From patchwork Tue May 11 18:23:22 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 12251801 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=-17.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT 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 D836CC433ED for ; Tue, 11 May 2021 18:25:39 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (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 4C088617ED for ; Tue, 11 May 2021 18:25:39 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4C088617ED Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Yhmp6sDVHA83sqK6e/eePZlm36SZ2dPbCpaghuI3C3w=; b=mfaXCzh/UChMvpQKIycBrWtK6 GWx7QQXxh4Dt3cZP2qjMEzWhZgopmzJvGc1CvyH1xzOxEPYY0geGMU6HjRdE9nMQKeVvYOSZmZDO1 yEVd2fZrVD1XItb5Trsgq/mDn9zRRLU6ikUrf9BdhgwrcLdR9GXcNaMJiFzoyqMIY1zR+ZI7gZYYQ 0EWQ7vmXP/3iEP1F788DueamK8GNb0WQCfw+CxD5DtKc2CWn/CApeY4Embk7Pk0iz0MDFOIrUw9sS zGtpkVwfGfjUFm8XpSYovf8i9m6l7h+DAbV5TMF/t7qDGcfpEtHD6VB6p/Ye/H2r19CZH+HvTKQQB qmCDFinkg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lgX2w-0010NS-Mz; Tue, 11 May 2021 18:23:54 +0000 Received: from bombadil.infradead.org ([2607:7c80:54:e::133]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lgX2Z-0010HX-1w for linux-arm-kernel@desiato.infradead.org; Tue, 11 May 2021 18:23:31 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=nj6NBoLqc4CCGzLfLTDxO/2hhyKoIcsd2SX9GMlNtbg=; b=SkMJz5bt6IUbAT/jN/MjtLgkge iqX5cRCu7niEiCwJIqQWuWNI1zuwohD4w+Uee1wy6dyub/jU8GLhdPNRUBsN7MB/OK6ZjZ5h0NVN8 lPI/PKfYaoUDS3HClqHLyPWkxnGxbD54cvW0Y0EmxtkpdTGJlGWN1Fe1wayzJgLKNnw2Pgrg5X002 FWQWib8o+32yLDmSC8fyX9rj9wZNOQp8wOwG8+jhv4oaw2XFHepkW0Oq2uKZXB9H1rssLsoZ0w60F 1uDwe2eZdtoSx9evh6GuosRF56PbndkQg96sZC1FBUlz+S2DsCglLJFCdqWZVntVg2/fhy7HceMuB 6ydBQ9cw==; Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lgX2W-009q8Z-Ct for linux-arm-kernel@lists.infradead.org; Tue, 11 May 2021 18:23:29 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id 2650A617ED; Tue, 11 May 2021 18:23:27 +0000 (UTC) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Cc: Will Deacon , Mark Rutland , Suzuki K Poulose Subject: [PATCH 2/2] arm64: Check if GMID_EL1.BS is the same on all CPUs Date: Tue, 11 May 2021 19:23:22 +0100 Message-Id: <20210511182322.3830-3-catalin.marinas@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210511182322.3830-1-catalin.marinas@arm.com> References: <20210511182322.3830-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210511_112328_492836_90B9115F X-CRM114-Status: GOOD ( 12.59 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The GMID_EL1.BS field determines the number of tags accessed by the LDGM/STGM instructions (EL1 and up), used by the kernel for copying or zeroing page tags. Taint the kernel if GMID_EL1.BS differs between CPUs. Signed-off-by: Catalin Marinas Cc: Will Deacon Cc: Mark Rutland Cc: Suzuki K Poulose Acked-by: Mark Rutland --- arch/arm64/include/asm/cpu.h | 1 + arch/arm64/kernel/cpufeature.c | 17 +++++++++++++++++ arch/arm64/kernel/cpuinfo.c | 1 + 3 files changed, 19 insertions(+) diff --git a/arch/arm64/include/asm/cpu.h b/arch/arm64/include/asm/cpu.h index fe5a8499ddc2..9088e72c7cf6 100644 --- a/arch/arm64/include/asm/cpu.h +++ b/arch/arm64/include/asm/cpu.h @@ -20,6 +20,7 @@ struct cpuinfo_arm64 { u64 reg_dczid; u64 reg_midr; u64 reg_revidr; + u64 reg_gmid; u64 reg_id_aa64dfr0; u64 reg_id_aa64dfr1; diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c index ca66a61bb396..3b9089ca52dc 100644 --- a/arch/arm64/kernel/cpufeature.c +++ b/arch/arm64/kernel/cpufeature.c @@ -401,6 +401,11 @@ static const struct arm64_ftr_bits ftr_dczid[] = { ARM64_FTR_END, }; +static const struct arm64_ftr_bits ftr_gmid[] = { + ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, SYS_GMID_EL1_BS_SHIFT, 4, 0), + ARM64_FTR_END, +}; + static const struct arm64_ftr_bits ftr_id_isar0[] = { ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_DIVIDE_SHIFT, 4, 0), ARM64_FTR_BITS(FTR_HIDDEN, FTR_STRICT, FTR_LOWER_SAFE, ID_ISAR0_DEBUG_SHIFT, 4, 0), @@ -618,6 +623,9 @@ static const struct __ftr_reg_entry { /* Op1 = 0, CRn = 1, CRm = 2 */ ARM64_FTR_REG(SYS_ZCR_EL1, ftr_zcr), + /* Op1 = 1, CRn = 0, CRm = 0 */ + ARM64_FTR_REG(SYS_GMID_EL1, ftr_gmid), + /* Op1 = 3, CRn = 0, CRm = 0 */ { SYS_CTR_EL0, &arm64_ftr_reg_ctrel0 }, ARM64_FTR_REG(SYS_DCZID_EL0, ftr_dczid), @@ -872,6 +880,7 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info) init_cpu_ftr_reg(SYS_CTR_EL0, info->reg_ctr); init_cpu_ftr_reg(SYS_DCZID_EL0, info->reg_dczid); init_cpu_ftr_reg(SYS_CNTFRQ_EL0, info->reg_cntfrq); + init_cpu_ftr_reg(SYS_GMID_EL1, info->reg_gmid); init_cpu_ftr_reg(SYS_ID_AA64DFR0_EL1, info->reg_id_aa64dfr0); init_cpu_ftr_reg(SYS_ID_AA64DFR1_EL1, info->reg_id_aa64dfr1); init_cpu_ftr_reg(SYS_ID_AA64ISAR0_EL1, info->reg_id_aa64isar0); @@ -1082,6 +1091,14 @@ void update_cpu_features(int cpu, taint |= check_update_ftr_reg(SYS_DCZID_EL0, cpu, info->reg_dczid, boot->reg_dczid); + /* + * The kernel uses the LDGM/STGM instructions and the number of tags + * they read/write depends on the GMID_EL1.BS field. Check that the + * value is the same on all CPUs. + */ + taint |= check_update_ftr_reg(SYS_GMID_EL1, cpu, + info->reg_gmid, boot->reg_gmid); + /* If different, timekeeping will be broken (especially with KVM) */ taint |= check_update_ftr_reg(SYS_CNTFRQ_EL0, cpu, info->reg_cntfrq, boot->reg_cntfrq); diff --git a/arch/arm64/kernel/cpuinfo.c b/arch/arm64/kernel/cpuinfo.c index 4bea701117d4..cd9f2d51285b 100644 --- a/arch/arm64/kernel/cpuinfo.c +++ b/arch/arm64/kernel/cpuinfo.c @@ -359,6 +359,7 @@ static void __cpuinfo_store_cpu(struct cpuinfo_arm64 *info) info->reg_dczid = read_cpuid(DCZID_EL0); info->reg_midr = read_cpuid_id(); info->reg_revidr = read_cpuid(REVIDR_EL1); + info->reg_gmid = read_cpuid(GMID_EL1); info->reg_id_aa64dfr0 = read_cpuid(ID_AA64DFR0_EL1); info->reg_id_aa64dfr1 = read_cpuid(ID_AA64DFR1_EL1);