Damn .. still more options missing in the stock Nvidia Jetson Nano kernel :( KVM_CAP_ARM_USER_IRQ -> needed for KVM support in qemu-system-aarch64 Initialization of device arm_gic failed: KVM with user space irqchip only works when the host kernel supports KVM_CAP_ARM_USER_IRQ
that was introduced in qemu-2.10 at https://github.com/qemu/qemu/commit/5d721b785fbe80170fc756e9444cf751d3a47568 … . if you can use older qemu (2.9?)... you may find another error maybe pmu related, -cpu host,pmu=off may help.