Re: [PATCH 1/2] kvm: arm: Clean up the checking for huge mapping

[Zenghui Yu]

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@xxxxxxx>
> Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx>
> ---
>   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/


thanks,
zenghui