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 AFEF1C433EF for ; Mon, 21 Feb 2022 18:12:48 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 11A2A4B231; Mon, 21 Feb 2022 13:12:48 -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 FxiX5ZaVzk4b; Mon, 21 Feb 2022 13:12:46 -0500 (EST) Received: from mm01.cs.columbia.edu (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id 9183A4B22C; Mon, 21 Feb 2022 13:12:46 -0500 (EST) Received: from localhost (localhost [127.0.0.1]) by mm01.cs.columbia.edu (Postfix) with ESMTP id C25B14B225 for ; Mon, 21 Feb 2022 13:12:45 -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 6YHEikiUhcdZ for ; Mon, 21 Feb 2022 13:12:44 -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 9BA9B4B21A for ; Mon, 21 Feb 2022 13:12:44 -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 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 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> 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 03:20:44PM +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 _______________________________________________ kvmarm mailing list kvmarm@lists.cs.columbia.edu https://lists.cs.columbia.edu/mailman/listinfo/kvmarm