From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757433AbYEWNNw (ORCPT ); Fri, 23 May 2008 09:13:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756136AbYEWNNO (ORCPT ); Fri, 23 May 2008 09:13:14 -0400 Received: from gw.goop.org ([64.81.55.164]:33956 "EHLO mail.goop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756056AbYEWNNM (ORCPT ); Fri, 23 May 2008 09:13:12 -0400 Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Subject: [PATCH 4 of 5] xen: allow some cr4 updates X-Mercurial-Node: f0c894b6eba80461ec48db663f5a22660fdeb363 Message-Id: In-Reply-To: Date: Fri, 23 May 2008 14:10:57 +0100 From: Jeremy Fitzhardinge To: Ingo Molnar Cc: LKML Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The guest can legitimately change things like cr4.OSFXSR and OSXMMEXCPT, so let it. Signed-off-by: Jeremy Fitzhardinge --- arch/x86/xen/enlighten.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c --- a/arch/x86/xen/enlighten.c +++ b/arch/x86/xen/enlighten.c @@ -648,8 +648,10 @@ static void xen_write_cr4(unsigned long cr4) { - /* Just ignore cr4 changes; Xen doesn't allow us to do - anything anyway. */ + cr4 &= ~X86_CR4_PGE; + cr4 &= ~X86_CR4_PSE; + + native_write_cr4(cr4); } static unsigned long xen_read_cr3(void)