Randy Dunlap wrote: >> Index: kvm/arch/s390/kernel/early.c >> =================================================================== >> --- kvm.orig/arch/s390/kernel/early.c >> +++ kvm/arch/s390/kernel/early.c >> @@ -143,6 +143,10 @@ static noinline __init void detect_machi >> /* Running on a P/390 ? */ >> if (cpuinfo->cpu_id.machine == 0x7490) >> machine_flags |= 4; >> + >> + /* Running under KVM ? */ >> + if (cpuinfo->cpu_id.version == 0xfe) > > Hi, > > Where are these magic numbers documented? (0x7490, 0xfe, etc.) > > >> + machine_flags |= 64; >> } >> >> #ifdef CONFIG_64BIT The cpuid (and most other things about s390 arch) are documented in the principles of operation: http://publibz.boulder.ibm.com/epubs/pdf/a2278324.pdf http://publibz.boulder.ibm.com/epubs/pdf/dz9zs001.pdf (see chapter "control instructions" - store cpu id) The 0xfe however is convention, the kvm arch code sets this value where it implements that instruction. See "privileged instructions" patch. _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/virtualization
