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x86: Enable the intr-remap fault handling after local APIC setup

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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 <kaneshige.kenji@jp.fujitsu.com>
LKML-Reference: <20101201062244.541996375@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: stable@kernel.org [v2.6.32+]
Acked-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Kenji Kaneshige 2010-11-30 22:22:28 -08:00 committed by H. Peter Anvin
parent 086e8ced65
commit 7f7fbf45c6
2 changed files with 8 additions and 7 deletions
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8
arch/x86/kernel/apic/apic.c
View file

@ -1389,6 +1389,14 @@ 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

7
arch/x86/kernel/apic/probe_64.c
View file

@ -79,13 +79,6 @@ void __init default_setup_apic_routing(void)
/* 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. */