On Tue, Jul 02, 2019 at 06:53:58PM -0700, Sai Praneeth Prakhya wrote:
> Assume a use case where-in the priviliged user would want to use the device in
> pass-through mode when the device is used for host but would want to switch to
> dma protected mode when switching for VFIO in user space. Presently, this is
> not
> supported and hence add support to change default domain of a group
> dynamically.
VFIO does it's own iommu magic with the device and moves the group out
of the default domain, so that doesn't sound like a valid use-case. More
valid would be something like putting a device into passthrough mode to
improve performance, or do you have other valid use-cases in mind?
Regards,
Joerg
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