From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luiz Capitulino Subject: Re: [Qemu-devel] Can VMX provide real mode support? Date: Fri, 23 Mar 2012 14:58:17 -0300 Message-ID: <20120323145817.11e8101c@doriath.home> References: <4F69DA5E.6010505@siemens.com> <4F69DC3B.3050509@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Jan Kiszka , GaoYi , "qemu-devel@nongnu.org" , kvm To: Avi Kivity Return-path: Received: from mx1.redhat.com ([209.132.183.28]:30879 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756597Ab2CWR6S (ORCPT ); Fri, 23 Mar 2012 13:58:18 -0400 In-Reply-To: <4F69DC3B.3050509@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: 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?