From patchwork Tue Oct 20 21:56:09 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sean Christopherson X-Patchwork-Id: 11847967 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.7 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id BF973C388F2 for ; Tue, 20 Oct 2020 21:57:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 73EAE2237B for ; Tue, 20 Oct 2020 21:57:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2438927AbgJTV4w (ORCPT ); Tue, 20 Oct 2020 17:56:52 -0400 Received: from mga12.intel.com ([192.55.52.136]:61055 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2438830AbgJTV4R (ORCPT ); Tue, 20 Oct 2020 17:56:17 -0400 IronPort-SDR: 8/ZCuackIyQ9Xj4ar4YNUxfnxcVI9ED4WI+9x/4l/GEyzeqVC+Kz/7WSpuz3Z0GgQ43jPubfgW 6N/xitoNWssA== X-IronPort-AV: E=McAfee;i="6000,8403,9780"; a="146576329" X-IronPort-AV: E=Sophos;i="5.77,399,1596524400"; d="scan'208";a="146576329" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Oct 2020 14:56:16 -0700 IronPort-SDR: 7mCi+CStn72T7erjpK83s/MWZS2sKT6C+dYb6+w84pIzYANid/1CY8LfJIqK+JIqg2hZDihP65 80FQcZZuEYbA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.77,399,1596524400"; d="scan'208";a="301827746" Received: from sjchrist-coffee.jf.intel.com ([10.54.74.160]) by fmsmga008.fm.intel.com with ESMTP; 20 Oct 2020 14:56:16 -0700 From: Sean Christopherson To: Paolo Bonzini Cc: Sean Christopherson , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , kvm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 06/10] KVM: VMX: Don't invalidate hv_tlb_eptp if the new EPTP matches Date: Tue, 20 Oct 2020 14:56:09 -0700 Message-Id: <20201020215613.8972-7-sean.j.christopherson@intel.com> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201020215613.8972-1-sean.j.christopherson@intel.com> References: <20201020215613.8972-1-sean.j.christopherson@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Don't invalidate the common EPTP, and thus trigger rechecking of EPTPs across all vCPUs, if the new EPTP matches the old/common EPTP. In all likelihood this is a meaningless optimization, but there are (uncommon) scenarios where KVM can reload the same EPTP. Signed-off-by: Sean Christopherson Reviewed-by: Vitaly Kuznetsov --- arch/x86/kvm/vmx/vmx.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 4dfde8b64750..e6569bafacdc 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -3043,7 +3043,8 @@ static void vmx_load_mmu_pgd(struct kvm_vcpu *vcpu, unsigned long pgd, if (kvm_x86_ops.tlb_remote_flush) { spin_lock(&to_kvm_vmx(kvm)->ept_pointer_lock); to_vmx(vcpu)->ept_pointer = eptp; - to_kvm_vmx(kvm)->hv_tlb_eptp = INVALID_PAGE; + if (eptp != to_kvm_vmx(kvm)->hv_tlb_eptp) + to_kvm_vmx(kvm)->hv_tlb_eptp = INVALID_PAGE; spin_unlock(&to_kvm_vmx(kvm)->ept_pointer_lock); }