我有戴尔OPTIPLEX 755机器在VT中启用了VT，但是当我试图检查使用KVM我得到以下错误

我错过了什么？

root@nova-controller:~# kvm-ok INFO: /dev/kvm does not exist HINT: sudo modprobe kvm_intel INFO: Your CPU supports KVM extensions INFO: KVM (vmx) is disabled by your BIOS HINT: Enter your BIOS setup and enable Virtualization Technology (VT), and then hard poweroff/poweron your system KVM acceleration can NOT be used root@nova-controller:~# 

更新：

 root@nova-controller:~# sudo modprobe kvm_intel FATAL: Error inserting kvm_intel (/lib/modules/3.2.0-26-generic/kernel/arch/x86/kvm/kvm-intel.ko): Operation not supported 

dmesg的

 [ 57.887352] kvm: disable TXT in the BIOS or activate TXT before enabling KVM [ 57.887354] kvm: disabled by bios [ 61.199353] kvm: disable TXT in the BIOS or activate TXT before enabling KVM [ 61.199355] kvm: disabled by bios [ 965.566334] kvm: disable TXT in the BIOS or activate TXT before enabling KVM [ 965.566337] kvm: disabled by bios 

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