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Re: [Qemu-ppc] [PATCH 3/3] KVM: use KVM_CAP_MAX_VCPU_ID
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-ppc] [PATCH 3/3] KVM: use KVM_CAP_MAX_VCPU_ID |
Date: |
Mon, 13 Jun 2016 13:25:51 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.1.0 |
On 13/06/2016 10:42, Greg Kurz wrote:
> On Fri, 27 May 2016 13:16:49 +0200
> Greg Kurz <address@hidden> wrote:
>
>> On Fri, 27 May 2016 13:58:28 +1000
>> David Gibson <address@hidden> 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 <address@hidden>
>>>
>>> Reviewed-by: David Gibson <address@hidden>
>>>
>>
>> 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