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=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 0265CC43463 for ; Fri, 18 Sep 2020 20:15:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9AC2023447 for ; Fri, 18 Sep 2020 20:15:53 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="REd95VnF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726205AbgIRUPo (ORCPT ); Fri, 18 Sep 2020 16:15:44 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53006 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726660AbgIRUPm (ORCPT ); Fri, 18 Sep 2020 16:15:42 -0400 Received: from mail-yb1-xb49.google.com (mail-yb1-xb49.google.com [IPv6:2607:f8b0:4864:20::b49]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3A552C0613D4 for ; Fri, 18 Sep 2020 13:15:42 -0700 (PDT) Received: by mail-yb1-xb49.google.com with SMTP id d15so6783283ybk.0 for ; Fri, 18 Sep 2020 13:15:42 -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=oXJMXy02LqTQDpBkn8PPtjYwJPq4evUojZhZLMc3uvo=; b=REd95VnFXwmD3ND7Lapf6wTEKHlyfaSDlXa6A5g8OMe6rD7mXFuEioeTzTVuP+wKYy krseyNRuMtJa9ctfWr2TjaEjNcbStkBCBOxYrTttidotv9Qbdv5f70T8rfirifUlhiGO fbpwKXewIVSjSWcELClY8rHyvPgkF2XdC/QZF4KVfiVKi0xCd18r7fnei+hqOeW0nZel JhxqIwpbgtSIJrJ5e9QQl5CT7x9s7Yh2DeXazsVf3ebafU4M8/COaXTHkTmNbs2X65vv uvYLZii0pQgCywSqGr9bhM6Jz3cwSDm+sYfUU2OyMAh4+XaJbe4V1f+DGOyRxBJY+8Ct N4eQ== 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=oXJMXy02LqTQDpBkn8PPtjYwJPq4evUojZhZLMc3uvo=; b=hgbW3/rLcPKrfHn7RSZmHjQ7OiHVYbVQn/mnuQm48ctwrxEURk4tp03Tg6ZKqFCLgk KNM1rLEnlAChcpT7T0AbtWnRhgJMrt/NoSufIDdl6zNSj4oUskmrtQi8e8fsu1OoiG9g 54GtY5txZLdBcbHC1dLkKUU5vVKs0XdOT9LpjtfovzSmLmKU8cIYM1n7XqcoUAevJwJP pLaIQhMP6y2aejEi307pYwfGo8IGb2TcALs1omDvGo+LB5gYAG3hxZ0l7PJGft0nUsWs 8MIsGTO9gdg7tgPnRHt/r5q+RyCfppNso+gOlCCxeZBhQutfQhGV53V1SUNgOsP/YZbq Y2iw== X-Gm-Message-State: AOAM530aWjHV4f6YS8IR6lvj4+f0EQOMm9SHEVdvRdjYTLY3C5LRArW5 d/6ahWpH7+7Qm72ySQf/whSiDN4R7lemcDlqVvM= X-Google-Smtp-Source: ABdhPJxMyDngZuNnNx1wL9/fMd7ntfJVtVGTW6/hjVnBGEbXwyy4OggBNEJrH2U3qB1vnImsc26NsteebpxVgOTzfOI= 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:a25:14c4:: with SMTP id 187mr54928163ybu.449.1600460141424; Fri, 18 Sep 2020 13:15:41 -0700 (PDT) Date: Fri, 18 Sep 2020 13:14:32 -0700 In-Reply-To: <20200918201436.2932360-1-samitolvanen@google.com> Message-Id: <20200918201436.2932360-27-samitolvanen@google.com> Mime-Version: 1.0 References: <20200918201436.2932360-1-samitolvanen@google.com> X-Mailer: git-send-email 2.28.0.681.g6f77f65b4e-goog Subject: [PATCH v3 26/30] KVM: arm64: disable LTO for the nVHE directory From: Sami Tolvanen To: Masahiro Yamada , Will Deacon Cc: Peter Zijlstra , Steven Rostedt , 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-arch@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 -- 2.28.0.681.g6f77f65b4e-goog