From: Boqun Feng <redacted> Sent: Wednesday, February 16, 2022 7:45 PM

On ARM64 Hyper-V guests, SPIs are used for the interrupts of virtual PCI
devices, and SPIs can be managed directly via GICD registers. Therefore
the retarget interrupt hypercall is not needed on ARM64.

An arch-specific interface hv_arch_irq_unmask() is introduced to handle
the architecture level differences on this. For x86, the behavior
remains unchanged, while for ARM64 no hypercall is invoked when
unmasking an irq for virtual PCI devices.

Signed-off-by: Boqun Feng <redacted>
---
v1 -> v2:

*	Introduce arch-specific interface hv_arch_irq_unmask() as
	suggested by Bjorn

 drivers/pci/controller/pci-hyperv.c | 233 +++++++++++++++-------------
 1 file changed, 122 insertions(+), 111 deletions(-)

Reviewed-by: Michael Kelley <redacted>