Re: [PATCH 1/4] KVM: Provide function for VCPU lookup by id

[Thomas Huth]

On 19/11/15 09:37, Christian Borntraeger wrote:
> From: David Hildenbrand 
> 
> Let's provide a function to lookup a VCPU by id.
> 
> Reviewed-by: Christian Borntraeger 
> Reviewed-by: Dominik Dingel 
> Signed-off-by: David Hildenbrand 
> Signed-off-by: Christian Borntraeger 
> [split patch from refactoring patch]
> ---
>  include/linux/kvm_host.h | 11 +++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 5706a21..b9f345f 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -460,6 +460,17 @@ static inline struct kvm_vcpu *kvm_get_vcpu(struct kvm 
> *kvm, int i)
>(vcpup = kvm_get_vcpu(kvm, idx)) != NULL; \
>idx++)
>  
> +static inline struct kvm_vcpu *kvm_lookup_vcpu(struct kvm *kvm, int id)
> +{
> + struct kvm_vcpu *vcpu;
> + int i;
> +
> + kvm_for_each_vcpu(i, vcpu, kvm)
> + if (vcpu->vcpu_id == id)
> + return vcpu;
> + return NULL;
> +}
> +

Any chance that you name this function differently? Otherwise we've got
two functions that sound very similar and also have similar prototypes:

- kvm_get_vcpu(struct kvm *kvm, int i)
- kvm_lookup_vcpu(struct kvm *kvm, int id)

I'm pretty sure this will cause confusion in the future!
==> Could you maybe name the new function something like
"kvm_lookup_vcpu_by_id" or "kvm_get_vcpu_by_id" instead?

Also a short comment before the function would be nice to make the
reader aware of the difference (e.g. when hot-plugging) between the
vcpu-id and array-id.

Otherwise: +1 for finally having a proper common function for this!

 Thomas

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Re: [PATCH 1/4] KVM: Provide function for VCPU lookup by id

[David Hildenbrand]

> 
> Any chance that you name this function differently? Otherwise we've got
> two functions that sound very similar and also have similar prototypes:
> 
> - kvm_get_vcpu(struct kvm *kvm, int i)
> - kvm_lookup_vcpu(struct kvm *kvm, int id)
> 
> I'm pretty sure this will cause confusion in the future!
> ==> Could you maybe name the new function something like
> "kvm_lookup_vcpu_by_id" or "kvm_get_vcpu_by_id" instead?

Had that in a previous version but decided to name it that way ... hmm ...
other opinions?

> 
> Also a short comment before the function would be nice to make the
> reader aware of the difference (e.g. when hot-plugging) between the
> vcpu-id and array-id.

Also not sure as the header directly includes the (for my eyes ;) ) easy code.
I would agree for a pure prototype. Other opinions?

> 
> Otherwise: +1 for finally having a proper common function for this!
> 

Thanks for having a look Thomas!

David

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Re: [PATCH 1/4] KVM: Provide function for VCPU lookup by id

[Paolo Bonzini]

On 19/11/2015 13:55, David Hildenbrand wrote:
>> > 
>> > I'm pretty sure this will cause confusion in the future!
>> > ==> Could you maybe name the new function something like
>> > "kvm_lookup_vcpu_by_id" or "kvm_get_vcpu_by_id" instead?
> Had that in a previous version but decided to name it that way ... hmm ...
> other opinions?

Having _by_id at the end of the name makes sense indeed.

Paolo
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Re: [PATCH 1/4] KVM: Provide function for VCPU lookup by id

[Christian Borntraeger]

On 11/19/2015 02:13 PM, Paolo Bonzini wrote:
> 
> 
> On 19/11/2015 13:55, David Hildenbrand wrote:

 I'm pretty sure this will cause confusion in the future!
 ==> Could you maybe name the new function something like
 "kvm_lookup_vcpu_by_id" or "kvm_get_vcpu_by_id" instead?
>> Had that in a previous version but decided to name it that way ... hmm ...
>> other opinions?
> 
> Having _by_id at the end of the name makes sense indeed.

David,
I will fix up the function name myself to kvm_get_vcpu_by_id. Ok?





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Re: [PATCH 1/4] KVM: Provide function for VCPU lookup by id

[David Hildenbrand]

> On 11/19/2015 02:13 PM, Paolo Bonzini wrote:
> > 
> > 
> > On 19/11/2015 13:55, David Hildenbrand wrote:
> 
>  I'm pretty sure this will cause confusion in the future!
>  ==> Could you maybe name the new function something like
>  "kvm_lookup_vcpu_by_id" or "kvm_get_vcpu_by_id" instead?
> >> Had that in a previous version but decided to name it that way ... hmm ...
> >> other opinions?
> > 
> > Having _by_id at the end of the name makes sense indeed.
> 
> David,
> I will fix up the function name myself to kvm_get_vcpu_by_id. Ok?

Sure, thanks a lot!

David

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