From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: [RFT] Fix for unhandled msr c0000081 problems under Intel cpus Date: Thu, 28 Dec 2006 15:58:25 +0100 Message-ID: <20061228145825.GA16057@elte.hu> References: <20061228131445.GA1438@elte.hu> <4593C4CE.4040203@qumranet.com> <20061228132602.GA3392@elte.hu> <20061228134845.GA7446@elte.hu> <4593CD12.7010603@qumranet.com> <20061228140223.GA9418@elte.hu> <4593D011.9020808@qumranet.com> <20061228140836.GB10033@elte.hu> <20061228141242.GA11229@elte.hu> <4593D2D5.3020102@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: kvm-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org Return-path: To: Avi Kivity Content-Disposition: inline In-Reply-To: <4593D2D5.3020102-atKUWr5tajBWk0Htik3J/w@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 * Avi Kivity wrote: > >actually, those MSRs are really architecture-defined for P6 family > >CPUs. So KVM/qemu should at least fake something there, or ignore it. > >These MSRs might be ticked by various existing kernels and > >distributions. Performance counters are ignored at the moment? > > They are unimplemented, and tricky to implement. Just swallowing the > wrmsr is easy, but it won't do the expected thing, whatever that is. the expected thing is to get periodic watchdog NMIs injected - but it's not a big problem if that doesnt work, the watchdog code detects that. Crashing during bootup isnt too sexy though. Ingo ------------------------------------------------------------------------- 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