linux-kernel - Re: [PATCH 3.10 126/129] clocksource: arch

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Message-ID: <20140108092512.GA6701@e106331-lin.cambridge.arm.com>
Date:	Wed, 8 Jan 2014 09:25:12 +0000
From:	Mark Rutland <mark.rutland@....com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"stable@...r.kernel.org" <stable@...r.kernel.org>,
	Catalin Marinas <Catalin.Marinas@....com>,
	Marc Zyngier <Marc.Zyngier@....com>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	"rob.herring@...xeda.com" <rob.herring@...xeda.com>,
	Mark Brown <broonie@...nel.org>,
	John Garry <john.garry@...adcom.com>
Subject: Re: [PATCH 3.10 126/129] clocksource: arch_timer: use virtual
 counters

On Tue, Jan 07, 2014 at 06:50:40PM +0000, Greg Kroah-Hartman wrote:
> On Tue, Jan 07, 2014 at 10:09:50AM +0000, Mark Rutland wrote:
> > Hi Greg,
> > 
> > On Mon, Jan 06, 2014 at 10:39:15PM +0000, Greg Kroah-Hartman wrote:
> > > 3.10-stable review patch.  If anyone has any objections, please let me know.
> > 
> > This patch alone may break ARM systems booted at hyp mode or when KVM is
> > in use, causing CPUs to have different views of time or for a given
> > CPU's view of time to jump backwards.
> > 
> > The following two commits in mainline fix those two problems by ensuring
> > all CPUs have the same virtual timer offset (zero), and maintaining it
> > across KVM world switches. On arm64 the requisite CNTVOFF zeroing is
> > already present in linux-3.10.y.
> > 
> > 0af0b189abf7 (ARM: hyp: initialize CNTVOFF to zero)
> > f793c23ebbe5 (ARM: KVM: arch_timers: zero CNTVOFF upon return to host)
> 
> Thanks, I've now queued up both of these patches as well.  With that, we
> should be ok, right?

Cheers. I believe that should be sufficient, yes.

Mark.
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