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virtual interrupts

hello guys ,

A hypervisor executing at EL2 can generate virtual interrupts using the List registers. 

and set HCR_EL2.VI or HCR_EL2.VF can also make a "virtual IRQ" pending. 

so, what is the different between them ? 

or is it necessary to set HCR_EL2.VI after writing List registers?

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