Commit 84fdfafa authored Feb 27, 2019 by Lan Tianyu Committed by Joerg Roedel Feb 28, 2019

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



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>

parent 5908e6b7

arch/x86/kernel/cpu/mshyperv.c

+12 −0

Original line number	Diff line number	Diff line
		@@ -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
		}

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