assigned dev msi int handling

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Hi Sheng,

So for guest INTX interrupts the host interrupt is reenabled on ack from
the guest, which is nice. Now for guest MSI interrupts it keeps reenabling
the interrupt as fast as the work handler can run.

Can you explain why it works this way? Why not disable interrupts 
on the host in all cases and only reenable on ack?

Thanks

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