From: Tianyu Lan <redacted> Sent: Wednesday, February 27, 2019 6:54 AM

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 <redacted>
Reviewed-by: Michael Kelley <redacted>
Signed-off-by: Lan Tianyu <redacted>
---
Change since v5:
       - Fix comile error due to x2apic_phys

Change since v2:
       - Fix compile error due to x2apic_phys
       - Fix comment indent
Change since v1:
       - Remove redundant extern for x2apic_phys
---
 arch/x86/kernel/cpu/mshyperv.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

Reconfirming my reviewed-by after the change to fix the
compile error detected by the kbuild test robot.

Reviewed-by: Michael Kelley <redacted>