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 mm01.cs.columbia.edu (mm01.cs.columbia.edu [128.59.11.253]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B31AC433F5 for ; Wed, 23 Feb 2022 15:28:50 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id E0EFC4C5E9; Wed, 23 Feb 2022 10:28:49 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 4ad-7HwO0hwT; Wed, 23 Feb 2022 10:28:48 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 741324C5E7; Wed, 23 Feb 2022 10:28:48 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 1D57C4C5E5 for ; Wed, 23 Feb 2022 10:28:47 -0500 (EST) X-Virus-Scanned: at lists.cs.columbia.edu Received: from mm01.cs.columbia.edu ([127.0.0.1]) by localhost (mm01.cs.columbia.edu [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id wx1474A8vWFB for ; Wed, 23 Feb 2022 10:28:45 -0500 (EST) Received: from ams.source.kernel.org (ams.source.kernel.org [145.40.68.75]) by mm01.cs.columbia.edu (Postfix) with ESMTPS id B43144C5E4 for ; Wed, 23 Feb 2022 10:28:45 -0500 (EST) 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 DCD77B82036; Wed, 23 Feb 2022 15:28:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 8B21BC340E7; Wed, 23 Feb 2022 15:28:39 +0000 (UTC) Date: Wed, 23 Feb 2022 15:28:35 +0000 From: Catalin Marinas To: Mark Brown Subject: Re: [PATCH v11 24/40] arm64/sme: Disable streaming mode and ZA when flushing CPU state Message-ID: References: <20220207152109.197566-1-broonie@kernel.org> <20220207152109.197566-25-broonie@kernel.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20220207152109.197566-25-broonie@kernel.org> Cc: Basant Kumar Dwivedi , Will Deacon , Luis Machado , Szabolcs Nagy , Marc Zyngier , Shuah Khan , linux-arm-kernel@lists.infradead.org, linux-kselftest@vger.kernel.org, Alan Hayward , Shuah Khan , kvmarm@lists.cs.columbia.edu, Salil Akerkar X-BeenThere: kvmarm@lists.cs.columbia.edu X-Mailman-Version: 2.1.14 Precedence: list List-Id: Where KVM/ARM decisions are made List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: kvmarm-bounces@lists.cs.columbia.edu Sender: kvmarm-bounces@lists.cs.columbia.edu On Mon, Feb 07, 2022 at 03:20:53PM +0000, Mark Brown wrote: > Both streaming mode and ZA may increase power consumption when they are > enabled and streaming mode makes many FPSIMD and SVE instructions undefined > which will cause problems for any kernel mode floating point so disable > both when we flush the CPU state. This covers both kernel_neon_begin() and > idle and after flushing the state a reload is always required anyway. > > Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm