From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: Graphics pass-through Date: Wed, 11 May 2011 15:08:54 +0200 Message-ID: <4DCA8A66.4080304@siemens.com> References: <4D415D70.8070105@web.de> <1296175554.2891.29.camel@x201> <4DC264CD.9080700@siemens.com> <1304608642.3081.35.camel@x201> <4DC7CCB3.8030607@siemens.com> <4DC807E3.4080706@siemens.com> <1304956091.26106.39.camel@x201> <4DCA7217.5020806@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: Alex Williamson , Prasad Joshi , =?UTF-8?B?QW5kcsOpIFdlaWRlbWFubg==?= , "kvm@vger.kernel.org" , Oswaldo Cadenas , "Nikolaev, Maxim" To: Avi Kivity Return-path: Received: from goliath.siemens.de ([192.35.17.28]:22669 "EHLO goliath.siemens.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755386Ab1EKPzR (ORCPT ); Wed, 11 May 2011 11:55:17 -0400 In-Reply-To: <4DCA7217.5020806@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On 2011-05-11 13:25, Avi Kivity wrote: > On 05/09/2011 06:48 PM, Alex Williamson wrote: >>> That's an interesting trace! We'll check this here, but I bet it >>> contributes to the problems. Our FX 3800 has 1G memory... >> >> Yes, qemu leaves far too little MMIO space to think about assigning >> graphics cards. Both of my cards have 512MB and I hacked qemu to leave >> a bigger gap via something like: >> > > What about 64-bit BARs? Aren't they backward compatible? Or do you think some guest drivers may assume to find their 64-bit capable bars also registered as such and get upset when seeing them as 32-bit ones? Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux