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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=gBCfeO7FJgmNeBoubmfg3mKiHJk2cvDZ832z8NYAT1X8rS0tqcL4dtEIcPOp7x0CH+ xpPLSXPdhmgdZK7hio/PoVIeSuGuIi9cDGSyjQ5bMri1OtoGh18ubrWeGWceqA3BH6PV FaN3oFpvqQwD6Heq8dzVW8hHhbLkFzSVLV/ZamHWr2TTo8QE9VQeh8F+XjZGqOjPzU2C Ul7J8npjLHQeXZyouM9FYLBslTil1BOyZpBfgPK1NF6SD7DsTV5z+kUWr1kJJ5g0vkk6 DtD2fBLfB1SxME5jZWbD+Yt1ubjef7tlDa61rsv5F1xQ/UDN14mYiuzzNl1rum1C3IEJ GfGA== X-Gm-Message-State: AOAM531huyvHrVVVawN143CXsSMBD6nQVr/vCWwYBrqYRi5N3Nbyn5WB 2gGF+WI+FyUAmtOnFKa61Zvt3dRWZrJx86lM4zw= X-Google-Smtp-Source: ABdhPJx3xuV21n1yE2Lye3nQEPP50bMJ0EgQCylMeDfKaqKItuqqn+slZ4N1DGo94IMuiaWaihoXxmQJwU6XAlrqwU0= 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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201009_121431_061425_4465039B X-CRM114-Status: GOOD ( 14.05 ) X-Spam-Score: -7.7 (-------) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-7.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [2607:f8b0:4864:20:0:0:0:84a listed in] [list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record -7.5 USER_IN_DEF_DKIM_WL From: address is in the default DKIM white-list 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.0 DKIMWL_WL_MED DKIMwl.org - Medium trust sender X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-arch@vger.kernel.org, x86@kernel.org, Kees Cook , "Paul E. McKenney" , kernel-hardening@lists.openwall.com, Peter Zijlstra , Greg Kroah-Hartman , linux-kbuild@vger.kernel.org, Nick Desaulniers , linux-kernel@vger.kernel.org, clang-built-linux@googlegroups.com, Sami Tolvanen , linux-pci@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.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