From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [Qemu-devel] Can VMX provide real mode support? Date: Sun, 25 Mar 2012 11:55:18 +0200 Message-ID: <4F6EEB86.9060507@redhat.com> References: <4F69DA5E.6010505@siemens.com> <4F69DC3B.3050509@redhat.com> <20120323145817.11e8101c@doriath.home> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: Jan Kiszka , GaoYi , "qemu-devel@nongnu.org" , kvm To: Luiz Capitulino Return-path: Received: from mx1.redhat.com ([209.132.183.28]:34896 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755286Ab2CYJz0 (ORCPT ); Sun, 25 Mar 2012 05:55:26 -0400 In-Reply-To: <20120323145817.11e8101c@doriath.home> Sender: kvm-owner@vger.kernel.org List-ID: On 03/23/2012 07:58 PM, Luiz Capitulino wrote: > On Wed, 21 Mar 2012 15:48:43 +0200 > Avi Kivity wrote: > > > On 03/21/2012 03:40 PM, Jan Kiszka wrote: > > > On 2012-03-21 13:38, GaoYi wrote: > > > > Hi Jan, > > > > > > > > Since the newest Intel-VT supports the guest OS under the real mode, which was already supported in AMD-V, can the VMX in the latest KVM support that case? > > > > > > Yes, both with our without that "unrestricted guest" support (as Intel > > > called it), real mode will generally work. Without that CPU feature, I > > > think to recall that there were some limitations for big real mode, not > > > sure. > > > > > > > Yes, big real mode will not work without "unrestricted guest". There > > was some work to emulate it (module option emulate_invalid_guest_state), > > but it is not complete. > > Can you provide a pointer for this? series? It's merged (look for emulate_invalid_guest_state in vmx.c), just incomplete. -- error compiling committee.c: too many arguments to function