From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754287AbZCJBLY (ORCPT ); Mon, 9 Mar 2009 21:11:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753075AbZCJBLK (ORCPT ); Mon, 9 Mar 2009 21:11:10 -0400 Received: from terminus.zytor.com ([198.137.202.10]:50651 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752062AbZCJBLJ (ORCPT ); Mon, 9 Mar 2009 21:11:09 -0400 Message-ID: <49B5BD63.1090909@zytor.com> Date: Mon, 09 Mar 2009 18:07:47 -0700 From: "H. Peter Anvin" User-Agent: Thunderbird 2.0.0.14 (X11/20080501) MIME-Version: 1.0 To: Jeremy Fitzhardinge CC: the arch/x86 maintainers , Linux Kernel Mailing List , Xen-devel , Jeremy Fitzhardinge Subject: Re: [PATCH] paravirt/xen: add pvop for page_is_ram References: <1235786365-17744-1-git-send-email-jeremy@goop.org> <1235786365-17744-10-git-send-email-jeremy@goop.org> In-Reply-To: <1235786365-17744-10-git-send-email-jeremy@goop.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Jeremy Fitzhardinge wrote: > From: Jeremy Fitzhardinge > > A guest domain may have external pages mapped into its address space, > in order to share memory with other domains. These shared pages are > more akin to io mappings than real RAM, and should not pass the > page_is_ram test. Add a paravirt op for this so that a hypervisor > backend can validate whether a page should be considered ram or not. > > Signed-off-by: Jeremy Fitzhardinge > Why are these pages mapped as RAM in the memory map? That is the right way to handle that, not by adding yet another bloody hook... -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.