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SubjectRe: [PATCH 1/2] kvm: arm: Clean up the checking for huge mapping
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On 04/11/2019 02:48 AM, Zenghui Yu wrote:
>
> On 2019/4/10 23:23, Suzuki K Poulose wrote:
>> If we are checking whether the stage2 can map PAGE_SIZE,
>> we don't have to do the boundary checks as both the host
>> VMA and the guest memslots are page aligned. Bail the case
>> easily.
>>
>> Cc: Christoffer Dall <christoffer.dall@arm.com>
>> Cc: Marc Zyngier <marc.zyngier@arm.com>
>> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
>> ---
>>   virt/kvm/arm/mmu.c | 4 ++++
>>   1 file changed, 4 insertions(+)
>>
>> diff --git a/virt/kvm/arm/mmu.c b/virt/kvm/arm/mmu.c
>> index a39dcfd..6d73322 100644
>> --- a/virt/kvm/arm/mmu.c
>> +++ b/virt/kvm/arm/mmu.c
>> @@ -1624,6 +1624,10 @@ static bool
>> fault_supports_stage2_huge_mapping(struct kvm_memory_slot *memslot,
>>       hva_t uaddr_start, uaddr_end;
>>       size_t size;
>> +    /* The memslot and the VMA are guaranteed to be aligned to
>> PAGE_SIZE */
>> +    if (map_size == PAGE_SIZE)
>> +        return true;
>> +
>>       size = memslot->npages * PAGE_SIZE;
>>       gpa_start = memslot->base_gfn << PAGE_SHIFT;
>>
> We can do a comment clean up as well in this patch.
>
> s/<< PAGE_SIZE/<< PAGE_SHIFT/

Sure, I missed that. Will fix it in the next version.

Cheers
Suzuki

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