Microsoft Technology Licensing, LLC

Liang Yang

Martijn De Kort

Matthew David Kurjanowicz

Murtaza Ghiya

Scott Chao-Chueh Lee

Robin Andrew Alexander

Yimin Deng

Xiaozhong Xing

Lei Kou

Vishal Jose Mannanal

HoYuen Chau

Danyu Zhu

Monish Shantilal Shah

Ho-Yuen Chau

Hoyuen Chau

Chin Hwan Park

Techniques of implementing software filtered non-volatile memory in a computing device are disclosed herein. In one embodiment, a method includes detecting an entry being written to a guest admin submission queue (gASQ) by a memory driver of a virtual machine hosted on the computing device. Upon detecting the entry written to the gASQ by the memory driver, the command in the entry is analyzed to determine whether the command is allowed based on a list of allowed or disallowed commands. In response to determining that the command in the entry is not allowed, without sending the command to the non-volatile memory, generating an execution result of the command in response to the entry being written to the gASQ by the memory driver. As such, potentially harmful commands from the memory driver are prevented from being executed by the non-volatile memory.

Software filtered memory devices in computing systems

The disclosed technologies provide functionality for non-volatile memory device-assisted live migration of virtual machine ('VM') data. A host computing device (the “host”) requests that a source non-volatile memory device track changes to a namespace by a VM. In response thereto, the source device tracks changes made by the VM to the namespace and stores one or more data structures that identify the changed portions of the namespace. The host requests the data structures from the source device and requests the contents of the changed portions from the source device. The host then causes the data changed by the VM in the namespace to be written to a namespace on a target non-volatile memory device. The host can also retrieve the device internal state of a child physical function on the source device. The host migrates the retrieved device internal state to a child physical function on the target device.

Non-volatile memory device-assisted live migration of virtual machine data

The disclosed technologies include functionality for managing Multiple Physical Function NVMe Devices ('MFNDs') and the physical functions ('PFs') provided by MFNDs. For example, host devices can discover MFNDs, query the capabilities of MFNDs, and change the operating mode of an MFND between a user mode and a super administrator mode. Hosts can also utilize the disclosed technologies to create and delete individual child PFs on MFNDs. The disclosed technologies also include functionality for managing the settings associated with individual PFs of MFNDs. For example, hosts can query and modify the settings associated with individual child PFs of an MFND. The disclosed technologies also include functionality for managing the QoS provided by individual PFs of a MFND. For example, hosts can also query and modify the QoS provided by individual child PFs of an MFND.

Management of multiple physical function nonvolatile memory devices

An I/O processing system includes reception of a request to perform an I/O operation from a user-mode application, providing of the request to a storage device, scheduling of an operating system deferred procedure call to determine whether the storage device has completed the I/O operation, execution of the scheduled deferred procedure call to determine that the storage device has completed the I/O operation, and transmission of a return corresponding to the completed I/O operation to the user-mode application.

I/O completion polling for low latency storage device

An I/O processing system includes reception of a request to perform an I/O operation at a storage driver, and, in response to receiving the request, providing of the request to a storage device, and scheduling a timer associated with a callback routine to determine whether the storage device has completed the I/O operation, and, in response to expiration of the scheduled timer, determination of whether the storage device has completed the I/O operation.

Timer-based I/O completion polling for low latency storage device

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Redmond, WA, United States of America

Liang Yang