From patchwork Mon Feb 7 15:20:48 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 540653 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 11D96C433F5 for ; Mon, 7 Feb 2022 15:36:11 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232172AbiBGPfL (ORCPT ); Mon, 7 Feb 2022 10:35:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:44794 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1354118AbiBGPY0 (ORCPT ); Mon, 7 Feb 2022 10:24:26 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 08995C0401C9 for ; Mon, 7 Feb 2022 07:24:26 -0800 (PST) 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 BAB69B815B0 for ; Mon, 7 Feb 2022 15:24:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 22F28C340F0; Mon, 7 Feb 2022 15:24:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1644247463; bh=CyYorHNQCHBoqo8xQvMZzI3T4+46kiWpXhSL8tXeuog=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cvLfVWvDfmYSuyjXYex1xBQ9gPyeht5ydOaTKISojTjjKGHIG9295GdPG82prp482 9jqBoMxoubjef/He2tMmwoB7IXLZTRgBLeJcdJf/pxND91R1Pnr55aOBVKUToJeiij Zep6I5WuQx+f5t7ktJB4PuysR5qGvxLT7H7l9LiKrPbRoYAfuuWXHf8NIR1TjeFUXe 3LPAoB7EEaZxKaG0xaIfPW2I94lXsWvlJat6aDW1KAri9qLChHf2dH42t1xMpdTN5i du4rwWlt6CdsB2JMdnMgdhC+C7GNbEVZ+LYZoh6SkBZTzBRbHerHmM9qbWFJHcXxwy a55OHGBDrFhyA== 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 v11 19/40] arm64/sme: Disable ZA and streaming mode when handling signals Date: Mon, 7 Feb 2022 15:20:48 +0000 Message-Id: <20220207152109.197566-20-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220207152109.197566-1-broonie@kernel.org> References: <20220207152109.197566-1-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/pANAwAKASTWi3JdVIfQAcsmYgBiATjTGMK5oeSY6nFUOtibYupakncbZg936OSHhw4h 4O/+R66JATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYgE40wAKCRAk1otyXVSH0LxCB/ 454egnpD5PCrECVP5HSHQwc34prahK5O2UeOwYA8GKdzCWm2CQUxKv/NwgfNrghmSTESgeQcb78Nt1 Iugdh2d/83YioKoWfNCnIUQQuH4Nj0DngdM8SC9Sf7CXng/Q94n2Qv0+44OgPPAO4VoT4wiztIVfvf CNA/QwZt8h4JGo22d3V8V+KPLvJ/lbFKmHQRwNrhw3BBokC4CclEnhsUlr+0AxBsIlZAGIgakJupCO 2dlQMxBu7dF8kvjLWXiQ9JaEObM/ppG34Ecppd+VYT54p03wKwaUEed6Qsh9FnBkGSB9vrdcIKNX51 TIKRbx9TMvAYBh1gZ2sZFJFS81obBO 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 Reviewed-by: Catalin Marinas --- 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