1. An apparatus comprising: one or more computer readable storage media; program instructions stored on the one or more computer readable media that, when executed by a processing system to facilitate accelerated input and output with respect to a virtual environment, direct the processing system to at least: upon being notified of a guest read process initiated by a first processing job running in a first virtual machine on a host system to read data into a location in guest memory associated with the first processing job, identify a location in host memory associated with the location in the guest memory, wherein the first processing job is also running in a second virtual machine on the host system; coordinate an amount of host memory used by the first processing job across the first virtual machine and the second virtual machine; and initiate a host read process to read the data into the location in the host memory that corresponds to the location in the guest memory.