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

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Date:	Mon, 12 Jul 2010 15:28:08 +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 07/12/2010 05:55 AM, Xiao Guangrong wrote:
>
>>> @@ -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;
>>>
>>>        
>
>> Why not return 0 if !enough?
>>
>>      
> I think it's better that handle the reset pages in the slot, for example,
> we expect 16 pages are consecutive, but only 12 pages in the slot, the better
> way is handle the reset 12 pages not throw those away.

It will almost never happen, let's remove edge cases.




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

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