torvalds/linux

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