From mboxrd@z Thu Jan 1 00:00:00 1970 From: Kashyap Chamarthy Subject: Re: [fedora-virt] 3.13 - Nested KVM (vmx) totally broken? Date: Tue, 4 Mar 2014 15:00:22 +0530 Message-ID: <20140304093022.GG13520@tesla.redhat.com> References: <53158B34.3050909@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Ian Pilcher , virt@lists.fedoraproject.org, kvm@vger.kernel.org To: Paolo Bonzini Return-path: Received: from mx1.redhat.com ([209.132.183.28]:31785 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756462AbaCDJbh (ORCPT ); Tue, 4 Mar 2014 04:31:37 -0500 Content-Disposition: inline In-Reply-To: <53158B34.3050909@redhat.com> Sender: kvm-owner@vger.kernel.org List-ID: On Tue, Mar 04, 2014 at 09:13:40AM +0100, Paolo Bonzini wrote: > Il 04/03/2014 03:40, Ian Pilcher ha scritto: > >Is this a known problem? I just tried using nested vmx for the first > >time since upgrading my system from F19 (3.12.?? at the time) to F20, > >and I cannot start any L2 guests. The L2 guest appears to hang almost > >immediately after starting, consuming 100% of one of the L1 guest's > >VCPUs. > > > >If I reboot with kernel-3.12.10-300.fc20.x86_64, the problem does not > >occur. > > > >Any known workaround? (Other than using 3.12.10?) If you want to try, I made a Fedora Kernel scratch build (i.e. not official) with fix Paolo pointed to below and this works for me: http://koji.fedoraproject.org/koji/taskinfo?taskID=6577700 (NOTE: Fedora Scratch build URLs won't last more than 10 days or so) > > There is a fix on the way to the 3.13 kernel. > > You can open a Fedora bug and ask them to include > http://article.gmane.org/gmane.linux.kernel.stable/82043/raw in the > kernel. > > Paolo > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html -- /kashyap