Re: kvm-tools: can't seem to set guest_mac and KVM_GET_SUPPORTED_CPUID failed.

David Evensky
2011-11-17T16:30:18Z

Avi,

evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x01 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 3
Returned entries: 31: 9995
Returned entries: 32: 1
Returned entries: 64: 1
evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x02 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 1
Returned entries: 31: 9999
evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x03 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 3
Returned entries: 31: 9995
Returned entries: 57: 1
Returned entries: 58: 1
evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x04 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
Returned entries: 31: 10000
evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..10000){ $o=`taskset 0x08 ./4sasha`; chomp($o); $histogram{$o}++}; for $o (sort keys %histogram){print "$o: $histogram{$o}\n"}'
KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 1
Returned entries: 31: 9998
Returned entries: 54: 1

\dae

On Thu, Nov 17, 2011 at 06:20:33PM +0200, Avi Kivity wrote:
> On 11/17/2011 06:12 PM, David Evensky wrote:
> >
> > evensky@waltz:~/megatux/vmatic$ perl -e 'for $cnt (1..100000){ $o=`./4sasha`; chomp($o); $histogram{$o}++}; for $o (keys %histogram){print "$o: $histogram{$o}\n"}'
> > Returned entries: 31: 99987
> > Returned entries: 56: 1
> > KVM_GET_SUPPORTED_CPUID returned -1 with errno 7: 8
> > Returned entries: 37: 4
> >
> >
>
> So it seems to be cpu migration related. But there's a get_cpu() in
> do_cpuid_ent().
>
> What happens if you change `./4sasha` to `taskset 1 ./4sasha`? or 2 4 8
> 10 20 etc?
>
> --
> error compiling committee.c: too many arguments to function
>
> --
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