From: "Luck, Tony" <tony.luck@intel.com>
To: Mark D Rustad <mrustad@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Arvind Sankar <nivedita@alum.mit.edu>,
"Christopherson, Sean J" <sean.j.christopherson@intel.com>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@kernel.org>,
"Yu, Fenghua" <fenghua.yu@intel.com>,
"Ingo Molnar" <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
H Peter Anvin <hpa@zytor.com>, "Raj, Ashok" <ashok.raj@intel.com>,
"Shankar, Ravi V" <ravi.v.shankar@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>
Subject: Re: [PATCH v16] x86/split_lock: Enable split lock detection by kernel
Date: Sat, 25 Jan 2020 23:10:00 +0000 [thread overview]
Message-ID: <C3302B2F-177F-4C39-910E-EADBA9285DD0@intel.com> (raw)
In-Reply-To: <4E95BFAA-A115-4159-AA4F-6AAB548C6E6C@gmail.com>
>
> Maybe "isn't supported" is not really the right wording. I would think that if it truly weren't supported that you really shouldn't be changing the mode at all at runtime. Do you really just mean "isn't atomic"? Or is there something deeper about it? If so, are there other possible risks associated with changing the mode at runtime?
>
> Sorry, the wording just happened to catch my eye
The “modes” here means the three option selectable by command line option. Off/warn/fatal. Some earlier versions of this patch had a sysfs interface to switch things around.
Not whether we have the MSR enabled/disabled.
If Thomas or Boris finds more things to fix then I’ll take a look at clarifying this comment too.
-Tony
next prev parent reply other threads:[~2020-01-25 23:10 UTC|newest]
Thread overview: 145+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-21 0:53 [PATCH v10 0/6] Enable split lock detection for real time and debug Fenghua Yu
2019-11-21 0:53 ` [PATCH v10 1/6] x86/msr-index: Add two new MSRs Fenghua Yu
2019-11-21 0:53 ` [PATCH v10 2/6] x86/cpufeatures: Enumerate the IA32_CORE_CAPABILITIES MSR Fenghua Yu
2019-11-21 0:53 ` [PATCH v10 3/6] x86/split_lock: Enumerate split lock detection by " Fenghua Yu
2019-11-21 0:53 ` [PATCH v10 4/6] x86/split_lock: Enumerate split lock detection if the IA32_CORE_CAPABILITIES MSR is not supported Fenghua Yu
2019-11-21 22:07 ` Andy Lutomirski
2019-11-22 0:37 ` Fenghua Yu
2019-11-22 2:13 ` Andy Lutomirski
2019-11-22 9:46 ` Peter Zijlstra
2019-11-21 0:53 ` [PATCH v10 5/6] x86/split_lock: Handle #AC exception for split lock Fenghua Yu
2019-11-21 22:10 ` Andy Lutomirski
2019-11-21 23:14 ` Fenghua Yu
2019-11-21 23:12 ` Andy Lutomirski
2019-11-21 0:53 ` [PATCH v10 6/6] x86/split_lock: Enable split lock detection by kernel parameter Fenghua Yu
2019-11-21 6:04 ` Ingo Molnar
2019-11-21 13:01 ` Peter Zijlstra
2019-11-21 13:15 ` Peter Zijlstra
2019-11-21 21:51 ` Luck, Tony
2019-11-21 22:24 ` Andy Lutomirski
2019-11-21 22:29 ` Luck, Tony
2019-11-21 23:18 ` Andy Lutomirski
2019-11-21 23:53 ` Fenghua Yu
2019-11-22 1:52 ` Sean Christopherson
2019-11-22 2:21 ` Andy Lutomirski
2019-11-22 2:39 ` Xiaoyao Li
2019-11-22 2:57 ` Andy Lutomirski
2019-11-21 23:55 ` Luck, Tony
2019-11-22 0:55 ` Luck, Tony
2019-11-22 10:08 ` Peter Zijlstra
2019-11-21 16:14 ` Fenghua Yu
2019-11-21 17:14 ` Ingo Molnar
2019-11-21 17:35 ` Peter Zijlstra
2019-11-21 17:12 ` Ingo Molnar
2019-11-21 17:34 ` Luck, Tony
2019-11-22 10:51 ` Peter Zijlstra
2019-11-22 15:27 ` Peter Zijlstra
2019-11-22 17:22 ` Luck, Tony
2019-11-22 20:23 ` Peter Zijlstra
2019-11-22 18:02 ` Luck, Tony
2019-11-22 20:23 ` Peter Zijlstra
2019-11-22 20:42 ` Fenghua Yu
2019-11-22 21:25 ` Andy Lutomirski
2019-12-12 8:57 ` Peter Zijlstra
2019-12-12 18:52 ` Luck, Tony
2019-12-12 19:46 ` Luck, Tony
2019-12-12 20:01 ` Andy Lutomirski
2019-12-16 16:21 ` David Laight
2019-11-22 18:44 ` Sean Christopherson
