From patchwork Wed Dec 23 11:25:45 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xiao Guangrong X-Patchwork-Id: 7910881 Return-Path: X-Original-To: patchwork-kvm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork2.web.kernel.org (Postfix) with ESMTP id 0BD58BEEE5 for ; Wed, 23 Dec 2015 11:36:40 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 3B84A20431 for ; Wed, 23 Dec 2015 11:36:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 583DD203E6 for ; Wed, 23 Dec 2015 11:36:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756666AbbLWLdA (ORCPT ); Wed, 23 Dec 2015 06:33:00 -0500 Received: from mga01.intel.com ([192.55.52.88]:33760 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756637AbbLWLc6 (ORCPT ); Wed, 23 Dec 2015 06:32:58 -0500 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga101.fm.intel.com with ESMTP; 23 Dec 2015 03:32:58 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,468,1444719600"; d="scan'208";a="877401092" Received: from xiaoreal1.sh.intel.com (HELO xiaoreal1.sh.intel.com.sh.intel.com) ([10.239.48.79]) by orsmga002.jf.intel.com with ESMTP; 23 Dec 2015 03:32:56 -0800 From: Xiao Guangrong To: pbonzini@redhat.com Cc: gleb@kernel.org, mtosatti@redhat.com, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, kai.huang@linux.intel.com, jike.song@intel.com, Xiao Guangrong Subject: [PATCH v2 02/11] KVM: MMU: introduce kvm_mmu_gfn_{allow, disallow}_lpage Date: Wed, 23 Dec 2015 19:25:45 +0800 Message-Id: <1450869954-30273-3-git-send-email-guangrong.xiao@linux.intel.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1450869954-30273-1-git-send-email-guangrong.xiao@linux.intel.com> References: <1450869954-30273-1-git-send-email-guangrong.xiao@linux.intel.com> Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Abstract the common operations from account_shadowed() and unaccount_shadowed(), then introduce kvm_mmu_gfn_disallow_lpage() and kvm_mmu_gfn_allow_lpage() These two functions will be used by page tracking in the later patch Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 38 +++++++++++++++++++++++++------------- arch/x86/kvm/mmu.h | 3 +++ 2 files changed, 28 insertions(+), 13 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 61259ff..4b04d13 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -776,21 +776,39 @@ static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, return &slot->arch.lpage_info[level - 2][idx]; } +static void update_gfn_disallow_lpage_count(struct kvm_memory_slot *slot, + gfn_t gfn, int count) +{ + struct kvm_lpage_info *linfo; + int i; + + for (i = PT_DIRECTORY_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) { + linfo = lpage_info_slot(gfn, slot, i); + linfo->disallow_lpage += count; + WARN_ON(linfo->disallow_lpage < 0); + } +} + +void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn) +{ + update_gfn_disallow_lpage_count(slot, gfn, 1); +} + +void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn) +{ + update_gfn_disallow_lpage_count(slot, gfn, -1); +} + static void account_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp) { struct kvm_memslots *slots; struct kvm_memory_slot *slot; - struct kvm_lpage_info *linfo; gfn_t gfn; - int i; gfn = sp->gfn; slots = kvm_memslots_for_spte_role(kvm, sp->role); slot = __gfn_to_memslot(slots, gfn); - for (i = PT_DIRECTORY_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) { - linfo = lpage_info_slot(gfn, slot, i); - linfo->disallow_lpage += 1; - } + kvm_mmu_gfn_disallow_lpage(slot, gfn); kvm->arch.indirect_shadow_pages++; } @@ -798,18 +816,12 @@ static void unaccount_shadowed(struct kvm *kvm, struct kvm_mmu_page *sp) { struct kvm_memslots *slots; struct kvm_memory_slot *slot; - struct kvm_lpage_info *linfo; gfn_t gfn; - int i; gfn = sp->gfn; slots = kvm_memslots_for_spte_role(kvm, sp->role); slot = __gfn_to_memslot(slots, gfn); - for (i = PT_DIRECTORY_LEVEL; i <= PT_MAX_HUGEPAGE_LEVEL; ++i) { - linfo = lpage_info_slot(gfn, slot, i); - linfo->disallow_lpage -= 1; - WARN_ON(linfo->disallow_lpage < 0); - } + kvm_mmu_gfn_allow_lpage(slot, gfn); kvm->arch.indirect_shadow_pages--; } diff --git a/arch/x86/kvm/mmu.h b/arch/x86/kvm/mmu.h index 55ffb7b..de92bed 100644 --- a/arch/x86/kvm/mmu.h +++ b/arch/x86/kvm/mmu.h @@ -174,4 +174,7 @@ static inline bool permission_fault(struct kvm_vcpu *vcpu, struct kvm_mmu *mmu, void kvm_mmu_invalidate_zap_all_pages(struct kvm *kvm); void kvm_zap_gfn_range(struct kvm *kvm, gfn_t gfn_start, gfn_t gfn_end); + +void kvm_mmu_gfn_disallow_lpage(struct kvm_memory_slot *slot, gfn_t gfn); +void kvm_mmu_gfn_allow_lpage(struct kvm_memory_slot *slot, gfn_t gfn); #endif