linux-kernel - Re: [PATCH 09/15] KVM: MMU: split kvm_mmu_free

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Message-ID: <4DF19484.8000707@cn.fujitsu.com>
Date:	Fri, 10 Jun 2011 11:50:28 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH 09/15] KVM: MMU: split kvm_mmu_free_page

On 06/09/2011 03:07 PM, Avi Kivity wrote:
> On 06/07/2011 04:03 PM, Xiao Guangrong wrote:
>> Split kvm_mmu_free_page to kvm_mmu_free_lock_parts and
>> kvm_mmu_free_unlock_parts
>>
>> One is used to free the parts which is under mmu lock and the other is
>> used to free the parts which can allow be freed out of mmu lock
>>
>> It is used by later patch
> 
> Suggest kvm_mmu_isolate_page() and kvm_mmu_free_page().  Plus a comment explaining things, unless someone can come up with a better name.
> 

Good names, will fix.

>> -static void kvm_mmu_free_page(struct kvm_mmu_page *sp)
>> +static void kvm_mmu_free_lock_parts(struct kvm_mmu_page *sp)
>>   {
>>       ASSERT(is_empty_shadow_page(sp->spt));
>>       hlist_del(&sp->hash_link);
>> -    list_del(&sp->link);
>> -    free_page((unsigned long)sp->spt);
>>       if (!sp->role.direct)
>>           free_page((unsigned long)sp->gfns);
>> +}
>> +
>> +static void kvm_mmu_free_unlock_parts(struct kvm_mmu_page *sp)
>> +{
>> +    list_del(&sp->link);
>> +    free_page((unsigned long)sp->spt);
>>       kmem_cache_free(mmu_page_header_cache, sp);
>>   }
> 
> The list_del() must be run under a lock, no? it can access kvm->arch.active_mmu_pages.
> 

In prepare path, we have moved the sp from active_mmu_pages to invlaid_list.
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