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=-21.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 9C8F8C433E0 for ; Sun, 7 Mar 2021 04:41:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5B71E64FC5 for ; Sun, 7 Mar 2021 04:41:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230139AbhCGEgX (ORCPT ); Sat, 6 Mar 2021 23:36:23 -0500 Received: from mail.kernel.org ([198.145.29.99]:59754 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230023AbhCGEfu (ORCPT ); Sat, 6 Mar 2021 23:35:50 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 56F4A650B1; Sun, 7 Mar 2021 04:35:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1615091750; bh=bGnLAzbseG7Hvf7WtaKuqW98AvCQaRA0f3+tjl5et9E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sFwb35J2J3JEUCV2LRfNrkdeFOfSy4v9lut+kKnrsezWVzqi7r4QweZekd8H9ONh5 Cn6vKiY2baFCmc18EBSCXD1sfuitp7kpTY5IOMdDQ449mxPdO6OrOemiSREy0cQT7f 11MkmSdeLdGyO5WiAv/NBsolD6PLwg8fm4DVlzmHwQtQ3ZlyOk2K2O7LYuf5QpYRP0 9DAA2Kahj0yKcN+hCBl81TFzC6qgWmyqe/8qgYooCNNtSRw/jOetQXT/LbzSzNpuSh 0TIvkSblicdnSpUtsr4ZYqfBiuMfd8P4Wmh+he7JxvDHNL5YxWfy6NY8zKWtuLTc13 oO7CIDNN2otAg== Date: Sat, 6 Mar 2021 21:35:45 -0700 From: Nathan Chancellor To: Sami Tolvanen Cc: Marc Zyngier , James Morse , Kees Cook , Catalin Marinas , Nick Desaulniers , linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Will Deacon Subject: Re: [PATCH] KVM: arm64: Don't use cbz/adr with external symbols Message-ID: <20210307043545.pyxy22z3rktgof4m@archlinux-ax161> References: <20210305202124.3768527-1-samitolvanen@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210305202124.3768527-1-samitolvanen@google.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 05, 2021 at 12:21:24PM -0800, Sami Tolvanen wrote: > allmodconfig + CONFIG_LTO_CLANG_THIN=y fails to build due to following > linker errors: > > ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21CC): > relocation R_AARCH64_CONDBR19 out of range: 2031220 is not in > [-1048576, 1048575]; references hyp_panic > >>> defined in vmlinux.o > > ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21E0): > relocation R_AARCH64_ADR_PREL_LO21 out of range: 2031200 is not in > [-1048576, 1048575]; references hyp_panic > >>> defined in vmlinux.o > > This is because with LTO, the compiler ends up placing hyp_panic() > more than 1MB away from __guest_enter(). Use an unconditional branch > and adr_l instead to fix the issue. > > Link: https://github.com/ClangBuiltLinux/linux/issues/1317 > Reported-by: Nathan Chancellor > Suggested-by: Marc Zyngier > Suggested-by: Ard Biesheuvel > Signed-off-by: Sami Tolvanen I booted an kernel with this patch in it on my Raspberry Pi 4 and booted a kernel under KVM without any issues. Tested-by: Nathan Chancellor > --- > arch/arm64/kvm/hyp/entry.S | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S > index b0afad7a99c6..c62265951467 100644 > --- a/arch/arm64/kvm/hyp/entry.S > +++ b/arch/arm64/kvm/hyp/entry.S > @@ -85,8 +85,10 @@ SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) > > // If the hyp context is loaded, go straight to hyp_panic > get_loaded_vcpu x0, x1 > - cbz x0, hyp_panic > + cbnz x0, 1f > + b hyp_panic > > +1: > // The hyp context is saved so make sure it is restored to allow > // hyp_panic to run at hyp and, subsequently, panic to run in the host. > // This makes use of __guest_exit to avoid duplication but sets the > @@ -94,7 +96,7 @@ SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) > // current state is saved to the guest context but it will only be > // accurate if the guest had been completely restored. > adr_this_cpu x0, kvm_hyp_ctxt, x1 > - adr x1, hyp_panic > + adr_l x1, hyp_panic > str x1, [x0, #CPU_XREG_OFFSET(30)] > > get_vcpu_ptr x1, x0 > > base-commit: 280d542f6ffac0e6d65dc267f92191d509b13b64 > -- > 2.30.1.766.gb4fecdf3b7-goog > > _______________________________________________ > kvmarm mailing list > kvmarm@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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=-18.