From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B1BBB606A31A for ; Mon, 26 Oct 2026 08:23:21 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=waH5aqIh; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Y+Iyn/0R DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-ID:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Unsubscribe-Post: List-Owner; bh=w4N8ZW/s1BKVrlyy1gY9Ahq28l6tlIiYccC8/EYeZPM=; b=waH5aqIhY4F1F0 VsS/1lmQVoNdYMf0nz34MwmziDKBOhbW5RKQuYy1dezF9xCANZY7ca6tuF9+VZeH3i4MhXVrzznFY SF3jSKJyTsOYY2nxV1BpWXerIvFZSai0CARcqz0V/UEaoXeY6MD0XG7+baM4xc2fXROS71huQF05x nDeZuNnT5GL11s/2Tvy7c+FQS1s4fM6L/fp06WWX+EKW4VPZtcc4fLftyYiGdEGsg6m/DayFvfDv6 al7V9Isn8Z/wkz91/oOQZe12qpTy9Fs+5oV5KD/ENLY2Bs5qrOeVwvdk3fxIB+w2uQyI0ykBqhikT odimc2L5UajFCoMhUw/A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLFz7-00000001wWE-3KSS; Mon, 26 Oct 2026 08:23:13 +0000 Received: from tor.source.kernel.org ([172.105.4.254]) by bombadil.infradead.org with esmtps (Exim 4.100.1 #2 (Red Hat Linux)) id 1xLFz5-00000001wVe-46KJ for linux-arm-kernel@lists.infradead.org; Mon, 26 Oct 2026 08:23:12 +0000 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by tor.source.kernel.org (Postfix) with ESMTP id 2D56D601F9; Mon, 26 Oct 2026 08:23:11 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D595D1F01828; Mon, 26 Oct 2026 08:23:10 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793002990; bh=w4N8ZW/s1BKVrlyy1gY9Ahq28l6tlIiYccC8/EYeZPM=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=Y+Iyn/0R5Uo0vF0saj3WkwYUlUNM5WYbCbg2LdNLgfQjUqM+OOmRn1FLSf1D2ztOR ZM+HamV97nKXFsgMQNTb6XXOcHFUFvqBEE756eMunDFyIr58Aw4m/TA5/QdqWBJTPT UkRAtK62hKrJ4KTVTD5w5NNCK1dGj8Cppca9ttYZc6jPql3IcwCcJbJY3NljRWxPsx 3o721dZQdUW38S3s5g/Pwnw3WZpT16ELLtQ3e1MBMhO+r8ZNZuyCnXvSiKWnssIuUk 9hGfr9mpYqcTfgPIerFYouCbshmO5wWzD6D3vFBqE8+vRIMG9hLNioiOCVsgx9ltGT yvdHpWt+x3ZZA== Received: from sofa.misterjones.org ([185.219.108.64] helo=valley-girl.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.98.2) (envelope-from ) id 1xLFz3-00000007A40-0Md2; Mon, 26 Oct 2026 08:23:09 +0000 From: Marc Zyngier To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: Steffen Eiden , Joey Gouly , Suzuki K Poulose , Oliver Upton , Zenghui Yu , Fuad Tabba , Catalin Marinas , Will Deacon , Mark Rutland Subject: [PATCH 1/2] arm64: Add return value to mte_disable_tco_entry() Date: Mon, 26 Oct 2026 08:23:04 +0000 Message-ID: <20261026082305.2515705-2-maz@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261026082305.2515705-1-maz@kernel.org> References: <20261026082305.2515705-1-maz@kernel.org> X-Archived-By: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, seiden@linux.ibm.com, joey.gouly@arm.com, suzuki.poulose@arm.com, oupton@kernel.org, yuzenghui@huawei.com, fuad.tabba@linux.dev, catalin.marinas@arm.com, will@kernel.org, mark.rutland@arm.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" X-Spam-Status: No, score=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=4.0.1 X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-26) on aws-us-west-2-korg-listserv-alma10-1 In order to provide adequate levels of synchronisation when clearing TCO, update mte_disable_tco_entry() to indicate whether it has actually done something. Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/mte.h | 10 +++++++--- 1 file changed, 7 insertions(+), 3 deletions(-) diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h index 7f7b97e099968..411e5a6f6d94c 100644 --- a/arch/arm64/include/asm/mte.h +++ b/arch/arm64/include/asm/mte.h @@ -224,10 +224,10 @@ static inline bool folio_try_hugetlb_mte_tagging(struct folio *folio) } #endif -static inline void mte_disable_tco_entry(struct task_struct *task) +static inline bool mte_disable_tco_entry(struct task_struct *task) { if (!system_supports_mte()) - return; + return false; /* * Re-enable tag checking (TCO set on exception entry). This is only @@ -240,8 +240,12 @@ static inline void mte_disable_tco_entry(struct task_struct *task) * expensive. */ if (kasan_hw_tags_enabled() || - (task->thread.sctlr_user & (1UL << SCTLR_EL1_TCF0_SHIFT))) + (task->thread.sctlr_user & (1UL << SCTLR_EL1_TCF0_SHIFT))) { asm volatile(SET_PSTATE_TCO(0)); + return true; + } + + return false; } #ifdef CONFIG_KASAN_HW_TAGS -- 2.47.3