From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754428Ab3JWNcR (ORCPT ); Wed, 23 Oct 2013 09:32:17 -0400 Received: from e28smtp04.in.ibm.com ([122.248.162.4]:45071 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751375Ab3JWNaH (ORCPT ); Wed, 23 Oct 2013 09:30:07 -0400 From: Xiao Guangrong To: gleb@redhat.com Cc: avi.kivity@gmail.com, mtosatti@redhat.com, pbonzini@redhat.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Xiao Guangrong Subject: [PATCH v3 11/15] KVM: MMU: locklessly access shadow page under rcu protection Date: Wed, 23 Oct 2013 21:29:29 +0800 Message-Id: <1382534973-13197-12-git-send-email-xiaoguangrong@linux.vnet.ibm.com> X-Mailer: git-send-email 1.8.1.4 In-Reply-To: <1382534973-13197-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com> References: <1382534973-13197-1-git-send-email-xiaoguangrong@linux.vnet.ibm.com> X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13102313-5564-0000-0000-00000A53F900 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use SLAB_DESTROY_BY_RCU to prevent the shadow page to be freed from the slab, so that it can be locklessly accessed by holding rcu lock Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 1bcc8c8..5b42858 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4710,8 +4710,8 @@ int kvm_mmu_module_init(void) goto nomem; mmu_shadow_page_cache = kmem_cache_create("mmu_shadow_page_cache", - PAGE_SIZE, PAGE_SIZE, 0, - init_shadow_page_table); + PAGE_SIZE, PAGE_SIZE, SLAB_DESTROY_BY_RCU, + init_shadow_page_table); if (!mmu_shadow_page_cache) goto nomem; -- 1.8.1.4