From patchwork Wed Jan 26 15:10:58 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12725185 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 757EEC28CF5 for ; Wed, 26 Jan 2022 15:12:49 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S242609AbiAZPMt (ORCPT ); Wed, 26 Jan 2022 10:12:49 -0500 Received: from ams.source.kernel.org ([145.40.68.75]:41410 "EHLO ams.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S242606AbiAZPMs (ORCPT ); Wed, 26 Jan 2022 10:12:48 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id 7FD65B81EA4 for ; Wed, 26 Jan 2022 15:12:47 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id DC7F4C340EC; Wed, 26 Jan 2022 15:12:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643209966; bh=CyYorHNQCHBoqo8xQvMZzI3T4+46kiWpXhSL8tXeuog=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NBJGyYqHXEDMMPBM35xpXoLDbMRV3iLQYMg4PV0e5tgtMEx8xbNZBl8GtBW5MquN7 paUhmkKeR7UWd2s509KXZauZizDUqNXAdmrv13SaHofPz+Z+ysD6Uw7Whcv45Nfevm 6L1joTjGY+iX/GEZmqTss1wqDqwZMoNUXgUVVubYFjcnddvx/hIQT7C2reot4I0JMw mh8b+R1BaRkMkd9MXnejxKyE0bLHF28fb0cJlX9PAiPWYPEATEhKsICqcd9dcWrmL4 98l0NegA/SWmrNQy2OkjAJWQaTMTJPd1ARnd5g7pX/QMecNUymtGaBYEgU1qSO8h87 rC7GA0ZoMAZbg== From: Mark Brown To: Catalin Marinas , Will Deacon , Marc Zyngier , Shuah Khan , Shuah Khan Cc: Alan Hayward , Luis Machado , Salil Akerkar , Basant Kumar Dwivedi , Szabolcs Nagy , James Morse , Alexandru Elisei , Suzuki K Poulose , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Mark Brown Subject: [PATCH v9 18/40] arm64/sme: Disable ZA and streaming mode when handling signals Date: Wed, 26 Jan 2022 15:10:58 +0000 Message-Id: <20220126151120.3811248-19-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220126151120.3811248-1-broonie@kernel.org> References: <20220126151120.3811248-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=991; h=from:subject; bh=CyYorHNQCHBoqo8xQvMZzI3T4+46kiWpXhSL8tXeuog=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBh8WSEGMK5oeSY6nFUOtibYupakncbZg936OSHhw4h 4O/+R66JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYfFkhAAKCRAk1otyXVSH0KamB/ 4pimLKdBRbJEaraXrVBKJqymrEQxdZ5oq/4KXqblXFnvx+vGJORilrgkGRLOvqolv/1hpAeVXtLB08 ok52z/hFl1XAu0jGpKB9HCAz5PrgYPzBTNS6p980JcUxj2ukwqFLAyM1nB5EpkOgsd687CFX8W9GSi //p6dsi28vGQbCKnW74bHAKWfhFGnMzGURAc1L/QfUzf43YamYSarYbxlpMJsLnXgr9N1en2Euhd8O mFlTjYcVXoEerrKMTidrmf8q7uGmWlGE9wKpQHxEZnzAUKw4ziqjf/UQ5/lDnIICEXInAjCyWJZUks VtyzDDRnHdq9JjUXDGdbMW5LZY86Wj X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org The ABI requires that streaming mode and ZA are disabled when invoking signal handlers, do this in setup_return() when we prepare the task state for the signal handler. Signed-off-by: Mark Brown --- arch/arm64/kernel/signal.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c index d8aaf4b6f432..cda04fd73333 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -758,6 +758,13 @@ static void setup_return(struct pt_regs *regs, struct k_sigaction *ka, /* TCO (Tag Check Override) always cleared for signal handlers */ regs->pstate &= ~PSR_TCO_BIT; + /* Signal handlers are invoked with ZA and streaming mode disabled */ + if (system_supports_sme()) { + current->thread.svcr &= ~(SYS_SVCR_EL0_ZA_MASK | + SYS_SVCR_EL0_SM_MASK); + sme_smstop(); + } + if (ka->sa.sa_flags & SA_RESTORER) sigtramp = ka->sa.sa_restorer; else