From mboxrd@z Thu Jan 1 00:00:00 1970 Received: by 10.25.208.211 with SMTP id h202csp1372294lfg; Mon, 22 Feb 2016 12:12:56 -0800 (PST) X-Received: by 10.140.221.16 with SMTP id r16mr9548925qhb.67.1456171976441; Mon, 22 Feb 2016 12:12:56 -0800 (PST) Return-Path: Received: from lists.gnu.org (lists.gnu.org. [2001:4830:134:3::11]) by mx.google.com with ESMTPS id e5si30983369qkb.92.2016.02.22.12.12.56 for (version=TLS1 cipher=AES128-SHA bits=128/128); Mon, 22 Feb 2016 12:12:56 -0800 (PST) Received-SPF: pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) client-ip=2001:4830:134:3::11; Authentication-Results: mx.google.com; spf=pass (google.com: domain of qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org designates 2001:4830:134:3::11 as permitted sender) smtp.mailfrom=qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Received: from localhost ([::1]:51676 helo=lists.gnu.org) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXwql-00083I-Lk for alex.bennee@linaro.org; Mon, 22 Feb 2016 15:12:55 -0500 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38416) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXwqj-00082w-HJ for qemu-arm@nongnu.org; Mon, 22 Feb 2016 15:12:54 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1aXwqg-0005cV-CR for qemu-arm@nongnu.org; Mon, 22 Feb 2016 15:12:53 -0500 Received: from mx1.redhat.com ([209.132.183.28]:54130) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1aXwqg-0005cO-6Q; Mon, 22 Feb 2016 15:12:50 -0500 Received: from int-mx13.intmail.prod.int.phx2.redhat.com (int-mx13.intmail.prod.int.phx2.redhat.com [10.5.11.26]) by mx1.redhat.com (Postfix) with ESMTPS id 9117D746; Mon, 22 Feb 2016 20:12:49 +0000 (UTC) Received: from redhat.com (vpn1-6-31.ams2.redhat.com [10.36.6.31]) by int-mx13.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with SMTP id u1MKCgVQ008361; Mon, 22 Feb 2016 15:12:43 -0500 Date: Mon, 22 Feb 2016 22:12:41 +0200 From: "Michael S. Tsirkin" To: Gerd Hoffmann Message-ID: <20160222220400-mutt-send-email-mst@redhat.com> References: <1456144729-17196-1-git-send-email-mst@redhat.com> <1456151216.29896.63.camel@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1456151216.29896.63.camel@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.26 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x X-Received-From: 209.132.183.28 Cc: Peter Maydell , Xiao Guangrong , Eduardo Habkost , Igor Mammedov , "Gabriel L. Somlo" , qemu-devel@nongnu.org, Michael Walle , Kevin O'Connor , qemu-arm@nongnu.org, Shannon Zhao , Paolo Bonzini , Richard Henderson Subject: Re: [Qemu-arm] [Qemu-devel] [PATCH RFC] fw-cfg: support writeable blobs X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org Sender: qemu-arm-bounces+alex.bennee=linaro.org@nongnu.org X-TUID: pN1X6UHKYn95 On Mon, Feb 22, 2016 at 03:26:56PM +0100, Gerd Hoffmann wrote: > On Mo, 2016-02-22 at 14:41 +0200, Michael S. Tsirkin wrote: > > Useful to send guest data back to QEMU. > > Use case? > > cheers, > Gerd VM GEN ID at least wants to pass address of some blob in guest memory to host. Apparently, that's also useful for nvdimm. A reasonable way to do that seems to be to write it into fw cfg file, this way it's also migrated automatically. -- MST