if:

    qemu-kvm -m 1024 -drive format=raw,file=/dev/sda

(hardware not supported)
Could not access KVM kernel module: No such file or directory
qemu-system-x86_64: failed to initialize KVM: No such file or directory

then an slower option:

    qemu-system-x86_64 -drive format=raw,file=/dev/sda