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Docker isn't a hypervisor...

Maybe that's why he thinks Docker is unstable.

>Xen is dead

Other than that whole AWS thing...

And IBM/SoftLayer...

Which doesn't really count. Its fine AWS uses Xen, they have the budget and the team to maintain their fork, warts and all.

Looks like KVM has poor support for PCI passthrough for GPU (e.g. OpenGL and CUDA)

I disagree. KVM has the best and most flexible passthough support that I've used.

Successfully running Windows 10 on top of Arch, with my GTX 970 passed though. Works without a hitch.