[PATCH RFC/RFT] vfio/pci: Create feature to disable MSI virtualization

[David Woodhouse]

On Fri, 2025-01-03 at 10:31 -0400, Jason Gunthorpe wrote:
> 
> IIRC Alex had a patch series for qemu to capture and rewrite the ath
> non-standard MSI locations, so virtualization worries should not block
> moving ath to use the device-specific MSI..

In the absence of the IOMMU in our shared fantasy, this seems like the
best approach.

Even for passed-through PCI hardware, the config space is largely a
fiction. As are the MSI(-X) vectors. So although it's a device-specific
quirk, this seems like the best approach.

Probably best for the hypervisor to have some way to *advertise* that
it's handling this though, as guests also might want to run on
hypervisors which don't.
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