From: Thomas Gleixner <tglx@linutronix.de>
To: speck@linutronix.de
Subject: Re: Encrypted Message
Date: Tue, 5 Mar 2019 15:55:39 +0100 (CET) [thread overview]
Message-ID: <alpine.DEB.2.21.1903051554140.1646@nanos.tec.linutronix.de> (raw)
In-Reply-To: <c3092274-fe7a-0330-cf2b-93d40070788e@redhat.com>
On Mon, 4 Mar 2019, speck for Jon Masters wrote:
> > Documentation also recommends to use a writable data segment selector:
> >
> > "The buffer overwriting occurs regardless of the result of the VERW
> > permission check, as well as when the selector is null or causes a
> > descriptor load segment violation. However, for lowest latency we
> > recommend using a selector that indicates a valid writable data
> > segment."
>
> Note that we raised this again with Intel last week amid Andrew's
> results and they are going to get back to us if this guidance changes as
> a result of further measurements on their end. It's a few cycles
> difference in the Coffeelake case, but it could always be higher.
Ok. We can fix that up on top once we have final answers.
Thanks,
tglx
next prev parent reply other threads:[~2019-03-05 14:58 UTC|newest]
Thread overview: 64+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-03-01 21:47 [patch V6 00/14] MDS basics 0 Thomas Gleixner
2019-03-01 21:47 ` [patch V6 01/14] MDS basics 1 Thomas Gleixner
2019-03-02 0:06 ` [MODERATED] " Frederic Weisbecker
2019-03-01 21:47 ` [patch V6 02/14] MDS basics 2 Thomas Gleixner
2019-03-02 0:34 ` [MODERATED] " Frederic Weisbecker
2019-03-02 8:34 ` Greg KH
2019-03-05 17:54 ` Borislav Petkov
2019-03-01 21:47 ` [patch V6 03/14] MDS basics 3 Thomas Gleixner
2019-03-02 1:12 ` [MODERATED] " Frederic Weisbecker
2019-03-01 21:47 ` [patch V6 04/14] MDS basics 4 Thomas Gleixner
2019-03-02 1:28 ` [MODERATED] " Frederic Weisbecker
2019-03-05 14:52 ` Thomas Gleixner
2019-03-06 20:00 ` [MODERATED] " Andrew Cooper
2019-03-06 20:32 ` Thomas Gleixner
2019-03-07 23:56 ` [MODERATED] " Andi Kleen
2019-03-08 0:36 ` Linus Torvalds
2019-03-01 21:47 ` [patch V6 05/14] MDS basics 5 Thomas Gleixner
2019-03-02 1:37 ` [MODERATED] " Frederic Weisbecker
2019-03-07 23:59 ` Andi Kleen
2019-03-08 6:37 ` Thomas Gleixner
2019-03-01 21:47 ` [patch V6 06/14] MDS basics 6 Thomas Gleixner
2019-03-04 6:28 ` [MODERATED] Encrypted Message Jon Masters
2019-03-05 14:55 ` Thomas Gleixner [this message]
2019-03-01 21:47 ` [patch V6 07/14] MDS basics 7 Thomas Gleixner
2019-03-02 2:22 ` [MODERATED] " Frederic Weisbecker
2019-03-05 15:30 ` Thomas Gleixner
2019-03-06 15:49 ` [MODERATED] " Frederic Weisbecker
2019-03-06 5:21 ` Borislav Petkov
2019-03-01 21:47 ` [patch V6 08/14] MDS basics 8 Thomas Gleixner
2019-03-03 2:54 ` [MODERATED] " Frederic Weisbecker
2019-03-04 6:57 ` [MODERATED] Encrypted Message Jon Masters
2019-03-04 7:06 ` Jon Masters
2019-03-04 8:12 ` Jon Masters
2019-03-05 15:34 ` Thomas Gleixner
2019-03-06 16:21 ` [MODERATED] " Jon Masters
2019-03-06 14:11 ` [MODERATED] Re: [patch V6 08/14] MDS basics 8 Borislav Petkov
2019-03-01 21:47 ` [patch V6 09/14] MDS basics 9 Thomas Gleixner
2019-03-06 16:14 ` [MODERATED] " Frederic Weisbecker
2019-03-01 21:47 ` [patch V6 10/14] MDS basics 10 Thomas Gleixner
2019-03-04 6:45 ` [MODERATED] Encrypted Message Jon Masters
2019-03-05 18:42 ` [MODERATED] Re: [patch V6 10/14] MDS basics 10 Andrea Arcangeli
2019-03-06 19:15 ` Thomas Gleixner
2019-03-06 14:31 ` [MODERATED] " Borislav Petkov
2019-03-06 15:30 ` Thomas Gleixner
2019-03-06 18:35 ` Thomas Gleixner
2019-03-06 19:34 ` [MODERATED] Re: " Borislav Petkov
2019-03-01 21:47 ` [patch V6 11/14] MDS basics 11 Thomas Gleixner
2019-03-01 21:47 ` [patch V6 12/14] MDS basics 12 Thomas Gleixner
2019-03-04 5:47 ` [MODERATED] Encrypted Message Jon Masters
2019-03-05 16:04 ` Thomas Gleixner
2019-03-05 16:40 ` [MODERATED] Re: [patch V6 12/14] MDS basics 12 mark gross
2019-03-06 14:42 ` Borislav Petkov
2019-03-01 21:47 ` [patch V6 13/14] MDS basics 13 Thomas Gleixner
2019-03-03 4:01 ` [MODERATED] " Josh Poimboeuf
2019-03-05 16:04 ` Thomas Gleixner
2019-03-05 16:43 ` [MODERATED] " mark gross
2019-03-01 21:47 ` [patch V6 14/14] MDS basics 14 Thomas Gleixner
2019-03-01 23:48 ` [patch V6 00/14] MDS basics 0 Thomas Gleixner
2019-03-04 5:30 ` [MODERATED] Encrypted Message Jon Masters
-- strict thread matches above, loose matches on Subject: below --
2019-02-21 23:44 [patch V3 0/9] MDS basics 0 Thomas Gleixner
2019-02-21 23:44 ` [patch V3 4/9] MDS basics 4 Thomas Gleixner
2019-02-22 7:45 ` [MODERATED] Encrypted Message Jon Masters
2019-02-22 17:16 ` [MODERATED] " Linus Torvalds
2019-02-22 17:40 ` Thomas Gleixner
2019-02-20 15:07 [patch V2 00/10] MDS basics+ 0 Thomas Gleixner
2019-02-20 15:07 ` [patch V2 04/10] MDS basics+ 4 Thomas Gleixner
2019-02-20 17:10 ` [MODERATED] " mark gross
2019-02-21 19:26 ` [MODERATED] Encrypted Message Tim Chen
2019-02-21 20:32 ` Thomas Gleixner
2019-01-11 17:09 zzoru
2019-01-11 17:21 ` zzoru
2019-01-11 17:57 ` zzoru
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