HV_X64_MSR_HYPERCALL_AVAILABLE 259 arch/x86/hyperv/hv_init.c required_msrs = HV_X64_MSR_HYPERCALL_AVAILABLE | HV_X64_MSR_HYPERCALL_AVAILABLE 1848 arch/x86/kvm/hyperv.c ent->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;