On AMD/SVM the hypervisor will inject #UD when userland tries to
execute the vmmcall instruction. Same holds for vmgexit which is
encode as "rep vmmcall".

On Intel/VMX vmmcall and vmgexit are invalid instructions, so the
CPU will raise #UD.

ok mlarkin@

On Intel/VMX the hypervisor will inject #UD when userland tries to
execute the vmcall instruction.

On AMD/SVM vmcall is an invalid instruction, so the CPU will raise

ok mlarkin@

While there fix typo in a debug printf.

ok mlarkin@

ok mlarkin@