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From: Greg KH <gregkh@linuxfoundation.org>
To: speck@linutronix.de
Subject: [MODERATED] Re: [patch V10 02/10] Control knobs and Documentation 2
Date: Thu, 12 Jul 2018 19:09:11 +0200	[thread overview]
Message-ID: <20180712170911.GC23030@kroah.com> (raw)
In-Reply-To: <20180712142957.114708196@linutronix.de>

On Thu, Jul 12, 2018 at 04:19:04PM +0200, speck for Thomas Gleixner wrote:
> Subject: [patch V10 02/10] x86/kvm: Drop L1TF MSR list approach
> From: Thomas Gleixner <tglx@linutronix.de>
> 
> The VMX module parameter to control the L1D flush should become
> writeable.
> 
> The MSR list is set up at VM init per guest VCPU, but the run time
> switching is based on a static key which is global. Toggling the MSR list
> at run time might be feasible, but for now drop this optimization and use
> the regular MSR write to make run-time switching possible.
> 
> The default mitigation is the conditional flush anyway, so for extra
> paranoid setups this will add some small overhead, but the extra code
> executed is in the noise compared to the flush itself.
> 
> Aside of that the EPT disabled case is not handled correctly at the moment
> and the MSR list magic is in the way for fixing that as well.
> 
> If it's really providing a significant advantage, then this needs to be
> revisited after the code is correct and the control is writable.
> 
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

  reply	other threads:[~2018-07-12 17:09 UTC|newest]

Thread overview: 49+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-12 14:19 [patch V10 00/10] Control knobs and Documentation 0 Thomas Gleixner
2018-07-12 14:19 ` [patch V10 01/10] Control knobs and Documentation 1 Thomas Gleixner
2018-07-12 15:34   ` [MODERATED] " Greg KH
2018-07-12 15:38     ` Thomas Gleixner
2018-07-12 15:46       ` Thomas Gleixner
2018-07-12 17:08         ` [MODERATED] " Greg KH
2018-07-12 14:19 ` [patch V10 02/10] Control knobs and Documentation 2 Thomas Gleixner
2018-07-12 17:09   ` Greg KH [this message]
2018-07-12 14:19 ` [patch V10 03/10] Control knobs and Documentation 3 Thomas Gleixner
2018-07-12 16:13   ` [MODERATED] " Josh Poimboeuf
2018-07-13  9:10     ` Thomas Gleixner
2018-07-12 17:09   ` [MODERATED] " Greg KH
2018-07-12 14:19 ` [patch V10 04/10] Control knobs and Documentation 4 Thomas Gleixner
2018-07-12 17:10   ` [MODERATED] " Greg KH
2018-07-12 14:19 ` [patch V10 05/10] Control knobs and Documentation 5 Thomas Gleixner
2018-07-12 17:10   ` [MODERATED] " Greg KH
2018-07-12 14:19 ` [patch V10 06/10] Control knobs and Documentation 6 Thomas Gleixner
2018-07-12 16:14   ` [MODERATED] " Josh Poimboeuf
2018-07-12 17:10   ` Greg KH
2018-07-12 14:19 ` [patch V10 07/10] Control knobs and Documentation 7 Thomas Gleixner
2018-07-12 17:11   ` [MODERATED] " Greg KH
2018-07-12 14:19 ` [patch V10 08/10] Control knobs and Documentation 8 Thomas Gleixner
2018-07-12 16:22   ` [MODERATED] " Josh Poimboeuf
2018-07-12 17:12     ` Greg KH
2018-07-13  9:18     ` Thomas Gleixner
2018-07-12 17:17   ` [MODERATED] " Greg KH
2018-07-12 14:19 ` [patch V10 09/10] Control knobs and Documentation 9 Thomas Gleixner
2018-07-12 16:24   ` [MODERATED] " Josh Poimboeuf
2018-07-12 17:17     ` Greg KH
2018-07-12 17:16   ` Greg KH
2018-07-15  3:12   ` Kees Cook
2018-07-12 14:19 ` [patch V10 10/10] Control knobs and Documentation 10 Thomas Gleixner
2018-07-12 16:03   ` [MODERATED] " Linus Torvalds
2018-07-12 16:31     ` Peter Zijlstra
2018-07-12 16:13   ` Josh Poimboeuf
2018-07-12 16:26     ` Josh Poimboeuf
2018-07-13  9:09     ` Thomas Gleixner
2018-07-12 17:18   ` [MODERATED] " Greg KH
2018-07-15  7:30   ` Borislav Petkov
2018-07-27 16:41   ` Dave Hansen
2018-07-12 14:54 ` [patch V10 00/10] Control knobs and Documentation 0 Thomas Gleixner
2018-07-12 19:30 ` [MODERATED] " Josh Poimboeuf
2018-07-13 15:03   ` Thomas Gleixner
2018-07-13  8:30 ` [MODERATED] " Jiri Kosina
2018-07-13 16:22 ` Paolo Bonzini
2018-07-13 16:56   ` Andrew Cooper
2018-07-13 17:01     ` Paolo Bonzini
2018-07-13 17:28   ` Konrad Rzeszutek Wilk
2018-07-15 13:58     ` Paolo Bonzini

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