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Subject: Re: [PATCH v6 0/6] mm: introduce memfd_secret system call to create
 "secret" memory areas
From:   David Hildenbrand <david@redhat.com>
To:     Mike Rapoport <rppt@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>
Cc:     Alexander Viro <viro@zeniv.linux.org.uk>,
        Andy Lutomirski <luto@kernel.org>,
        Arnd Bergmann <arnd@arndb.de>, Borislav Petkov <bp@alien8.de>,
        Catalin Marinas <catalin.marinas@arm.com>,
        Christopher Lameter <cl@linux.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Dave Hansen <dave.hansen@linux.intel.com>,
        Elena Reshetova <elena.reshetova@intel.com>,
        "H. Peter Anvin" <hpa@zytor.com>, Idan Yaniv <idan.yaniv@ibm.com>,
        Ingo Molnar <mingo@redhat.com>,
        James Bottomley <jejb@linux.ibm.com>,
        "Kirill A. Shutemov" <kirill@shutemov.name>,
        Matthew Wilcox <willy@infradead.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        Michael Kerrisk <mtk.manpages@gmail.com>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Paul Walmsley <paul.walmsley@sifive.com>,
        Peter Zijlstra <peterz@infradead.org>,
        Thomas Gleixner <tglx@linutronix.de>,
        Shuah Khan <shuah@kernel.org>, Tycho Andersen <tycho@tycho.ws>,
        Will Deacon <will@kernel.org>, linux-api@vger.kernel.org,
        linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-fsdevel@vger.kernel.org, linux-mm@kvack.org,
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        linux-nvdimm@lists.01.org, linux-riscv@lists.infradead.org,
        x86@kernel.org
References: <20200924132904.1391-1-rppt@kernel.org>
 <9c38ac3b-c677-6a87-ce82-ec53b69eaf71@redhat.com>
Organization: Red Hat GmbH
Message-ID: <0f095c22-4a3a-3213-a853-c1c859c357e2@redhat.com>
Date:   Mon, 2 Nov 2020 10:31:09 +0100
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On 02.11.20 10:11, David Hildenbrand wrote:
> On 24.09.20 15:28, Mike Rapoport wrote:
>> From: Mike Rapoport <rppt@linux.ibm.com>
>>
>> Hi,
>>
>> This is an implementation of "secret" mappings backed by a file descriptor.
>> I've dropped the boot time reservation patch for now as it is not strictly
>> required for the basic usage and can be easily added later either with or
>> without CMA.
> 
> Hi Mike,
> 
> I'd like to stress again that I'd prefer *any* secretmem allocations
> going via CMA as long as these pages are unmovable. The user can
> allocate a non-significant amount of unmovable allocations only fenced

lol, "non-neglectable" or "significant". Guess I need another coffee :)


-- 
Thanks,

David / dhildenb