linux-kernel - Re: [PATCH v5 0/5] mm: introduce memfd_secret system call to create "secret" memory areas

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Message-ID: <20200917060204.GO2142832@kernel.org>
Date:   Thu, 17 Sep 2020 09:02:04 +0300
From:   Mike Rapoport <rppt@...nel.org>
To:     "Michael Kerrisk (man-pages)" <mtk.manpages@...il.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christopher Lameter <cl@...ux.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        David Hildenbrand <david@...hat.com>,
        Elena Reshetova <elena.reshetova@...el.com>,
        "H. Peter Anvin" <hpa@...or.com>, Idan Yaniv <idan.yaniv@....com>,
        Ingo Molnar <mingo@...hat.com>,
        James Bottomley <jejb@...ux.ibm.com>,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Mark Rutland <mark.rutland@....com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Tycho Andersen <tycho@...ho.ws>, Will Deacon <will@...nel.org>,
        Linux API <linux-api@...r.kernel.org>,
        linux-arch <linux-arch@...r.kernel.org>,
        linux-arm-kernel@...ts.infradead.org,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        lkml <linux-kernel@...r.kernel.org>, linux-nvdimm@...ts.01.org,
        linux-riscv@...ts.infradead.org,
        "maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)" <x86@...nel.org>
Subject: Re: [PATCH v5 0/5] mm: introduce memfd_secret system call to create
 "secret" memory areas

On Thu, Sep 17, 2020 at 07:46:12AM +0200, Michael Kerrisk (man-pages) wrote:
> On Thu, 17 Sep 2020 at 01:20, Andrew Morton <akpm@...ux-foundation.org> wrote:
> >
> > On Wed, 16 Sep 2020 10:35:34 +0300 Mike Rapoport <rppt@...nel.org> wrote:
> >
> > > 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.
> >
> > It seems early days for this, especially as regards reviewer buyin.
> > But I'll toss it in there to get it some additional testing.
> >
> > A test suite in tools/testging/selftests/ would be helpful, especially
> > for arch maintainers.
> >
> > I assume that user-facing manpage alterations are planned?

> I was just about to write a mail into this thread when I saw this :-).
> 
> So far, I don't think I saw a manual page patch. Mike, how about it?

It is planned :)

I have a draft, but I'm waiting for consensus about the uncached
mappings before sending it out.

-- 
Sincerely yours,
Mike.