From: Dave Hansen <dave-gkUM19QKKo4@public.gmane.org>
To: Ingo Molnar <mingo-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>
Cc: Mel Gorman
<mgorman-3eNAlZScCAx27rWaFMvyedHuzzzSOjJt@public.gmane.org>,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
x86-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-arch-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
torvalds-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org,
dave.hansen-VuQAYsv1563Yd54FQh9/CA@public.gmane.org,
arnd-r2nGTMty4D4@public.gmane.org,
hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org,
viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org,
Thomas Gleixner <tglx-hfZtesqFncYOwBW4kG4KsQ@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
Peter Zijlstra
<a.p.zijlstra-/NLkJaSkS4VmR6Xm/wNWPw@public.gmane.org>
Subject: Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls
Date: Mon, 18 Jul 2016 11:02:23 -0700 [thread overview]
Message-ID: <578D19AF.3020204@sr71.net> (raw)
In-Reply-To: <20160709083715.GA29939-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
On 07/09/2016 01:37 AM, Ingo Molnar wrote:
> I.e. this pattern:
>
> ret = pkey_mprotect(NULL, PAGE_SIZE, real_prot, pkey);
>
> ... would validate the pkey and we'd return -EOPNOTSUPP for pkey that is not
> available? This would allow maximum future flexibility as it would not define
> kernel allocated pkeys as a 'range'.
Isn't this multiplexing an otherwise straightforward system call? In
addition to providing pkey assignment to memory, it would also being
used to pass pkey allocation information independently from any use for
memory assignment.
The complexity of the ABI comes from its behavior, not from the raw
number of system calls that are needed to implement it. IOW, this makes
the ABI *more* complicated.
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@sr71.net>
To: Ingo Molnar <mingo@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>,
linux-kernel@vger.kernel.org, x86@kernel.org,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, dave.hansen@linux.intel.com,
arnd@arndb.de, hughd@google.com, viro@zeniv.linux.org.uk,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls
Date: Mon, 18 Jul 2016 11:02:23 -0700 [thread overview]
Message-ID: <578D19AF.3020204@sr71.net> (raw)
Message-ID: <20160718180223.UWCRjEcgpOz87fH4IK_hhZXRaMBagvRGCqRi7E9mP14@z> (raw)
In-Reply-To: <20160709083715.GA29939@gmail.com>
On 07/09/2016 01:37 AM, Ingo Molnar wrote:
> I.e. this pattern:
>
> ret = pkey_mprotect(NULL, PAGE_SIZE, real_prot, pkey);
>
> ... would validate the pkey and we'd return -EOPNOTSUPP for pkey that is not
> available? This would allow maximum future flexibility as it would not define
> kernel allocated pkeys as a 'range'.
Isn't this multiplexing an otherwise straightforward system call? In
addition to providing pkey assignment to memory, it would also being
used to pass pkey allocation information independently from any use for
memory assignment.
The complexity of the ABI comes from its behavior, not from the raw
number of system calls that are needed to implement it. IOW, this makes
the ABI *more* complicated.
WARNING: multiple messages have this Message-ID (diff)
From: Dave Hansen <dave@sr71.net>
To: Ingo Molnar <mingo@kernel.org>
Cc: Mel Gorman <mgorman@techsingularity.net>,
linux-kernel@vger.kernel.org, x86@kernel.org,
linux-api@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, dave.hansen@linux.intel.com,
arnd@arndb.de, hughd@google.com, viro@zeniv.linux.org.uk,
Thomas Gleixner <tglx@linutronix.de>,
"H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <a.p.zijlstra@chello.nl>
Subject: Re: [PATCH 6/9] x86, pkeys: add pkey set/get syscalls
Date: Mon, 18 Jul 2016 11:02:23 -0700 [thread overview]
Message-ID: <578D19AF.3020204@sr71.net> (raw)
In-Reply-To: <20160709083715.GA29939@gmail.com>
On 07/09/2016 01:37 AM, Ingo Molnar wrote:
> I.e. this pattern:
>
> ret = pkey_mprotect(NULL, PAGE_SIZE, real_prot, pkey);
>
> ... would validate the pkey and we'd return -EOPNOTSUPP for pkey that is not
> available? This would allow maximum future flexibility as it would not define
> kernel allocated pkeys as a 'range'.
Isn't this multiplexing an otherwise straightforward system call? In
addition to providing pkey assignment to memory, it would also being
used to pass pkey allocation information independently from any use for
memory assignment.
The complexity of the ABI comes from its behavior, not from the raw
number of system calls that are needed to implement it. IOW, this makes
the ABI *more* complicated.
