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

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Message-ID: <40a363b1-80be-89ce-6527-ac2a4c04917f@intel.com>
Date:   Mon, 11 Sep 2023 07:32:46 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     David Hildenbrand <david@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Borislav Petkov <bp@...en8.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Lorenzo Stoakes <lstoakes@...il.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Baoquan He <bhe@...hat.com>, Vivek Goyal <vgoyal@...hat.com>,
        Dave Young <dyoung@...hat.com>, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-coco@...ts.linux.dev, linux-efi@...r.kernel.org,
        kexec@...ts.infradead.org
Subject: Re: [PATCH 3/3] /dev/mem: Do not map unaccepted memory

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.