Virtualization

To make a USB Host Device optional on startup within KVM, edit the XML and add startupPolicy="optional" to the source node. This will ensure your usb stick, yubikey, or whatever, it won’t stop your VM from booting if it isn’t present. Example: <hostdev mode="subsystem" type="usb" managed="yes"> <source startupPolicy="optional"> <vendor id="0x1050"/> <product id="0x0402"/> </source> <address type="usb" bus="0" port="4"/> </hostdev>

Received a BSOD with error code 0xc0000225 on a Windows 10 (and 11) VM when enabling the Hyper-V role to do some testing with Microsoft Defender Application Guard. This VM runs on a Rocky Linux host and I typically use Virt-Manager to handle my VMs. Two changes were necessary to get nested Hyper-V working with virt-manager: virt-xml <VM-NAME> --edit --cpu host-passthrough sudo modprobe kvm\_intel nested=1 Note: kvm\_amd for AMD processors