From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Dor Laor" Subject: Re: QEMU PIC indirection patch for in-kernel APIC work Date: Wed, 4 Apr 2007 08:47:58 -0700 Message-ID: <64F9B87B6B770947A9F8391472E032160B318E96@ehost011-8.exch011.intermedia.net> References: <4613BF07.50606@qumranet.com> <8FFF7E42E93CC646B632AB40643802A8025B9580@scsmsx412.amr.corp.intel.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org To: "Nakajima, Jun" , "Avi Kivity" , "Anthony Liguori" Return-path: Content-class: urn:content-classes:message In-Reply-To: <8FFF7E42E93CC646B632AB40643802A8025B9580-1a9uaKK1+wJcIJlls4ac1rfspsVTdybXVpNB7YpNyf8@public.gmane.org> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Errors-To: kvm-devel-bounces-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org List-Id: kvm.vger.kernel.org >>> This is for the TPR right? VT has special logic to handle TPR >>> virtualization doesn't it? I thought SVM did too... >>> >> >> Yes, the TPR. Both VT and SVM virtualize CR8 in 64-bit mode. SVM >> also supports CR8 in 32-bit mode through a nwe instruction encoding, >> but >> nobody uses that to my knowledge. Maybe some brave soul can hack kvm >> to patch the new instruction in place of the mmio instruction Windows >> uses >> to bang on the tpr. > >Actually VT has virtual TPR support that does not require CR8. We >submitted a patch for Xen. Please see >http://lists.xensource.com/archives/html/xen-devel/2007-03/msg00993.htm l >The spec should be available soon. We are working on a patch for KVM. > >Jun That's superb! Windows gives us really bad time with all of those TPR accesses. Because of that we currently prefer of using the non-acpi HAL. On what version on chip is this feature supported? This pushes towards in kernel apic too. Can't see how we avoid it. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV