From mboxrd@z Thu Jan 1 00:00:00 1970 From: Samuel Thibault Subject: Re: vmcs_revision_id: do we care? Date: Wed, 9 Jan 2008 16:18:16 +0000 Message-ID: <20080109161816.GB4214@implementation.uk.xensource.com> References: <4784F2BC.5020504@virtualiron.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Return-path: Content-Disposition: inline In-Reply-To: <4784F2BC.5020504@virtualiron.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Daniel Li Cc: xen-devel@lists.xensource.com List-Id: xen-devel@lists.xenproject.org Daniel Li, le Wed 09 Jan 2008 11:13:48 -0500, a écrit : > Based on what I've heard, both IBM and Intel have been telling people > this configuration is valid. From what I was able to dig out, Intel in > their System Programming Guide: Virtual Machine Monitor Programming > Considerations, published Nov. 2007, suggested when loading a VMCS onto > a processor with a different vmcs_revision_id, instead of using VMPTRLD, > one should use VMREAD to read out each field then use VMWRITE to write > them back. Which would mean quite some burden, even if valid... Buying a machine that may require such slowdown is a no-go for me :) Samuel