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在ARM architecture系統中，除了有IRQ、FIQ，還有VIRQ、VFIQ

那么怎樣才能產生VFIQ、VIRQ呢？

方法一: 給寄存器HCR_EL2的下列的比特置1,就能產生一個虛擬中斷到PSTATE Masking
? VI = Setting this bit registers a vIRQ.
? VF = Setting this bit registers a vFIQ.
? VSE = Setting this bit registers a vSError

產生虛擬中斷后，該中斷處于pending狀態

方法二：使用gic控制器產生一個虛擬中斷
The hypervisor can map the virtual CPU interface into a VM, allowing software in that VM to communicate directly with the GIC

The diagram illustrates these steps:

The physical peripheral asserts its interrupt signal into the GIC.

The GIC generates a physical interrupt exception, either IRQ or FIQ, which gets routed to EL2 by
the configuration of HCR_EL2.IMO/FMO. The hypervisor identifies the peripheral and
determines that it has been assigned to a VM. It checks which vCPU the interrupt should be
forwarded to.

The hypervisor configures the GIC to forward the physical interrupt as a virtual interrupt to the
vCPU. The GIC will then assert the vIRQ or vFIQ signal, but the processor will ignore this signal
while it is executing in EL2.

The hypervisor returns control to the vCPU.

Now that the processor is in the vCPU (EL0 or EL1), the virtual interrupt from the GIC can be
taken. This virtual interrupt is subject to the PSTATE exception masks

總結

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