From owner-soc-status@FreeBSD.ORG Thu Apr 18 13:14:39 2013 Return-Path: Delivered-To: soc-status@freebsd.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id 06137B43; Thu, 18 Apr 2013 13:14:39 +0000 (UTC) (envelope-from gbtju85@gmail.com) Received: from mail-bk0-x231.google.com (mail-bk0-x231.google.com [IPv6:2a00:1450:4008:c01::231]) by mx1.freebsd.org (Postfix) with ESMTP id 6F58ED60; Thu, 18 Apr 2013 13:14:38 +0000 (UTC) Received: by mail-bk0-f49.google.com with SMTP id w12so1266161bku.36 for ; Thu, 18 Apr 2013 06:14:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:x-received:in-reply-to:references:date:message-id :subject:from:to:cc:content-type; bh=ssIIyS/fwurbbkP3xEuQiP6C0MJCE6qHatKKtbs0mf8=; b=T7d8AyUkGRDs+LtLX4zfMoYfjTiLDdFhwEoMVrDCHc3pfOOcHz4wc6LLjzQJRVTv+i Dbw6HNXB9JEQWpa5DPEEczMhqfy2ZAaas9a7XWHllj7+DyMvZZVTBJcRy599CNfPf8LD 0DILKCXqWFdlbxmy0z/FIxYnEEcSW4f9UMQNfdf1iiGRyM4+887wlUP7/6Xx3Kn/BpFy 2CHE8LJvkH9txGHDuAMh3FdcGZ/ByPtiPTSt0lvHsr/xfYinWzn39CI1fnJ1FTxknBnw RRJn1Pp2CISCp9ZG5rICgsbpzOv5ORPcuPDim3nktsw6JV57Hmt2kpezjAhrkR/iUXy/ k/LA== MIME-Version: 1.0 X-Received: by 10.204.173.9 with SMTP id n9mr3974085bkz.47.1366290877498; Thu, 18 Apr 2013 06:14:37 -0700 (PDT) Received: by 10.205.114.141 with HTTP; Thu, 18 Apr 2013 06:14:37 -0700 (PDT) In-Reply-To: <7AB96913-9118-4298-B183-A3D5EBC6F209@freebsd.org> References: <920A79FE-8C56-4D26-8611-3CD48602FC3B@freebsd.org> <7AB96913-9118-4298-B183-A3D5EBC6F209@freebsd.org> Date: Thu, 18 Apr 2013 21:14:37 +0800 Message-ID: Subject: =?GB2312?Q?Re=3A_Mentor_of_the_Project_=22PCI_frontend_XEN_PV_drive?= =?GB2312?Q?r=22=A3=BF?= From: Bei Guan To: "Justin T. Gibbs" Content-Type: text/plain; charset=ISO-8859-1 X-Content-Filtered-By: Mailman/MimeDel 2.1.14 Cc: soc-status X-BeenThere: soc-status@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Summer of Code Status Reports and Discussion List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 18 Apr 2013 13:14:39 -0000 2013/4/16 Justin T. Gibbs > On Apr 12, 2013, at 3:02 AM, Bei Guan wrote: > > > Thank you for your reply. > > > > I think it's also a good project for me to write a SCSI or USB PV > frontend for FreeBSD. I'm interest in Xen and have done some development > about Xen PV and HVM, but I didn't do any development on FreeBSD. As to > this project, where should I start? Is there any other similar FreeBSD > project I can refer to? > > Front-end drivers for network, block, and control already exist and should > serve as a good starting point for the creation of another PV driver. > > I've also updated the ideas page to include more information about our > existing XEN implementation and what will be required for these projects. > > > In order to write a SCSI or USB PV driver, do we need the Xen PV drivers > in FreeBSD, such as event channel, hypercalls, xenbus, and so on? > > Yes, FreeBSD already has support for all XenBus APIs needed to write these > drivers. See "sys/xen" and "sys/dev/xen" in the FreeBSD kernel source tree. > > > You said the "drivers can be developed using an HVM guest", can you give > me more information about it? > > Typically, you install FreeBSD using standard install media as a full HVM > guest on a system running Xen. Then compile a custom kernel using the > XENHVM config file in order to activate the existing PV drivers. > Hi Justin, Does this project need to provide USB/SCSI PV drivers to both 32-bit and 64-bit FreeBSD? I've compiled the FreeBSD 8.3 (i386) as Xen DomU with the XENHVM config. But, It cannot boot successfully. The screenshot is attached. According to the page https://wiki.freebsd.org/FreeBSD/Xen , 32-bit FreeBSD should work when compiled with XENHVM config. I will try the 64-bit FreeBSD. However, if the FreeBSD boot successfully (compiled with XENHVM config), how can we know it really uses the PV drivers instead of the native drivers? Thanks, Bei Guan > > -- > Justin > >