From: Peter Zijlstra <peterz@infradead.org>
To: David Laight <David.Laight@ACULAB.COM>
Cc: 'Thomas Gleixner' <tglx@linutronix.de>,
'Fenghua Yu' <fenghua.yu@intel.com>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
H Peter Anvin <hpa@zytor.com>,
Paolo Bonzini <pbonzini@redhat.com>,
Dave Hansen <dave.hansen@intel.com>,
Ashok Raj <ashok.raj@intel.com>,
Ravi V Shankar <ravi.v.shankar@intel.com>,
Xiaoyao Li <xiaoyao.li@intel.com>,
Christopherson Sean J <sean.j.christopherson@intel.com>,
Kalle Valo <kvalo@codeaurora.org>,
Michael Chan <michael.chan@broadcom.com>,
linux-kernel <linux-kernel@vger.kernel.org>, x86 <x86@kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
"netdev@vger.kernel.org" <netdev@vger.kernel.org>,
"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>
Subject: Re: [PATCH v8 13/15] x86/split_lock: Enable split lock detection by default
Date: Thu, 25 Apr 2019 13:41:37 +0200 [thread overview]
Message-ID: <20190425114137.GO4038@hirez.programming.kicks-ass.net> (raw)
In-Reply-To: <551673e41ac649689243cbe060364b0d@AcuMS.aculab.com>
On Thu, Apr 25, 2019 at 11:13:23AM +0000, David Laight wrote:
> I'm not at all sure that 'compare and exchange' operations
> are atomic on all cpus if the data is misaligned and crosses
> a page boundary and either (or both) pages need faulting in
> (or hit a TLB miss).
Most sane architectures already trap if you attempt that.
next prev parent reply other threads:[~2019-04-25 11:41 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-24 19:32 [PATCH v8 00/15] x86/split_lock: Enable split lock detection Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 01/15] x86/common: Align cpu_caps_cleared and cpu_caps_set to unsigned long Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 02/15] drivers/net/b44: Align pwol_mask to unsigned long for better performance Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 03/15] wlcore: simplify/fix/optimize reg_ch_conf_pending operations Fenghua Yu
2019-04-25 17:12 ` Kalle Valo
2019-04-24 19:32 ` [PATCH v8 04/15] x86/split_lock: Align x86_capability to unsigned long to avoid split locked access Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 05/15] x86/msr-index: Define MSR_IA32_CORE_CAPABILITY and split lock detection bit Fenghua Yu
2019-04-25 5:45 ` Ingo Molnar
2019-04-25 19:01 ` Fenghua Yu
2019-04-25 19:47 ` Ingo Molnar
2019-04-25 19:51 ` Fenghua Yu
2019-04-25 20:08 ` Ingo Molnar
2019-04-25 20:22 ` Fenghua Yu
2019-04-26 6:00 ` Ingo Molnar
2019-05-06 0:12 ` Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 06/15] x86/cpufeatures: Enumerate MSR_IA32_CORE_CAPABILITY Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 07/15] x86/split_lock: Enumerate split lock detection by MSR_IA32_CORE_CAPABILITY Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 08/15] x86/split_lock: Enumerate split lock detection on Icelake mobile processor Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 09/15] x86/split_lock: Define MSR TEST_CTL register Fenghua Yu
2019-04-25 6:21 ` Ingo Molnar
2019-04-25 19:48 ` Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 10/15] x86/split_lock: Handle #AC exception for split lock Fenghua Yu
2019-04-25 6:07 ` Ingo Molnar
2019-04-25 7:29 ` Thomas Gleixner
2019-04-24 19:32 ` [PATCH v8 11/15] kvm/x86: Emulate MSR IA32_CORE_CAPABILITY Fenghua Yu
2019-04-24 19:32 ` [PATCH v8 12/15] kvm/vmx: Emulate MSR TEST_CTL Fenghua Yu
2019-04-25 7:42 ` Thomas Gleixner
2019-04-27 12:20 ` Xiaoyao Li
2019-04-28 7:09 ` Thomas Gleixner
2019-04-28 7:34 ` Xiaoyao Li
2019-04-29 7:31 ` Thomas Gleixner
2019-04-29 5:21 ` Xiaoyao Li
2019-04-24 19:33 ` [PATCH v8 13/15] x86/split_lock: Enable split lock detection by default Fenghua Yu
2019-04-25 7:50 ` Thomas Gleixner
2019-05-06 21:39 ` Fenghua Yu
2019-04-25 10:52 ` David Laight
2019-04-25 10:58 ` Thomas Gleixner
2019-04-25 11:13 ` David Laight
2019-04-25 11:41 ` Peter Zijlstra [this message]
2019-04-25 13:04 ` Thomas Gleixner
2019-05-07 20:48 ` Fenghua Yu
2019-04-24 19:33 ` [PATCH v8 14/15] x86/split_lock: Disable split lock detection by kernel parameter "nosplit_lock_detect" Fenghua Yu
2019-04-24 19:33 ` [PATCH v8 15/15] x86/split_lock: Add a sysfs interface to enable/disable split lock detection during run time Fenghua Yu
2019-04-25 6:31 ` Ingo Molnar
2019-05-06 0:21 ` Fenghua Yu
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190425114137.GO4038@hirez.programming.kicks-ass.net \
--to=peterz@infradead.org \
--cc=David.Laight@ACULAB.COM \
--cc=ashok.raj@intel.com \
--cc=bp@alien8.de \
--cc=dave.hansen@intel.com \
--cc=fenghua.yu@intel.com \
--cc=hpa@zytor.com \
--cc=kvalo@codeaurora.org \
--cc=kvm@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-wireless@vger.kernel.org \
--cc=michael.chan@broadcom.com \
--cc=mingo@redhat.com \
--cc=netdev@vger.kernel.org \
--cc=pbonzini@redhat.com \
--cc=ravi.v.shankar@intel.com \
--cc=sean.j.christopherson@intel.com \
--cc=tglx@linutronix.de \
--cc=x86@kernel.org \
--cc=xiaoyao.li@intel.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).