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From: Thomas Gleixner <tglx@linutronix.de>
To: Fenghua Yu <fenghua.yu@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@elte.hu>,
	"H. Peter Anvin" <hpa@linux.intel.com>,
	Ashok Raj <ashok.raj@intel.com>,
	Dave Hansen <dave.hansen@intel.com>,
	Rafael Wysocki <rafael.j.wysocki@intel.com>,
	Tony Luck <tony.luck@intel.com>, Alan Cox <alan@linux.intel.com>,
	Ravi V Shankar <ravi.v.shankar@intel.com>,
	Arjan van de Ven <arjan@infradead.org>,
	linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses
Date: Fri, 22 Jun 2018 11:25:21 +0200 (CEST)	[thread overview]
Message-ID: <alpine.DEB.2.21.1806221122130.2402@nanos.tec.linutronix.de> (raw)
In-Reply-To: <20180621220003.GD114883@romley-ivt3.sc.intel.com>

On Thu, 21 Jun 2018, Fenghua Yu wrote:
> The control knob for user is to choose killing the process (default) or
> re-executing the faulting instruction without blocking the process.
> Re-executing the instruction maybe be useful in platforms that run
> well controlled apps with less split locks.

Again, that's totally overengineered ballast. If you care, kill the thing
and if not, then disable #AC. There are other architectures which trap on
any unaligned access, so it's nothing new.

Thanks,

	tglx

  parent reply	other threads:[~2018-06-22  9:25 UTC|newest]

Thread overview: 73+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-05-27 15:45 [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 01/16] x86/split_lock: Add CONFIG and enumerate #AC exception for split locked access feature Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 02/16] x86/split_lock: Handle #AC exception for split lock in kernel mode Fenghua Yu
2018-06-21 19:46   ` Peter Zijlstra
2018-06-22 10:49   ` Thomas Gleixner
2018-06-22 11:59     ` Thomas Gleixner
2018-06-22 22:41       ` Fenghua Yu
2018-06-22 22:57         ` Thomas Gleixner
2018-06-22 23:03           ` Thomas Gleixner
2018-06-22 23:18       ` Fenghua Yu
2018-06-23  9:08         ` Thomas Gleixner
2018-06-23  4:20     ` Fenghua Yu
2018-06-23  9:17       ` Thomas Gleixner
2018-06-23 15:05         ` Fenghua Yu
2018-06-24  0:55           ` Thomas Gleixner
2018-06-24  1:17             ` Fenghua Yu
2018-06-24  6:43               ` Thomas Gleixner
2018-05-27 15:45 ` [RFC PATCH 03/16] x86/split_lock: Set up #AC exception for split locked accesses on all CPUs Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 04/16] x86/split_lock: Use non locked bit set instruction in set_cpu_cap Fenghua Yu
2018-06-21 19:55   ` Peter Zijlstra
2018-06-21 20:37     ` Thomas Gleixner
2018-06-27 23:35     ` Fenghua Yu
2018-06-28  7:53       ` Thomas Gleixner
2018-06-28 14:23         ` Fenghua Yu
2018-06-28 14:54           ` Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 05/16] x86/split_lock: Use non atomic set and clear bit instructions in clear_cpufeature() Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 06/16] x86/split_lock: Save #AC setting for split lock in firmware in boot time and restore the setting in reboot Fenghua Yu
2018-06-21 19:58   ` Peter Zijlstra
2018-06-22 15:11     ` Alan Cox
2018-06-26  9:05       ` Peter Zijlstra
2018-06-26  9:40         ` Thomas Gleixner
2018-06-26 11:02         ` Alan Cox
2018-06-26 11:31           ` Peter Zijlstra
2018-05-27 15:45 ` [RFC PATCH 07/16] x86/split_lock: Handle suspend/hibernate and resume Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 08/16] x86/split_lock: Set split lock during EFI runtime service Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 09/16] x86/split_lock: Add CONFIG to control #AC for split lock at boot time Fenghua Yu
2018-05-27 15:45 ` [RFC PATCH 10/16] x86/split_lock: Add a debugfs interface to allow user to enable or disable #AC for split lock during run time Fenghua Yu
2018-05-29 18:43   ` Greg KH
2018-05-27 15:46 ` [RFC PATCH 11/16] x86/split_lock: Add CONFIG to control #AC for split lock from kernel at boot time Fenghua Yu
2018-05-27 15:46 ` [RFC PATCH 12/16] x86/split_lock: Add a debugfs interface to allow user to change how to handle split lock in kernel mode during run time Fenghua Yu
2018-05-27 15:46 ` [RFC PATCH 13/16] x86/split_lock: Add debugfs interface to control user mode behavior Fenghua Yu
2018-05-27 15:46 ` [RFC PATCH 14/16] x86/split_lock: Add debugfs interface to show and control firmware setting for split lock Fenghua Yu
2018-05-27 15:46 ` [RFC PATCH 15/16] x86/split_lock: Add CONFIG and debugfs interface for testing #AC for split lock in kernel mode Fenghua Yu
2018-05-27 15:46 ` [RFC PATCH 16/16] x86/split_lock: Add user space split lock test in selftest Fenghua Yu
2018-05-29 16:39 ` [RFC PATCH 00/16] x86/split_lock: Enable #AC exception for split locked accesses Dave Hansen
2018-05-29 17:25   ` Fenghua Yu
2018-05-29 17:28     ` Dave Hansen
2018-05-29 17:40       ` Fenghua Yu
2018-05-29 16:40 ` Dave Hansen
2018-05-29 17:38   ` Fenghua Yu
2018-06-21 20:06   ` Peter Zijlstra
2018-06-21 19:37 ` Peter Zijlstra
2018-06-21 20:18   ` Fenghua Yu
2018-06-21 20:32     ` Thomas Gleixner
2018-06-21 22:00       ` Fenghua Yu
2018-06-21 22:07         ` Peter Zijlstra
2018-06-21 22:08         ` Peter Zijlstra
2018-06-21 22:18           ` Dave Hansen
2018-06-21 22:42             ` Fenghua Yu
2018-06-22  8:11               ` Peter Zijlstra
2018-06-22  9:30               ` Thomas Gleixner
2018-06-21 22:10         ` Peter Zijlstra
2018-06-21 23:05           ` Fenghua Yu
2018-06-22  8:19             ` Peter Zijlstra
2018-06-21 22:11         ` Peter Zijlstra
2018-06-21 22:43           ` Fenghua Yu
2018-06-21 22:13         ` Peter Zijlstra
2018-06-23 18:47           ` Fenghua Yu
2018-06-22  9:18         ` Thomas Gleixner
2018-06-22  9:22         ` Thomas Gleixner
2018-06-22  9:25         ` Thomas Gleixner [this message]
2018-06-22  9:28         ` Thomas Gleixner
2018-06-21 20:36     ` Peter Zijlstra

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