From mboxrd@z Thu Jan 1 00:00:00 1970 From: Catalin Marinas Subject: [PATCH v7 20/29] arm64: mte: Restore the GCR_EL1 register after a suspend Date: Wed, 15 Jul 2020 18:08:35 +0100 Message-ID: <20200715170844.30064-21-catalin.marinas@arm.com> References: <20200715170844.30064-1-catalin.marinas@arm.com> Mime-Version: 1.0 Content-Transfer-Encoding: 8bit Return-path: Received: from mail.kernel.org ([198.145.29.99]:37748 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726777AbgGORJg (ORCPT ); Wed, 15 Jul 2020 13:09:36 -0400 In-Reply-To: <20200715170844.30064-1-catalin.marinas@arm.com> Sender: linux-arch-owner@vger.kernel.org List-ID: To: linux-arm-kernel@lists.infradead.org Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, Will Deacon , Dave P Martin , Vincenzo Frascino , Szabolcs Nagy , Kevin Brodsky , Andrey Konovalov , Peter Collingbourne , Andrew Morton 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 df2efbc9f8f1..c93047eff9fe 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 07798b8d5039..09cf76fc1090 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_user_incl); } +void mte_suspend_exit(void) +{ + if (!system_supports_mte()) + return; + + update_gcr_el1_excl(current->thread.gcr_user_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 c1dee9066ff9..62c239cd60c2 100644 --- a/arch/arm64/kernel/suspend.c +++ b/arch/arm64/kernel/suspend.c @@ -10,6 +10,7 @@ #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(); } /*