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    SubjectKVM warning about uncertified CPU for SMP for AMD model 2, stepping 3
    Hi,

    booting 32bit guest on 32bit host on AMD system gives me the following
    warning when KVM is instructed to boot as SMP:



    CPU0: AMD QEMU Virtual CPU version 0.9.1 stepping 03
    Booting Node 0, Processors #1
    Initializing CPU#1
    Leaving ESR disabled.
    Mapping cpu 1 to node 0
    ------------[ cut here ]------------
    WARNING: at linux-2.6.32/arch/x86/kernel/cpu/amd.c:187 init_amd_k7+0x178/0x187()
    Hardware name:
    WARNING: This combination of AMD processors is not suitable for SMP.
    Modules linked in:
    Pid: 0, comm: swapper Not tainted 2.6.32.9-0.5-pae #1
    Call Trace:
    [<c02069a1>] try_stack_unwind+0x1b1/0x1f0
    [<c020596f>] dump_trace+0x3f/0xe0
    [<c02065ab>] show_trace_log_lvl+0x4b/0x60
    [<c02065d8>] show_trace+0x18/0x20
    [<c052dc19>] dump_stack+0x6d/0x74
    [<c023ebbf>] warn_slowpath_common+0x6f/0xd0
    [<c023ec6b>] warn_slowpath_fmt+0x2b/0x30
    [<c052875c>] init_amd_k7+0x178/0x187
    [<c052896f>] init_amd+0x138/0x279
    [<c0527d74>] identify_cpu+0xc2/0x223
    [<c0527ee1>] identify_secondary_cpu+0xc/0x1a
    [<c052b3bc>] smp_callin+0xd4/0x1a1
    [<c052b493>] start_secondary+0xa/0xe7



    The virtual CPU identifies itself as cpu family 6, model 2, stepping 3 in
    /proc/cpuinfo.

    Model 2 is indeed not handled by amd_k7_smp_check() and thus this warning
    is spit out.

    Is that correct? Model 2 refers to Pluto/Orion (K75) if I remember
    correctly, right? That one is not oficially certified for SMP by AMD?

    If it is not, maybe KVM should better emulate different CPU for
    SMP-enabled configurations, right?
    On the other hand, if it is certified (I have no idea), amd_k7_smp_check()
    should handle this model properly.

    Thanks,

    --
    Jiri Kosina
    SUSE Labs, Novell Inc.


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