[svsm-devel] vTPM send command extension

[Dionna Amalie Glaze]

On the topic of updating the SVSM reference, we discussed in the
developer's call today that we really do need for the
VTPM_SEND_COMMAND call to make the buffer length known to the SVSM,
because there's not enough information in the input for SVSM to make
the determination that the given buffer is large enough to receive the
response.

I propose VTPM_SEND_COMMAND_EX, where everything is the same except
RDX contains the number of contiguous pages starting from RCX that are
available to use in the response.
We ought to update the original send command to limit the buffer size
to a page for safety.


-- 
-Dionna Glaze, PhD, CISSP, CCSP (she/her)