From: KY Srinivasan <kys@microsoft.com>
To: Jeff Leung <jleung@v10networks.ca>, "x86@kernel.org" <x86@kernel.org>,
        "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        "devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
        "olaf@aepfle.de" <olaf@aepfle.de>,
        "apw@canonical.com" <apw@canonical.com>,
        "jasowang@redhat.com" <jasowang@redhat.com>,
        "tglx@linutronix.de" <tglx@linutronix.de>,
        "hpa@zytor.com" <hpa@zytor.com>
CC: "stable@vger.kernel.org" <stable@vger.kernel.org>
Subject: RE: [PATCH 1/1] X86: Mark the Hyper-V clocksource as being continuous
Thread-Topic: [PATCH 1/1] X86: Mark the Hyper-V clocksource as being
 continuous
Thread-Index: AQHQDos/PK3eN3W9k0ulFthqgd8G05x8+ngAgAABYnA=
Date: Wed, 3 Dec 2014 00:06:46 +0000
Message-ID: <BY2PR0301MB0711D77DC4E020F9824BC9D7A07B0@BY2PR0301MB0711.namprd03.prod.outlook.com>
References: <1417568621-23143-1-git-send-email-kys@microsoft.com>
 <A70AC0C1B7E7FD478A6BF19705461AA01109C0@IMBER.smb.curriegrad2004.ca>
In-Reply-To: <A70AC0C1B7E7FD478A6BF19705461AA01109C0@IMBER.smb.curriegrad2004.ca>
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> -----Original Message-----
> From: Jeff Leung [mailto:jleung@v10networks.ca]
> Sent: Tuesday, December 2, 2014 3:58 PM
> To: KY Srinivasan; x86@kernel.org; gregkh@linuxfoundation.org; linux-
> kernel@vger.kernel.org; devel@linuxdriverproject.org; olaf@aepfle.de;
> apw@canonical.com; jasowang@redhat.com; tglx@linutronix.de;
> hpa@zytor.com
> Cc: stable@vger.kernel.org
> Subject: RE: [PATCH 1/1] X86: Mark the Hyper-V clocksource as being
> continuous
> 
> Does this mean that host-to guest timesync now works properly with Linux
> guests?
> 
> -- Jeff

Jeff,

We have had the Hyper-V clocksource for sometime now and this patch just marks this clocksource
as being continuous. Nothing has changed with regards to timesynch.

Regards,

K. Y 

> 
> > -----Original Message-----
> > From: linux-kernel-owner@vger.kernel.org
> [mailto:linux-kernel-owner@vger.kernel.org]
> > On Behalf Of K. Y. Srinivasan
> > Sent: Tuesday, December 2, 2014 17:04
> > To: x86@kernel.org; gregkh@linuxfoundation.org;
> linux-kernel@vger.kernel.org;
> > devel@linuxdriverproject.org; olaf@aepfle.de; apw@canonical.com;
> > jasowang@redhat.com; tglx@linutronix.de; hpa@zytor.com
> > Cc: K. Y. Srinivasan; stable@vger.kernel.org
> > Subject: [PATCH 1/1] X86: Mark the Hyper-V clocksource as being
> continuous
> >
> > The clocksource based on Hyper-V per-partition reference count MSR is
> continuous. Mark
> > it accordingly.
> >
> > Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
> > cc: stable@vger.kernel.org
> > ---
> >  arch/x86/kernel/cpu/mshyperv.c |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> >
> > diff --git a/arch/x86/kernel/cpu/mshyperv.c
> b/arch/x86/kernel/cpu/mshyperv.c index
> > a450373..939155f 100644
> > --- a/arch/x86/kernel/cpu/mshyperv.c
> > +++ b/arch/x86/kernel/cpu/mshyperv.c
> > @@ -107,6 +107,7 @@ static struct clocksource hyperv_cs = {
> >  	.rating		= 400, /* use this when running on Hyperv*/
> >  	.read		= read_hv_clock,
> >  	.mask		= CLOCKSOURCE_MASK(64),
> > +	.flags		= CLOCK_SOURCE_IS_CONTINUOUS,
> >  };
> >
> >  static void __init ms_hyperv_init_platform(void)
> > --
> > 1.7.4.1
> >
> > --
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