Add some notes for myself
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### USB passthrough notes
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#### USB 3.0 flash drive
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The following USB configuration works for usb passthrough of a USB 3.0 flash
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drive to Fedora 25 guest.
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-device nec-usb-xhci,id=xhci \
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-device usb-host,bus=xhci.0,vendorid=0x0781,productid=0x5590 \
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-usb -device usb-mouse,bus=usb-bus.0 -device usb-kbd,bus=usb-bus.0 \
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...
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#### Moto G3 phone
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The following USB configuration works for usb passthrough of a Moto G3 phone to
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Fedora 25 guest.
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-device usb-host,bus=usb-bus.0,vendorid=0x22b8,productid=0x002e \
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-usb -device usb-mouse,bus=usb-bus.0 -device usb-kbd,bus=usb-bus.0 \
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...
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#### CoolerMaster keyboard
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The following USB configuration works for usb passthrough of a CoolerMaster
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keyboard to macOS Sierra guest!
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-device usb-host,bus=usb-bus.0,vendorid=0x2516,productid=0x0004 \
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-usb -device usb-tablet,bus=usb-bus.0 -device usb-kbd,bus=usb-bus.0 \
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...
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#### Virtual USB disk
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The following USB configuration works for attaching a virtual USB disk to macOS
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Sierra guest. Use "qemu-img" to create "disk.raw" virtual disk.
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-drive if=none,id=usbstick,file=disk.raw,format=raw \
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-device usb-storage,bus=usb-bus.0,drive=usbstick \
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...
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However USB passthrough of EHCI, and XHCI (USB 3.0) devices does not work with
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macOS Sierra. See https://bugs.launchpad.net/qemu/+bug/1509336 for
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confirmation. According to this bug report, USB passthrough does not work with
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versions >= Mac OS X El Capitan guests.
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It seems that this problem can be fixed by using OVMF + Clover.
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Update: OVMF + Clover doesn't help. It seems that macOS is missing the required
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drivers for the EHCI, and XHCI controllers that are exposed by QEMU.
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