From mboxrd@z Thu Jan 1 00:00:00 1970 From: Muli Ben-Yehuda Subject: Re: VT-d support for device assignment Date: Fri, 22 Aug 2008 21:29:48 +0300 Message-ID: <20080822182948.GJ6885@il.ibm.com> References: <1219389054-15332-1-git-send-email-amit.shah@qumranet.com> <200808222102.33596.amit.shah@qumranet.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Byron Stanoszek , kvm@vger.kernel.org To: Amit Shah Return-path: Received: from mtagate4.uk.ibm.com ([195.212.29.137]:49812 "EHLO mtagate4.uk.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751034AbYHVS37 (ORCPT ); Fri, 22 Aug 2008 14:29:59 -0400 Received: from d06nrmr1407.portsmouth.uk.ibm.com (d06nrmr1407.portsmouth.uk.ibm.com [9.149.38.185]) by mtagate4.uk.ibm.com (8.13.8/8.13.8) with ESMTP id m7MITs4G292876 for ; Fri, 22 Aug 2008 18:29:54 GMT Received: from d06av04.portsmouth.uk.ibm.com (d06av04.portsmouth.uk.ibm.com [9.149.37.216]) by d06nrmr1407.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v9.0) with ESMTP id m7MITspO2576488 for ; Fri, 22 Aug 2008 19:29:54 +0100 Received: from d06av04.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av04.portsmouth.uk.ibm.com (8.12.11.20060308/8.13.3) with ESMTP id m7MITrdo031473 for ; Fri, 22 Aug 2008 19:29:53 +0100 Content-Disposition: inline In-Reply-To: <200808222102.33596.amit.shah@qumranet.com> Sender: kvm-owner@vger.kernel.org List-ID: On Fri, Aug 22, 2008 at 09:02:33PM +0530, Amit Shah wrote: > All the PCI accesses happen from the userspace components in qemu; > it's certainly possible to log activity. Actually, with direct-mmio we bypass QEMU and get a nice boost in performance, and it should be possible to bypass QEMU for (most) PIO's too. Cheers, Muli -- Workshop on I/O Virtualization (WIOV '08) Co-located with OSDI '08, Dec 2008, San Diego, CA http://www.usenix.org/wiov08