From mboxrd@z Thu Jan 1 00:00:00 1970 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id EF027C25B08 for ; Wed, 17 Aug 2022 14:11:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:Cc:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=j8Z0FzeZkj+G3ueV5YfLHwaBbLAWJDcMqMKVe5jqiew=; b=Xn4WIIo6bAx9Hi r/skhx65Sh8QwDu+4gSGvwIkcRO+YC5wQxyQZJlJJqZgUBIjuQX1lMqDxdu6gOGoDWHbZAeIZAtId CKgYeaclTBYzl6TwFRoymxlA+u8gfCllzdygtdi2RGfq55tTNW8gu/IuunhVdsg6h8PtT7Yfkrv7x BcJzBoJtSdVk/xF4d8m/zyYBKVT6ZNXXyMeBYIAKiMFtTxXacRawiU6GoZqnICqM4Cl0CiF23zAj2 KRrid416TGBDFK457wj1B4T2gs3xCR7JLvkixtGr2FlPVNf2w9HeVOV9AJJJ4XzOSKHdXN3Rq36Tn vy8fNYnP++U+4FVlGqOw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oOJk8-002hJf-6f; Wed, 17 Aug 2022 14:10:00 +0000 Received: from ams.source.kernel.org ([145.40.68.75]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oOJk1-002hG4-ED for linux-arm-kernel@lists.infradead.org; Wed, 17 Aug 2022 14:09:57 +0000 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 E97A1B81DB8 for ; Wed, 17 Aug 2022 14:09:51 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C472C433C1; Wed, 17 Aug 2022 14:09:49 +0000 (UTC) Date: Wed, 17 Aug 2022 15:09:46 +0100 From: Catalin Marinas To: Mark Brown Cc: Will Deacon , linux-arm-kernel@lists.infradead.org Subject: Re: [PATCH v2 2/4] arm64/signal: Flush FPSIMD register state when disabling streaming mode Message-ID: References: <20220815132834.229769-1-broonie@kernel.org> <20220815132834.229769-3-broonie@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220815132834.229769-3-broonie@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220817_070953_658353_BB953891 X-CRM114-Status: GOOD ( 13.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, Aug 15, 2022 at 02:28:32PM +0100, Mark Brown wrote: > When handling a signal delivered to a context with streaming mode enabled > we will disable streaming mode for the signal handler, when doing so we > should also flush the saved FPSIMD register state like exiting streaming > mode in the hardware would do so that if that state is reloaded we get the > same behaviour. Without this we will reload whatever the last FPSIMD state > that was saved for the task was. > > Fixes: 40a8e87bb3285 ("arm64/sme: Disable ZA and streaming mode when handling signals") > Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel