Soo, after some digging I found the root cause, while those two KVM patches listed above were backported/added another on was not, namely:
81b1b9ca6d5ca5f3ce91c0095402def657cf5db3
KVM: VMX: Fix host initiated access to guest MSR_TSC_AUX
I backported it to this Ubuntu-4.2.0-30.35 kernel and tested it successfully.
Soo, after some digging I found the root cause, while those two KVM patches listed above were backported/added another on was not, namely: 3ce91c0095402de f657cf5db3
81b1b9ca6d5ca5f
KVM: VMX: Fix host initiated access to guest MSR_TSC_AUX
I backported it to this Ubuntu-4.2.0-30.35 kernel and tested it successfully.