[RFC PATCH kernel 0/5] powerpc/P9/vfio: Pass through NVIDIA Tesla V100

[Benjamin Herrenschmidt]

On Thu, 2018-06-07 at 18:34 -0600, Alex Williamson wrote:
> > We *can* allow individual GPUs to be passed through, either if somebody
> > designs a system without cross links, or if the user is ok with the
> > security risk as the guest driver will not enable them if it doesn't
> > "find" both sides of them.
> 
> If GPUs are not isolated and we cannot prevent them from probing each
> other via these links, then I think we have an obligation to configure
> grouping in a way that doesn't rely on a benevolent userspace.  Thanks,

Well, it's a user decision, no ? Like how we used to let the user
decide whether to pass-through things that have LSIs shared out of
their domain.

Cheers,
Ben.