From patchwork Tue Jan 25 00:10:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12723040 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 5303CC41535 for ; Tue, 25 Jan 2022 00:30:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S3409086AbiAYAYz (ORCPT ); Mon, 24 Jan 2022 19:24:55 -0500 Received: from dfw.source.kernel.org ([139.178.84.217]:51858 "EHLO dfw.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2374219AbiAYAQc (ORCPT ); Mon, 24 Jan 2022 19:16:32 -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 dfw.source.kernel.org (Postfix) with ESMTPS id 7BC2561544 for ; Tue, 25 Jan 2022 00:16:29 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1ED39C340E7; Tue, 25 Jan 2022 00:16:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643069788; bh=CyYorHNQCHBoqo8xQvMZzI3T4+46kiWpXhSL8tXeuog=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=dR98lk/evzo95/oTdTavZiiy+tUM5d1x2DQdwu0dBZ/jdSmHMVSqvY/jYb+BgZva9 Yr5ya2gJUOPosc93CMHSijafFHEp0v9NkHULmff3z0LRX473yq9mID8pia4nutxFxk e8TCMiv9w954wxIOLF4eDsfUhH1g2fjlxKBeJBAf2AfG82MDUCCRCh5cvA93/tLTYM c2M0ypysct4NTRjdTY0MhXm7jkGXIKQcB0vE+s3IfZQvTfcY+iFykvsu6AKXcoxSmV qBDLvZHeQgPtok0xuQnCPgG57qtbwzB961dKnTjjXEneoQic5qzOPlRBNY/oSkFhJL V54G6xbv7m45A== 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 v8 17/38] arm64/sme: Disable ZA and streaming mode when handling signals Date: Tue, 25 Jan 2022 00:10:53 +0000 Message-Id: <20220125001114.193425-18-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220125001114.193425-1-broonie@kernel.org> References: <20220125001114.193425-1-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/pANAwAKASTWi3JdVIfQAcsmYgBh70AOGMK5oeSY6nFUOtibYupakncbZg936OSHhw4h 4O/+R66JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYe9ADgAKCRAk1otyXVSH0IkWB/ 41nuo+z75dcDfO4+NfLkmOvY6Mt8MdU1fEcMLWAic06ZsyScts/NroUedOCsQ80E/nN5chRCGjEQdK rq9L3XYI47Eqr/4vWM29mP04s+bRdBUHXzPHDe+LHyWMDh7UgVubC+SrAiUfhDD58WsnataTGoQz09 pyZiOcqDFZy0XPCCVdCBl2r7+DiRDF2k0xUkwpBDOWEUOFrztDJ7SZkeUD2Wi0mM7n8u5/yY6p+Aja jaeB7mctWB7b7OLmQ5wgMWodm56LiqOTxYMVQbjMK9QDAeL/WVGjVr13FZ0ni+kW2/1FAjP+uknIBY 54s3+/d1ii0jelQCiDugZ4eLY9T7t9 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