From mboxrd@z Thu Jan 1 00:00:00 1970 From: Marcelo Tosatti Subject: Re: [RFC PATCH 0/3] Avoid soft lockup message when KVM is stopped by host Date: Thu, 4 Aug 2011 13:29:02 -0300 Message-ID: <20110804162902.GA27692@amt.cnet> References: <1312381501-27746-1-git-send-email-emunson@mgebm.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: kvm@vger.kernel.org, kvm-ia64@vger.kernel.org, kvm-ppc@vger.kernel.org, avi@redhat.com, riel@redhat.com, glommer@redhat.com, linux-kernel@vger.kernel.org, aliguori@us.ibm.com, raharper@us.ibm.com To: Eric B Munson Return-path: Content-Disposition: inline In-Reply-To: <1312381501-27746-1-git-send-email-emunson@mgebm.net> Sender: kvm-ppc-owner@vger.kernel.org List-Id: kvm.vger.kernel.org On Wed, Aug 03, 2011 at 10:24:58AM -0400, Eric B Munson wrote: > This set is just a rough first pass at avoiding soft lockup warnings when a host > pauses the execution of a guest. A flag is set by the host in the shared page > used for the pvclock when the host goes to stop the guest. When the guest > resumes and detects a soft lockup, this flag is checked and cleared and the soft > lockup message is skipped. > > This currently breaks the build for non-x86 architectures but part of what I am > looking for here is how to go about adding the function stubs for everything > else. To fix this, you can save/restore the offset added to kvmclock on vmstop/vmstart. See hw/kvmclock.c in the qemu source tree.