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 21A5DC4363D for ; Fri, 9 Oct 2020 16:15:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D8F5A22280 for ; Fri, 9 Oct 2020 16:15:47 +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 S2389911AbgJIQPq (ORCPT ); Fri, 9 Oct 2020 12:15:46 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41626 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389829AbgJIQOw (ORCPT ); Fri, 9 Oct 2020 12:14:52 -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 AFAD1C0613E6 for ; Fri, 9 Oct 2020 09:14:27 -0700 (PDT) Received: by mail-qt1-x84a.google.com with SMTP id a16so6838763qtj.7 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=pcOby0r+//+jEDz2QC07BLqQVNw6xYNTQxWFdWYNQV7OZ+WjNKh+CTpjr72sZ5JV0U Z/Wm3Tl122NmFSGXWwNUQSyXy+PYWQp+FV7RL2btVastAQQPql8F4cgpUUXxJReftJBc kGamngRv+/xFDMXiN8xfDx1jHj05bpSrKm/KCCJMfWStI+6fUPERSPaBwA10cjTHNmxX u+iIXlI61wYBqJxWQZJIRAdCtWQpycE3MFoGnShAjsGZDS2pSRAIQYYykc7c7vDjN21R trKTyyn/x+JtHl9BYQRZDeDVLFh2QCklEKb8t7hR7FAzlI/yv/v1eCjt7tzjZsPhjXaR C+Bw== X-Gm-Message-State: AOAM5315+CkpfRWyded62E0KbmTklfUx/PvnjpxP3mFNfpcrFQ/xJjqB oUJA1hVkbL3URtqzJmpan3vMofEmtKQa87NqcT4= 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-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 -- 2.28.0.1011.ga647a8990f-goog