Can vfio ioeventfd be used for gvt acceleration?

[Zhe Liu]

Recently, Alex post a patch in the kvm community to add ioeventfd support
for vfio.

https://lkml.org/lkml/2018/2/6/866

This patch adds a shortcut for guest to directly trigger driver events,
though the message addr and data is preprogrammed.

Can this patch be used for gvt? For example, to accelerate MSI-ACK or DMA
kick?
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