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In regard to your first inquiry, that is correct, it might be possible to accelerate the RAID system on BIOS level, the thing is that we do not have the tools to do that, since a graphical interface is needed to install the Intel® RST.
About your second question, the SSD cache is going to accelerate the virtual driver attached to the controller, but not the virtual drivers of the virtual machine, however they may take advantage of the original acceleration.
Any further questions, please let me know.