From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59272) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WB5ue-0000zN-SO for qemu-devel@nongnu.org; Wed, 05 Feb 2014 12:05:30 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1WB5uY-0005lM-TN for qemu-devel@nongnu.org; Wed, 05 Feb 2014 12:05:24 -0500 Received: from mx1.redhat.com ([209.132.183.28]:11781) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1WB5uY-0005lB-Lg for qemu-devel@nongnu.org; Wed, 05 Feb 2014 12:05:18 -0500 Message-ID: <52F26F08.2000300@redhat.com> Date: Wed, 05 Feb 2014 18:04:08 +0100 From: Paolo Bonzini MIME-Version: 1.0 References: <1391549456-465-1-git-send-email-mst@redhat.com> <52F161C6.4070603@redhat.com> <52F26B14.2000807@redhat.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH] pc_piix: enable legacy hotplug for Xen List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Stefano Stabellini Cc: Sander Eikelenboom , qemu-devel@nongnu.org, Anthony Liguori , "Michael S. Tsirkin" Il 05/02/2014 17:54, Stefano Stabellini ha scritto: >> > I'm not sure how this is related to fw_cfg? fw_cfg is just a simple key-value >> > store. If hvmloader doesn't use it, it should be a burden. > I was referring to the fact that QEMU might not have all the info that > need to be written to fw_cfg when running on Xen: some of the info might > be in the hypervisor and some other in another QEMU instance. > Or do you think that fw_cfg could be written by multiple entities > simultaneously? Wouldn't it be possible to fetch the necessary information via hypercalls or in xenstore? It's possible that some particular fw_cfg entries will be skipped for Xen, but most of them should apply. fw_cfg support would also make it possible to use -kernel/-initrd in Xen HVM machines, for example. Paolo