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x86/Hyper-V: Set x2apic destination mode to physical when x2apic is available

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Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic,
set x2apic destination mode to physcial mode when x2apic is available
and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs have
8-bit APIC id.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Michael Kelley <mikelley@microsoft.com>
Signed-off-by: Lan Tianyu <Tianyu.Lan@microsoft.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Lan Tianyu 2019-02-27 22:54:03 +08:00 committed by Joerg Roedel
parent 5908e6b738
commit 84fdfafab8
1 changed files with 12 additions and 0 deletions
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12
arch/x86/kernel/cpu/mshyperv.c
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@ -328,6 +328,18 @@ static void __init ms_hyperv_init_platform(void)
# ifdef CONFIG_SMP
smp_ops.smp_prepare_boot_cpu = hv_smp_prepare_boot_cpu;
# endif
/*
* Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic,
* set x2apic destination mode to physcial mode when x2apic is available
* and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs
* have 8-bit APIC id.
*/
# ifdef CONFIG_X86_X2APIC
if (x2apic_supported())
x2apic_phys = 1;
# endif
#endif
}