From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753731AbZBEOaQ (ORCPT ); Thu, 5 Feb 2009 09:30:16 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751825AbZBEOaA (ORCPT ); Thu, 5 Feb 2009 09:30:00 -0500 Received: from mx2.mail.elte.hu ([157.181.151.9]:47068 "EHLO mx2.mail.elte.hu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751932AbZBEOaA (ORCPT ); Thu, 5 Feb 2009 09:30:00 -0500 Date: Thu, 5 Feb 2009 15:29:12 +0100 From: Ingo Molnar To: Jeremy Fitzhardinge Cc: "H. Peter Anvin" , William Lee Irwin III , Linux Kernel Mailing List , Xen-devel Subject: Re: __supported_pte_mask breaks PROT_NONE pages Message-ID: <20090205142912.GE28443@elte.hu> References: <498A5002.9080408@goop.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <498A5002.9080408@goop.org> User-Agent: Mutt/1.5.18 (2008-05-17) X-ELTE-VirusStatus: clean X-ELTE-SpamScore: -1.5 X-ELTE-SpamLevel: X-ELTE-SpamCheck: no X-ELTE-SpamVersion: ELTE 2.0 X-ELTE-SpamCheck-Details: score=-1.5 required=5.9 tests=BAYES_00 autolearn=no SpamAssassin version=3.2.3 -1.5 BAYES_00 BODY: Bayesian spam probability is 0 to 1% [score: 0.0000] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org * Jeremy Fitzhardinge wrote: > On an x86 system which doesn't support global mappings, > __supported_pte_mask has _PAGE_GLOBAL clear, to make sure it never > appears in the PTE. pfn_pte() and so on will enforce it with: btw., did you actually see a boot crash due to this, on a pre-PGE system? Ingo From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ingo Molnar Subject: Re: __supported_pte_mask breaks PROT_NONE pages Date: Thu, 5 Feb 2009 15:29:12 +0100 Message-ID: <20090205142912.GE28443@elte.hu> References: <498A5002.9080408@goop.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: <498A5002.9080408@goop.org> List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Sender: xen-devel-bounces@lists.xensource.com Errors-To: xen-devel-bounces@lists.xensource.com To: Jeremy Fitzhardinge Cc: Xen-devel , Linux Kernel Mailing List , William Lee Irwin III , "H. Peter Anvin" List-Id: xen-devel@lists.xenproject.org * Jeremy Fitzhardinge wrote: > On an x86 system which doesn't support global mappings, > __supported_pte_mask has _PAGE_GLOBAL clear, to make sure it never > appears in the PTE. pfn_pte() and so on will enforce it with: btw., did you actually see a boot crash due to this, on a pre-PGE system? Ingo