From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=48255 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1Q0E95-000828-OX for qemu-devel@nongnu.org; Thu, 17 Mar 2011 10:25:49 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Q0E94-0001Qf-LY for qemu-devel@nongnu.org; Thu, 17 Mar 2011 10:25:47 -0400 Received: from mx2.isti.cnr.it ([194.119.192.4]:2793) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Q0E94-0001Pl-Ga for qemu-devel@nongnu.org; Thu, 17 Mar 2011 10:25:46 -0400 Received: from SCRIPT-SPFWL-DAEMON.mx.isti.cnr.it by mx.isti.cnr.it (PMDF V6.5-x5 #31825) id <01NZ0VY3G57KQKFW8V@mx.isti.cnr.it> for qemu-devel@nongnu.org; Thu, 17 Mar 2011 15:24:41 +0100 (MET) Received: from conversionlocal.isti.cnr.it by mx.isti.cnr.it (PMDF V6.5-x5 #31825) id <01NZ0VY30GSGQKFWAB@mx.isti.cnr.it> for qemu-devel@nongnu.org; Thu, 17 Mar 2011 15:24:38 +0100 (MET) Date: Thu, 17 Mar 2011 15:24:31 +0100 From: Virtbie Message-id: <4D82199F.6030703@shiftmail.org> MIME-version: 1.0 Content-type: text/plain; charset=UTF-8 Content-transfer-encoding: 7bit Subject: [Qemu-devel] Clock skew after pausing guests List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, "'KVM-ML (kvm@vger.kernel.org)'" Hello all I am seeing, perhaps unsurprisingly, a skewed system clock after pausing and then resuming a qemu-kvm guest. The guest continues with its earlier time. Since I'd like to use the pause technique for backups, which can take 1 hour, this is significant. This is with windows guests, and it doesn't seem to recover by itself just by waiting. Linux guests instead seem to adjust their clock correctly after the resume. Is there any way to tell the windows guests to resynchronize its clock with the host? I am using virsh / libvirt. Thank you