What:		/sys/hypervisor/type
Date:		April 2020
KernelVersion:	5.4.25
Description:	If running under Haven:
		Type of hypervisor:
		"haven": Haven hypervisor

What:		/sys/hypervisor/version/api
Date:		April 2020
KernelVersion:	5.4.25
Description:	If running under Haven:
		The Haven API version.

What:		/sys/hypervisor/version/variant
Date:		April 2020
KernelVersion:	5.4.25
Description:	If running under Haven:
		The Haven variant (build) version.

What:		/sys/kernel/debug/haven/trace_set
Date:		April 2020
KernelVersion:	5.4.25
Description:	If running under Haven with Trace Control support:
		When reading, gets active trace class flags as a hexadecimal.
		When writing, adds to the trace class flags.

What:		/sys/kernel/debug/haven/trace_clear
Date:		April 2020
KernelVersion:	5.4.25
Description:	If running under Haven with Trace Control support:
		When reading, gets active trace class flags as a hexadecimal.
		When writing, clears the specified trace class flags.
