> > Check the errno please, thats' where the information is stored.
I looked up in the source code of xen 4.6, and find that errno 4 indicates "Interrupted system call <http://xenbits.xen.org/gitweb/?p=xen.git;a=blob;f=xen/include/public/errno.h;h=8c88bb1d40ff370c2824bb214bddfda4540528ed;hb=b24ad7ba911a9f0688ab179736476e44c52144f1#l36>", I'm not sure if it is the cause. Another information about VMFUNC error is from the Intel Manual: 25.5.5.2 General Operation of the VMFUNC Instruction > The VMFUNC instruction causes an invalid-opcode exception (#UD) if the > “enable VM functions” VM-execution > controls is 0 or the value of EAX is greater than 63 (only VM functions > 0–63 can be enable). Otherwise, the > instruction causes a VM exit if the bit at position EAX is 0 in the > VM-function controls (the selected VM function is > not enabled). If such a VM exit occurs, the basic exit reason used is 59 > (3BH), indicating “VMFUNC”, and the length > of the VMFUNC instruction is saved into the VM-exit instruction-length > field. If the instruction causes neither an > invalid-opcode exception nor a VM exit due to a disabled VM function, it > performs the functionality of the > VM function specified by the value in EAX. i.e. In conditions when guest software invoked a VM function with the VMFUNC instruction and the VM function either was not enabled or generated a function-specific condition causing a VM exit. But I've already enabled VM function and the conditions described in the manual are not true (EAX is 0), so I'm still not clear the real reason
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