From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754925Ab3AWKKw (ORCPT ); Wed, 23 Jan 2013 05:10:52 -0500 Received: from e23smtp06.au.ibm.com ([202.81.31.148]:42528 "EHLO e23smtp06.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754210Ab3AWKKu (ORCPT ); Wed, 23 Jan 2013 05:10:50 -0500 Message-ID: <50FFB721.2020509@linux.vnet.ibm.com> Date: Wed, 23 Jan 2013 18:10:41 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 MIME-Version: 1.0 To: Xiao Guangrong CC: Marcelo Tosatti , Avi Kivity , Gleb Natapov , LKML , KVM Subject: [PATCH v2 12/12] KVM: MMU: fast drop all spte on the pte_list References: <50FFB5A1.5090708@linux.vnet.ibm.com> In-Reply-To: <50FFB5A1.5090708@linux.vnet.ibm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13012310-7014-0000-0000-000002815D55 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If the pte_list need to be destroyed, no need to delete its spte one by one, we can directly reset it and free the memory its used Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 36 +++++++++++++++++++++++++++--------- 1 files changed, 27 insertions(+), 9 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 2c0a786..0afe8da 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -968,6 +968,25 @@ static void pte_list_remove(u64 *spte, unsigned long *pte_list) } } +static void pte_list_destroy(unsigned long *pte_list) +{ + struct pte_list_desc *desc; + unsigned long list_value = *pte_list; + + *pte_list = 0; + + if (!(list_value & 1)) + return; + + desc = (struct pte_list_desc *)(list_value & ~1ul); + while (desc) { + struct pte_list_desc *next_desc = desc->more; + + mmu_free_pte_list_desc(desc); + desc = next_desc; + } +} + /* * Used by the following functions to iterate through the sptes linked by a * pte_list. All fields are private and not assumed to be used outside. @@ -1206,17 +1225,17 @@ static bool rmap_write_protect(struct kvm *kvm, u64 gfn) static int kvm_unmap_rmapp(struct kvm *kvm, unsigned long *rmapp, struct kvm_memory_slot *slot, unsigned long data) { - u64 *sptep; struct pte_list_iterator iter; + u64 *sptep; int need_tlb_flush = 0; -restart: for_each_spte_in_rmap(*rmapp, iter, sptep) { - drop_spte(kvm, sptep); + mmu_spte_clear_track_bits(sptep); need_tlb_flush = 1; - goto restart; } + pte_list_destroy(rmapp); + return need_tlb_flush; } @@ -2041,11 +2060,10 @@ static void kvm_mmu_unlink_parents(struct kvm *kvm, struct kvm_mmu_page *sp) u64 *sptep; struct pte_list_iterator iter; -restart: - for_each_spte_in_rmap(sp->parent_ptes, iter, sptep) { - drop_parent_pte(sp, sptep); - goto restart; - } + for_each_spte_in_rmap(sp->parent_ptes, iter, sptep) + mmu_spte_clear_no_track(sptep); + + pte_list_destroy(&sp->parent_ptes); } static int mmu_zap_unsync_children(struct kvm *kvm, -- 1.7.7.6