From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Egger, Christoph" Subject: Re: [PATCH 1/3] Nested VMX: update nested paging mode when vmswitch is in progress Date: Mon, 20 Jan 2014 10:07:31 +0100 Message-ID: <52DCE753.1040507@amazon.de> References: <1386814004-5574-1-git-send-email-yang.z.zhang@intel.com> <1386814004-5574-2-git-send-email-yang.z.zhang@intel.com> <52B18213020000780010E98C@nat28.tlf.novell.com> <52B18F89.1070309@amazon.de> <52D4F57F020000780011362C@nat28.tlf.novell.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: Received: from mail6.bemta14.messagelabs.com ([193.109.254.103]) by lists.xen.org with esmtp (Exim 4.72) (envelope-from ) id 1W5Apb-0001l0-Nd for xen-devel@lists.xenproject.org; Mon, 20 Jan 2014 09:07:44 +0000 In-Reply-To: List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xen.org Errors-To: xen-devel-bounces@lists.xen.org To: "Zhang, Yang Z" , Jan Beulich , "Dong, Eddie" Cc: xen-devel List-Id: xen-devel@lists.xenproject.org On 14.01.14 08:38, Zhang, Yang Z wrote: > Jan Beulich wrote on 2014-01-14: >>>>> On 14.01.14 at 03:33, "Zhang, Yang Z" wrote: >>> Zhang, Yang Z wrote on 2013-12-24: >>> >>> Any comments ? >> >> Considering Christoph's comments and reservations, if you can't alone >> deal with this I think you should work with the AMD people to >> eliminate or address his concerns. >> > > Yes. But the problem puzzled me is that Christoph said nested SVM works > well w/o my patch which I cannot understand. Because according my analysis > in previous thread, it also buggy in AMD side. But if they really solved > the issue in their side, I wonder how they fix it. Perhaps I can use the > same solution in VMX side without touch the common code. > > Christoph, can you help to check it? thanks. The fix I mentioned solves the vmswitch problem on AMD side. The page mode problem you discovered is a seperate issue for both SVM and VMX that needs to be addressed. Christoph