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=-8.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_2 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 2F7F6C47255 for ; Mon, 11 May 2020 10:05:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 06B3C20731 for ; Mon, 11 May 2020 10:05:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589191509; bh=E+mKJuj4Us4haykExfdIq1d4iuKiBTncDiuwyBJJnZc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=X8xkhkn9B9Vflw+KOAleFPMW6y3NL7TLxtppTIEfxHYiflqKMMU1Mbxgft2OtGfGH ibL1zMXxPcivgrAeZae3SZiTjysR49SDIFds7tL9W62GmCSk2gnuSO/JDwkwkIcZD3 M2QFqrPB0c9sce7kTD6bIx/Zo4mXHJVoAmKgE7gY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729160AbgEKKFI (ORCPT ); Mon, 11 May 2020 06:05:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:44458 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725983AbgEKKFH (ORCPT ); Mon, 11 May 2020 06:05:07 -0400 Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3830A20720; Mon, 11 May 2020 10:05:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589191507; bh=E+mKJuj4Us4haykExfdIq1d4iuKiBTncDiuwyBJJnZc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=1S0hrvTORHavnYfk4jkXveWVsUk0xbGEJVQZsRkrry5xEex0cvkimVVGxCe0Hmt5B 0n/tbrjMbMdVgy7z8oRCBt+p+SbF7wUN+GjxzAl1KbzbHl3iI5242omiq7ruIyZERe G15b9BhKyOWEW2AWn57vy8AkaZGqD2jSPLN6iTPQ= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jY5J3-00BFK0-KQ; Mon, 11 May 2020 11:05:05 +0100 Date: Mon, 11 May 2020 11:04:59 +0100 From: Marc Zyngier To: David Brazdil Cc: Catalin Marinas , James Morse , Julien Thierry , Suzuki K Poulose , Will Deacon , kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 06/15] arm64: kvm: Move __smccc_workaround_1_smc to .rodata Message-ID: <20200511110459.1fcf4db7@why> In-Reply-To: <20200430144831.59194-7-dbrazdil@google.com> References: <20200430144831.59194-1-dbrazdil@google.com> <20200430144831.59194-7-dbrazdil@google.com> Organization: Approximate X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: dbrazdil@google.com, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, 30 Apr 2020 15:48:22 +0100 David Brazdil wrote: > This snippet of assembly is used by cpu_errata.c to overwrite parts of KVM hyp > vector. It is never directly executed, so move it from .text to .rodata. > > Signed-off-by: David Brazdil > --- > arch/arm64/kvm/hyp/hyp-entry.S | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S > index 5986e1d78d3f..7e5f386c5c2d 100644 > --- a/arch/arm64/kvm/hyp/hyp-entry.S > +++ b/arch/arm64/kvm/hyp/hyp-entry.S > @@ -364,6 +364,11 @@ SYM_CODE_END(__bp_harden_hyp_vecs) > .popsection > > #ifndef __HYPERVISOR__ > + /* > + * This is not executed directly and is instead copied into the vectors > + * by install_bp_hardening_cb(). > + */ > + .pushsection .rodata > SYM_CODE_START(__smccc_workaround_1_smc) I wonder whether we should keep the SYM_CODE_START() annotation or not. It feels weird to say "code" in a rodata section, and the alignment doesn't matter as we copy it in place, as you noticed. > esb > sub sp, sp, #(8 * 4) > @@ -377,5 +382,6 @@ SYM_CODE_START(__smccc_workaround_1_smc) > 1: .org __smccc_workaround_1_smc + __SMCCC_WORKAROUND_1_SMC_SZ > .org 1b > SYM_CODE_END(__smccc_workaround_1_smc) > + .popsection > #endif /* __HYPERVISOR__ */ > #endif /* CONFIG_KVM_INDIRECT_VECTORS */ Otherwise, looks good. Thanks, M. -- Jazz is not dead. It just smells funny... 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=-8.