From: "Luck, Tony" <tony.luck@intel.com>
To: speck@linutronix.de
Subject: [MODERATED] Re: Re: [patch V4 13/13] x86/apic: Ignore secondary threads if nosmt=force
Date: Fri, 29 Jun 2018 10:01:38 -0700 [thread overview]
Message-ID: <20180629170137.GA18334@agluck-desk> (raw)
In-Reply-To: <20180629082617.GA3752@zn.tnic>
On Fri, Jun 29, 2018 at 10:26:17AM +0200, speck for Borislav Petkov wrote:
> Ok, question: what exactly does the hw/microcode do on an offlined
> logical CPU: does it test CR4.MCE first and assert that IERR# or does it
> look at MCG_CTL/MCi_CTL too so that we can try to disable MCE reporting
> on those offlined cores?
MCi_CTL may or may not save you. Banks are shared across cores or the
whole package. So if you bring any CPU online that shares the bank that
reports the error, then the offline CPUs that share that bank will have
the machine check enabled.
For the hyper-thread disabled case you are guaranteed to be screwed.
-Tony
next prev parent reply other threads:[~2018-06-29 17:01 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-06-20 20:19 [patch V4 00/13] SMT control knobs Thomas Gleixner
2018-06-20 20:19 ` [patch V4 01/13] sched/smt: Update sched_smt_present at runtime Thomas Gleixner
2018-06-20 20:19 ` [patch V4 02/13] x86/smp: Provide topology_is_primary_thread() Thomas Gleixner
2018-06-27 13:56 ` [MODERATED] " Josh Poimboeuf
2018-06-27 15:54 ` Thomas Gleixner
2018-06-27 16:20 ` [MODERATED] " Josh Poimboeuf
2018-06-27 16:52 ` Thomas Gleixner
2018-06-20 20:19 ` [patch V4 03/13] cpu/hotplug: Make bringup/teardown of smp threads symmetric Thomas Gleixner
2018-06-20 20:19 ` [patch V4 04/13] cpu/hotplug: Split do_cpu_down() Thomas Gleixner
2018-06-20 20:19 ` [patch V4 05/13] cpu/hotplug: Provide knobs to control SMT Thomas Gleixner
2018-06-20 23:05 ` [MODERATED] " Greg KH
2018-06-21 6:08 ` Thomas Gleixner
2018-06-20 20:19 ` [patch V4 06/13] x86/cpu: Remove the pointless CPU printout Thomas Gleixner
2018-06-20 20:19 ` [patch V4 07/13] x86/cpu/AMD: Remove the pointless detect_ht() call Thomas Gleixner
2018-06-20 20:19 ` [patch V4 08/13] x86/cpu/common: Provide detect_ht_early() Thomas Gleixner
2018-06-20 20:19 ` [patch V4 09/13] x86/cpu/topology: Provide detect_extended_topology_early() Thomas Gleixner
2018-06-20 20:19 ` [patch V4 10/13] x86/cpu/intel: Evaluate smp_num_siblings early Thomas Gleixner
2018-06-20 20:19 ` [patch V4 11/13] x86/CPU/AMD: Do not check CPUID max ext level before parsing SMP info Thomas Gleixner
2018-06-20 20:19 ` [patch V4 12/13] x86/cpu/AMD: Evaluate smp_num_siblings early Thomas Gleixner
2018-06-20 20:19 ` [patch V4 13/13] x86/apic: Ignore secondary threads if nosmt=force Thomas Gleixner
2018-06-20 21:44 ` [MODERATED] " Linus Torvalds
2018-06-28 22:13 ` Dave Hansen
2018-06-28 22:19 ` Andrew Cooper
2018-06-28 22:23 ` Luck, Tony
2018-06-28 22:29 ` Andrew Cooper
2018-06-29 8:26 ` [MODERATED] " Borislav Petkov
2018-06-29 17:01 ` Luck, Tony [this message]
2018-06-29 17:08 ` Linus Torvalds
2018-06-29 18:36 ` Thomas Gleixner
2018-06-29 8:50 ` Thomas Gleixner
2018-06-29 16:48 ` [MODERATED] " Dave Hansen
2018-06-20 20:53 ` [patch V4 00/13] SMT control knobs Thomas Gleixner
2018-06-21 11:52 ` [MODERATED] " Ingo Molnar
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