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x86/apic: Handle XAPIC remap mode proper.

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If remapping is in XAPIC mode, the setup code just skips X2APIC
initialization without checking max CPU APIC ID in system, which may
cause problem if system has a CPU with APIC ID bigger than 255.

Handle IR in XAPIC mode the same way as if remapping is disabled.

[ tglx: Split out from previous patch ]

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: H. Peter Anvin <hpa@linux.intel.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: David Rientjes <rientjes@google.com>
Cc: HATAYAMA Daisuke <d.hatayama@jp.fujitsu.com>
Cc: Jan Beulich <JBeulich@suse.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Oren Twaig <oren@scalemp.com>
Link: http://lkml.kernel.org/r/1420615903-28253-8-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Jiang Liu 2015-01-07 15:31:34 +08:00 committed by Thomas Gleixner
parent 07806c50bd
commit ef1b2b8ad1
1 changed files with 1 additions and 5 deletions
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6
arch/x86/kernel/apic/apic.c
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@ -1596,7 +1596,7 @@ static __init void try_to_enable_x2apic(int ir_stat)
if (!x2apic_supported())
return;
if (ir_stat < 0) {
if (ir_stat != IRQ_REMAP_X2APIC_MODE) {
/* IR is required if there is APIC ID > 255 even when running
* under KVM
*/
@ -1613,10 +1613,6 @@ static __init void try_to_enable_x2apic(int ir_stat)
* only in physical mode
*/
x2apic_force_phys();
} else if (ir_stat == IRQ_REMAP_XAPIC_MODE) {
pr_info("x2apic not enabled, IRQ remapping is in xapic mode\n");
return;
}
if (!x2apic_mode) {