Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754786Ab3JXKK4 (ORCPT ); Thu, 24 Oct 2013 06:10:56 -0400 Received: from mail-ob0-f174.google.com ([209.85.214.174]:34336 "EHLO mail-ob0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754355Ab3JXKKz (ORCPT ); Thu, 24 Oct 2013 06:10:55 -0400 Message-ID: <5268F226.4030309@gmail.com> Date: Thu, 24 Oct 2013 18:10:46 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.0 MIME-Version: 1.0 To: Gleb Natapov , Xiao Guangrong CC: avi.kivity@gmail.com, mtosatti@redhat.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH v3 10/15] KVM: MMU: allocate shadow pages from slab References: <1382534973-13197-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com> <1382534973-13197-11-git-send-email-xiaoguangrong@linux.vnet.ibm.com> <20131024091905.GB5289@redhat.com> <5268E888.7060608@linux.vnet.ibm.com> <20131024095204.GD5289@redhat.com> In-Reply-To: <20131024095204.GD5289@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1094 Lines: 32 On 10/24/2013 05:52 PM, Gleb Natapov wrote: > On Thu, Oct 24, 2013 at 05:29:44PM +0800, Xiao Guangrong wrote: >> On 10/24/2013 05:19 PM, Gleb Natapov wrote: >> >>>> @@ -946,7 +947,7 @@ static inline struct kvm_mmu_page *page_header(hpa_t shadow_page) >>>> { >>>> struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT); >>>> >>>> - return (struct kvm_mmu_page *)page_private(page); >>>> + return (struct kvm_mmu_page *)(page->mapping); >>> Why? >> >> That's because page->private has been used by slab: >> > But does lockless path actually looks at it? Lockless path does not use it, however, it is used by kvm_mmu_page(): static inline struct kvm_mmu_page *page_header(hpa_t shadow_page) { struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT); return (struct kvm_mmu_page *)(page->mapping); } which is used in the common code. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/