linux-kernel - Re: [PATCH v2 3/9] KVM: MMU: introduce for_each_slot_rmap

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Date:	Tue, 12 May 2015 10:22:32 +0200
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Xiao Guangrong <guangrong.xiao@...ux.intel.com>
CC:	gleb@...nel.org, mtosatti@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 3/9] KVM: MMU: introduce for_each_slot_rmap_range



On 12/05/2015 04:32, Xiao Guangrong wrote:
> +#define for_each_slot_rmap_range(_slot_, _start_level_, _end_level_,	\
> +	   _start_gfn, _end_gfn, _iter_)				\
> +	for (slot_rmap_walk_init(_iter_, _slot_, _start_level_,		\
> +				 _end_level_, _start_gfn, _end_gfn);	\
> +	     slot_rmap_walk_okay(_iter_);				\
> +	     slot_rmap_walk_next(_iter_))
> +


> +		for_each_slot_rmap_range(memslot, PT_PAGE_TABLE_LEVEL,
> +		   PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES - 1,


What about adding a

#define for PT_MAX_HUGEPAGE_LEVEL  (PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES - 1)

?

> +		   gfn_start, gfn_end - 1, &iterator)
> +			ret |= handler(kvm, iterator.rmap, memslot,
> +				       iterator.gfn, iterator.level, data);

I prefer to indent by two tabs:

		for_each_slot_rmap_range(memslot,
				PT_PAGE_TABLE_LEVEL, PT_MAX_HUGEPAGE_LEVEL,
				gfn_start, gfn_end - 1, &iterator)
			ret |= handler(kvm, iterator.rmap, memslot,
				       iterator.gfn, iterator.level, data);


Same in the next patch:

	for_each_slot_rmap_range(memslot,
			start_level, end_level,
			start_gfn, end_gfn, &iterator) {
		if (iterator.rmap)
			flush |= fn(kvm, iterator.rmap);
		...
	}
Thanks,

Paolo
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