Hi Daniel,
* We need to disconnect the USB device from host: we are currently not very familiar with the kernel API to perform this
See usbconfig(8) and the detach_kernel_driver command. It's probably fine to request a user to issue that command, similar to how external commands are required to detach a PCI driver before using it for passthru in bhyve.
* We need to emulate a USB device controller: we are currently looking into pci_xhci.c and usb_mouse.c to reuse some of the code from there and we would like to know if there is some sort of in depth documentation regarding these.
pci_xhci.c is an implementation of a USB XHCI host controller so should be the place to start: it either has the functionality that is needed, or requires slight modifications.
(Lots of info and pointer to the spec at https://en.wikipedia.org/wiki/Extensible_Host_Controller_Interface)
usb_mouse.c is just an example of a USB device interface, that in turn passes through VNC mouse-movement events to the guest o/s.
* We need to pass the USB device to the guest through an emulated port of the device controller: we know that project ACRN implements USB device passthrough and we are trying to figure out how they do it.
ACRN uses libusb as the interface to USB devices on the host (see devicemodel/hw/platform/usb_pmapper.c).
later, Peter. _______________________________________________ freebsd-virtualization@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/freebsd-virtualization To unsubscribe, send any mail to "freebsd-virtualization-unsubscr...@freebsd.org"
