Hi Gleb and Paolo, When I write test cases for nested virt and found that reading/writing IA32_FEATURE_CONTROL will be simply ignored or return 0 (in arch/x86/kvm/vmx.c) in VM. Checking this MSR will be done by some hypervisors (e.g. NOVA) and may cause error then, so it is necessary to behave right when read/write it in VM. Are there any difficulties to handle this MSR? I have two solutions. The first one is return the value of physical CPU's and always return true when write. This is simple but may behave as if it is a VM because write to it after VMXON will not return GP exception. This solution can solve most basic problems since this MSR is not commonly used. Another solution is adding a field in VCPU to handle this MSR. This is a complex but better method. I think I can complete this if needed. Thanks, Arthur -- Arthur Chunqi Li Department of Computer Science School of EECS Peking University Beijing, China -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
