linux-kernel - Re: [PATCH 2/4] KVM: arm64: Use find_vma

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Date:   Mon, 15 Mar 2021 20:42:06 +1100
From:   Gavin Shan <gshan@...hat.com>
To:     Keqian Zhu <zhukeqian1@...wei.com>, kvmarm@...ts.cs.columbia.edu
Cc:     maz@...nel.org, will@...nel.org, linux-kernel@...r.kernel.org,
        shan.gavin@...il.com
Subject: Re: [PATCH 2/4] KVM: arm64: Use find_vma_intersection()

Hi Keqian,

On 3/15/21 7:04 PM, Keqian Zhu wrote:
> On 2021/3/15 12:18, Gavin Shan wrote:
>> find_vma_intersection() has been existing to search the intersected
>> vma. This uses the function where it's applicable, to simplify the
>> code.
>>
>> Signed-off-by: Gavin Shan <gshan@...hat.com>
>> ---
>>   arch/arm64/kvm/mmu.c | 10 ++++++----
>>   1 file changed, 6 insertions(+), 4 deletions(-)
>>
>> diff --git a/arch/arm64/kvm/mmu.c b/arch/arm64/kvm/mmu.c
>> index 84e70f953de6..286b603ed0d3 100644
>> --- a/arch/arm64/kvm/mmu.c
>> +++ b/arch/arm64/kvm/mmu.c
>> @@ -421,10 +421,11 @@ static void stage2_unmap_memslot(struct kvm *kvm,
>>   	 *     +--------------------------------------------+
>>   	 */
>>   	do {
>> -		struct vm_area_struct *vma = find_vma(current->mm, hva);
>> +		struct vm_area_struct *vma;
>>   		hva_t vm_start, vm_end;
>>   
>> -		if (!vma || vma->vm_start >= reg_end)
>> +		vma = find_vma_intersection(current->mm, hva, reg_end);
> Nit: Keep a same style may be better(Assign vma when declare it).
> Other looks good to me.
> 

Yeah, I agree. I will adjust the code in v2 and included your r-b.
Thanks for your time to review.

Thanks,
Gavin

  
>> +		if (!vma)
>>   			break;
>>   
>>   		/*
>> @@ -1330,10 +1331,11 @@ int kvm_arch_prepare_memory_region(struct kvm *kvm,
>>   	 *     +--------------------------------------------+
>>   	 */
>>   	do {
>> -		struct vm_area_struct *vma = find_vma(current->mm, hva);
>> +		struct vm_area_struct *vma;
>>   		hva_t vm_start, vm_end;
>>   
>> -		if (!vma || vma->vm_start >= reg_end)
>> +		vma = find_vma_intersection(current->mm, hva, reg_end);
>> +		if (!vma)
>>   			break;
>>   
>>   		/*
>>
>