2019-11-22 20:30 ` Peter Zijlstra
2019-11-23 0:30 ` Luck, Tony
2019-11-25 16:13 ` Sean Christopherson
2019-12-02 18:20 ` Luck, Tony
2019-12-12 8:59 ` Peter Zijlstra
2020-01-10 19:24 ` [PATCH v11] x86/split_lock: Enable split lock detection by kernel Luck, Tony
2020-01-14 5:55 ` Sean Christopherson
2020-01-15 22:27 ` Luck, Tony
2020-01-15 22:57 ` Sean Christopherson
2020-01-15 23:48 ` Luck, Tony
2020-01-22 18:55 ` [PATCH v12] " Luck, Tony
2020-01-22 19:04 ` Borislav Petkov
2020-01-22 20:03 ` Luck, Tony
2020-01-22 20:55 ` Borislav Petkov
2020-01-22 22:42 ` Arvind Sankar
2020-01-22 22:52 ` Arvind Sankar
2020-01-22 23:24 ` Luck, Tony
2020-01-23 0:45 ` Arvind Sankar
2020-01-23 1:23 ` Luck, Tony
2020-01-23 4:21 ` Arvind Sankar
2020-01-23 17:15 ` Luck, Tony
2020-01-23 3:53 ` [PATCH v13] " Luck, Tony
2020-01-23 4:45 ` Arvind Sankar
2020-01-23 23:16 ` [PATCH v14] " Luck, Tony
2020-01-24 21:36 ` Thomas Gleixner
2020-01-25 2:47 ` [PATCH v15] " Luck, Tony
2020-01-25 10:44 ` Borislav Petkov
2020-01-25 19:55 ` Luck, Tony
2020-01-25 20:12 ` Peter Zijlstra
2020-01-25 20:33 ` Borislav Petkov
2020-01-25 21:42 ` Luck, Tony
2020-01-25 22:17 ` Borislav Petkov
2020-01-25 20:29 ` Borislav Petkov
2020-01-25 13:41 ` Thomas Gleixner
2020-01-25 22:07 ` [PATCH v16] " Luck, Tony
2020-01-25 22:43 ` Mark D Rustad
2020-01-25 23:10 ` Luck, Tony [this message]
2020-01-26 17:27 ` Mark D Rustad
2020-01-26 20:05 ` [PATCH v17] " Luck, Tony
2020-01-29 12:31 ` Thomas Gleixner
2020-01-29 15:24 ` [tip: x86/cpu] " tip-bot2 for Peter Zijlstra (Intel)
2020-02-03 20:41 ` [PATCH v17] " Sean Christopherson
2020-02-06 0:49 ` [PATCH] x86/split_lock: Avoid runtime reads of the TEST_CTRL MSR Luck, Tony
2020-02-06 1:18 ` Andy Lutomirski
2020-02-06 16:46 ` Luck, Tony
2020-02-06 19:37 ` Andy Lutomirski
2020-03-03 19:22 ` Sean Christopherson
2020-02-04 0:04 ` [PATCH v17] x86/split_lock: Enable split lock detection by kernel Sean Christopherson
2020-02-04 12:52 ` Thomas Gleixner
2020-01-26 0:34 ` [PATCH v16] " Andy Lutomirski
2020-01-26 20:01 ` Luck, Tony
2020-01-25 21:25 ` [PATCH v15] " Arvind Sankar
2020-01-25 21:50 ` Luck, Tony
2020-01-25 23:51 ` Arvind Sankar
2020-01-26 2:52 ` Luck, Tony
2020-01-27 2:05 ` Tony Luck
2020-01-27 8:04 ` Peter Zijlstra
2020-01-27 8:36 ` Peter Zijlstra
2020-01-27 17:35 ` Luck, Tony
2020-01-27 8:02 ` Peter Zijlstra
2019-12-13 0:09 ` [PATCH v11] x86/split_lock: Enable split lock detection by kernel parameter Tony Luck
2019-12-13 0:16 ` Luck, Tony
2019-11-21 17:43 ` [PATCH v10 6/6] " David Laight
2019-11-21 17:51 ` Andy Lutomirski
2019-11-21 18:53 ` Fenghua Yu
2019-11-21 19:01 ` Andy Lutomirski
2019-11-21 20:25 ` Fenghua Yu
2019-11-21 20:19 ` Peter Zijlstra
2019-11-21 19:46 ` Peter Zijlstra
2019-11-21 20:25 ` Peter Zijlstra
2019-11-21 21:22 ` Andy Lutomirski
2019-11-22 9:25 ` Peter Zijlstra
2019-11-22 17:48 ` Luck, Tony
2019-11-22 20:31 ` Peter Zijlstra
2019-11-22 21:23 ` Andy Lutomirski
2019-12-11 17:52 ` Peter Zijlstra
2019-12-11 18:12 ` Andy Lutomirski
2019-12-11 22:34 ` Peter Zijlstra
2019-12-12 19:40 ` Andy Lutomirski
2019-12-16 9:59 ` David Laight
2019-12-16 17:22 ` Andy Lutomirski
2019-12-16 17:45 ` David Laight
2019-12-16 18:06 ` Andy Lutomirski
2019-12-17 10:03 ` David Laight
2019-12-11 18:44 ` Luck, Tony
2019-12-11 22:39 ` Peter Zijlstra
2019-12-12 10:36 ` David Laight
2019-12-12 13:04 ` Peter Zijlstra
2019-12-12 16:02 ` Andy Lutomirski
2019-12-12 16:23 ` David Laight
2019-12-12 16:29 ` David Laight
2019-11-21 19:56 ` Peter Zijlstra
2019-11-21 21:01 ` Andy Lutomirski
2019-11-22 9:36 ` Peter Zijlstra
2019-11-22 9:46 ` David Laight
2019-11-22 20:32 ` Peter Zijlstra
2019-11-21 8:00 ` Peter Zijlstra
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