From: Peter Zijlstra <peterz@infradead.org>
To: Xiaoyao Li <xiaoyao.li@intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Paolo Bonzini <pbonzini@redhat.com>,
Sean Christopherson <sean.j.christopherson@intel.com>,
Fenghua Yu <fenghua.yu@intel.com>, Ingo Molnar <mingo@redhat.com>,
Borislav Petkov <bp@alien8.de>, H Peter Anvin <hpa@zytor.com>,
Andrew Morton <akpm@linux-foundation.org>,
Dave Hansen <dave.hansen@intel.com>,
Radim Krcmar <rkrcmar@redhat.com>,
Ashok Raj <ashok.raj@intel.com>, Tony Luck <tony.luck@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Sai Praneeth Prakhya <sai.praneeth.prakhya@intel.com>,
Ravi V Shankar <ravi.v.shankar@intel.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>,
kvm@vger.kernel.org
Subject: Re: [RFD] x86/split_lock: Request to Intel
Date: Fri, 18 Oct 2019 12:43:07 +0200 [thread overview]
Message-ID: <20191018104307.GG2328@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <763bb046-e016-9440-55c4-33438e35e436@intel.com>
On Fri, Oct 18, 2019 at 06:20:44PM +0800, Xiaoyao Li wrote:
> We enable #AC on all cores/threads to detect split lock.
> -If user space causes #AC, sending SIGBUS to it.
> -If kernel causes #AC, we globally disable #AC on all cores/threads,
> letting kernel go on working and WARN. (only disabling #AC on the thread
> generates it just doesn't help, since the buggy kernel code is possible to
> run on any threads and thus disabling #AC on all of them)
>
> As described above, either enabled globally or disabled globally, so whether
> it's per-core or per-thread really doesn't matter
Go back and read the friggin' thread already. A big clue: virt ruins it
(like it tends to do).
next prev parent reply other threads:[~2019-10-18 10:43 UTC|newest]
Thread overview: 76+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-18 22:41 [PATCH v9 00/17] x86/split_lock: Enable split lock detection Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 01/17] x86/common: Align cpu_caps_cleared and cpu_caps_set to unsigned long Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 02/17] drivers/net/b44: Align pwol_mask to unsigned long for better performance Fenghua Yu
2019-06-24 15:12 ` David Laight
2019-06-24 18:43 ` Paolo Bonzini
2019-06-18 22:41 ` [PATCH v9 03/17] x86/split_lock: Align x86_capability to unsigned long to avoid split locked access Fenghua Yu
2019-06-24 15:12 ` David Laight
2019-06-25 23:54 ` Fenghua Yu
2019-06-26 19:15 ` Thomas Gleixner
2019-06-18 22:41 ` [PATCH v9 04/17] x86/msr-index: Define MSR_IA32_CORE_CAP and split lock detection bit Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 05/17] x86/cpufeatures: Enumerate MSR_IA32_CORE_CAP Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 06/17] x86/split_lock: Enumerate split lock detection by MSR_IA32_CORE_CAP Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 07/17] x86/split_lock: Enumerate split lock detection on Icelake mobile processor Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 08/17] x86/split_lock: Define MSR TEST_CTL register Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 09/17] x86/split_lock: Handle #AC exception for split lock Fenghua Yu
2019-06-26 20:20 ` Thomas Gleixner
2019-06-26 20:36 ` Fenghua Yu
2019-06-26 21:47 ` Thomas Gleixner
2019-09-25 18:09 ` Sean Christopherson
2019-10-16 6:58 ` Xiaoyao Li
2019-10-16 9:29 ` Thomas Gleixner
2019-10-16 15:59 ` Sean Christopherson
2019-10-16 9:40 ` Paolo Bonzini
2019-10-16 9:47 ` Thomas Gleixner
2019-10-16 10:16 ` Paolo Bonzini
2019-10-16 11:23 ` Xiaoyao Li
2019-10-16 11:26 ` Paolo Bonzini
2019-10-16 13:13 ` Xiaoyao Li
2019-10-16 14:43 ` Thomas Gleixner
2019-10-16 15:37 ` Paolo Bonzini
2019-10-16 16:25 ` Xiaoyao Li
2019-10-16 16:38 ` Paolo Bonzini
2019-10-17 12:29 ` [RFD] x86/split_lock: Request to Intel Thomas Gleixner
2019-10-17 17:23 ` Sean Christopherson
2019-10-17 21:31 ` Thomas Gleixner
2019-10-17 23:38 ` Sean Christopherson
2019-10-17 23:28 ` Luck, Tony
2019-10-18 10:45 ` David Laight
2019-10-18 21:03 ` hpa
2019-10-18 2:36 ` Xiaoyao Li
2019-10-18 9:02 ` Thomas Gleixner
2019-10-18 10:20 ` Xiaoyao Li
2019-10-18 10:43 ` Peter Zijlstra [this message]
2019-10-16 11:49 ` [PATCH v9 09/17] x86/split_lock: Handle #AC exception for split lock Thomas Gleixner
2019-10-16 11:58 ` Paolo Bonzini
2019-10-16 13:51 ` Xiaoyao Li
2019-10-16 14:08 ` Paolo Bonzini
2019-10-16 14:14 ` David Laight
2019-10-16 15:03 ` Thomas Gleixner
2019-10-16 15:41 ` Sean Christopherson
2019-10-16 15:43 ` Paolo Bonzini
2019-10-16 16:23 ` Sean Christopherson
2019-10-16 17:42 ` Sean Christopherson
2019-10-17 1:23 ` Xiaoyao Li
2019-10-21 13:06 ` Paolo Bonzini
2019-10-21 13:03 ` Paolo Bonzini
2019-10-21 13:02 ` Paolo Bonzini
2019-10-16 14:50 ` Thomas Gleixner
2019-06-18 22:41 ` [PATCH v9 10/17] kvm/x86: Emulate MSR IA32_CORE_CAPABILITY Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 11/17] kvm/vmx: Emulate MSR TEST_CTL Fenghua Yu
2019-06-27 2:24 ` Xiaoyao Li
2019-06-27 7:12 ` Thomas Gleixner
2019-06-27 7:58 ` Xiaoyao Li
2019-06-27 12:11 ` Thomas Gleixner
2019-06-27 12:22 ` Xiaoyao Li
2019-06-18 22:41 ` [PATCH v9 12/17] x86/split_lock: Enable split lock detection by default Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 13/17] x86/split_lock: Disable split lock detection by kernel parameter "nosplit_lock_detect" Fenghua Yu
2019-06-26 20:34 ` Thomas Gleixner
2019-06-26 20:37 ` Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 14/17] x86/split_lock: Add a debugfs interface to enable/disable split lock detection during run time Fenghua Yu
2019-06-26 21:37 ` Thomas Gleixner
2019-06-18 22:41 ` [PATCH v9 15/17] x86/split_lock: Add documentation for split lock detection interface Fenghua Yu
2019-06-26 21:51 ` Thomas Gleixner
2019-06-18 22:41 ` [PATCH v9 16/17] x86/split_lock: Reorganize few header files in order to call WARN_ON_ONCE() in atomic bit ops Fenghua Yu
2019-06-18 22:41 ` [PATCH v9 17/17] x86/split_lock: Warn on unaligned address in atomic bit operations Fenghua Yu
2019-06-26 22:00 ` Thomas Gleixner
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