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# KVMX Documentation
Misc documentation on kvmx and qemu.
## USB hotplug support
* Good to have `usbutils` package in the guest.
* Docs:
* https://qemu.readthedocs.io/en/latest/system/usb.html
* https://github.com/qemu/qemu/blob/master/docs/usb2.txt
* https://wiki.gentoo.org/wiki/QEMU/Windows_guest
* https://www.linux-kvm.org/page/USB_Host_Device_Assigned_to_Guest
* https://en.wikibooks.org/wiki/QEMU/Devices/USB/Root
* https://wiki.archlinux.org/index.php/QEMU#Pass-through_host_USB_device
* Issues:
* https://serverfault.com/questions/666210/attaching-usb-dongle-to-kvm-vm
* https://unix.stackexchange.com/questions/119335/how-can-i-simulate-usb-storage-device-connection-with-qemu#119530
* https://unix.stackexchange.com/questions/452934/can-i-pass-through-a-usb-port-via-qemu-command-line#452946
kvm - Can I pass through a USB Port via qemu Command Line? - Unix & Linux Stack Exchange
* https://unix.stackexchange.com/questions/310271/camera-passthrough-in-qemu-kvm-linux-guest-machine
Camera passthrough in QEMU/KVM (linux) guest machine - Unix & Linux Stack Exchange
* https://bugs.launchpad.net/qemu/+bug/1377163/
Bug #1377163 “Does not add usb-host devices as they are hotplugg...” : Bugs : QEMU
* https://bugzilla.redhat.com/show_bug.cgi?id=955438
955438 – qemu should fail to boot guest when speed mismatch trying to attach low speed usb device to xHCI high speed controller
* https://bugs.launchpad.net/qemu/+bug/1550743
Bug #1550743 “connect low speed host devices to qemu ehci does n...” : Bugs : QEMU
* https://bugzilla.redhat.com/show_bug.cgi?id=949505
949505 – Assign 3.0 usb device to ehci and uhci or usb hub got applied anyway with warning but fails to function
* https://www.reddit.com/r/linuxadmin/comments/7a7bgl/when_adding_usb_redirection_in_a_vm_it_resets_the/
When adding USB redirection in a vm it resets the USB device and errors with speed mismatch. Any idea how to change speed? : linuxadmin
* https://bugs.launchpad.net/qemu/+bug/1810000
qemu system emulator crashed when using xhci usb controller
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