KVM does not work

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https://bbs.archlinux.org – Hello, I want to use KVM to virtualize but I can't get it working. I installed the qemu-kvm package, added my user to kvm group and started the modules kvm and kvm_amd with success but when I try to start one VM it fails. # qemu-system-x86_64 failed to initialize KVM: Device or resource busy No accelerator found!# dmesg | tail [ 50.770436] kvm: enabling virtualization on CPU0 failed [ 50.770442] kvm: enabling virtualization on CPU1 failed [ 50.770459] kvm: enabling virtualization on CPU2 failedI want to attach some debug info:# uname -a Linux themissile 3.5.3-1-ARCH #1 SMP PREEMPT (HowTos)