From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1JV7OI-0003dj-1y for qemu-devel@nongnu.org; Fri, 29 Feb 2008 10:43:18 -0500 Received: from exim by lists.gnu.org with spam-scanned (Exim 4.43) id 1JV7OG-0003Zn-5c for qemu-devel@nongnu.org; Fri, 29 Feb 2008 10:43:17 -0500 Received: from [199.232.76.173] (helo=monty-python.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1JV7OF-0003Zd-VY for qemu-devel@nongnu.org; Fri, 29 Feb 2008 10:43:16 -0500 Received: from os.inf.tu-dresden.de ([141.76.48.99]) by monty-python.gnu.org with esmtps (TLS-1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.60) (envelope-from ) id 1JV7OF-0002v3-GO for qemu-devel@nongnu.org; Fri, 29 Feb 2008 10:43:15 -0500 Received: from erwin.inf.tu-dresden.de ([141.76.48.80] helo=chrom.inf.tu-dresden.de) by os.inf.tu-dresden.de with esmtps (TLSv1:AES256-SHA:256) (Exim 4.69) id 1JV7OE-0001vq-2d for qemu-devel@nongnu.org; Fri, 29 Feb 2008 16:43:14 +0100 Received: from kauer by chrom.inf.tu-dresden.de with local (Exim 4.69) (envelope-from ) id 1JV7OE-0008AE-KZ for qemu-devel@nongnu.org; Fri, 29 Feb 2008 16:43:14 +0100 Date: Fri, 29 Feb 2008 16:43:14 +0100 From: Bernhard Kauer Subject: Re: [Qemu-devel] [PATCH] allow update of MSR_EFER_SVM Message-ID: <20080229154314.GA31173@chrom.inf.tu-dresden.de> References: <20080227160716.GA9305@chrom.inf.tu-dresden.de> <50E1BA25-AC2A-48A2-AFF2-83630AE4BF9E@csgraf.de> <20080229094113.GB9305@chrom.inf.tu-dresden.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Reply-To: qemu-devel@nongnu.org List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org On Fri, Feb 29, 2008 at 11:20:24AM +0100, Alexander Graf wrote: > Keep in mind that updating the bit should fail within a virtual machine. I found the following sentence in the manual: The effect of turning off EFER.SVME while a guest is running is undefined; therefore, the VMM should always prevent guests from writing EFER. Therefore i think the wrmsr-code is just fine, as it is in my patch. Bernhard Kauer