From patchwork Wed Jun 22 14:32:55 2011 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Guangrong X-Patchwork-Id: 905372 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by demeter1.kernel.org (8.14.4/8.14.4) with ESMTP id p5MEVpcF027788 for ; Wed, 22 Jun 2011 14:31:51 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758151Ab1FVObG (ORCPT ); Wed, 22 Jun 2011 10:31:06 -0400 Received: from cn.fujitsu.com ([222.73.24.84]:51262 "EHLO song.cn.fujitsu.com" rhost-flags-OK-FAIL-OK-OK) by vger.kernel.org with ESMTP id S1757922Ab1FVObE (ORCPT ); Wed, 22 Jun 2011 10:31:04 -0400 Received: from tang.cn.fujitsu.com (tang.cn.fujitsu.com [10.167.250.3]) by song.cn.fujitsu.com (Postfix) with ESMTP id 30A6B17012D; Wed, 22 Jun 2011 22:30:55 +0800 (CST) Received: from mailserver.fnst.cn.fujitsu.com (tang.cn.fujitsu.com [127.0.0.1]) by tang.cn.fujitsu.com (8.14.3/8.13.1) with ESMTP id p5MEUsqV001887; Wed, 22 Jun 2011 22:30:54 +0800 Received: from localhost.localdomain ([10.167.225.99]) by mailserver.fnst.cn.fujitsu.com (Lotus Domino Release 8.5.1FP4) with ESMTP id 2011062222303110-642010 ; Wed, 22 Jun 2011 22:30:31 +0800 Message-ID: <4E01FD17.3020106@cn.fujitsu.com> Date: Wed, 22 Jun 2011 22:32:55 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.17) Gecko/20110428 Fedora/3.1.10-1.fc15 Thunderbird/3.1.10 MIME-Version: 1.0 To: Avi Kivity CC: Marcelo Tosatti , LKML , KVM Subject: [PATCH v2 12/22] KVM: MMU: split kvm_mmu_free_page References: <4E01FBC9.3020009@cn.fujitsu.com> In-Reply-To: <4E01FBC9.3020009@cn.fujitsu.com> X-MIMETrack: Itemize by SMTP Server on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-06-22 22:30:31, Serialize by Router on mailserver/fnst(Release 8.5.1FP4|July 25, 2010) at 2011-06-22 22:30:31, Serialize complete at 2011-06-22 22:30:31 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Greylist: IP, sender and recipient auto-whitelisted, not delayed by milter-greylist-4.2.6 (demeter1.kernel.org [140.211.167.41]); Wed, 22 Jun 2011 14:31:51 +0000 (UTC) Split kvm_mmu_free_page to kvm_mmu_isolate_page and kvm_mmu_free_page One is used to remove the page from cache under mmu lock and the other is used to free page table out of mmu lock Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 21 ++++++++++++++++++--- 1 files changed, 18 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 8233aba..c6fabf0 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -1039,14 +1039,28 @@ static inline void kvm_mod_used_mmu_pages(struct kvm *kvm, int nr) percpu_counter_add(&kvm_total_used_mmu_pages, nr); } -static void kvm_mmu_free_page(struct kvm_mmu_page *sp) +/* + * Remove the sp from shadow page cache, after call it, + * we can not find this sp from the cache, and the shadow + * page table is still valid. + * It should be under the protection of mmu lock. + */ +static void kvm_mmu_isolate_page(struct kvm_mmu_page *sp) { ASSERT(is_empty_shadow_page(sp->spt)); hlist_del(&sp->hash_link); - list_del(&sp->link); - free_page((unsigned long)sp->spt); if (!sp->role.direct) free_page((unsigned long)sp->gfns); +} + +/* + * Free the shadow page table and the sp, we can do it + * out of the protection of mmu lock. + */ +static void kvm_mmu_free_page(struct kvm_mmu_page *sp) +{ + list_del(&sp->link); + free_page((unsigned long)sp->spt); kmem_cache_free(mmu_page_header_cache, sp); } @@ -1678,6 +1692,7 @@ static void kvm_mmu_commit_zap_page(struct kvm *kvm, do { sp = list_first_entry(invalid_list, struct kvm_mmu_page, link); WARN_ON(!sp->role.invalid || sp->root_count); + kvm_mmu_isolate_page(sp); kvm_mmu_free_page(sp); } while (!list_empty(invalid_list));