linux-kernel - Re: [PATCH 6/6] KVM MMU: optimize synchronization shadow pages

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Date:	Mon, 12 Apr 2010 19:14:42 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Avi Kivity <avi@...hat.com>
CC:	Marcelo Tosatti <mtosatti@...hat.com>,
	KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 6/6] KVM MMU: optimize synchronization shadow pages



Avi Kivity wrote:
> On 04/12/2010 11:06 AM, Xiao Guangrong wrote:
>> - chain all unsync shadow pages then we can fetch them quickly
>> - flush local/remote tlb after all shadow page synced
>>
>> Signed-off-by: Xiao Guangrong<xiaoguangrong@...fujitsu.com>
>> ---
>>   arch/x86/include/asm/kvm_host.h |    1 +
>>   arch/x86/kvm/mmu.c              |   82
>> ++++++++++++++++++---------------------
>>   2 files changed, 39 insertions(+), 44 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/kvm_host.h
>> b/arch/x86/include/asm/kvm_host.h
>> index d463bc6..ae543fb 100644
>> --- a/arch/x86/include/asm/kvm_host.h
>> +++ b/arch/x86/include/asm/kvm_host.h
>> @@ -207,6 +207,7 @@ struct kvm_mmu_page {
>>       #define MMU_PAGE_UNSYNC 0x2
>>       unsigned int flags;
>>       unsigned int unsync_children;
>> +    struct list_head unsync_link;
>>       union {
>>           u64 *parent_pte;               /* !multimapped */
>>           struct hlist_head parent_ptes; /* multimapped, kvm_pte_chain */
>> diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
>> index 18eceb2..fcb6299 100644
>> --- a/arch/x86/kvm/mmu.c
>> +++ b/arch/x86/kvm/mmu.c
>> @@ -177,6 +177,8 @@ typedef int (*mmu_parent_walk_fn) (struct
>> kvm_mmu_page *sp, u64 *spte);
>>   static struct kmem_cache *pte_chain_cache;
>>   static struct kmem_cache *rmap_desc_cache;
>>   static struct kmem_cache *mmu_page_header_cache;
>> +static struct list_head unsync_mmu_page_list =
>> +            LIST_HEAD_INIT(unsync_mmu_page_list);
>>
>>    
> 
> Does this really need to be global?  Should be per guest.
> 

Ah... this patch need more cooking, i'll improve it... thanks for you point it out.

Xiao
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