Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754121AbYJASUJ (ORCPT ); Wed, 1 Oct 2008 14:20:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753466AbYJAST4 (ORCPT ); Wed, 1 Oct 2008 14:19:56 -0400 Received: from terminus.zytor.com ([198.137.202.10]:51765 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752570AbYJASTz (ORCPT ); Wed, 1 Oct 2008 14:19:55 -0400 Message-ID: <48E3BE65.2050909@zytor.com> Date: Wed, 01 Oct 2008 11:16:05 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Jeremy Fitzhardinge CC: akataria@vmware.com, "avi@redhat.com" , Rusty Russell , Gerd Hoffmann , Ingo Molnar , the arch/x86 maintainers , LKML , "Nakajima, Jun" , Dan Hecht , Zachary Amsden , virtualization@lists.linux-foundation.org, kvm@vger.kernel.org Subject: Re: [RFC] CPUID usage for interaction between Hypervisors and Linux. References: <1222881242.9381.17.camel@alok-dev1> <48E3BBC1.2050607@goop.org> <48E3BC47.60900@zytor.com> <48E3BD83.2090801@goop.org> In-Reply-To: <48E3BD83.2090801@goop.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1117 Lines: 26 Jeremy Fitzhardinge wrote: >> >> I suspect we can get a larger number space if we ask Intel & AMD. In >> fact, I think we should request that the entire 0x40xxxxxx numberspace >> is assigned to virtualization *anyway*. > > Yes, that would be good. In that case I'd revise my proposal to back > each leaf block 256 leaves instead of 16. But it still needs to be a > proper enumeration with signatures, rather than assigning fixed points > in that space to specific interfaces. > With a sufficiently large block, we could use fixed points, e.g. by having each vendor create interfaces in the 0x40SSSSXX range, where SSSS is the PCI ID they use for PCI devices. Note that I said "create interfaces". It's important that all about this is who specified the interface -- for "what hypervisor is this" just use 0x40000000 and disambiguate based on that. -hpa -- 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/