``` Host: Void Linux (5.8.18_1 kernel) Guest: macOS Catalina (10.15.7) qemu-x86_64 version: 5.1.0 ``` After upgrading to libvirt 6.9.0, the macOS guest still successfully boots, but USB-passthrough devices _(wired keyboard and generic USB Bluetooth dongle for mouse)_ no longer respond. In this case, the USB-passthrough devices still appear in the macOS IORegistry, but don't function. Downgrading to solely the libvirt package to 6.6.0 _(I don't have ready access to older 6.7.0 or 6.8.0 packages, as they were never installed on this system)_ restores mouse and keyboard function. I don't find anything noteworthy in `/var/log/libvirt/qemu/<guestname>.log`, except confirmation that the qemu version did _not_ change at the time libvirt 6.9.0 was installed. Googling this issue, I've found a similar-sounding [Reddit thread](https://www.reddit.com/r/VFIO/comments/jxqm5c/usb_passthrough_not_working_anymore_after_latest) which points to a related [Gentoo thread](https://bugs.gentoo.org/753305); in those cases, however, the host OS is Windows 10. I'm happy to gather whatever additional information might be of help. **Edit:** Interestingly, I see libvirt 6.6.0 is generating USB passthrough arguments like this: ``` -device usb-host,hostbus=9,hostaddr=3... ``` And those generated by libvirt 6.9.0 use this form: ``` -device usb-host,hostdevice=/dev/bus/usb/010/003... ``` **Edit 2:** Another observation: I just discovered that even the EFI-based bootloader _(Clover, based on rEFIt)_ doesn't see keyboard activity, so things have gone wrong even before macOS starts to load.