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hvm: clear vmxe if vmxoff The current Xen code keeps X86_CR4_VMXE set even if VMXON has not been executed. The stop_vmx() code assumes that it is possible to call VMXOFF if X86_CR4_VMXE is set which is not always true. Calling VMXOFF without VMXON results in an illegal opcode trap, and to avoid this condition this patch...

..._FEATURE_CONTROL_MSR, result is 0x05, so bit 0 and bit 2 are both 1. c. Set cr4.vmxe (bit13) to 1 d. Call vmx_init_vmcs_config(). This function is the same as in xen3.1.0. e. Call vmxon, passing it the physical adderss calculated in step2, using the same op-code as xen f. stop vmx by calling vmxoff. Using "while(1)", I traced and found the GP exception happened in step 4.e. >From Intel Software Development Manual 2B, I get the following conditions to throw a GP. IF (CPL > 0) or (in A20M mode) or (the values of CR0 and CR4 are supported in VMX operation) or (bit 0 (...