From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:50148) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fPeS2-0004Ae-RK for qemu-devel@nongnu.org; Sun, 03 Jun 2018 21:38:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fPeRz-0006Ch-P3 for qemu-devel@nongnu.org; Sun, 03 Jun 2018 21:38:26 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:39620 helo=mx1.redhat.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1fPeRz-0006Cd-Ks for qemu-devel@nongnu.org; Sun, 03 Jun 2018 21:38:23 -0400 Date: Mon, 4 Jun 2018 04:38:22 +0300 From: "Michael S. Tsirkin" Message-ID: <20180604042928-mutt-send-email-mst@kernel.org> References: <20180603092749.107476-1-marcel.apfelbaum@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180603092749.107476-1-marcel.apfelbaum@gmail.com> Subject: Re: [Qemu-devel] [PATCH RFC] hw/pc: set q35 as the default x86 machine List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Marcel Apfelbaum Cc: qemu-devel@nongnu.org, pbonzini@redhat.com, ehabkost@redhat.com, rth@twiddle.net On Sun, Jun 03, 2018 at 12:27:49PM +0300, Marcel Apfelbaum wrote: > Moving to QEMU 3.0 seems like a good opportunity for such a change. > > I440FX is really old and does not support modern features like IOMMU. > Q35's SATA emulation is faster than pc's IDE, native PCI express hotplug > is cleaner than ACPI based one and so on... > > Also the libvirt guys added very good support for the Q35 machine (thanks!). > > Management software should always specify the machine type and for the > current setups, adding '-machine pc' to the command line is not such a > big deal. > > In time the pc machine will fade out and we will probably stop adding > new versions at some point. > > Signed-off-by: Marcel Apfelbaum For command line users, I think changing the default isn't nice. Yes it's easy to add -machine pc but there's no documentation that tells you to do so. Add to that shortcuts like -cdrom stop working, hotplug needs extra bridges to work, and one can see that while management tool users benefit from q35, command line users will suffer. Can't we add a tag for management without changing the command line default? How about "management-default"? "recommended"? "latest"? -- MST