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_2 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 53CD4C54E4B for ; Mon, 11 May 2020 10:05:17 +0000 (UTC) Received: from mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by mail.kernel.org (Postfix) with ESMTP id CB8512082E for ; Mon, 11 May 2020 10:05:16 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="1S0hrvTO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org CB8512082E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=kvmarm-bounces@lists.cs.columbia.edu Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 4FD384B0B3; Mon, 11 May 2020 06:05:16 -0400 (EDT) X-Virus-Scanned: at lists.cs.columbia.edu Authentication-Results: mm01.cs.columbia.edu (amavisd-new); dkim=softfail (fail, message has been altered) header.i=@kernel.org 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 AVnAxpsqEbwW; Mon, 11 May 2020 06:05:10 -0400 (EDT) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 87FDB4B0A1; Mon, 11 May 2020 06:05:10 -0400 (EDT) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 808504B0A1 for ; Mon, 11 May 2020 06:05:09 -0400 (EDT) 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 4t7LHmiYF+QB for ; Mon, 11 May 2020 06:05:08 -0400 (EDT) Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id 678004B0A0 for ; Mon, 11 May 2020 06:05:08 -0400 (EDT) Received: from disco-boy.misterjones.org (disco-boy.misterjones.org [51.254.78.96]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 3830A20720; Mon, 11 May 2020 10:05:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589191507; bh=E+mKJuj4Us4haykExfdIq1d4iuKiBTncDiuwyBJJnZc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=1S0hrvTORHavnYfk4jkXveWVsUk0xbGEJVQZsRkrry5xEex0cvkimVVGxCe0Hmt5B 0n/tbrjMbMdVgy7z8oRCBt+p+SbF7wUN+GjxzAl1KbzbHl3iI5242omiq7ruIyZERe G15b9BhKyOWEW2AWn57vy8AkaZGqD2jSPLN6iTPQ= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jY5J3-00BFK0-KQ; Mon, 11 May 2020 11:05:05 +0100 Date: Mon, 11 May 2020 11:04:59 +0100 From: Marc Zyngier To: David Brazdil Subject: Re: [PATCH 06/15] arm64: kvm: Move __smccc_workaround_1_smc to .rodata Message-ID: <20200511110459.1fcf4db7@why> In-Reply-To: <20200430144831.59194-7-dbrazdil@google.com> References: <20200430144831.59194-1-dbrazdil@google.com> <20200430144831.59194-7-dbrazdil@google.com> Organization: Approximate X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: dbrazdil@google.com, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Cc: Catalin Marinas , linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Will Deacon , kvmarm@lists.cs.columbia.edu 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 Thu, 30 Apr 2020 15:48:22 +0100 David Brazdil wrote: > This snippet of assembly is used by cpu_errata.c to overwrite parts of KVM hyp > vector. It is never directly executed, so move it from .text to .rodata. > > Signed-off-by: David Brazdil > --- > arch/arm64/kvm/hyp/hyp-entry.S | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S > index 5986e1d78d3f..7e5f386c5c2d 100644 > --- a/arch/arm64/kvm/hyp/hyp-entry.S > +++ b/arch/arm64/kvm/hyp/hyp-entry.S > @@ -364,6 +364,11 @@ SYM_CODE_END(__bp_harden_hyp_vecs) > .popsection > > #ifndef __HYPERVISOR__ > + /* > + * This is not executed directly and is instead copied into the vectors > + * by install_bp_hardening_cb(). > + */ > + .pushsection .rodata > SYM_CODE_START(__smccc_workaround_1_smc) I wonder whether we should keep the SYM_CODE_START() annotation or not. It feels weird to say "code" in a rodata section, and the alignment doesn't matter as we copy it in place, as you noticed. > esb > sub sp, sp, #(8 * 4) > @@ -377,5 +382,6 @@ SYM_CODE_START(__smccc_workaround_1_smc) > 1: .org __smccc_workaround_1_smc + __SMCCC_WORKAROUND_1_SMC_SZ > .org 1b > SYM_CODE_END(__smccc_workaround_1_smc) > + .popsection > #endif /* __HYPERVISOR__ */ > #endif /* CONFIG_KVM_INDIRECT_VECTORS */ Otherwise, looks good. Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ 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=-8.7 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_2 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 8814AC47255 for ; Mon, 11 May 2020 10:05:11 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4319920720 for ; Mon, 11 May 2020 10:05:11 +0000 (UTC) Authentication-Results: mail.kernel.org; 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Mon, 11 May 2020 10:05:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1589191507; bh=E+mKJuj4Us4haykExfdIq1d4iuKiBTncDiuwyBJJnZc=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=1S0hrvTORHavnYfk4jkXveWVsUk0xbGEJVQZsRkrry5xEex0cvkimVVGxCe0Hmt5B 0n/tbrjMbMdVgy7z8oRCBt+p+SbF7wUN+GjxzAl1KbzbHl3iI5242omiq7ruIyZERe G15b9BhKyOWEW2AWn57vy8AkaZGqD2jSPLN6iTPQ= Received: from 78.163-31-62.static.virginmediabusiness.co.uk ([62.31.163.78] helo=why) by disco-boy.misterjones.org with esmtpsa (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1jY5J3-00BFK0-KQ; Mon, 11 May 2020 11:05:05 +0100 Date: Mon, 11 May 2020 11:04:59 +0100 From: Marc Zyngier To: David Brazdil Subject: Re: [PATCH 06/15] arm64: kvm: Move __smccc_workaround_1_smc to .rodata Message-ID: <20200511110459.1fcf4db7@why> In-Reply-To: <20200430144831.59194-7-dbrazdil@google.com> References: <20200430144831.59194-1-dbrazdil@google.com> <20200430144831.59194-7-dbrazdil@google.com> Organization: Approximate X-Mailer: Claws Mail 3.17.5 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 X-SA-Exim-Connect-IP: 62.31.163.78 X-SA-Exim-Rcpt-To: dbrazdil@google.com, catalin.marinas@arm.com, james.morse@arm.com, julien.thierry.kdev@gmail.com, suzuki.poulose@arm.com, will@kernel.org, kvmarm@lists.cs.columbia.edu, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200511_030508_329462_17B3B3F4 X-CRM114-Status: GOOD ( 17.89 ) 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: Suzuki K Poulose , Catalin Marinas , linux-kernel@vger.kernel.org, James Morse , linux-arm-kernel@lists.infradead.org, Will Deacon , kvmarm@lists.cs.columbia.edu, Julien Thierry Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Thu, 30 Apr 2020 15:48:22 +0100 David Brazdil wrote: > This snippet of assembly is used by cpu_errata.c to overwrite parts of KVM hyp > vector. It is never directly executed, so move it from .text to .rodata. > > Signed-off-by: David Brazdil > --- > arch/arm64/kvm/hyp/hyp-entry.S | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/arch/arm64/kvm/hyp/hyp-entry.S b/arch/arm64/kvm/hyp/hyp-entry.S > index 5986e1d78d3f..7e5f386c5c2d 100644 > --- a/arch/arm64/kvm/hyp/hyp-entry.S > +++ b/arch/arm64/kvm/hyp/hyp-entry.S > @@ -364,6 +364,11 @@ SYM_CODE_END(__bp_harden_hyp_vecs) > .popsection > > #ifndef __HYPERVISOR__ > + /* > + * This is not executed directly and is instead copied into the vectors > + * by install_bp_hardening_cb(). > + */ > + .pushsection .rodata > SYM_CODE_START(__smccc_workaround_1_smc) I wonder whether we should keep the SYM_CODE_START() annotation or not. It feels weird to say "code" in a rodata section, and the alignment doesn't matter as we copy it in place, as you noticed. > esb > sub sp, sp, #(8 * 4) > @@ -377,5 +382,6 @@ SYM_CODE_START(__smccc_workaround_1_smc) > 1: .org __smccc_workaround_1_smc + __SMCCC_WORKAROUND_1_SMC_SZ > .org 1b > SYM_CODE_END(__smccc_workaround_1_smc) > + .popsection > #endif /* __HYPERVISOR__ */ > #endif /* CONFIG_KVM_INDIRECT_VECTORS */ Otherwise, looks good. Thanks, M. -- Jazz is not dead. It just smells funny... _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel