[Question about KVM on arm64] Consider putting VINVALL to deactivation

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Hi Marc,

On activation, VMAPP command is followed by a VINVALL, which could be quite expensive
for the start-up of virtual machine. If a vpeid is allowed successfully, it is not
used in system. We may consider put VINVALL to deactivation to ensure all cache of
certain vpeid is invalid, to simplify activation. We consider start-up may be more
common and more time-consuming-sensitive than shutdown process.

Do you think it's all right?

Thanks,
Shaokun

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