From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:52857) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WYGkq-0004ZQ-Hi for qemu-devel@nongnu.org; Thu, 10 Apr 2014 11:19:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WYGki-0000Cs-KS for qemu-devel@nongnu.org; Thu, 10 Apr 2014 11:19:04 -0400 Received: from mail-pd0-f173.google.com ([209.85.192.173]:50698) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WYGki-0000Cb-F8 for qemu-devel@nongnu.org; Thu, 10 Apr 2014 11:18:56 -0400 Received: by mail-pd0-f173.google.com with SMTP id z10so4003076pdj.4 for ; Thu, 10 Apr 2014 08:18:55 -0700 (PDT) Message-ID: <5346B659.3090808@ozlabs.ru> Date: Fri, 11 Apr 2014 01:18:49 +1000 From: Alexey Kardashevskiy MIME-Version: 1.0 References: <1394770689-29039-1-git-send-email-aik@ozlabs.ru> <1394770689-29039-2-git-send-email-aik@ozlabs.ru> <53469153.9090309@suse.de> <5346AD73.9040506@ozlabs.ru> <5346B049.2040709@suse.de> In-Reply-To: <5346B049.2040709@suse.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Subject: Re: [Qemu-devel] [PATCH 1/8] spapr-iommu: add a bus for spapr-iommu devices List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: =?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?= Cc: Paolo Bonzini , Juan Quintela , qemu-ppc@nongnu.org, Alexander Graf , qemu-devel@nongnu.org On 04/11/2014 12:52 AM, Andreas Färber wrote: > Am 10.04.2014 16:40, schrieb Alexey Kardashevskiy: >> On 04/10/2014 10:40 PM, Alexander Graf wrote: >>> >>> Juan, is a different command line device order supposed to work with >>> migration? >> >> >> We discussed this on IRC with Paolo and the conclusion is that yes, the >> order should not matter. > > Huh?! If you ever tried changing the order of PCI devices such as > virtio-blk-pci on the command line (or changing between if=virtio and > -device virtio-blk-pci) then surely it does change the order of the > /dev/vdX the guest sees and will be migration-incompatible. The order of > -drive and -device however, for instance, does not seem to matter. But > in this generality, your statement does not seem to reflect current reality. As far as I can tell libvirt is trying to be precise and specifies PCI bus name and PCI address for PCI devices. -- Alexey