Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753235Ab3IQOye (ORCPT ); Tue, 17 Sep 2013 10:54:34 -0400 Received: from mx1.redhat.com ([209.132.183.28]:28968 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753134Ab3IQOyc (ORCPT ); Tue, 17 Sep 2013 10:54:32 -0400 Date: Tue, 17 Sep 2013 16:59:19 +0300 From: Gleb Natapov To: KY Srinivasan Cc: "H. Peter Anvin" , "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" , "JBeulich@suse.com" , "bp@alien8.de" Subject: Re: [PATCH V2 1/1] X86: Hyper-V: Get the local APIC timer frequency from the hypervisor Message-ID: <20130917135918.GY17294@redhat.com> References: <1378233023-4512-1-git-send-email-kys@microsoft.com> <52325C1E.90101@zytor.com> <50f92d9c16a54e5bb6fa14ef72e5fdfb@SN2PR03MB061.namprd03.prod.outlook.com> <20130913095526.GE18381@redhat.com> <7737cb643a664b6fb39021b4d364b5cf@SN2PR03MB061.namprd03.prod.outlook.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7737cb643a664b6fb39021b4d364b5cf@SN2PR03MB061.namprd03.prod.outlook.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2479 Lines: 63 On Fri, Sep 13, 2013 at 02:28:35PM +0000, KY Srinivasan wrote: > > > > -----Original Message----- > > From: Gleb Natapov [mailto:gleb@redhat.com] > > Sent: Friday, September 13, 2013 2:55 AM > > To: KY Srinivasan > > Cc: H. Peter Anvin; 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; > > JBeulich@suse.com; bp@alien8.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@zytor.com] > > > > Sent: Thursday, September 12, 2013 5:28 PM > > > > To: KY Srinivasan > > > > Cc: 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; JBeulich@suse.com; > > bp@alien8.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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/