Re: [PATCH v5 14/19] KVM: Clean up local variable usage in __kvm_set_memory_region()

[Peter Xu]

On Tue, Jan 21, 2020 at 02:31:52PM -0800, Sean Christopherson wrote:

[...]

> @@ -1101,52 +1099,55 @@ int __kvm_set_memory_region(struct kvm *kvm,
>  	if (mem->guest_phys_addr + mem->memory_size < mem->guest_phys_addr)
>  		return -EINVAL;
>  
> -	slot = id_to_memslot(__kvm_memslots(kvm, as_id), id);
> -	base_gfn = mem->guest_phys_addr >> PAGE_SHIFT;
> -	npages = mem->memory_size >> PAGE_SHIFT;
> -
> -	if (npages > KVM_MEM_MAX_NR_PAGES)
> -		return -EINVAL;
> -
>  	/*
>  	 * Make a full copy of the old memslot, the pointer will become stale
>  	 * when the memslots are re-sorted by update_memslots().
>  	 */
> -	old = *slot;
> +	tmp = id_to_memslot(__kvm_memslots(kvm, as_id), id);
> +	old = *tmp;
> +	tmp = NULL;

Shall we keep this chunk to the patch where it will be used?  Other
than that, it looks good to me.

Thanks,

-- 
Peter Xu