From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:45392) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WXybB-00025w-GK for qemu-devel@nongnu.org; Wed, 09 Apr 2014 15:56:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WXyb5-0007Qk-Bf for qemu-devel@nongnu.org; Wed, 09 Apr 2014 15:55:53 -0400 Received: from mail-qc0-f171.google.com ([209.85.216.171]:33567) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WXyb5-0007QZ-7x for qemu-devel@nongnu.org; Wed, 09 Apr 2014 15:55:47 -0400 Received: by mail-qc0-f171.google.com with SMTP id c9so3319832qcz.2 for ; Wed, 09 Apr 2014 12:55:46 -0700 (PDT) MIME-Version: 1.0 From: Andy Lutomirski Date: Wed, 9 Apr 2014 12:55:26 -0700 Message-ID: Content-Type: text/plain; charset=ISO-8859-1 Subject: [Qemu-devel] Turning off default storage devices? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org Currently, -M q35 boots linux quite a bit slower than the default machine type. This seems to be because it takes a few hundred ms to determine that there's nothing attached to the AHCI controller. In virtio setups, there will probably never be anything attached to the AHCI controller. Would it be possible to add something like -machine default_storage=off to turn off default storage devices? This could include the AHCI on q35 and the cdrom and such on pc. There's precedent: -machine usb=off turns off the default USB controllers, which is great for setups that use xhci. Thanks, Andy