Re: [Qemu-devel] [PATCH v4 13/54] plugin: add user-facing API

[Aaron Lindsay OS]

One thing I would find useful is the ability to access register values
during an execution-time callback. I think the easiest way to do that
generically would be to expose them via the gdb functionality (like
Pavel's earlier patchset did [1]), though that (currently) limits you to
the general-purpose registers. Ideally it would be nice be able to
access other registers (i.e. floating-point, or maybe even system
registers), though those are more difficult to do generically.

Perhaps if we added some sort of architectural-support checking for
individual plugins like I mentioned in another response to this
patchset, we could allow some limited architecture-specific
functionality in this vein? I confess I haven't thought through all the
ramifications of that yet, though. 

-Aaron

[1] - See qemulib_read_register() at
      https://patchwork.ozlabs.org/patch/925393/