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Re: [Xen-devel] [Q] Is qemu used when we use VTd?

Hi, Yuji

Yuji Shimada wrote:
I suspect MMCONFIG is needed to access Extended PCI
configuration space of PCI-Express. Probably PCI-Express card
can work without those access.
But we can't use full features of PCI-Express cards, right?

Yes. For example, guest software can't use AER (Advanced Error
Reporting).

To use full features of PCI-Express, we need to implement Root Port
emulator into qemu, in addition to MMCONFIG.

Thank you very much.

Best Regards,

Akio Takebe

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