From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:44542) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y1uEv-0008WF-9q for qemu-devel@nongnu.org; Fri, 19 Dec 2014 04:53:00 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Y1uEn-0004em-Q6 for qemu-devel@nongnu.org; Fri, 19 Dec 2014 04:52:53 -0500 Received: from cantor2.suse.de ([195.135.220.15]:51551 helo=mx2.suse.de) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Y1uEn-0004eX-Ip for qemu-devel@nongnu.org; Fri, 19 Dec 2014 04:52:45 -0500 Message-ID: <5493F56B.6010600@suse.de> Date: Fri, 19 Dec 2014 10:52:43 +0100 From: Alexander Graf MIME-Version: 1.0 References: <1418850613-26821-1-git-send-email-lersek@redhat.com> <1418981969.5867.56.camel@nilsson.home.kraxel.org> In-Reply-To: <1418981969.5867.56.camel@nilsson.home.kraxel.org> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH v5 00/11] fw_cfg, bootorder, and UEFI+'-kernel' on arm/virt List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Gerd Hoffmann , Laszlo Ersek Cc: peter.maydell@linaro.org, drjones@redhat.com, pbonzini@redhat.com, qemu-devel@nongnu.orgrjones@redhat.com On 19.12.14 10:39, Gerd Hoffmann wrote: > Hi, > > Attached is a patch drafting a dma interface for fw_cfg, lousily based > on the ideas I've outlined a few days ago on this list. Applies on top > of this patch series. > > Host side only, unfinished, untested. Mainly sending this out as > notification that I've looked into this, to avoid duplicating work. > I'll go disappear into xmas vacation in a few hours and will not > continue with this until next year. > > My plan is to coordinate in January with Laszlo how to go forward. If > someone feels bored during the holidays feel free to grab it and run > with it. Nice first draft :). The major thing I would do differently is the way to access the DMA registers. Instead of making them even more PIO/MMIO ports, I'd rather just make them one big 256 bit fw_cfg entry. That way we don't need to modify (and synchronize) any machine port layout to support DMA. Alex