From mboxrd@z Thu Jan 1 00:00:00 1970 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=-1.0 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS autolearn=ham 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 3950AC46467 for ; Thu, 2 Aug 2018 10:01:52 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id ECA282150A for ; Thu, 2 Aug 2018 10:01:51 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org ECA282150A Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387405AbeHBLwO (ORCPT ); Thu, 2 Aug 2018 07:52:14 -0400 Received: from mx3-rdu2.redhat.com ([66.187.233.73]:50388 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726769AbeHBLwN (ORCPT ); Thu, 2 Aug 2018 07:52:13 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 47B9F40216F4; Thu, 2 Aug 2018 10:01:48 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.43.2.155]) by smtp.corp.redhat.com (Postfix) with ESMTP id 161DF213ED6A; Thu, 2 Aug 2018 10:01:46 +0000 (UTC) From: Vitaly Kuznetsov To: kvm@vger.kernel.org Cc: Paolo Bonzini , =?UTF-8?q?Radim=20Kr=C4=8Dm=C3=A1=C5=99?= , linux-kernel@vger.kernel.org, Jim Mattson , Liran Alon Subject: [PATCH 9/9] x86/kvm/mmu: check if MMU reconfiguration is needed in init_kvm_nested_mmu() Date: Thu, 2 Aug 2018 12:01:32 +0200 Message-Id: <20180802100132.5249-10-vkuznets@redhat.com> In-Reply-To: <20180802100132.5249-1-vkuznets@redhat.com> References: <20180802100132.5249-1-vkuznets@redhat.com> X-Scanned-By: MIMEDefang 2.78 on 10.11.54.6 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Thu, 02 Aug 2018 10:01:48 +0000 (UTC) X-Greylist: inspected by milter-greylist-4.5.16 (mx1.redhat.com [10.11.55.5]); Thu, 02 Aug 2018 10:01:48 +0000 (UTC) for IP:'10.11.54.6' DOMAIN:'int-mx06.intmail.prod.int.rdu2.redhat.com' HELO:'smtp.corp.redhat.com' FROM:'vkuznets@redhat.com' RCPT:'' Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We don't use root page role for nested_mmu, however, optimizing out re-initialization in case nothing changed is still valuable as this is done for every nested vmentry. Signed-off-by: Vitaly Kuznetsov --- arch/x86/kvm/mmu.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index c621d9892a37..3d57c3961765 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -4877,8 +4877,14 @@ static void init_kvm_softmmu(struct kvm_vcpu *vcpu) static void init_kvm_nested_mmu(struct kvm_vcpu *vcpu) { + union kvm_mmu_role new_role = kvm_calc_mmu_role_common(vcpu, true); struct kvm_mmu *g_context = &vcpu->arch.nested_mmu; + new_role.base_role.word &= mmu_base_role_mask.word; + if (new_role.as_u64 == g_context->mmu_role.as_u64) + return; + + g_context->mmu_role.as_u64 = new_role.as_u64; g_context->get_cr3 = get_cr3; g_context->get_pdptr = kvm_pdptr_read; g_context->inject_page_fault = kvm_inject_page_fault; -- 2.14.4