From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:41909) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SCPs6-0002Ul-JM for qemu-devel@nongnu.org; Tue, 27 Mar 2012 02:27:11 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SCPs4-0000qE-UO for qemu-devel@nongnu.org; Tue, 27 Mar 2012 02:27:10 -0400 Received: from mx1.redhat.com ([209.132.183.28]:60154) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SCPs4-0000px-MT for qemu-devel@nongnu.org; Tue, 27 Mar 2012 02:27:08 -0400 Date: Tue, 27 Mar 2012 08:27:16 +0200 From: "Michael S. Tsirkin" Message-ID: <20120327062715.GA3613@redhat.com> References: <20120316085237.4947.53556.stgit@amd-6168-8-1.englab.nay.redhat.com> <4F70E947.3090104@codemonkey.ws> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4F70E947.3090104@codemonkey.ws> Subject: Re: [Qemu-devel] [V5 PATCH 0/4] Send gratuitous packets by guest List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: aliguori@us.ibm.com, stefanha@linux.vnet.ibm.com, quintela@redhat.com, Jason Wang , rusty@rustcorp.com.au, qemu-devel@nongnu.org, pbonzini@redhat.com On Mon, Mar 26, 2012 at 05:10:15PM -0500, Anthony Liguori wrote: > On 03/16/2012 03:54 AM, Jason Wang wrote: > >This an update of series that let guest and qemu to be co-operated to > >send gratuitous packets when needed such as after migration, loadvm > >and continuing. > > > >As it's hard for qemu to track the network configuration in guest such > >as bondings, vlans or ipv6. So current gratuitous may not work under > >those situations. > > Can you be more specific about the failure scenarios? > > Does this mean that migration cannot work today with guests using > ipv6? I don't think just pushing this to the guest is an acceptable > solution in the short term. > > Are there scenarios we cannot handle no matter what in the host? Consider a nested virt scenario. It seems clear that you either must notify the guest about migration, or learn nested guest macs. > Does this mean that for emulated drivers, we're completely out of > luck? > > Regards, > > Anthony Liguori For these, I think we can cause announcements by sending link up event to the guest. -- MST