Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965260AbbLWLeJ (ORCPT ); Wed, 23 Dec 2015 06:34:09 -0500 Received: from mga01.intel.com ([192.55.52.88]:40566 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932531AbbLWLdK (ORCPT ); Wed, 23 Dec 2015 06:33:10 -0500 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.20,468,1444719600"; d="scan'208";a="877401204" 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 09/11] KVM: MMU: simplify mmu_need_write_protect Date: Wed, 23 Dec 2015 19:25:52 +0800 Message-Id: <1450869954-30273-10-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: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1905 Lines: 71 Now, all non-leaf shadow page are page tracked, if gfn is not tracked there is no non-leaf shadow page of gfn is existed, we can directly make the shadow page of gfn to unsync Signed-off-by: Xiao Guangrong --- arch/x86/kvm/mmu.c | 26 ++++++++------------------ 1 file changed, 8 insertions(+), 18 deletions(-) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index 5a2ca73..f89e77f 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -2461,41 +2461,31 @@ static void __kvm_unsync_page(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) kvm_mmu_mark_parents_unsync(sp); } -static void kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn) +static bool kvm_unsync_pages(struct kvm_vcpu *vcpu, gfn_t gfn, + bool can_unsync) { struct kvm_mmu_page *s; for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { + if (!can_unsync) + return true; + if (s->unsync) continue; WARN_ON(s->role.level != PT_PAGE_TABLE_LEVEL); __kvm_unsync_page(vcpu, s); } + + return false; } static bool mmu_need_write_protect(struct kvm_vcpu *vcpu, gfn_t gfn, bool can_unsync) { - struct kvm_mmu_page *s; - bool need_unsync = false; - if (kvm_page_track_check_mode(vcpu, gfn, KVM_PAGE_TRACK_WRITE)) return true; - for_each_gfn_indirect_valid_sp(vcpu->kvm, s, gfn) { - if (!can_unsync) - return true; - - if (s->role.level != PT_PAGE_TABLE_LEVEL) - return true; - - if (!s->unsync) - need_unsync = true; - } - if (need_unsync) - kvm_unsync_pages(vcpu, gfn); - - return false; + return kvm_unsync_pages(vcpu, gfn, can_unsync); } static bool kvm_is_mmio_pfn(pfn_t pfn) -- 1.8.3.1 -- 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/