From patchwork Tue Apr 19 11:22:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 564619 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 C422EC433FE for ; Tue, 19 Apr 2022 11:24:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240017AbiDSL1W (ORCPT ); Tue, 19 Apr 2022 07:27:22 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59180 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235423AbiDSL1W (ORCPT ); Tue, 19 Apr 2022 07:27:22 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E4545F98 for ; Tue, 19 Apr 2022 04:24:40 -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 ams.source.kernel.org (Postfix) with ESMTPS id E8F8AB81851 for ; Tue, 19 Apr 2022 11:24:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 285FEC385A8; Tue, 19 Apr 2022 11:24:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1650367477; bh=IgQmCXJBE2ycdQoQEp6rpnOwcUiocLTkhM4XALt/TLE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NipyCTm6aOhDxlULTGm5DiNJYlv/O9yw2ymObb6K/6ie9NqGDhIXw7vrvW4zTXu7r BUMjSUcefjxG4W+pxQ30zVfcGhuE8F9GdaQyWBgCzVw6ffO/sKz/WFaWgtvRPQNhrd lGHoocjf6ZfmmMNazL0j5B+ZQ0FpIw5weFg6C/AXr6YlSPJR71U0rbrSF6o4+S0uHc 1TznWNQ8kxWUF3GPMMqh83utEkjXDOUZmm3rfsj7am1uUsLnL7UYF8zb7T6QibJnHN iOAMyqhH80u05m2KTIEMy0qUKEWa0iN1ag389TBeLTHlrza2dRiCFI7Cp1yhDw8UBB dWvmdSUicRQ0A== 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 v14 17/39] arm64/sme: Disable ZA and streaming mode when handling signals Date: Tue, 19 Apr 2022 12:22:25 +0100 Message-Id: <20220419112247.711548-18-broonie@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220419112247.711548-1-broonie@kernel.org> References: <20220419112247.711548-1-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/pANAwAKASTWi3JdVIfQAcsmYgBiXpt1NGzbGwQFros5j+TYXHHtF3i8QyvzP5YLP2js TRShsaKJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCYl6bdQAKCRAk1otyXVSH0Fx5CA CFOdMEDMidXxyCWrnDbnkd6gNtPvdnJIP8qJ6nHTq1zLgcbCU0RrXA8u2X/g2a3KYcUtwFdqQGFgni JV4jTDo5tUFcNH1f6GUVw6C5VGEfkkMGBS4cEohT6J9AGcz+8xheLP0ap+/BB8HRzYzlkIK8lkO/A5 D/+OpwHkhPqiOmVqe9lBYNJ4CjkaPwLV6vg24n1Pj6EfwDcsSqYHCoQ3bzfCrTsXvYo34ra+704cfH cFntoDFR06VnVe5qxg5IaeuI41DQqcy4Y8SZJsuQ+sMbkeiazCw25L/YSN0iTStv+meabk2vVBk/YF WS89rMfbrz7TsXz3ONjCYYLkZdtSw7 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