From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753304Ab1AEXGg (ORCPT ); Wed, 5 Jan 2011 18:06:36 -0500 Received: from kroah.org ([198.145.64.141]:50811 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753279Ab1AEXGe (ORCPT ); Wed, 5 Jan 2011 18:06:34 -0500 X-Mailbox-Line: From gregkh@clark.site Wed Jan 5 15:03:26 2011 Message-Id: <20110105230326.068443369@clark.site> User-Agent: quilt/0.48-11.2 Date: Wed, 05 Jan 2011 15:00:44 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Kenji Kaneshige , Suresh Siddha , Chris Wright , "H. Peter Anvin" Subject: [26/49] x86: Enable the intr-remap fault handling after local APIC setup In-Reply-To: <20110105230438.GA26241@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.32-longterm review patch. If anyone has any objections, please let us know. ------------------ From: Kenji Kaneshige commit 7f7fbf45c6b748074546f7f16b9488ca71de99c1 upstream. Interrupt-remapping gets enabled very early in the boot, as it determines the apic mode that the processor can use. And the current code enables the vt-d fault handling before the setup_local_APIC(). And hence the APIC LDR registers and data structure in the memory may not be initialized. So the vt-d fault handling in logical xapic/x2apic modes were broken. Fix this by enabling the vt-d fault handling in the end_local_APIC_setup() A cleaner fix of enabling fault handling while enabling intr-remapping will be addressed for v2.6.38. [ Enabling intr-remapping determines the usage of x2apic mode and the apic mode determines the fault-handling configuration. ] Signed-off-by: Kenji Kaneshige LKML-Reference: <20101201062244.541996375@intel.com> Signed-off-by: Suresh Siddha Acked-by: Chris Wright Signed-off-by: H. Peter Anvin Signed-off-by: Greg Kroah-Hartman --- arch/x86/kernel/apic/apic.c | 8 ++++++++ arch/x86/kernel/apic/probe_64.c | 7 ------- 2 files changed, 8 insertions(+), 7 deletions(-) --- a/arch/x86/kernel/apic/apic.c +++ b/arch/x86/kernel/apic/apic.c @@ -1361,6 +1361,14 @@ void __cpuinit end_local_APIC_setup(void setup_apic_nmi_watchdog(NULL); apic_pm_activate(); + + /* + * Now that local APIC setup is completed for BP, configure the fault + * handling for interrupt remapping. + */ + if (!smp_processor_id() && intr_remapping_enabled) + enable_drhd_fault_handling(); + } #ifdef CONFIG_X86_X2APIC --- a/arch/x86/kernel/apic/probe_64.c +++ b/arch/x86/kernel/apic/probe_64.c @@ -76,13 +76,6 @@ void __init default_setup_apic_routing(v /* need to update phys_pkg_id */ apic->phys_pkg_id = apicid_phys_pkg_id; } - - /* - * Now that apic routing model is selected, configure the - * fault handling for intr remapping. - */ - if (intr_remapping_enabled) - enable_drhd_fault_handling(); } /* Same for both flat and physical. */