linux-kernel - Re: [PATCH 2/6] KVM MMU: fix kvm_mmu_zap

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4BC3CA16.6020106@cn.fujitsu.com>
Date:	Tue, 13 Apr 2010 09:34:14 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, KVM list <kvm@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/6] KVM MMU: fix kvm_mmu_zap_page() and its calling path



Marcelo Tosatti wrote:

>> @@ -1483,8 +1483,8 @@ static int mmu_zap_unsync_children(struct kvm *kvm,
>>  		for_each_sp(pages, sp, parents, i) {
>>  			kvm_mmu_zap_page(kvm, sp);
>>  			mmu_pages_clear_parents(&parents);
>> +			zapped++;
>>  		}
>> -		zapped += pages.nr;
>>  		kvm_mmu_pages_init(parent, &parents, &pages);
>>  	}
> 
> Don't see why this is needed? The for_each_sp loop uses pvec.nr.

I think mmu_zap_unsync_children() should return the number of zapped pages then we
can adjust the number of free pages in kvm_mmu_change_mmu_pages(), but pages.nr no
only includes the unsync/zapped pages but also includes their parents.

Thanks,
Xiao
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/