From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jan Kiszka Subject: Re: Can VMX provide real mode support? Date: Wed, 21 Mar 2012 14:40:46 +0100 Message-ID: <4F69DA5E.6010505@siemens.com> References: Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: "qemu-devel@nongnu.org" , kvm To: GaoYi Return-path: Received: from thoth.sbs.de ([192.35.17.2]:20493 "EHLO thoth.sbs.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752069Ab2CUNku (ORCPT ); Wed, 21 Mar 2012 09:40:50 -0400 In-Reply-To: Sender: kvm-owner@vger.kernel.org List-ID: 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. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:40811) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SALmV-0002Qz-A6 for qemu-devel@nongnu.org; Wed, 21 Mar 2012 09:41:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SALmT-0006ld-Hg for qemu-devel@nongnu.org; Wed, 21 Mar 2012 09:40:50 -0400 Received: from thoth.sbs.de ([192.35.17.2]:15650) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SALmT-0006lV-82 for qemu-devel@nongnu.org; Wed, 21 Mar 2012 09:40:49 -0400 Message-ID: <4F69DA5E.6010505@siemens.com> Date: Wed, 21 Mar 2012 14:40:46 +0100 From: Jan Kiszka MIME-Version: 1.0 References: In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] Can VMX provide real mode support? List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: GaoYi Cc: "qemu-devel@nongnu.org" , kvm 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. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux