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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1EE88C433F5 for ; Sat, 23 Apr 2022 03:49:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233016AbiDWDv7 (ORCPT ); Fri, 22 Apr 2022 23:51:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55766 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232790AbiDWDvV (ORCPT ); Fri, 22 Apr 2022 23:51:21 -0400 Received: from mail-pg1-x54a.google.com (mail-pg1-x54a.google.com [IPv6:2607:f8b0:4864:20::54a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 227CA1C58ED for ; Fri, 22 Apr 2022 20:48:25 -0700 (PDT) Received: by mail-pg1-x54a.google.com with SMTP id 64-20020a630843000000b0039d909676d5so6041435pgi.16 for ; Fri, 22 Apr 2022 20:48:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=reply-to:date:in-reply-to:message-id:mime-version:references :subject:from:to:cc; bh=nIl4luVOJWFkIclprxcKdIn+QCEjsjA9FteQ7s7ZGic=; b=Jks/1SdRI93xyP5uwMJ6C+K0aagltFg0tPscYlPq2RulXCzDR9bwmd/2YFjWammzja RnmNJkbEImsLiYjDKXLFudnHmutWlf9LMoek0VRl7qtsD7Dt5gjHzM1GsTD+er3aHqe8 MyT0brKKquYdYgfR8hs28aTTvGl/5qXrE9GpOB0UIQPx+HdOQFo5cmvsblUiIPmNMR7t yGpq5BqTYAM1ST6Nx38oijcHR1KOwDrkNel658nL/5Dp5prtpqXGwrmxWGW78ByFcMxs +cDcAPTc7KEyWzhNoETs7kOxhnjOXZE+G8XKpf1xP2kxi+DaHPPwXT03r+cn6ouNMshM on1A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:reply-to:date:in-reply-to:message-id :mime-version:references:subject:from:to:cc; bh=nIl4luVOJWFkIclprxcKdIn+QCEjsjA9FteQ7s7ZGic=; b=rO8lU07FI3MARFW8ga2ymPS8Lgd/mpWz+MQWfeKXb0jz0IMYYeUaUJkTWpjPJSoQ80 YG+b/Kkr9RZX9OFPPOnh3RlMh93AFhc+999iWAP86TWGuz80lJm0otO6CCDgCqlXoHvy NgsJ9c1jiTkkMo4Frz4ZOyS3gQMjDe/sd+A9mc8AWv5EZK4H8SZGK/6XJfSRSUhg4jaF iOqlSqHTvee3Hv2rEvm4pbk0qQquD7qPqHcsRBnzKdxJTfTdCnftcNduIvygRWJKjC+A 4HafYAAaZ4fNHVBKl713OwgiW1t3rBNcyrOzhLAw044INl7EKo9GUJ4o4pGCfEPWsxa6 npEg== X-Gm-Message-State: AOAM530YE5k9Gd6d2IV+axwnKstwE68Ig5TiOU8BZzVqiDHGuNPEP2to ffLp7AUBDXDDFNXdR2bNlvx8qIGEVPc= X-Google-Smtp-Source: ABdhPJz28rMsOFWsoRfGTKdC9uqo+Oi0ikmXtSwLqUR7BvCyXYi01bop8+pSXl7ackmkhJjqc0UalBUIsOE= X-Received: from seanjc.c.googlers.com ([fda3:e722:ac3:cc00:7f:e700:c0a8:3e5]) (user=seanjc job=sendgmr) by 2002:a05:6a00:14c4:b0:50a:9524:67bf with SMTP id w4-20020a056a0014c400b0050a952467bfmr8129386pfu.55.1650685704656; Fri, 22 Apr 2022 20:48:24 -0700 (PDT) Reply-To: Sean Christopherson Date: Sat, 23 Apr 2022 03:47:48 +0000 In-Reply-To: <20220423034752.1161007-1-seanjc@google.com> Message-Id: <20220423034752.1161007-9-seanjc@google.com> Mime-Version: 1.0 References: <20220423034752.1161007-1-seanjc@google.com> X-Mailer: git-send-email 2.36.0.rc2.479.g8af0fa9b8e-goog Subject: [PATCH 08/12] KVM: x86/mmu: Use IS_ENABLED() to avoid RETPOLINE for TDP page faults 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, Ben Gardon , David Matlack , Venkatesh Srinivas , Chao Peng Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use IS_ENABLED() instead of an #ifdef to activate the anti-RETPOLINE fast path for TDP page faults. The generated code is identical, and the #ifdef makes it dangerously difficult to extend the logic (guess who forgot to add an "else" inside the #ifdef and ran through the page fault handler twice). No functional or binary change intented. Signed-off-by: Sean Christopherson --- arch/x86/kvm/mmu/mmu_internal.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/arch/x86/kvm/mmu/mmu_internal.h b/arch/x86/kvm/mmu/mmu_internal.h index c0c85cbfa159..9caa747ee033 100644 --- a/arch/x86/kvm/mmu/mmu_internal.h +++ b/arch/x86/kvm/mmu/mmu_internal.h @@ -248,10 +248,10 @@ static inline int kvm_mmu_do_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, .req_level = PG_LEVEL_4K, .goal_level = PG_LEVEL_4K, }; -#ifdef CONFIG_RETPOLINE - if (fault.is_tdp) + + if (IS_ENABLED(CONFIG_RETPOLINE) && fault.is_tdp) return kvm_tdp_page_fault(vcpu, &fault); -#endif + return vcpu->arch.mmu->page_fault(vcpu, &fault); } -- 2.36.0.rc2.479.g8af0fa9b8e-goog