Re: [Qemu-devel] [PATCH 3/3] KVM: use KVM_CAP_MAX_VCPU_ID

[Paolo Bonzini <pbonzini@redhat.com>]

On 13/06/2016 10:42, Greg Kurz wrote:
> On Fri, 27 May 2016 13:16:49 +0200
> Greg Kurz <gkurz@linux.vnet.ibm.com> wrote:
> 
>> On Fri, 27 May 2016 13:58:28 +1000
>> David Gibson <david@gibson.dropbear.id.au> wrote:
>>
>>> On Thu, May 26, 2016 at 10:02:23AM +0200, Greg Kurz wrote:  
>>>> As stated in linux/Documentation/virtual/kvm/api.txt:
>>>>
>>>> The maximum possible value for max_vcpu_id can be retrieved using the
>>>> KVM_CAP_MAX_VCPU_ID of the KVM_CHECK_EXTENSION ioctl() at run-time.
>>>>
>>>> If the KVM_CAP_MAX_VCPU_ID does not exist, you should assume that
>>>> max_vcpu_id is the same as the value returned from KVM_CAP_MAX_VCPUS.
>>>>
>>>> Signed-off-by: Greg Kurz <gkurz@linux.vnet.ibm.com>    
>>>
>>> Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
>>>   
>>
>> Paolo,
>>
>> FYI Patch 1/3 was in David's pull request earlier today. It is now upstream.
>>
>> You may now apply 2/3 and 3/3.
>>
>> Thanks !
>>
> 
> Hi Paolo,
> 
> Just a friendly reminder. Without this patch, we cannot create more than
> 128 single-threaded vCPUs on POWER8 if the host has unsplit cores.

Thanks!

Paolo