Cannoli: The Fast QEMU Tracer

Re:Cannoli: The Fast QEMU Tracer by gamozolabs on Friday May 27, 2022 @03:17AM (#31526876)

I put some thought into that, unfortunately I had some issues with writing these hooks in QEMU TCG itself. That's what I originally did, such that it was JIT-target agnostic, but unfortunately I couldn't get the register stuff to work correctly? Idk, probably an assumption of the QEMU TCG implementation I didn't allow.

I don't think they'd want it if it's specific to one target arch. Idk. In theory the hooks into QEMU are target agnostic, there's no assembly on the QEMU side, only in the Cannoli server side (shared library).

I had it working target agnostic if I did memory accesses from the JIT, but it "didn't work" when I tried to put my data in registers (eg. the only generic implementation I used caused 2 extra memory accesses per target instruction, which is brutal at these speeds)

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Re:Cannoli: The Fast QEMU Tracer by solarengineer on Friday May 27, 2022 @10:27AM (#31530039)

Perhaps you want to check with the Qemu devs? They may have advice on what work would be needed regardless of whether they accept your contribution or not, and additionally what they'd want to see in order to accept your contribution.

In any case, thank you for such a nice creation!

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