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SR-IOV VF doesn't have access to MMIO registers used to determine graphics/media ID. It can however communicate with GuC. Introduce xe_device_probe_early, which initializes enough HW to use MMIO GuC communication. This will allow both VF and PF/native driver to have unified probe ordering. Signed-off-by: Michał Winiarski <michal.winiarski@intel.com> Reviewed-by: Matt Roper <matthew.d.roper@intel.com> Reviewed-by: Matthew Brost <matthew.brost@intel.com> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>