Virtual machine management using I/O device logging

A computer-implemented method, comprising:

• receiving, by a first server computer, a request to migrate a virtual machine running on the first server computer to a second server computer;
• copying, by the first server computer, a plurality of memory data of the virtual machine to the second server computer;
• determining, by the first server computer, that a subset of the plurality of memory data has been modified by an I/O device during the copying of the plurality of memory data performed by the first server computer,
• wherein the determination that the subset of memory has been modified is performed using an I/O logging buffer of a plurality of I/O logging buffers on the I/O device, wherein the I/O logging buffer logs traffic data elements from a communication of the I/O device over a communication channel, and
• wherein a classifier module on the I/O device determines the traffic data elements from the communication that are directed to the virtual machine and routes the determined traffic data elements to the I/O logging buffer;
• copying, by the first server computer, in response to determining that the subset of the plurality of memory data has been modified, the modified memory data to the second server computer;
• and
• halting, by the first server computer, the virtual machine, wherein the virtual machine is resumed on the second server computer.

A computing device comprising:

• a processor comprising one or more processing cores, wherein each processing core is configured to execute a respective plurality of virtual machines simultaneously and wherein each virtual machine comprises a respective plurality of computer executable instructions;
• an input/output (I/O) device operable to write data to a main memory of the computing device and comprising:
• a plurality of I/O logging buffers on the I/O device, wherein an I/O logging buffer from the plurality of I/O logging buffers on the I/O device is configured to log traffic data elements sent via the communication channel, wherein the traffic data elements include direct memory access (DMA) write requests;
• and
• a classifier module on the I/O device operable to determine that the traffic data elements from the communication are directed to a virtual machine from the plurality of virtual machines, and further operable to route the determined traffic data elements to the I/O logging buffer.