From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from [140.186.70.92] (port=32776 helo=eggs.gnu.org) by lists.gnu.org with esmtp (Exim 4.43) id 1P8CFa-0000Lf-Gu for qemu-devel@nongnu.org; Tue, 19 Oct 2010 09:29:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1P8CFQ-0003jT-9W for qemu-devel@nongnu.org; Tue, 19 Oct 2010 09:29:10 -0400 Received: from mail-vw0-f45.google.com ([209.85.212.45]:33510) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1P8CFQ-0003jH-6X for qemu-devel@nongnu.org; Tue, 19 Oct 2010 09:29:00 -0400 Received: by vws11 with SMTP id 11so1396248vws.4 for ; Tue, 19 Oct 2010 06:28:59 -0700 (PDT) Message-ID: <4CBD9D17.2080802@codemonkey.ws> Date: Tue, 19 Oct 2010 08:28:55 -0500 From: Anthony Liguori MIME-Version: 1.0 Subject: Re: [Qemu-devel] Re: KVM call agenda for Oct 19 References: <20101019021117.GI25455@sequoia.sous-sol.org> <4CBD93B8.9070002@redhat.com> In-Reply-To: <4CBD93B8.9070002@redhat.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit List-Id: qemu-devel.nongnu.org List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: dlaor@redhat.com Cc: chrisw@redhat.com, kvm@vger.kernel.org, Juan Quintela , qemu-devel@nongnu.org, Chris Wright , Ayal Baron , Alon Levy , "Venkateswararao Jujjuri (JV)" On 10/19/2010 07:48 AM, Dor Laor wrote: > On 10/19/2010 04:11 AM, Chris Wright wrote: >> * Juan Quintela (quintela@redhat.com) wrote: >>> >>> Please send in any agenda items you are interested in covering. >> >> - 0.13.X -stable handoff >> - 0.14 planning >> - threadlet work >> - virtfs proposals >> > > - Live snapshots > - We were asked to add this feature for external qcow2 > images. Will simple approach of fsync + tracking each requested > backing file (it can be per vDisk) and re-open the new image would > be accepted? > - Integration with FS freeze for consistent guest app snapshot > Many apps do not sync their ram state to disk correctly or frequent > enough. Physical world backup software calls fs freeze on xfs and > VSS for windows to make the backup consistent. > In order to integrated this with live snapshots we need a guest > agent to trigger the guest fs freeze. > We can either have qemu communicate with the agent directly through > virtio-serial or have a mgmt daemon use virtio-serial to > communicate with the guest in addition to QMP messages about the > live snapshot state. > Preferences? The first solution complicates qemu while the second > complicates mgmt. - usb-ccid (aka external device modules) We probably won't get to it for today's call, but we should try to queue this topic up for discussion. We have a similar situation with vtpm (existing device model that wants to integrate with QEMU). My position so far has been that we should avoid external device models because of difficulty integrating QEMU features with external device models. However, I'd like to hear opinions from a wider audience. Regards, Anthony Liguori > -- > 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