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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT,USER_IN_DEF_DKIM_WL 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 4EE0AC433DF for ; Fri, 9 Oct 2020 16:15:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1B57A22280 for ; Fri, 9 Oct 2020 16:15:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="hLqKbNF2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389903AbgJIQP2 (ORCPT ); Fri, 9 Oct 2020 12:15:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41574 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389840AbgJIQOy (ORCPT ); Fri, 9 Oct 2020 12:14:54 -0400 Received: from mail-qt1-x84a.google.com (mail-qt1-x84a.google.com [IPv6:2607:f8b0:4864:20::84a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B1122C0613A7 for ; Fri, 9 Oct 2020 09:14:27 -0700 (PDT) Received: by mail-qt1-x84a.google.com with SMTP id n8so6824660qtf.10 for ; Fri, 09 Oct 2020 09:14:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=Et6zTjz3rLwF/ItBI285hLUQ1f4GO0wd9iXT0eGoats=; b=hLqKbNF2l/HYOLCmWO8LMR1Uka12gSYz+AhlYm3DhRPL1fLs1dqzgWcxHxLzH/tZup gPnuymUDkXuAc3XIouGPBl/8T1D9Bq3u8jG17jrp2vSb0X7xbVT7014aW5js5Evi+PN3 kKq8Au1B/gTOGttR3rccDlmrr+eH/zq2d6aYrZsLtb2MQbJ36nj/aUKfg72cXmKRuCd1 7W0h22twgcbXNdk0LlNmNDt5u3BwGoQ5OGeQI2TU/FzlveqBrl5YUYIEveqDRG1UMD5e GdFmF67K9M+DZq777bIKNPeg4Db6qpIFUOK6o+EmyYf4xc69CphrXuFUAoqVvoIG7cn6 VIkA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=Et6zTjz3rLwF/ItBI285hLUQ1f4GO0wd9iXT0eGoats=; b=OlwRhrQ4z4r/ePQ3GQVfqBmaR/e+U2ER3pwchkvBLDpC0suYSObnAbibwtAErpQpLH 4jdTlAk8HMSEYEQ1nPFiUQeOCwbCpAotjYXzSlgZjvtfUOci/KFFHuT6tgCBVoNDEpCg oPAoorKPeYgLjPlQQmnp/aaMxErkrAd+tZ/Fx/JDadpPW5Qrk08KXqDad6XrLsbOLJpc EsuW/+bjzECwH4+mKkbZC9z+oefXos7kE7IFIQdYxyhA6qJvPzInyGIn/d9EDoQL2kB7 5lfIcIzlyU7YX0rEOpRgf+aGHXj2brjFvCv2jNZSblnZq+kVUTcv2l5QkO/EgMaV93qv T0mA== X-Gm-Message-State: AOAM533EsyVvll7kxM1bxEKWxYv9U06lCt52c+Kts6sgMnYU3GTcQfzF qcBRQ7kMWXu/nQPH+g2WbbF6r8gTukHLhitBEb8= X-Google-Smtp-Source: ABdhPJx3xuV21n1yE2Lye3nQEPP50bMJ0EgQCylMeDfKaqKItuqqn+slZ4N1DGo94IMuiaWaihoXxmQJwU6XAlrqwU0= Sender: "samitolvanen via sendgmr" X-Received: from samitolvanen1.mtv.corp.google.com ([2620:15c:201:2:f693:9fff:fef4:1b6d]) (user=samitolvanen job=sendgmr) by 2002:ad4:544a:: with SMTP id h10mr13840738qvt.35.1602260066836; Fri, 09 Oct 2020 09:14:26 -0700 (PDT) Date: Fri, 9 Oct 2020 09:13:32 -0700 In-Reply-To: <20201009161338.657380-1-samitolvanen@google.com> Message-Id: <20201009161338.657380-24-samitolvanen@google.com> Mime-Version: 1.0 References: <20201009161338.657380-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.1011.ga647a8990f-goog Subject: [PATCH v5 23/29] KVM: arm64: disable LTO for the nVHE directory From: Sami Tolvanen To: Masahiro Yamada , Will Deacon , Steven Rostedt Cc: Peter Zijlstra , Greg Kroah-Hartman , "Paul E. McKenney" , Kees Cook , Nick Desaulniers , clang-built-linux@googlegroups.com, kernel-hardening@lists.openwall.com, linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, linux-pci@vger.kernel.org, x86@kernel.org, Sami Tolvanen Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We use objcopy to manipulate ELF binaries for the nVHE code, which fails with LTO as the compiler produces LLVM bitcode instead. Disable LTO for this code to allow objcopy to be used. Signed-off-by: Sami Tolvanen Reviewed-by: Kees Cook --- arch/arm64/kvm/hyp/nvhe/Makefile | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm64/kvm/hyp/nvhe/Makefile b/arch/arm64/kvm/hyp/nvhe/Makefile index aef76487edc2..c903c8f31280 100644 --- a/arch/arm64/kvm/hyp/nvhe/Makefile +++ b/arch/arm64/kvm/hyp/nvhe/Makefile @@ -45,9 +45,9 @@ quiet_cmd_hypcopy = HYPCOPY $@ --rename-section=.text=.hyp.text \ $< $@ -# Remove ftrace and Shadow Call Stack CFLAGS. +# Remove ftrace, LTO, and Shadow Call Stack CFLAGS. # This is equivalent to the 'notrace' and '__noscs' annotations. -KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) +KBUILD_CFLAGS := $(filter-out $(CC_FLAGS_FTRACE) $(CC_FLAGS_LTO) $(CC_FLAGS_SCS), $(KBUILD_CFLAGS)) # KVM nVHE code is run at a different exception code with a different map, so # compiler instrumentation that inserts callbacks or checks into the code may -- 2.28.0.1011.ga647a8990f-goog