Yes, I tried running as root. I also tried it on a different computer that is running Mac OS 10.13, and it gave the same errors.
-- You received this bug notification because you are a member of qemu- devel-ml, which is subscribed to QEMU. https://bugs.launchpad.net/bugs/1850570 Title: Cannot use usb-host on Mac OS Status in QEMU: New Bug description: Usb-host will not work on Mac OS 10.15. Qemu runs, though it gives these errors and the drive does not show up. Also, when Qemu is starting the drive ejects and remounts twice. Qemu built with ./configure --target-list=i386-softmmu,x86_64-softmmu --enable-sdl --disable-cocoa --enable-sdl-image. qemu-system-i386 image.qcow -usb -device usb-kbd -device usb-host,vendorid=0x0781,productid=0x5571 libusb: error [darwin_claim_interface] USBInterfaceOpen: another process has device opened for exclusive access libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] USBInterfaceOpen: another process has device opened for exclusive access libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found libusb: error [darwin_claim_interface] interface not found To manage notifications about this bug go to: https://bugs.launchpad.net/qemu/+bug/1850570/+subscriptions
