[libvirt] virDomainGetVcpus error with Fedora 10
Kaitlin Rupert
kaitlin at linux.vnet.ibm.com
Thu Mar 19 23:08:02 UTC 2009
>>>>> I tracked this down, and it's failing the if (cpumaps != NULL &&
>>>>> maplen < 1) check in libvirt.c because cpumaps is non-NULL. Which
>>>>> is very strange because I'm definitely passing a NULL value.
>>>> The qemud/remote.c helper for the virDomainGetVcpus method is just
>>>> doing a totally bogus calculation/allocation for the cpumaps field.
>>>> It needs fixing somehow, but I'm not sure how yet
>>> Any update on this?
>>
>> I've had another look at it, and believe I have a suitable fix. There
>> were
>> two problems.
>> - Not allocating a large enough array for the cpumaps field
>> - Not respecting a cpumaplen=0, as meaning pass cpumaps=NULL
>>
>> The latter is what was causing the error message you saw I believe. Can
>> you try the following patch
>
> +1 (although, i think this is already upstream, sorry for the slow
> response).
>
> I am seeing a new issue now. After calling
> virDomainSetSchedulerParameters() on a KVM guest, virDomainGetVcpus()
Oops, the virDomainSetSchedulerParameters() here was a typo.
Anyway, I tracked this issue down to a conflicting install of libvirt on
the system. After removing all versions of libvirt and reinstalling,
this is no longer any issue.
--
Kaitlin Rupert
IBM Linux Technology Center
kaitlin at linux.vnet.ibm.com
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