Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161189AbWALTLQ (ORCPT ); Thu, 12 Jan 2006 14:11:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161190AbWALTLQ (ORCPT ); Thu, 12 Jan 2006 14:11:16 -0500 Received: from e6.ny.us.ibm.com ([32.97.182.146]:51143 "EHLO e6.ny.us.ibm.com") by vger.kernel.org with ESMTP id S1161189AbWALTLP (ORCPT ); Thu, 12 Jan 2006 14:11:15 -0500 Message-ID: <43C6A9CE.9080105@us.ibm.com> Date: Thu, 12 Jan 2006 14:11:10 -0500 From: "Mike D. Day" User-Agent: Thunderbird 1.5 (Macintosh/20051201) MIME-Version: 1.0 To: Anthony Liguori CC: Arjan van de Ven , Greg KH , Gerd Hoffmann , lkml , xen-devel@lists.xensource.com Subject: Re: [RFC] [PATCH] sysfs support for Xen attributes References: <43C53DA0.60704@us.ibm.com> <20060111230704.GA32558@kroah.com> <43C5A199.1080708@us.ibm.com> <20060112005710.GA2936@kroah.com> <43C5B59C.8050908@us.ibm.com> <43C65196.8040402@suse.de> <1137072089.2936.29.camel@laptopd505.fenrus.org> <43C66ACC.60408@suse.de> <20060112173926.GD10513@kroah.com> <43C6A5B4.80801@us.ibm.com> <1137092120.2936.55.camel@laptopd505.fenrus.org> <43C6A70D.8010902@us.ibm.com> In-Reply-To: <43C6A70D.8010902@us.ibm.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1107 Lines: 37 Anthony Liguori wrote: > Arjan van de Ven wrote: > >> On Thu, 2006-01-12 at 12:53 -0600, Anthony Liguori wrote: >> >> >>> We wish to make management hypercalls as the root user in userspace >>> which means we have to go through the kernel. Currently, we do this >>> by having /proc/xen/privcmd accept an ioctl() that takes a structure >>> that describe the register arguments. The kernel interface allows us >>> to control who in userspace can execute hypercalls. >>> >> >> ioctls on proc is evil though (so is ioctl-on-sysfs). It's a device not >> a proc file! >> >> > I full heartedly agree with you :-) What about making hypercalls via with a read/write interface into memory mapped by a char device? Any problems with that approach? Mike -- Mike D. Day STSM and Architect, Open Virtualization IBM Linux Technology Center ncmike@us.ibm.com - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/