From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jacob Gorm Hansen Subject: Re: Building domains as a lesser user (was Re: boot loaders for domain != 0) Date: Thu, 03 Feb 2005 19:56:29 -0800 Message-ID: <4202F26D.3060003@diku.dk> References: <4202CB48.2040704@diku.dk> <4202DB0F.1050102@codemonkey.ws> <4202E915.4030100@diku.dk> <4202ED53.70802@codemonkey.ws> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit In-Reply-To: <4202ED53.70802@codemonkey.ws> Sender: xen-devel-admin@lists.sourceforge.net Errors-To: xen-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Anthony Liguori Cc: xen-devel@lists.sourceforge.net List-Id: xen-devel@lists.xenproject.org Anthony Liguori wrote: > Jacob Gorm Hansen wrote: > >> Anthony Liguori wrote: >> >> If we trust Linux to enforce security, we do not need Xen at all ;-) >> > The current architecture of Xen requires that we trust whatever is > running in Domain-0. The problems being cited wouldn't be a problem if > you could create domains from unpriviledged Domains because you could > have creator Domains who could be created from a trusted source and used > as a buffer against attack. If you start having domains that can create other domains, IPC, shared memory between domains, all that, you have essentially turned Xen into a microkernel, and you start having all sorts of funny issues like access control, domain ownership, QoS crosstalk and whatnot. And in ten years from now someone will have to invent a new VMM layer to put below Xen only to get another fresh start. I am sure the original UNIX also seemed elegant at first, in the days when it didn't have 250+ different syscalls... Jacob ------------------------------------------------------- This SF.Net email is sponsored by: IntelliVIEW -- Interactive Reporting Tool for open source databases. Create drag-&-drop reports. Save time by over 75%! Publish reports on the web. Export to DOC, XLS, RTF, etc. Download a FREE copy at http://www.intelliview.com/go/osdn_nl