linux-kernel - Re: [PATCH v5 5/9] KVM: MMU: introduce gfn_to_page_many

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Date:	Sun, 11 Jul 2010 15:59:28 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH v5 5/9] KVM: MMU: introduce gfn_to_page_many_atomic()
 function

On 07/06/2010 01:48 PM, Xiao Guangrong wrote:
> This function not only return the gfn's page but also the page number
> after @gfn in the slot
>
>
> @@ -923,15 +923,25 @@ static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn)
>   	return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE;
>   }
>
> -unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
> +static unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn, int *entry)
>   {
>    

'entry' better be gfn_t.  We limit gfns in a slot, but that's 
artificial, let's use the correct type.

Also suggest nr_pages as the name.

> @@ -1011,6 +1021,23 @@ pfn_t gfn_to_pfn_memslot(struct kvm *kvm,
>   	return hva_to_pfn(kvm, addr, false);
>   }
>
> +int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn,
> +			    struct page **pages, int nr_pages, bool *enough)
> +{
> +	unsigned long addr;
> +	int entry, ret;
> +
> +	addr = gfn_to_hva_many(kvm, gfn,&entry);
> +	if (kvm_is_error_hva(addr))
> +		return -1;
> +
> +	entry = min(entry, nr_pages);
> +	*enough = (entry == nr_pages) ? true : false;
>    

s/ ? true : false//; :)

Why not return 0 if !enough?

> +	ret = __get_user_pages_fast(addr, entry, 1, pages);
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic);
> +
>   struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn)
>   {
>   	pfn_t pfn;
>    


-- 
error compiling committee.c: too many arguments to function

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