From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mailman by lists.gnu.org with tmda-scanned (Exim 4.43) id 1O5IsJ-0002Y1-0o for qemu-devel@nongnu.org; Fri, 23 Apr 2010 09:24:55 -0400 Received: from [140.186.70.92] (port=38390 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1O5IsH-0002XZ-KP for qemu-devel@nongnu.org; Fri, 23 Apr 2010 09:24:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.69) (envelope-from ) id 1O5IsF-0001li-O0 for qemu-devel@nongnu.org; Fri, 23 Apr 2010 09:24:53 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45041) by eggs.gnu.org with esmtp (Exim 4.69) (envelope-from ) id 1O5IsF-0001lZ-FM for qemu-devel@nongnu.org; Fri, 23 Apr 2010 09:24:51 -0400 Message-ID: <4BD19F9C.2000102@redhat.com> Date: Fri, 23 Apr 2010 16:24:44 +0300 From: Avi Kivity MIME-Version: 1.0 References: <1271829445-5328-1-git-send-email-tamura.yoshiaki@lab.ntt.co.jp> In-Reply-To: <1271829445-5328-1-git-send-email-tamura.yoshiaki@lab.ntt.co.jp> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: [Qemu-devel] Re: [RFC PATCH 00/20] Kemari for KVM v0.1 List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Yoshiaki Tamura Cc: aliguori@us.ibm.com, kvm@vger.kernel.org, ohmura.kei@lab.ntt.co.jp, mtosatti@redhat.com, qemu-devel@nongnu.org, yoshikawa.takuya@oss.ntt.co.jp On 04/21/2010 08:57 AM, Yoshiaki Tamura wrote: > Kemari starts synchronizing VMs when QEMU handles I/O requests. > Without this patch VCPU state is already proceeded before > synchronization, and after failover to the VM on the receiver, it > hangs because of this. > We discussed moving the barrier to the actual output device, instead of the I/O port. This allows you to complete the I/O transaction before starting synchronization. Does it not work for some reason? -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.