USB Raw Gadget (an interface that allows to emulate USB devices through the USB Gadget subsystem) has been merged into mainline: git.kernel.org/pub/scm/linux/
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See more details and a usage example here:
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Raw Gadget is what's been powering syzbot/syzkaller's fuzzing of the Linux kernel USB subsystem, with almost 200 bugs reported at this point: syzkaller.appspot.com/upstream?manag
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Implemented a test suite for Raw Gadget, something that's rarely done for kernel interfaces:
github.com/xairy/raw-gadg
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wheee! I wonder whether it's possible to convince Android OEMs to start using that instead of hacking up their own kernel code for their weird custom file transfer USB gadgets...
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Awesome! is there something similar for emulating PCI devices? or is the PCI subsystem too low on the stack to do such a thing? I believe the only solutions i've seen are in the form of devices emulated through qemu
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There are hardware based solutions, but I'm not aware of any implemented solutions for emulating PCI devices within the kernel. Would love to know if something like this exists