[Xen-devel] Enabling VT-d PI by default

[Chao Gao <chao.gao@xxxxxxxxx>]

Hello, Jan.

As you know, with VT-d PI enabled, hardware can directly deliver external
interrupts to guest without any VMM intervention. It will reduces overall
interrupt latency to guest and reduces overheads otherwise incurred by the
VMM for virtualizing interrupts. In my mind, it's an important feature to
interrupt virtualization.

But VT-d PI feature is disabled by default on Xen for some corner
cases and bugs. Based on Feng's work, we have fixed those corner
cases related to VT-d PI. Do you think it is a time to enable VT-d PI by
default. If no, could you list your concerns so that we can resolve them?

Thanks
Chao

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