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 EEE14C433DB for ; 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Mon, 8 Mar 2021 15:08:54 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id EB45A4B2A7 for ; Sat, 6 Mar 2021 23:35:55 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id mM06e+vE-w8r for ; Sat, 6 Mar 2021 23:35:52 -0500 (EST) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 21AE34B2A2 for ; Sat, 6 Mar 2021 23:35:52 -0500 (EST) Received: by mail.kernel.org (Postfix) with ESMTPSA id 56F4A650B1; Sun, 7 Mar 2021 04:35:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1615091750; bh=bGnLAzbseG7Hvf7WtaKuqW98AvCQaRA0f3+tjl5et9E=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sFwb35J2J3JEUCV2LRfNrkdeFOfSy4v9lut+kKnrsezWVzqi7r4QweZekd8H9ONh5 Cn6vKiY2baFCmc18EBSCXD1sfuitp7kpTY5IOMdDQ449mxPdO6OrOemiSREy0cQT7f 11MkmSdeLdGyO5WiAv/NBsolD6PLwg8fm4DVlzmHwQtQ3ZlyOk2K2O7LYuf5QpYRP0 9DAA2Kahj0yKcN+hCBl81TFzC6qgWmyqe/8qgYooCNNtSRw/jOetQXT/LbzSzNpuSh 0TIvkSblicdnSpUtsr4ZYqfBiuMfd8P4Wmh+he7JxvDHNL5YxWfy6NY8zKWtuLTc13 oO7CIDNN2otAg== Date: Sat, 6 Mar 2021 21:35:45 -0700 From: Nathan Chancellor To: Sami Tolvanen Subject: Re: [PATCH] KVM: arm64: Don't use cbz/adr with external symbols Message-ID: <20210307043545.pyxy22z3rktgof4m@archlinux-ax161> References: <20210305202124.3768527-1-samitolvanen@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210305202124.3768527-1-samitolvanen@google.com> X-Mailman-Approved-At: Mon, 08 Mar 2021 15:08:53 -0500 Cc: Kees Cook , Marc Zyngier , Nick Desaulniers , linux-kernel@vger.kernel.org, Catalin Marinas , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Fri, Mar 05, 2021 at 12:21:24PM -0800, Sami Tolvanen wrote: > allmodconfig + CONFIG_LTO_CLANG_THIN=y fails to build due to following > linker errors: > > ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21CC): > relocation R_AARCH64_CONDBR19 out of range: 2031220 is not in > [-1048576, 1048575]; references hyp_panic > >>> defined in vmlinux.o > > ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21E0): > relocation R_AARCH64_ADR_PREL_LO21 out of range: 2031200 is not in > [-1048576, 1048575]; references hyp_panic > >>> defined in vmlinux.o > > This is because with LTO, the compiler ends up placing hyp_panic() > more than 1MB away from __guest_enter(). Use an unconditional branch > and adr_l instead to fix the issue. > > Link: https://github.com/ClangBuiltLinux/linux/issues/1317 > Reported-by: Nathan Chancellor > Suggested-by: Marc Zyngier > Suggested-by: Ard Biesheuvel > Signed-off-by: Sami Tolvanen I booted an kernel with this patch in it on my Raspberry Pi 4 and booted a kernel under KVM without any issues. Tested-by: Nathan Chancellor > --- > arch/arm64/kvm/hyp/entry.S | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S > index b0afad7a99c6..c62265951467 100644 > --- a/arch/arm64/kvm/hyp/entry.S > +++ b/arch/arm64/kvm/hyp/entry.S > @@ -85,8 +85,10 @@ SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) > > // If the hyp context is loaded, go straight to hyp_panic > get_loaded_vcpu x0, x1 > - cbz x0, hyp_panic > + cbnz x0, 1f > + b hyp_panic > > +1: > // The hyp context is saved so make sure it is restored to allow > // hyp_panic to run at hyp and, subsequently, panic to run in the host. > // This makes use of __guest_exit to avoid duplication but sets the > @@ -94,7 +96,7 @@ SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) > // current state is saved to the guest context but it will only be > // accurate if the guest had been completely restored. > adr_this_cpu x0, kvm_hyp_ctxt, x1 > - adr x1, hyp_panic > + adr_l x1, hyp_panic > str x1, [x0, #CPU_XREG_OFFSET(30)] > > get_vcpu_ptr x1, x0 > > base-commit: 280d542f6ffac0e6d65dc267f92191d509b13b64 > -- > 2.30.1.766.gb4fecdf3b7-goog > > _______________________________________________ > kvmarm mailing list > kvmarm@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm 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=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS 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 3DEE2C433DB for ; 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h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=sFwb35J2J3JEUCV2LRfNrkdeFOfSy4v9lut+kKnrsezWVzqi7r4QweZekd8H9ONh5 Cn6vKiY2baFCmc18EBSCXD1sfuitp7kpTY5IOMdDQ449mxPdO6OrOemiSREy0cQT7f 11MkmSdeLdGyO5WiAv/NBsolD6PLwg8fm4DVlzmHwQtQ3ZlyOk2K2O7LYuf5QpYRP0 9DAA2Kahj0yKcN+hCBl81TFzC6qgWmyqe/8qgYooCNNtSRw/jOetQXT/LbzSzNpuSh 0TIvkSblicdnSpUtsr4ZYqfBiuMfd8P4Wmh+he7JxvDHNL5YxWfy6NY8zKWtuLTc13 oO7CIDNN2otAg== Date: Sat, 6 Mar 2021 21:35:45 -0700 From: Nathan Chancellor To: Sami Tolvanen Cc: Marc Zyngier , James Morse , Kees Cook , Catalin Marinas , Nick Desaulniers , linux-kernel@vger.kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, Will Deacon Subject: Re: [PATCH] KVM: arm64: Don't use cbz/adr with external symbols Message-ID: <20210307043545.pyxy22z3rktgof4m@archlinux-ax161> References: <20210305202124.3768527-1-samitolvanen@google.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20210305202124.3768527-1-samitolvanen@google.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210307_043554_267968_923C1BDD X-CRM114-Status: GOOD ( 22.46 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Mar 05, 2021 at 12:21:24PM -0800, Sami Tolvanen wrote: > allmodconfig + CONFIG_LTO_CLANG_THIN=y fails to build due to following > linker errors: > > ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21CC): > relocation R_AARCH64_CONDBR19 out of range: 2031220 is not in > [-1048576, 1048575]; references hyp_panic > >>> defined in vmlinux.o > > ld.lld: error: irqbypass.c:(function __guest_enter: .text+0x21E0): > relocation R_AARCH64_ADR_PREL_LO21 out of range: 2031200 is not in > [-1048576, 1048575]; references hyp_panic > >>> defined in vmlinux.o > > This is because with LTO, the compiler ends up placing hyp_panic() > more than 1MB away from __guest_enter(). Use an unconditional branch > and adr_l instead to fix the issue. > > Link: https://github.com/ClangBuiltLinux/linux/issues/1317 > Reported-by: Nathan Chancellor > Suggested-by: Marc Zyngier > Suggested-by: Ard Biesheuvel > Signed-off-by: Sami Tolvanen I booted an kernel with this patch in it on my Raspberry Pi 4 and booted a kernel under KVM without any issues. Tested-by: Nathan Chancellor > --- > arch/arm64/kvm/hyp/entry.S | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/hyp/entry.S b/arch/arm64/kvm/hyp/entry.S > index b0afad7a99c6..c62265951467 100644 > --- a/arch/arm64/kvm/hyp/entry.S > +++ b/arch/arm64/kvm/hyp/entry.S > @@ -85,8 +85,10 @@ SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) > > // If the hyp context is loaded, go straight to hyp_panic > get_loaded_vcpu x0, x1 > - cbz x0, hyp_panic > + cbnz x0, 1f > + b hyp_panic > > +1: > // The hyp context is saved so make sure it is restored to allow > // hyp_panic to run at hyp and, subsequently, panic to run in the host. > // This makes use of __guest_exit to avoid duplication but sets the > @@ -94,7 +96,7 @@ SYM_INNER_LABEL(__guest_exit_panic, SYM_L_GLOBAL) > // current state is saved to the guest context but it will only be > // accurate if the guest had been completely restored. > adr_this_cpu x0, kvm_hyp_ctxt, x1 > - adr x1, hyp_panic > + adr_l x1, hyp_panic > str x1, [x0, #CPU_XREG_OFFSET(30)] > > get_vcpu_ptr x1, x0 > > base-commit: 280d542f6ffac0e6d65dc267f92191d509b13b64 > -- > 2.30.1.766.gb4fecdf3b7-goog > > _______________________________________________ > kvmarm mailing list > kvmarm@lists.cs.columbia.edu > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel