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bhyve: export funcs for read/write pci config

Authored by corvink on Jan 6 2022, 2:14 PM.
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Export functions for reading and writing the pci config space from passthru device to be used by other devices. This is required for lpc devices to set their vendor/device ids to their physical values. Otherwise, GPU passthrough for integrated Intel GPUs won't work properly.

See D28280

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rG FreeBSD src repository
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