From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:57161) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WsamY-0002Bj-Gd for qemu-devel@nongnu.org; Thu, 05 Jun 2014 12:44:56 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WsamB-0001n1-KC for qemu-devel@nongnu.org; Thu, 05 Jun 2014 12:44:50 -0400 Received: from mx1.redhat.com ([209.132.183.28]:26393) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WsamB-0001mq-Cn for qemu-devel@nongnu.org; Thu, 05 Jun 2014 12:44:27 -0400 Message-ID: <53909E53.9050300@redhat.com> Date: Thu, 05 Jun 2014 18:44:03 +0200 From: Paolo Bonzini MIME-Version: 1.0 References: <1401984741-26882-1-git-send-email-ehabkost@redhat.com> <539099B6.2090000@suse.de> <53909A41.1060800@redhat.com> <53909D79.1070609@suse.de> In-Reply-To: <53909D79.1070609@suse.de> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC 0/2] GET_EMULATED_CPUID support with "allow-emulation" option List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Alexander Graf , Eduardo Habkost , qemu-devel@nongnu.org Cc: Michael Mueller , kvm@vger.kernel.org, "Michael S. Tsirkin" , Christian Borntraeger , "Gabriel L. Somlo" , Borislav Petkov , "Jason J. Herne" , =?UTF-8?B?QW5kcmVhcyBGw6RyYmVy?= Il 05/06/2014 18:40, Alexander Graf ha scritto: > > > kvm_set_cpuid(cpuid); > > but enabling all experimental features inside KVM just because we want > one or two of them is very counter-intuitive. Imagine we'd introduce > emulation support for AVX. Suddenly allow-emulation (which I'd need for > Mac OS X 10.5) would enable AVX as well which I really don't want enabled. Only if you were using "-cpu somethingThatHasAVX", though, no? Paolo