From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756244AbZELXZv (ORCPT ); Tue, 12 May 2009 19:25:51 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752962AbZELXZZ (ORCPT ); Tue, 12 May 2009 19:25:25 -0400 Received: from 75-149-38-2-SFBA.hfc.comcastbusiness.net ([75.149.38.2]:36160 "EHLO abulafia.goop.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752687AbZELXZY (ORCPT ); Tue, 12 May 2009 19:25:24 -0400 From: Jeremy Fitzhardinge To: Ingo Molnar Cc: the arch/x86 maintainers , Linux Kernel Mailing List , Xen-devel , Jeremy Fitzhardinge , Jeremy Fitzhardinge Subject: [PATCH 04/17] xen: create dummy ioapic mapping Date: Tue, 12 May 2009 16:25:11 -0700 Message-Id: <1242170724-13349-5-git-send-email-jeremy@goop.org> X-Mailer: git-send-email 1.6.0.6 In-Reply-To: <1242170724-13349-1-git-send-email-jeremy@goop.org> References: <1242170724-13349-1-git-send-email-jeremy@goop.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. [ Impact: debuggability (make failures obvious) ] 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 331e52d..139c8de 100644 --- a/arch/x86/xen/mmu.c +++ b/arch/x86/xen/mmu.c @@ -1919,6 +1919,16 @@ static void xen_set_fixmap(unsigned idx, phys_addr_t 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