Linux: Simulate MMIO with userfaultfd()

Question

Linux: Simulate MMIO with userfaultfd()

mdavidsaver opened this issue 5 years ago · 1 comments

I think it would be possible to use the Linux userfaultfd() mechanism to enable in-process simulation of MMIO devices (as opposed to eg. QEMU models). Might be helpful in driver unit testing.

Answer 1 · 2021-06-28T13:41:27.000Z

Turns out this isn't possible. The value being written is not available to the fault handler.