From patchwork Fri May 15 17:16:03 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Catalin Marinas X-Patchwork-Id: 11552761 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 27C24697 for ; Fri, 15 May 2020 17:22:01 +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 0137920727 for ; Fri, 15 May 2020 17:22:00 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="V4Oa6uMQ" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 0137920727 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=jZr6DDzowFXcomRTH3r1cRd3owDH81tBq2q9Vb/KbEg=; b=V4Oa6uMQTkN29J LTyqRZQXcUWU/pKfR475pQpE8IDapiXUcRqRpzmLZQljivXSRbZCLSlqs7U/l3pfSZIVgP4zI8ZRb r+RdYLcxYTjqpf+XrWS+ZrTjQNUjDvUAe2KqMHTyGK01vTC4B/UqNMhLSqo9HBXPtF/47IFTu3zcF tPfN26UhBW7Ra4MEK2MXZ5G9/NCldEki/Byn/Y8S2wlb8m7KuqVqhI1qmqDNtTKPWBy/5/tc66rjQ GqaeF5eElHp2bYWw+5Ynf5QF4P58PZjJMqwn6T/xoIv1evQDuEX8sXk1JiVa49+V2Qg4J3KF5LOvQ LX3nQYsLaGWst/lnvyuw==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jZe22-0000rE-3N; Fri, 15 May 2020 17:21:58 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1jZdx9-00025U-HV for linux-arm-kernel@lists.infradead.org; Fri, 15 May 2020 17:17:00 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 67ADB1042; Fri, 15 May 2020 10:16:55 -0700 (PDT) Received: from localhost.localdomain (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id D37A73F305; Fri, 15 May 2020 10:16:53 -0700 (PDT) From: Catalin Marinas To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v4 17/26] arm64: mte: Restore the GCR_EL1 register after a suspend Date: Fri, 15 May 2020 18:16:03 +0100 Message-Id: <20200515171612.1020-18-catalin.marinas@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200515171612.1020-1-catalin.marinas@arm.com> References: <20200515171612.1020-1-catalin.marinas@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200515_101655_664495_7B200E2C X-CRM114-Status: UNSURE ( 9.86 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] -0.0 SPF_PASS SPF: sender matches SPF record 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record 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, Szabolcs Nagy , Andrey Konovalov , Kevin Brodsky , Peter Collingbourne , linux-mm@kvack.org, Vincenzo Frascino , Will Deacon , Dave P Martin Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org The CPU resume/suspend routines only take care of the common system registers. Restore GCR_EL1 in addition via the __cpu_suspend_exit() function. Signed-off-by: Catalin Marinas Cc: Will Deacon Reviewed-by: Lorenzo Pieralisi --- Notes: New in v3. arch/arm64/include/asm/mte.h | 4 ++++ arch/arm64/kernel/mte.c | 8 ++++++++ arch/arm64/kernel/suspend.c | 4 ++++ 3 files changed, 16 insertions(+) diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h index c79dbffd30c4..7435f6619bf1 100644 --- a/arch/arm64/include/asm/mte.h +++ b/arch/arm64/include/asm/mte.h @@ -22,6 +22,7 @@ void mte_sync_tags(pte_t *ptep, pte_t pte); void mte_copy_page_tags(void *kto, const void *kfrom); void flush_mte_state(void); void mte_thread_switch(struct task_struct *next); +void mte_suspend_exit(void); long set_mte_ctrl(unsigned long arg); long get_mte_ctrl(void); @@ -42,6 +43,9 @@ static inline void flush_mte_state(void) static inline void mte_thread_switch(struct task_struct *next) { } +static inline void mte_suspend_exit(void) +{ +} static inline long set_mte_ctrl(unsigned long arg) { return 0; diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index 999300e2110e..cda09bc8caf4 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c @@ -116,6 +116,14 @@ void mte_thread_switch(struct task_struct *next) update_gcr_el1_excl(next->thread.gcr_incl); } +void mte_suspend_exit(void) +{ + if (!system_supports_mte()) + return; + + update_gcr_el1_excl(current->thread.gcr_incl); +} + long set_mte_ctrl(unsigned long arg) { u64 tcf0; diff --git a/arch/arm64/kernel/suspend.c b/arch/arm64/kernel/suspend.c index 9405d1b7f4b0..1d405b73d009 100644 --- a/arch/arm64/kernel/suspend.c +++ b/arch/arm64/kernel/suspend.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -74,6 +75,9 @@ void notrace __cpu_suspend_exit(void) */ if (arm64_get_ssbd_state() == ARM64_SSBD_FORCE_DISABLE) arm64_set_ssbd_mitigation(false); + + /* Restore additional MTE-specific configuration */ + mte_suspend_exit(); } /*