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PCI-passthrough support for gaming is pretty niche (I say this having set it up myself), and I can understand vendors not wanting to support it. Those support tickets would be a pain.

Gaming VMs are likely going to die anyway, at least for competitive gaming. Virtualization is just too powerful a tool for cheating. Many anti-cheats already ban it.

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Anti-cheat software, even those that run in ring 0, can always be lied to by another program, even without a VM. Just look at how deep the Sony root kit [1] buried itself into systems and was still easily circumvented by other software. If anything gaming in VMs makes cheating harder and if NVidia, intel and Microsoft worked together they could help publishers ship secure VMs to run games reducing support tickets and cheats.

1. https://en.wikipedia.org/wiki/Extended_Copy_Protection

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