1. With the patch "x86/vector/msi: Switch to global reservation mode",
the recent v4.15 and newer kernels always hang for 1-vCPU Hyper-V VM
with SR-IOV. This is because when we reach hv_compose_msi_msg() by
request_irq() -> request_threaded_irq() ->__setup_irq()->irq_startup()
-> __irq_startup()
1. With the patch "x86/vector/msi: Switch to global reservation mode",
the recent v4.15 and newer kernels always hang for 1-vCPU Hyper-V VM
with SR-IOV. This is because when we reach hv_compose_msi_msg() by
request_irq() -> request_threaded_irq() ->__setup_irq()->irq_startup()
-> __irq_startup()
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