[Linuxarm] Re: [RFC PATCH 2/3] vfio/hisilicon: register the driver to vfio

On Thu, May 13, 2021 at 12:22:32PM -0600, Alex Williamson wrote:

If you expect this device to appear only as an integrated endpoint, then I think Jason's suggestion above is correct. Your driver that supports migration can refuse to load for devices there the topology is other than expected and you're effectively guaranteeing DMA isolation of the user and in-kernel drivers by hardware DMA semantics and topology.

Some kind of VFIO api 'vfio_is_this_pci_dev_is_safe_to_share()' seems appropriate here.

I saw Intel doing the same thing in one of their VDPA driver proposals.

Jason