What:		/sys/bus/vmbus/hibernation
Date:		Jan 2021
KernelVersion:	5.12
Contact:	Dexuan Cui <decui@microsoft.com>
Description:	Whether the host supports hibernation for the VM.
Users:		Daemon that sets up swap partition/file for hibernation.

What:		/sys/bus/vmbus/devices/<UUID>/id
Date:		Jul 2009
KernelVersion:	2.6.31
Contact:	K. Y. Srinivasan <kys@microsoft.com>
Description:	The VMBus child_relid of the device's primary channel
Users:		tools/hv/lsvmbus

What:		/sys/bus/vmbus/devices/<UUID>/class_id
Date:		Jul 2009
KernelVersion:	2.6.31
Contact:	K. Y. Srinivasan <kys@microsoft.com>
Description:	The VMBus interface type GUID of the device
Users:		tools/hv/lsvmbus

What:		/sys/bus/vmbus/devices/<UUID>/device_id
Date:		Jul 2009
KernelVersion:	2.6.31
Contact:	K. Y. Srinivasan <kys@microsoft.com>
Description:	The VMBus interface instance GUID of the device
Users:		tools/hv/lsvmbus

What:		/sys/bus/vmbus/devices/<UUID>/channel_vp_mapping
Date:		Jul 2015
KernelVersion:	4.2.0
Contact:	K. Y. Srinivasan <kys@microsoft.com>
Description:	The mapping of which primary/sub channels are bound to which
		Virtual Processors.
		Format: <channel's child_relid:the bound cpu's number>
Users:		tools/hv/lsvmbus

What:		/sys/bus/vmbus/devices/<UUID>/device
Date:		Dec. 2015
KernelVersion:	4.5
Contact:	K. Y. Srinivasan <kys@microsoft.com>
Description:	The 16 bit device ID of the device
Users:		tools/hv/lsvmbus and user level RDMA libraries

What:		/sys/bus/vmbus/devices/<UUID>/vendor
Date:		Dec. 2015
KernelVersion:	4.5
Contact:	K. Y. Srinivasan <kys@microsoft.com>
Description:	The 16 bit vendor ID of the device
Users:		tools/hv/lsvmbus and user level RDMA libraries

What:		/sys/bus/vmbus/devices/<UUID>/numa_node
Date:		Jul 2018
KernelVersion:	4.19
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	This NUMA node to which the VMBUS device is
		attached, or -1 if the node is unknown.

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Directory for per-channel information
		NN is the VMBUS relid associated with the channel.

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/cpu
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	VCPU (sub)channel is affinitized to
Users:		tools/hv/lsvmbus and other debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/in_mask
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Host to guest channel interrupt mask
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/latency
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Channel signaling latency. This file is available only for
		performance critical channels (storage, network, etc.) that use
		the monitor page mechanism.
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/out_mask
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Guest to host channel interrupt mask
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/pending
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Channel interrupt pending state. This file is available only for
		performance critical channels (storage, network, etc.) that use
		the monitor page mechanism.
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/read_avail
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Bytes available to read
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/write_avail
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Bytes available to write
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/events
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Number of times we have signaled the host
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/interrupts
Date:		September. 2017
KernelVersion:	4.14
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Number of times we have taken an interrupt (incoming)
Users:		Debugging tools

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/subchannel_id
Date:		January. 2018
KernelVersion:	4.16
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Subchannel ID associated with VMBUS channel
Users:		Debugging tools and userspace drivers

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/monitor_id
Date:		January. 2018
KernelVersion:	4.16
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Monitor bit associated with channel. This file is available only
		for performance critical channels (storage, network, etc.) that
		use the monitor page mechanism.
Users:		Debugging tools and userspace drivers

What:		/sys/bus/vmbus/devices/<UUID>/channels/<N>/ring
Date:		January. 2018
KernelVersion:	4.16
Contact:	Stephen Hemminger <sthemmin@microsoft.com>
Description:	Binary file created by uio_hv_generic for ring buffer
Users:		Userspace drivers

What:           /sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_in_full
Date:           February 2019
KernelVersion:  5.0
Contact:        Michael Kelley <mikelley@microsoft.com>
Description:    Number of guest to host interrupts caused by the inbound ring
		buffer transitioning from full to not full while a packet is
		waiting for buffer space to become available
Users:          Debugging tools

What:           /sys/bus/vmbus/devices/<UUID>/channels/<N>/intr_out_empty
Date:           February 2019
KernelVersion:  5.0
Contact:        Michael Kelley <mikelley@microsoft.com>
Description:    Number of guest to host interrupts caused by the outbound ring
		buffer transitioning from empty to not empty
Users:          Debugging tools

What:           /sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_first
Date:           February 2019
KernelVersion:  5.0
Contact:        Michael Kelley <mikelley@microsoft.com>
Description:    Number of write operations that were the first to encounter an
		outbound ring buffer full condition
Users:          Debugging tools

What:           /sys/bus/vmbus/devices/<UUID>/channels/<N>/out_full_total
Date:           February 2019
KernelVersion:  5.0
Contact:        Michael Kelley <mikelley@microsoft.com>
Description:    Total number of write operations that encountered an outbound
		ring buffer full condition
Users:          Debugging tools
