linux-kernel - Re: [RFC 1/3] x86/vdso: create vdso file, use it for mapping

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Message-ID: <CALCETrWmDFiK0HACo0-dJgtFOijxzr=ApJoTNMDHmb+P=9=_TA@mail.gmail.com>
Date:   Mon, 29 Aug 2016 02:28:08 -0700
From:   Andy Lutomirski <luto@...capital.net>
To:     Dmitry Safonov <dsafonov@...tuozzo.com>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>, X86 ML <x86@...nel.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Al Viro <viro@...iv.linux.org.uk>
Subject: Re: [RFC 1/3] x86/vdso: create vdso file, use it for mapping

On Thu, Aug 25, 2016 at 8:21 AM, Dmitry Safonov <dsafonov@...tuozzo.com> wrote:
> I added here a new in-kernel fs with ramfs-like options.
> Created vdso file in this fs (yet for testing, only 64-bit vdso).
> Mapped this file to process's mm on setup_additional_pages.
> Just for testing purpose it's done only for specific UID.

I'm wondering whether all this code could be easily moved into the
core special mapping helpers so that all special mappings get the same
benefit.  We could embed a struct file * (or struct inode or whatever)
in special_mapping if needed.

Also, could this be simplified to use anon_inode?

(I'm not a VFS expert at all, so I could be way off base.)