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 5BD97C433EF for ; Mon, 21 Feb 2022 18:13:54 +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=RdV+BqhEp3D9KeqzI6fD2Gxlpnzd/TkGIgBVJ/fTWdU=; b=i/JKox5irpfC4i suDorsGG8hnB4r4HwMZQvKYN7oHXVEGFZ2LayxMQJmr/oCXu6hRSOC7veJqIFkbQEjXE+nNcuLVOu sugFUf5vZOgt01XdFv8Ty3UN5fi5PYRk5jaFkkEe+wqiWNtvieqbxbC1GOri6OcQPOfRv9TWLKGgi pJSMFFCcBI3F504XZK2YlqvC8TdsoUQyrEDgdz9WZA0dh9grC8ll5rYwSJonHpf1F9x2XIU4rFg7P clJ0gwELoHU4QY9lFdmQ/nYc4w9cEG4cYCb36fxgoOJElRlLieKq44Nax4rlTKFVOKxWPqT1PKe/1 9UdZrWgpACOG9mGi7Stw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMDB2-006uxs-Cc; Mon, 21 Feb 2022 18:12:48 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMDAy-006uwv-ST for linux-arm-kernel@lists.infradead.org; Mon, 21 Feb 2022 18:12:46 +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 5C9AEB816B9; Mon, 21 Feb 2022 18:12:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 53059C340E9; Mon, 21 Feb 2022 18:12:39 +0000 (UTC) Date: Mon, 21 Feb 2022 18:12:36 +0000 From: Catalin Marinas To: Mark Brown Cc: Will Deacon , Marc Zyngier , Shuah Khan , Shuah Khan , 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 Subject: Re: [PATCH v11 15/40] arm64/sme: Implement SVCR context switching Message-ID: References: <20220207152109.197566-1-broonie@kernel.org> <20220207152109.197566-16-broonie@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220207152109.197566-16-broonie@kernel.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220221_101245_088188_998F2469 X-CRM114-Status: GOOD ( 10.93 ) 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, Feb 07, 2022 at 03:20:44PM +0000, Mark Brown wrote: > In SME the use of both streaming SVE mode and ZA are tracked through > PSTATE.SM and PSTATE.ZA, visible through the system register SVCR. In > order to context switch the floating point state for SME we need to > context switch the contents of this register as part of context > switching the floating point state. > > Since changing the vector length exits streaming SVE mode and disables > ZA we also make sure we update SVCR appropriately when setting vector > length, and similarly ensure that new threads have streaming SVE mode > and ZA disabled. > > 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