linux-kernel - Re: [PATCH v3 1/8] KVM: x86/mmu: Deduplicate rmap freeing

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Date:   Fri, 7 May 2021 09:42:47 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Ben Gardon <bgardon@...gle.com>, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org
Cc:     Paolo Bonzini <pbonzini@...hat.com>, Peter Xu <peterx@...hat.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Peter Shier <pshier@...gle.com>,
        Yulei Zhang <yulei.kernel@...il.com>,
        Wanpeng Li <kernellwp@...il.com>,
        Xiao Guangrong <xiaoguangrong.eric@...il.com>,
        Kai Huang <kai.huang@...el.com>,
        Keqian Zhu <zhukeqian1@...wei.com>
Subject: Re: [PATCH v3 1/8] KVM: x86/mmu: Deduplicate rmap freeing

On 06.05.21 20:42, Ben Gardon wrote:
> Small code deduplication. No functional change expected.
> 
> Signed-off-by: Ben Gardon <bgardon@...gle.com>
> ---
>   arch/x86/kvm/x86.c | 19 +++++++++++--------
>   1 file changed, 11 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index cf3b67679cf0..5bcf07465c47 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -10818,17 +10818,23 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
>   	kvm_hv_destroy_vm(kvm);
>   }
>   
> -void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
> +static void free_memslot_rmap(struct kvm_memory_slot *slot)
>   {
>   	int i;
>   
>   	for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
>   		kvfree(slot->arch.rmap[i]);
>   		slot->arch.rmap[i] = NULL;
> +	}
> +}
>   
> -		if (i == 0)
> -			continue;
> +void kvm_arch_free_memslot(struct kvm *kvm, struct kvm_memory_slot *slot)
> +{
> +	int i;
> +
> +	free_memslot_rmap(slot);
>   
> +	for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
>   		kvfree(slot->arch.lpage_info[i - 1]);
>   		slot->arch.lpage_info[i - 1] = NULL;
>   	}
> @@ -10894,12 +10900,9 @@ static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
>   	return 0;
>   
>   out_free:
> -	for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) {
> -		kvfree(slot->arch.rmap[i]);
> -		slot->arch.rmap[i] = NULL;
> -		if (i == 0)
> -			continue;
> +	free_memslot_rmap(slot);
>   
> +	for (i = 1; i < KVM_NR_PAGE_SIZES; ++i) {
>   		kvfree(slot->arch.lpage_info[i - 1]);
>   		slot->arch.lpage_info[i - 1] = NULL;
>   	}
> 

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb