 2016 08:21:28 -0800
From:   Dave Hansen <dave.hansen@...el.com>
To:     Jérôme Glisse <jglisse@...hat.com>,
        akpm@...ux-foundation.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Cc:     John Hubbard <jhubbard@...dia.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>
Subject: Re: [HMM v14 05/16] mm/ZONE_DEVICE/unaddressable: add support for
 un-addressable device memory

On 12/08/2016 08:39 AM, Jérôme Glisse wrote:
> Architecture that wish to support un-addressable device memory should make
> sure to never populate the kernel linar mapping for the physical range.

Does the platform somehow provide a range of physical addresses for this
unaddressable area?  How do we know no memory will be hot-added in a
range we're using for unaddressable device memory, for instance?