From patchwork Fri Apr 8 11:43:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 12806565 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 5D2F7C433EF for ; Fri, 8 Apr 2022 11:56:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235295AbiDHL6c (ORCPT ); Fri, 8 Apr 2022 07:58:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41590 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230191AbiDHL62 (ORCPT ); Fri, 8 Apr 2022 07:58:28 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A7D927DE39 for ; Fri, 8 Apr 2022 04:56:24 -0700 (PDT) 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 44A5A62068 for ; Fri, 8 Apr 2022 11:56:24 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 15DF8C385A3; Fri, 8 Apr 2022 11:56:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1649418983; bh=IgQmCXJBE2ycdQoQEp6rpnOwcUiocLTkhM4XALt/TLE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s9yXSip+T+rwF0geLqmnSBEhw+LCiazFF+dgKT08KCU41j19JN+45qBbnIFs1JAHK JOoOYYZTXw8aswy0aV3Ez63JwNojzv7AS9rOg7rOrCU1Ge/JBrulEgnE+q5CK/uEsK 9Llr66GXzCQXWcBNqjrhF+lDmlUbrjbT+Ro3DClIz/QjyHTGqJ+XstxVJq3TvQXm6n THESjugbcj6uap7c7BD45fye3nijBwlZo+yf3amgzaGWEE1BRAFGNxLTQrCuD07QWs 1KjFM8OF8kRiNcNC8OS+rTtVgKq/XcPrrJYNj4UEFOORVUhf+tJ0cTkiqk1LK4fpd2 rLT3C8D/2SUMw== 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 , Luca Salabrino , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, kvmarm@lists.cs.columbia.edu, Mark Brown Subject: [PATCH v13 17/39] arm64/sme: Disable ZA and streaming mode when handling signals Date: Fri, 8 Apr 2022 12:43:06 +0100 Message-Id: <20220408114328.1401034-18-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220408114328.1401034-1-broonie@kernel.org> References: <20220408114328.1401034-1-broonie@kernel.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1047; h=from:subject; bh=IgQmCXJBE2ycdQoQEp6rpnOwcUiocLTkhM4XALt/TLE=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBiUB/MNGzbGwQFros5j+TYXHHtF3i8QyvzP5YLP2js TRShsaKJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYlAfzAAKCRAk1otyXVSH0DR/CA CF/lS7py2hHrn3w+TGcIG2waMCPpXXtaw5A3PWm8shZgXJKLmDDspNsvxvmRmIYQzp0iAFDQaLlz1a NBhO9Q9rUd32XfGSa2o12gt0my8bLZt3MYuMZAKm1EhB7wy6+NVBvhaM1grXU4nw0ZQh28AgnZ4kSa hY5jEU7FPK69LoO5QyYOj8B0LxcDNWuG2GHeetXAZxR3bRqzL++R4FuotgZRRYooE2ipmjHQtfuYR7 2rKivu72y3+8k19kakrat3KnSUM7lKE0MrL3xVRFbFjYd8fBxmHHWD9JvikmQ7bRjn+wDLNkObSek3 Uen/EUIpk03hZAO5VwuJGFotoPfZC7 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 4a4122ef6f39..42efa464e46e 100644 --- a/arch/arm64/kernel/signal.c +++ b/arch/arm64/kernel/signal.c @@ -759,6 +759,13 @@ 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