Transmitting Data on a Session

When a guest operating system needs to transmit data to an external debugger, the guest calls the HvPostDebugData hypercall function to post the data to the session. The hypervisor sends the posted data to the host system asynchronously (for serial debugging) or synchronously (for 1394 debugging) to the host system. The hypervisor buffers the outgoing data by using the buffer space that was allocated for the session when the partition was initialized. If there is insufficient free space available for all of the data, the hypervisor returns an error and does not post any data.

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Build date: 11/16/2013