linux-kernel - Re: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency from the hypervisor

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Date:	Tue, 17 Sep 2013 16:59:19 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	"H. Peter Anvin" <hpa@...or.com>,
	"x86@...nel.org" <x86@...nel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"olaf@...fle.de" <olaf@...fle.de>,
	"apw@...onical.com" <apw@...onical.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"JBeulich@...e.com" <JBeulich@...e.com>,
	"bp@...en8.de" <bp@...en8.de>
Subject: Re: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency
 from the hypervisor

On Fri, Sep 13, 2013 at 02:28:35PM +0000, KY Srinivasan wrote:
> 
> 
> > -----Original Message-----
> > From: Gleb Natapov [mailto:gleb@...hat.com]
> > Sent: Friday, September 13, 2013 2:55 AM
> > To: KY Srinivasan
> > Cc: H. Peter Anvin; x86@...nel.org; gregkh@...uxfoundation.org; linux-
> > kernel@...r.kernel.org; devel@...uxdriverproject.org; olaf@...fle.de;
> > apw@...onical.com; jasowang@...hat.com; tglx@...utronix.de;
> > JBeulich@...e.com; bp@...en8.de
> > Subject: Re: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency
> > from the hypervisor
> > 
> > On Fri, Sep 13, 2013 at 01:43:09AM +0000, KY Srinivasan wrote:
> > >
> > >
> > > > -----Original Message-----
> > > > From: H. Peter Anvin [mailto:hpa@...or.com]
> > > > Sent: Thursday, September 12, 2013 5:28 PM
> > > > To: KY Srinivasan
> > > > Cc: x86@...nel.org; gregkh@...uxfoundation.org; linux-
> > kernel@...r.kernel.org;
> > > > devel@...uxdriverproject.org; olaf@...fle.de; apw@...onical.com;
> > > > jasowang@...hat.com; tglx@...utronix.de; JBeulich@...e.com;
> > bp@...en8.de
> > > > Subject: Re: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency
> > > > from the hypervisor
> > > >
> > > > On 09/12/2013 05:06 PM, KY Srinivasan wrote:
> > > > >
> > > > > Peter,
> > > > >
> > > > > Let me know if you want me to address any additional issues in this patch.
> > > > >
> > > >
> > > > Please address Jan and Gleb's feedback.
> > >
> > > Gleb's feedback was a question and I answered that as I did Jan's feedback as
> > well.
> > > Gleb, Jan, please let me know if there is something else you want addressed
> > here.
> > >
> > No, I am just interesting to know some details about the interface since
> > I cannot find it documented in Hyper-V spec.
> 
> Thanks Gleb. Here is the link for the latest Hyper-V specification:
> http://www.microsoft.com/en-us/download/details.aspx?id=39289
> 
> This spec talks about how migration is handled with regards to TSC.
> 
All I can see is "15.4.3 Partition Reference TSC Mechanism". I see
nothing about HV_X64_MSR_TSC_FREQUENCY specifically. To access this MSR
a partition needs AccessFrequencyMsrs privilege, may be partition that
cab be migrated does not have this privilege?

--
			Gleb.
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