From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wei Liu Subject: Re: Translate virtual address to physical address Date: Sun, 1 Jan 2012 15:22:15 +0000 Message-ID: <1325431335.24422.65.camel@liuw-desktop> References: <1325368336020-5112670.post@n5.nabble.com> <1325418687.24422.36.camel@liuw-desktop> <92932E0E-BC3F-44CD-953E-AC3CB7D8F0A1@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <92932E0E-BC3F-44CD-953E-AC3CB7D8F0A1@gmail.com> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: lmingcsce Cc: "xen-devel@lists.xensource.com" , wei.liu2@citrix.com List-Id: xen-devel@lists.xenproject.org Please don't top-posting. On Sun, 2012-01-01 at 14:59 +0000, lmingcsce wrote: > Thanks for your reply. > "Establishing a new array in the tools directory" means that I declare > a new array in /tools/libxc/xc_domain_save.c and want to pass the > physical address of this array to the hypervisor. > I have already tried copy_to_user and copy_to_guest and from the > experiment, I find that there is size limit for these two functions. What size limit? I don't quite get it. I've never seen an array large enough to bloat whole address space. > By the way, I also want to ask the code organization of xen. What's > the function of stubdom directory? stubdom is used to boost HVM performance. It is based on minios, with qemu compiled in. It is not mandatory though. > When the virtual machines execute, the function in tools will execute > in the Dom0 space? Can you illustrate that for me or give me some > specific material? I have already seen some explanation, and don't > find the answer. > Thanks. Of course tools run in Dom0, they are just normal user programs. However, every functionality requires hypervisor to do the actual job. A normal work flow is like: toolstack ---(syscall)--> kernel ---(hypercall)--> hypervisor The kernel entry is /proc/xen/privcmd, whose source code is in Linux tree drivers/xen/xenfs. Wei.