Re: [PATCH 3/3] /dev/mem: Do not map unaccepted memory

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To: David Hildenbrand <david@xxxxxxxxxx>, "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Subject: Re: [PATCH 3/3] /dev/mem: Do not map unaccepted memory
From: Dave Hansen <dave.hansen@xxxxxxxxx>
Date: Mon, 11 Sep 2023 07:32:46 -0700
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>, Borislav Petkov <bp@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Mike Rapoport <rppt@xxxxxxxxxxxxx>, Lorenzo Stoakes <lstoakes@xxxxxxxxx>, Tom Lendacky <thomas.lendacky@xxxxxxx>, Baoquan He <bhe@xxxxxxxxxx>, Vivek Goyal <vgoyal@xxxxxxxxxx>, Dave Young <dyoung@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, linux-coco@xxxxxxxxxxxxxxx, linux-efi@xxxxxxxxxxxxxxx, kexec@xxxxxxxxxxxxxxxxxxx
In-reply-to: <c60df0e4-4214-bbd0-7fc6-8f04e5888f53@redhat.com>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.15.0

On 9/11/23 01:09, David Hildenbrand wrote:
> So, making unaccepted memory similarly depend on "!DEVMEM ||
> STRICT_DEVMEM" does not sound too far off ...

Yeah, considering all of the invasive work folks want to do to "harden"
the kernel for TDX, doing that ^ is just about the best
bang-for-your-buck "hardening" that you can get.

References:
- [PATCH 0/3] Do not map unaccepted memory
  - From: Adrian Hunter
- [PATCH 3/3] /dev/mem: Do not map unaccepted memory
  - From: Adrian Hunter
- Re: [PATCH 3/3] /dev/mem: Do not map unaccepted memory
  - From: Dave Hansen
- Re: [PATCH 3/3] /dev/mem: Do not map unaccepted memory
  - From: Kirill A. Shutemov
- Re: [PATCH 3/3] /dev/mem: Do not map unaccepted memory
  - From: Dave Hansen
- Re: [PATCH 3/3] /dev/mem: Do not map unaccepted memory
  - From: David Hildenbrand

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