From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262065AbVHFMsy (ORCPT ); Sat, 6 Aug 2005 08:48:54 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261845AbVHFMsy (ORCPT ); Sat, 6 Aug 2005 08:48:54 -0400 Received: from ozlabs.org ([203.10.76.45]:17818 "EHLO ozlabs.org") by vger.kernel.org with ESMTP id S261813AbVHFMsu (ORCPT ); Sat, 6 Aug 2005 08:48:50 -0400 Subject: Re: [PATCH, experimental] i386 Allow the fixmap to be relocated at boot time From: Rusty Russell To: Zachary Amsden Cc: Chris Wright , virtualization@lists.osdl.org, xen-devel@lists.xensource.com, Linux Kernel Mailing List In-Reply-To: <42F3FFBA.3040009@vmware.com> References: <42F3F61F.30305@vmware.com> <20050805234655.GY7762@shell0.pdx.osdl.net> <42F3FFBA.3040009@vmware.com> Content-Type: text/plain Date: Sat, 06 Aug 2005 22:48:49 +1000 Message-Id: <1123332529.17152.47.camel@localhost.localdomain> Mime-Version: 1.0 X-Mailer: Evolution 2.2.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 2005-08-05 at 17:09 -0700, Zachary Amsden wrote: > Also, it seems reasonable that people may want to poke holes in high > linear space for other hypervisor projects, research, or performance > reasons without having to build a custom sub-architecture just for > that. So I think there is some benefit to making the hole size a > general configurable option (with defaults depending on the sub-arch you > select). qemu-fast needs a kernel with __FIXADDR_TOP 0xa7fff000, and PAGE_OFFSET 0x90000000. I used to continually patch my kernels, but these days I just run full qemu and take the speed hit. If this was easier, it would be really nice to have that speed back. Rusty. -- A bad analogy is like a leaky screwdriver -- Richard Braakman