linux-kernel - Re: [PATCH] userfaultfd: register syscall numbers for x86 32bit and x86-64 64bit

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Message-ID: <20150731091351.GC2272@work-vm>
Date:	Fri, 31 Jul 2015 10:13:52 +0100
From:	"Dr. David Alan Gilbert" <dgilbert@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	"\\\"H. Peter Anvin\\\"" <hpa@...or.com>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-next@...r.kernel.org, linux-api@...r.kernel.org,
	linux-kernel@...r.kernel.org, Andy Lutomirski <luto@...nel.org>,
	Eric B Munson <emunson@...mai.com>,
	Pavel Emelyanov <xemul@...allels.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [PATCH] userfaultfd: register syscall numbers for x86 32bit and
 x86-64 64bit

* Ingo Molnar (mingo@...nel.org) wrote:
> 
> * Andrea Arcangeli <aarcange@...hat.com> wrote:
> 
> > This registers the official numbers of the userfaultfd syscall for x86
> > 32bit and x86-64 64bit. This registration allows to ship kernels in
> > production using these two syscall numbers for userfaultfd.
> > 
> > Acked-by: Pavel Emelyanov <xemul@...allels.com>
> > Signed-off-by: Andrea Arcangeli <aarcange@...hat.com>
> > ---
> >  arch/x86/entry/syscalls/syscall_32.tbl | 1 +
> >  arch/x86/entry/syscalls/syscall_64.tbl | 1 +
> >  include/linux/syscalls.h               | 1 +
> >  kernel/sys_ni.c                        | 1 +
> >  4 files changed, 4 insertions(+)
> 
> Hm, is there consensus on the upstream desirability of this sytem call?

I hope so:
   a) It's generic enough that there's interest in using it in
      a range of projects - there's nothing QEMU specific in it.
   b) It's worked very well on the QEMU code that I wrote that uses it
      for postcopy, and has been solid doing that for many months now.
   c) I'm not aware of any suggestions for a different, generic solution
      to solve the same set of problems.
   d) It's got a good self test, that's survived heavy testing.
   e) I think Andrea has addressed all previous comments on it.

Dave

> 
> Thanks,
> 
> 	Ingo
--
Dr. David Alan Gilbert / dgilbert@...hat.com / Manchester, UK
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