From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeremy Fitzhardinge Subject: Re: Re: Xen: Hybrid extension patchset for hypervisor Date: Fri, 18 Sep 2009 17:28:34 -0700 Message-ID: <4AB425B2.400@goop.org> References: <0B53E02A2965CE4F9ADB38B34501A3A1940C78A8@orsmsx505.amr.corp.intel.com> <4AB12C1F.9080502@goop.org> <1253135571.3896.4873.camel@localhost.localdomain> <4AB15707.20305@goop.org> <1253178985.16152.26.camel@zakaz.uk.xensource.com> <0B53E02A2965CE4F9ADB38B34501A3A1940C840B@orsmsx505.amr.corp.intel.com> <4AB2733B.6060804@goop.org> <0B53E02A2965CE4F9ADB38B34501A3A19411EAE7@orsmsx505.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <0B53E02A2965CE4F9ADB38B34501A3A19411EAE7@orsmsx505.amr.corp.intel.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: "Nakajima, Jun" Cc: Ian Campbell , "Yang, Sheng" , "xen-devel@lists.xensource.com" , "Dong, Eddie" , Keir Fraser List-Id: xen-devel@lists.xenproject.org On 09/18/09 17:17, Nakajima, Jun wrote: > Even if we start from PV kernels, I think what we should do is to implement ability (as "incremental changes") for PV guests to stop using PV MMU (and PV CPU) at boot time depending on the H/W features available rather than to keep using the same ABI, because we may not need them in the near future. Then, such PV kernels would be at par or faster/more efficient than pure HVM guests on machines with HAP enabled because of the other PV features. > Sure, that's no problem. So long as the current ABI keeps working, we can easily switch to something else more appropriate where possible. J