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From: Dan Williams <dan.j.williams@intel.com>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: "Luck, Tony" <tony.luck@intel.com>,
	"Joseph, Jithu" <jithu.joseph@intel.com>,
	 "hdegoede@redhat.com" <hdegoede@redhat.com>,
	"markgross@kernel.org" <markgross@kernel.org>,
	 "tglx@linutronix.de" <tglx@linutronix.de>,
	"mingo@redhat.com" <mingo@redhat.com>,
	"bp@alien8.de" <bp@alien8.de>,
	 "dave.hansen@linux.intel.com" <dave.hansen@linux.intel.com>,
	"x86@kernel.org" <x86@kernel.org>,
	 "hpa@zytor.com" <hpa@zytor.com>,
	"corbet@lwn.net" <corbet@lwn.net>,
	 "andriy.shevchenko@linux.intel.com"
	<andriy.shevchenko@linux.intel.com>,
	"Raj, Ashok" <ashok.raj@intel.com>,
	 "rostedt@goodmis.org" <rostedt@goodmis.org>,
	 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	 "linux-doc@vger.kernel.org" <linux-doc@vger.kernel.org>,
	 "platform-driver-x86@vger.kernel.org"
	<platform-driver-x86@vger.kernel.org>,
	 "patches@lists.linux.dev" <patches@lists.linux.dev>,
	"Shankar, Ravi V" <ravi.v.shankar@intel.com>
Subject: Re: [RFC 00/10] Introduce In Field Scan driver
Date: Tue, 15 Mar 2022 09:09:18 -0700	[thread overview]
Message-ID: <CAPcyv4gdbjHem9zwoCjj+6a2KJ5dyYro3OwPvNLSPTKpjeF0hg@mail.gmail.com> (raw)
In-Reply-To: <CAPcyv4iU5mXAjkUe-c_-Ba4Ejse90gqd=db+00jybnkV1-K6=g@mail.gmail.com>

On Tue, Mar 15, 2022 at 9:04 AM Dan Williams <dan.j.williams@intel.com> wrote:
>
> On Tue, Mar 15, 2022 at 8:27 AM Greg KH <gregkh@linuxfoundation.org> wrote:
> >
> > On Tue, Mar 15, 2022 at 02:59:03PM +0000, Luck, Tony wrote:
> > > >> This seems a novel use of uevent ... is it OK, or is is abuse?
> > > >
> > > > Don't create "novel" uses of uevents.  They are there to express a
> > > > change in state of a device so that userspace can then go and do
> > > > something with that information.  If that pattern fits here, wonderful.
> > >
> > > Maybe Dan will chime in here to better explain his idea. I think for
> > > the case where the core test fails, there is a good match with uevent.
> > > The device (one CPU core) has changed state from "working" to
> > > "untrustworthy". Userspace can do things like: take the logical CPUs
> > > on that core offline, initiate a service call, or in a VMM cluster environment
> > > migrate work to a different node.
> >
> > Again, I have no idea what you are doing at all with this driver, nor
> > what you want to do with it.
> >
> > Start over please.
> >
> > What is the hardware you have to support?
> >
> > What is the expectation from userspace with regards to using the
> > hardware?
>
> Here is what I have learned about this driver since engaging on this
> patch set. Cores go bad at run time. Datacenters can detect them at
> scale.

Tony pointed me to this video if you have not seen it:

https://www.youtube.com/watch?v=QMF3rqhjYuM

  reply	other threads:[~2022-03-15 16:09 UTC|newest]

Thread overview: 62+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-03-01 19:54 [RFC 00/10] Introduce In Field Scan driver Jithu Joseph
2022-03-01 19:54 ` [RFC 01/10] x86/microcode/intel: expose collect_cpu_info_early() for IFS Jithu Joseph
2022-03-01 20:08   ` Greg KH
2022-03-02  0:56     ` Joseph, Jithu
2022-03-02 10:30   ` Borislav Petkov
2022-03-03  1:34     ` Joseph, Jithu
2022-03-01 19:54 ` [RFC 02/10] Documentation: In-Field Scan Jithu Joseph
2022-03-01 20:07   ` Greg KH
2022-03-02  0:58     ` Joseph, Jithu
2022-03-01 19:54 ` [RFC 03/10] platform/x86/intel/ifs: Add driver for " Jithu Joseph
2022-03-02 23:24   ` Williams, Dan J
2022-03-02 23:31     ` Raj, Ashok
2022-03-03  0:02     ` Luck, Tony
2022-03-03  2:04     ` Joseph, Jithu
2022-03-01 19:54 ` [RFC 04/10] platform/x86/intel/ifs: Load IFS Image Jithu Joseph
2022-03-03  2:58   ` Williams, Dan J
2022-03-01 19:54 ` [RFC 05/10] platform/x86/intel/ifs: Check IFS Image sanity Jithu Joseph
2022-03-01 19:54 ` [RFC 06/10] platform/x86/intel/ifs: Authenticate and copy to secured memory Jithu Joseph
2022-03-01 19:54 ` [RFC 07/10] platform/x86/intel/ifs: Create kthreads for online cpus for scan test Jithu Joseph
2022-03-03  4:17   ` Williams, Dan J
2022-03-03 19:59     ` Luck, Tony
2022-03-04 19:20     ` Joseph, Jithu
2022-03-07 16:52       ` Dan Williams
2022-03-07 17:46         ` Luck, Tony
2022-03-10 21:42           ` Kok, Auke
2022-03-01 19:54 ` [RFC 08/10] platform/x86/intel/ifs: Add IFS sysfs interface Jithu Joseph
2022-03-04  0:31   ` Williams, Dan J
2022-03-04 16:51     ` Luck, Tony
2022-03-04 20:42     ` Joseph, Jithu
2022-03-04 21:01       ` Luck, Tony
2022-03-21 21:15         ` Luck, Tony
2022-03-07 17:38       ` Dan Williams
2022-03-07 19:09         ` Joseph, Jithu
2022-03-07 19:15           ` Dan Williams
2022-03-07 19:55             ` Joseph, Jithu
2022-03-07 20:25               ` Dan Williams
2022-03-07 20:56                 ` Joseph, Jithu
2022-03-07 21:28                   ` Dan Williams
2022-03-07 21:30                   ` gregkh
2022-03-07 21:33                     ` Luck, Tony
2022-03-01 19:54 ` [RFC 09/10] platform/x86/intel/ifs: add ABI documentation for IFS Jithu Joseph
2022-03-04  0:57   ` Williams, Dan J
2022-03-01 19:54 ` [RFC 10/10] trace: platform/x86/intel/ifs: Add trace point to track Intel IFS operations Jithu Joseph
2022-03-01 20:17   ` Steven Rostedt
2022-03-02  1:02     ` Joseph, Jithu
2022-03-01 20:10 ` [RFC 00/10] Introduce In Field Scan driver Greg KH
2022-03-01 20:14   ` Greg KH
2022-03-14 23:10     ` Luck, Tony
2022-03-15  7:34       ` Greg KH
2022-03-15 14:59         ` Luck, Tony
2022-03-15 15:26           ` Greg KH
2022-03-15 16:04             ` Dan Williams
2022-03-15 16:09               ` Dan Williams [this message]
2022-03-15 16:10             ` Luck, Tony
2022-03-16  8:09               ` Greg KH
2022-03-02 15:33   ` Steven Rostedt
2022-03-02 16:20     ` Greg KH
2022-03-02 13:59 ` Andy Lutomirski
2022-03-02 20:29   ` Luck, Tony
2022-03-02 21:18     ` Andy Lutomirski
2022-03-02 21:41       ` Luck, Tony
2022-03-02 23:11 ` Williams, Dan J

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