Is there a way to trigger an interrupt from user-space?

[George Spelvin]

I'm debugging a driver, and I think an interrupt is getting lost.
Is there something under /proc or /sys that lets me say "pretend like
interrupt #x just arrived", to kick it back into life?

Basically, I want to kill(2) the kernel.

It seems like a sufficiently useful debugging hack that I thought someone
might have implemented it already, although I'm not finding mention of
it anywhere obvious.

(H'm... can the processor generate an arbitrary interrupt by writing to an
MSI address?)
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