From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751221Ab1LHLfR (ORCPT ); Thu, 8 Dec 2011 06:35:17 -0500 Received: from mx1.redhat.com ([209.132.183.28]:22320 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750715Ab1LHLfL (ORCPT ); Thu, 8 Dec 2011 06:35:11 -0500 Date: Thu, 8 Dec 2011 17:04:22 +0530 From: Amit Shah To: Eric B Munson Cc: avi@redhat.com, mingo@redhat.com, hpa@zytor.com, arnd@arndb.de, ryanh@linux.vnet.ibm.com, aliguori@us.ibm.com, mtosatti@redhat.com, jeremy.fitzhardinge@citrix.com, levinsasha928@gmail.com, Jan Kiszka , kvm@vger.kernel.org, linux-arch@vger.kernel.org, x86@kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 0/5 V5] Avoid soft lockup message when KVM is stopped by host Message-ID: <20111208113422.GA27919@amit-x200.redhat.com> References: <1323116344-17911-1-git-send-email-emunson@mgebm.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1323116344-17911-1-git-send-email-emunson@mgebm.net> User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On (Mon) 05 Dec 2011 [15:18:59], Eric B Munson wrote: > When a guest kernel is stopped by the host hypervisor it can look like a soft > lockup to the guest kernel. This false warning can mask later soft lockup > warnings which may be real. This patch series adds a method for a host > hypervisor to communicate to a guest kernel that it is being stopped. The > final patch in the series has the watchdog check this flag when it goes to > issue a soft lockup warning and skip the warning if the guest knows it was > stopped. Guest S4 would need similar treatment, and I think the code in the two approaches can be shared. Just something to consider. Amit