From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751793Ab3AYUFv (ORCPT ); Fri, 25 Jan 2013 15:05:51 -0500 Received: from na01-by2-obe.ptr.protection.outlook.com ([207.46.100.23]:43249 "EHLO na01-by2-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751067Ab3AYUFs (ORCPT ); Fri, 25 Jan 2013 15:05:48 -0500 X-Forefront-Antispam-Report-Untrusted: CIP:157.56.240.21;KIP:(null);UIP:(null);(null);H:BL2PRD0310HT003.namprd03.prod.outlook.com;R:internal;EFV:INT X-SpamScore: -2 X-BigFish: PS-2(zz98dI9371I542I1432Izz1ee6h1de0h1202h1e76h1d1ah1d2ahzzz31h2a8h668h839h93fhd24hf0ah1288h12a5h12a9h12bdh137ah13b6h1441h1504h1537h153bh162dh1631h1758h18e1h9a9j1155h) X-Forefront-Antispam-Report-Untrusted: SFV:SKI;SFS:;DIR:OUT;SFP:;SCL:-1;SRVR:SN2PR03MB064;H:SN2PR03MB061.namprd03.prod.outlook.com;LANG:en; From: KY Srinivasan To: Olaf Hering CC: "linux-kernel@vger.kernel.org" , Greg KH , "Jan Beulich (JBeulich@suse.com)" Subject: RE: [PATCH] x86: Hyper-V: register clocksource only if its advertised Thread-Topic: [PATCH] x86: Hyper-V: register clocksource only if its advertised Thread-Index: AQHN+wFSTQzC7+pzaUi0ZNGfsVWqjphaPkYAgAAFEACAAACuUIAABjaAgAACDmCAACrSAIAAAGhw Date: Fri, 25 Jan 2013 20:03:46 +0000 Message-ID: <2f4f2b37780440a99bb75a33efc3f3c6@SN2PR03MB061.namprd03.prod.outlook.com> References: <1359121036-16309-1-git-send-email-olaf@aepfle.de> <761b736ff1854810bfe272961248e6d2@BLUPR03MB050.namprd03.prod.outlook.com> <20130125165443.GA15833@aepfle.de> <500ca90f5d3e4d4f80c7fb62c34d36f0@BLUPR03MB050.namprd03.prod.outlook.com> <20130125171923.GA19306@aepfle.de> <542f1d12e3ee46f48a85a143361c113d@SN2PR03MB061.namprd03.prod.outlook.com> <20130125200000.GA9712@aepfle.de> In-Reply-To: <20130125200000.GA9712@aepfle.de> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [66.235.28.166] Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 X-OrganizationHeadersPreserved: SN2PR03MB064.namprd03.prod.outlook.com X-FOPE-CONNECTOR: Id%0$Dn%*$RO%0$TLS%0$FQDN%$TlsDn% X-FOPE-CONNECTOR: Id%59$Dn%LINUXFOUNDATION.ORG$RO%2$TLS%6$FQDN%131.107.125.5$TlsDn% X-FOPE-CONNECTOR: Id%59$Dn%SUSE.COM$RO%2$TLS%6$FQDN%131.107.125.5$TlsDn% X-FOPE-CONNECTOR: Id%59$Dn%AEPFLE.DE$RO%2$TLS%6$FQDN%131.107.125.5$TlsDn% X-FOPE-CONNECTOR: Id%59$Dn%VGER.KERNEL.ORG$RO%2$TLS%6$FQDN%131.107.125.5$TlsDn% X-CrossPremisesHeadersPromoted: TK5EX14MLTC102.redmond.corp.microsoft.com X-CrossPremisesHeadersFiltered: TK5EX14MLTC102.redmond.corp.microsoft.com X-Forefront-Antispam-Report: CIP:131.107.125.37;CTRY:US;IPV:CAL;IPV:NLI;EFV:NLI;SFV:NSPM;SFS:(13464002)(51704002)(189002)(199002)(24454001)(377454001)(4396001)(50986001)(51856001)(53806001)(6806001)(54316002)(49866001)(16676001)(47736001)(47976001)(44976002)(79102001)(46102001)(76482001)(56816002)(77982001)(59766001)(31966008)(63696002)(56776001)(23676001)(50466001)(20776003)(74502001)(54356001)(74662001)(33646001)(47776003)(47446002)(57646002)(24736002);DIR:OUT;SFP:;SCL:1;SRVR:BL2FFO11HUB014;H:TK5EX14MLTC102.redmond.corp.microsoft.com;RD:;MX:3;A:1;LANG:en; X-OriginatorOrg: microsoft.onmicrosoft.com X-Forefront-PRVS: 0737B96801 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Transfer-Encoding: 8bit X-MIME-Autoconverted: from base64 to 8bit by mail.home.local id r0PK5qAc022836 > -----Original Message----- > From: Olaf Hering [mailto:olaf@aepfle.de] > Sent: Friday, January 25, 2013 3:00 PM > To: KY Srinivasan > Cc: linux-kernel@vger.kernel.org; Greg KH; Jan Beulich (JBeulich@suse.com) > Subject: Re: [PATCH] x86: Hyper-V: register clocksource only if its advertised > > On Fri, Jan 25, KY Srinivasan wrote: > > > Your current approach of using the "Partition Reference Counter" > > feature bit is very fragile. Let us assume that future Windows guests > > depend on this feature; Xen would certainly emulate this to have a > > "good" emulation of Hyper-V and we are back to square one. > > If Xen starts to emulate the "Partition Reference Counter" feature, > wouldnt it also advertise this feature? Yes; it has to - if it expects the Windows guests to use it. This would be no different than the other features that Xen emulates and advertises. K. Y {.n++%ݶw{.n+{G{ayʇڙ,jfhz_(階ݢj"mG?&~iOzv^m ?I