linux-kernel - Re: [PATCH 1/9] KVM: introduce kvm_alloc/free

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Date:	Wed, 20 May 2015 16:38:55 +0900
From:	Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>
To:	Paolo Bonzini <pbonzini@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org
CC:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>, rkrcmar@...hat.com
Subject: Re: [PATCH 1/9] KVM: introduce kvm_alloc/free_memslots

On 2015/05/20 2:25, Paolo Bonzini wrote:

> +static void kvm_free_memslots(struct kvm *kvm, struct kvm_memslots *slots)
> +{
> +	struct kvm_memory_slot *memslot;
> +
> +	if (!slots)
> +		return;
> +
> +	kvm_for_each_memslot(memslot, slots)
> +		kvm_free_memslot(kvm, memslot, NULL);
> +
> +	kvfree(slots);
>   }
>   
>   static struct kvm *kvm_create_vm(unsigned long type)
> @@ -472,17 +519,10 @@ static struct kvm *kvm_create_vm(unsigned long type)
>   	BUILD_BUG_ON(KVM_MEM_SLOTS_NUM > SHRT_MAX);
>   
>   	r = -ENOMEM;
> -	kvm->memslots = kvm_kvzalloc(sizeof(struct kvm_memslots));
> +	kvm->memslots = kvm_alloc_memslots();
>   	if (!kvm->memslots)
>   		goto out_err_no_srcu;
>   
> -	/*
> -	 * Init kvm generation close to the maximum to easily test the
> -	 * code of handling generation number wrap-around.
> -	 */
> -	kvm->memslots->generation = -150;
> -
> -	kvm_init_memslots_id(kvm);
>   	if (init_srcu_struct(&kvm->srcu))
>   		goto out_err_no_srcu;
>   	if (init_srcu_struct(&kvm->irq_srcu))
> @@ -523,7 +563,7 @@ out_err_no_srcu:
>   out_err_no_disable:
>   	for (i = 0; i < KVM_NR_BUSES; i++)
>   		kfree(kvm->buses[i]);
> -	kvfree(kvm->memslots);
> +	kvm_free_memslots(kvm, kvm->memslots);

Newly added code
+	kvm_for_each_memslot(memslot, slots)
+		kvm_free_memslot(kvm, memslot, NULL);
does nothing in effect, but looks better to be here since this
corresponds to kvm_alloc_memslots() part and may be safer for
future changes.

Other changes look like trivial transitions to the new
kvm_alloc/free_memslots.

Reviewed-by: Takuya Yoshikawa <yoshikawa_takuya_b1@....ntt.co.jp>

>   	kvm_arch_free_vm(kvm);
>   	return ERR_PTR(r);
>   }

	Takuya

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