From mboxrd@z Thu Jan  1 00:00:00 1970
From: Christopher Lameter <cl@linux.com>
Subject: Re: [PATCH RFC] mm: add MAP_EXCLUSIVE to create exclusive user
 mappings
Date: Wed, 30 Oct 2019 12:09:23 +0000 (UTC)
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To: Mike Rapoport <rppt@kernel.org>
Cc: "Kirill A. Shutemov" <kirill@shutemov.name>, linux-kernel@vger.kernel.org, Alexey Dobriyan <adobriyan@gmail.com>, Andrew Morton <akpm@linux-foundation.org>, Andy Lutomirski <luto@kernel.org>, Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>, Dave Hansen <dave.hansen@linux.intel.com>, James Bottomley <jejb@linux.ibm.com>, Peter Zijlstra <peterz@infradead.org>, Steven Rostedt <rostedt@goodmis.org>, Thomas Gleixner <tglx@linutronix.de>, Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>, linux-api@vger.kernel.org, linux-mm@kvack.org, x86@kernel.org, Mike Rapoport <rppt@linux.ibm.com>
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On Wed, 30 Oct 2019, Mike Rapoport wrote:

> > /dev/securemem or so?
>
> A device driver will need to remove the secure area from the direct map and
> then we back to square one.

We have avoided the need for modifications to kernel core code. And its a
natural thing to treat this like special memory provided by a device
driver.