From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1764711AbZEHAfw (ORCPT ); Thu, 7 May 2009 20:35:52 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756799AbZEHALA (ORCPT ); Thu, 7 May 2009 20:11:00 -0400 Received: from adsl-76-233-236-102.dsl.pltn13.sbcglobal.net ([76.233.236.102]:52707 "EHLO abulafia.goop.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754083AbZEHAJy (ORCPT ); Thu, 7 May 2009 20:09:54 -0400 From: Jeremy Fitzhardinge To: Ingo Molnar Cc: the arch/x86 maintainers , Linux Kernel Mailing List , Xen-devel , Jeremy Fitzhardinge , Jeremy Fitzhardinge Subject: [PATCH 03/18] xen: create dummy ioapic mapping Date: Thu, 7 May 2009 14:14:28 -0700 Message-Id: <1241730883-4917-4-git-send-email-jeremy@goop.org> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1241730883-4917-1-git-send-email-jeremy@goop.org> References: <1241730883-4917-1-git-send-email-jeremy@goop.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Impact: debuggability (make failures obvious) We don't allow direct access to the IO apic, so make sure that any request to map it just "maps" non-present pages. We should see any attempts at direct access explode nicely. Signed-off-by: Jeremy Fitzhardinge --- arch/x86/xen/mmu.c | 10 ++++++++++ 1 files changed, 10 insertions(+), 0 deletions(-) diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c index 55da7f9..b105b73 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1907,6 +1907,16 @@ static void xen_set_fixmap(unsigned idx, unsigned long phys, pgprot_t prot) pte = pfn_pte(phys, prot); break; +#ifdef CONFIG_X86_IO_APIC + case FIX_IO_APIC_BASE_0 ... FIX_IO_APIC_BASE_END: + /* + * We just don't map the IO APIC - all access is via + * hypercalls. Keep the address in the pte for reference. + */ + pte = pfn_pte(phys, PAGE_NONE); + break; +#endif + case FIX_PARAVIRT_BOOTMAP: /* This is an MFN, but it isn't an IO mapping from the IO domain */ -- 1.6.0.6