linux-kernel - Re: [PATCH v7 03/11] KVM: MMU: fast invalidate all pages

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Date:	Mon, 27 May 2013 10:02:29 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	gleb@...hat.com, avi.kivity@...il.com, pbonzini@...hat.com,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Subject: Re: [PATCH v7 03/11] KVM: MMU: fast invalidate all pages

Hi Marcelo,

On 05/25/2013 04:23 AM, Marcelo Tosatti wrote:

>> +static void kvm_zap_obsolete_pages(struct kvm *kvm)
>> +{
>> +	struct kvm_mmu_page *sp, *node;
>> +	LIST_HEAD(invalid_list);
>> +
>> +restart:
>> +	list_for_each_entry_safe_reverse(sp, node,
>> +	      &kvm->arch.active_mmu_pages, link) {
>> +		/*
>> +		 * No obsolete page exists before new created page since
>> +		 * active_mmu_pages is the FIFO list.
>> +		 */
>> +		if (!is_obsolete_sp(kvm, sp))
>> +			break;
> 
> Can you add a comment to list_add(x, active_mmu_pages) callsites
> mentioning this case?
> 
> Because it'll break silently if people do list_add_tail().

Sure, I will do it in the next version.

And i totally agree with Gleb's points that reply your other questions
in this patch.

Thank you all!

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