I have Qemu 4.2.0 with Debian Testing Bullseye and Kernel 5.4.0 and I need to hotplug and unplug an USB device.
Currently I attach my USB device with
qemu... -usb -device usb-host,hostbus=x,hostaddr=y
but when I physically remove the device I can't longer detect it from within the VM (Win7).
So, what should I do to send a plug/unplug usb signal to the virtual machine??
You can do plug/unplug via qemu monitor. see https://en.wikibooks.org/wiki/QEMU/Monitor.
To hot plug a usb device, type bellow in qemu monitor:
(qemu) device_add usb-host,hostbus=2,hostport=1.2.2,id=idofyourdevice
To remove a usb device, type below in qemu monitor:
(qemu) device_del idofyourdevice