Comment 5 for bug 1828495

This patch is also needed for kernels before 4.18

  cd28325249 KVM: VMX: support MSR_IA32_ARCH_CAPABILITIES as a feature MSR ( 25-6-18)

This patchset populates the structure in arch/x86/kvm/x86.c:
   msr_based_features{}

With out this patch, qemu asserts at

  kvm_get_supported_feature_msrs(KVMState *s):
         assert(msr_list.nmsrs > 0);