Can vfio ioeventfd be used for gvt acceleration?

[Zhenyu Wang]

On 2018.04.16 11:43:05 +0800, Zhe Liu wrote:
> 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?

One possible usage we discussed is for gpu master irq enable which does not require
synchronized emulation, but currently haven't done experiment on that and no data on
how much gain that can bring.

-- 
Open Source Technology Center, Intel ltd.

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