--
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next prev parent reply other threads:[~2016-07-18 18:02 UTC|newest]
Thread overview: 103+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-07 12:47 [PATCH 0/9] [REVIEW-REQUEST] [v4] System Calls for Memory Protection Keys Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 12:47 ` [PATCH 1/9] x86, pkeys: add fault handling for PF_PK page fault bit Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 14:40 ` Mel Gorman
2016-07-07 14:40 ` Mel Gorman
2016-07-07 15:42 ` Dave Hansen
2016-07-07 15:42 ` Dave Hansen
2016-07-07 12:47 ` [PATCH 2/9] mm: implement new pkey_mprotect() system call Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 14:40 ` Mel Gorman
2016-07-07 14:40 ` Mel Gorman
2016-07-07 16:51 ` Dave Hansen
2016-07-07 16:51 ` Dave Hansen
2016-07-08 10:15 ` Mel Gorman
2016-07-08 10:15 ` Mel Gorman
2016-07-07 12:47 ` [PATCH 3/9] x86, pkeys: make mprotect_key() mask off additional vm_flags Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 12:47 ` [PATCH 4/9] x86: wire up mprotect_key() system call Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 12:47 ` [PATCH 5/9] x86, pkeys: allocation/free syscalls Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 14:40 ` Mel Gorman
2016-07-07 14:40 ` Mel Gorman
2016-07-07 15:38 ` Dave Hansen
2016-07-07 15:38 ` Dave Hansen
2016-07-07 12:47 ` [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 14:45 ` Mel Gorman
2016-07-07 14:45 ` Mel Gorman
2016-07-07 17:33 ` Dave Hansen
2016-07-07 17:33 ` Dave Hansen
2016-07-08 7:18 ` Ingo Molnar
2016-07-08 7:18 ` Ingo Molnar
[not found] ` <20160708071810.GA27457-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-07-08 16:32 ` Dave Hansen
2016-07-08 16:32 ` Dave Hansen
2016-07-08 16:32 ` Dave Hansen
2016-07-09 8:37 ` Ingo Molnar
2016-07-09 8:37 ` Ingo Molnar
2016-07-09 8:37 ` Ingo Molnar
2016-07-11 4:25 ` Andy Lutomirski
2016-07-11 4:25 ` Andy Lutomirski
[not found] ` <CALCETrXJhVz6Za4=oidiM2Vfbb+XdggFBYiVyvOCcia+w064aQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-07-11 7:35 ` Ingo Molnar
2016-07-11 7:35 ` Ingo Molnar
2016-07-11 7:35 ` Ingo Molnar
2016-07-11 14:28 ` Dave Hansen
2016-07-11 14:28 ` Dave Hansen
2016-07-12 7:13 ` Ingo Molnar
2016-07-12 7:13 ` Ingo Molnar
2016-07-12 15:39 ` Dave Hansen
2016-07-12 15:39 ` Dave Hansen
2016-07-11 14:50 ` Andy Lutomirski
2016-07-11 14:50 ` Andy Lutomirski
2016-07-11 14:34 ` Dave Hansen
2016-07-11 14:34 ` Dave Hansen
2016-07-11 14:34 ` Dave Hansen
2016-07-11 14:45 ` Andy Lutomirski
2016-07-11 14:45 ` Andy Lutomirski
2016-07-11 15:48 ` Dave Hansen
2016-07-11 15:48 ` Dave Hansen
2016-07-12 16:32 ` Andy Lutomirski
2016-07-12 16:32 ` Andy Lutomirski
2016-07-12 17:12 ` Dave Hansen
2016-07-12 17:12 ` Dave Hansen
2016-07-12 22:55 ` Andy Lutomirski
2016-07-12 22:55 ` Andy Lutomirski
2016-07-13 7:56 ` Ingo Molnar
2016-07-13 7:56 ` Ingo Molnar
2016-07-13 18:43 ` Andy Lutomirski
2016-07-13 18:43 ` Andy Lutomirski
2016-07-14 8:07 ` Ingo Molnar
2016-07-14 8:07 ` Ingo Molnar
2016-07-18 4:43 ` Andy Lutomirski
2016-07-18 4:43 ` Andy Lutomirski
2016-07-18 9:56 ` Ingo Molnar
2016-07-18 9:56 ` Ingo Molnar
[not found] ` <20160709083715.GA29939-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2016-07-18 18:02 ` Dave Hansen [this message]
2016-07-18 18:02 ` Dave Hansen
2016-07-18 18:02 ` Dave Hansen
2016-07-18 20:12 ` Dave Hansen
2016-07-18 20:12 ` Dave Hansen
2016-07-18 20:12 ` Dave Hansen
2016-07-08 19:26 ` Dave Hansen
2016-07-08 19:26 ` Dave Hansen
[not found] ` <577E924C.6010406-gkUM19QKKo4@public.gmane.org>
2016-07-08 10:22 ` Mel Gorman
2016-07-08 10:22 ` Mel Gorman
2016-07-08 10:22 ` Mel Gorman
2016-07-07 12:47 ` [PATCH 7/9] generic syscalls: wire up memory protection keys syscalls Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 12:47 ` [PATCH 8/9] pkeys: add details of system call use to Documentation/ Dave Hansen
2016-07-07 12:47 ` Dave Hansen
2016-07-07 12:47 ` [PATCH 9/9] x86, pkeys: add self-tests Dave Hansen
2016-07-07 12:47 ` Dave Hansen
[not found] ` <20160707124719.3F04C882-LXbPSdftPKxrdx17CPfAsdBPR1lH4CV8@public.gmane.org>
2016-07-07 14:47 ` [PATCH 0/9] [REVIEW-REQUEST] [v4] System Calls for Memory Protection Keys Mel Gorman
2016-07-07 14:47 ` Mel Gorman
2016-07-07 14:47 ` Mel Gorman
2016-07-08 18:38 ` Hugh Dickins
2016-07-08 18:38 ` Hugh Dickins
2016-07-08 18:38 ` Hugh Dickins
-- strict thread matches above, loose matches on Subject: below --
2016-06-09 0:01 [PATCH 0/9] [v3] " Dave Hansen
2016-06-09 0:01 ` [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen
2016-06-09 0:01 ` Dave Hansen
2016-06-07 20:47 [PATCH 0/9] [v2] System Calls for Memory Protection Keys Dave Hansen
2016-06-07 20:47 ` [PATCH 6/9] x86, pkeys: add pkey set/get syscalls Dave Hansen
2016-06-07 20:47 ` Dave Hansen
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