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

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 #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

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.


Jiri Kosina
SUSE Labs, Novell Inc.

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