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 X-Spam-Level: X-Spam-Status: No, score=-14.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id D33E5C433DB for ; Mon, 22 Mar 2021 13:23:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 91C3F61920 for ; Mon, 22 Mar 2021 13:23:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231552AbhCVNVg (ORCPT ); Mon, 22 Mar 2021 09:21:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:38808 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232167AbhCVNUJ (ORCPT ); Mon, 22 Mar 2021 09:20:09 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id B78C161606; Mon, 22 Mar 2021 13:20:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616419209; bh=paoioZHt7SggcDIVeK8nqBctwIc6qD7MD6NrpBx+xnc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KOfdzn6/i5usxMfDTxX/pV0wBCU+J0cbq+hgrqVoiq9yDLNZKApJyu7KIhfCgY30D mo+0Hnawl+Z+vGyXewgutdV4ohCJRSrx10FsL+bK+UlpEVZva4W1ft5xNW0DPgwVZh qDkC6kDe9K7Ex57FLuVLWVUW3Z+JcXOiWrHxEn6pedbBmazfvCfNEjfAXeM0C9nAuw M0X8q4BKUtQ75Ra19IJ24EPaBQgEUVH0skOEs78b5p+J8V/Tnah/+GWeJMBiv+M43J iworjIZFejBa9ca/S/Rmkxwbl/DFtUJIQfHEBxgTKUtt9nhibhOoPX2zkOZGsSj7Nx XdMrT+o5tKq8g== From: Will Deacon To: Shuah Khan , Catalin Marinas , Andre Przywara Cc: kernel-team@android.com, Will Deacon , linux-arm-kernel@lists.infradead.org, Mark Brown , linux-kselftest@vger.kernel.org, Dave Martin Subject: Re: [PATCH] kselftest/arm64: sve: Do not use non-canonical FFR register value Date: Mon, 22 Mar 2021 13:19:55 +0000 Message-Id: <161641739736.3901488.4203092835901236915.b4-ty@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210319120128.29452-1-andre.przywara@arm.com> References: <20210319120128.29452-1-andre.przywara@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org On Fri, 19 Mar 2021 12:01:28 +0000, Andre Przywara wrote: > The "First Fault Register" (FFR) is an SVE register that mimics a > predicate register, but clears bits when a load or store fails to handle > an element of a vector. The supposed usage scenario is to initialise > this register (using SETFFR), then *read* it later on to learn about > elements that failed to load or store. Explicit writes to this register > using the WRFFR instruction are only supposed to *restore* values > previously read from the register (for context-switching only). > As the manual describes, this register holds only certain values, it: > "... contains a monotonic predicate value, in which starting from bit 0 > there are zero or more 1 bits, followed only by 0 bits in any remaining > bit positions." > Any other value is UNPREDICTABLE and is not supposed to be "restored" > into the register. > > [...] Applied to arm64 (for-next/fixes), thanks! [1/1] kselftest/arm64: sve: Do not use non-canonical FFR register value https://git.kernel.org/arm64/c/7011d72588d1 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev 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 X-Spam-Level: X-Spam-Status: No, score=-12.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EBA29C433C1 for ; Mon, 22 Mar 2021 13:23:04 +0000 (UTC) Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 7CFFB61974 for ; Mon, 22 Mar 2021 13:23:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 7CFFB61974 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=+k5Sbw0miq2DZs/UVpMvhxMJSfId77hgwjWNiTivteE=; b=OJtGYwwFeXZYLyskPHMvkCVDY F/GT7PqEFc+I9OJ+HW6N+swExT5n0U5bTNnMHM7BWRo8HinJ5h/6F27jbjIIHS817ImAz7oPq+sgE FDgD3pUXg8GvdU2PQokZCNQl2TvrDV1Am/JWoMcc9/MtkG2aL0vTYx2RKXhcPcOMvIkoJnuI70ivm jYTIelzl99kQxMivw7y9aen/nzA6i+INWA/xEG7TmZDBnAYjezZjRiyRH/on0XrJH6ubC/Bj8hstE wevsSyTiGJHXgnLj2NSeDfrvm4sNJDars9QOJxAD6/o5nx9Y6QPdohmQh9tspYZB2uUiTUSYX97BI EiLCCN8mw==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lOKUW-00BgkP-Am; Mon, 22 Mar 2021 13:21:08 +0000 Received: from casper.infradead.org ([90.155.50.34]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lOKUP-00BgjN-5R for linux-arm-kernel@desiato.infradead.org; Mon, 22 Mar 2021 13:21:01 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:Content-Type: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-ID:Content-Description; bh=YJu8B8AeozcltghBBqoa4oLTZQJidIPiUr7tMiHYeDE=; b=DS0tf3QfBGpxG01GTHfYOy6W3O /qa8OXZoLSkVriPRf5JDDQXK9aJY8KrgD/XNgZ7Jiya6QgDqN5XYzpyGdNV0ppATsJaS1+k0q40km 8HF+YLDfz57V6qIxYAtTgNdv2X4Uz4eOQsQ7KuyuBg2WevsaCJuWxIHjYtAF57mUKEpy1eaABDQDC 43i6VITQ5q+xTk2wL4NdD9DHmfXZkr7Yxk9wZ0C6W12cqmSCU+iW27VfHW0C9XDtKjqcAa1o7uEfq EPB4uSoepG959gXJJ3Xcko2QQevyqcQ/f93fV0+nrSC7Of+0bglrIxXWx/1bgBQ6fNYnrOzEEbvKi 7BwO6piA==; Received: from mail.kernel.org ([198.145.29.99]) by casper.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lOKTw-008Z53-CD for linux-arm-kernel@lists.infradead.org; Mon, 22 Mar 2021 13:20:53 +0000 Received: by mail.kernel.org (Postfix) with ESMTPSA id B78C161606; Mon, 22 Mar 2021 13:20:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616419209; bh=paoioZHt7SggcDIVeK8nqBctwIc6qD7MD6NrpBx+xnc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=KOfdzn6/i5usxMfDTxX/pV0wBCU+J0cbq+hgrqVoiq9yDLNZKApJyu7KIhfCgY30D mo+0Hnawl+Z+vGyXewgutdV4ohCJRSrx10FsL+bK+UlpEVZva4W1ft5xNW0DPgwVZh qDkC6kDe9K7Ex57FLuVLWVUW3Z+JcXOiWrHxEn6pedbBmazfvCfNEjfAXeM0C9nAuw M0X8q4BKUtQ75Ra19IJ24EPaBQgEUVH0skOEs78b5p+J8V/Tnah/+GWeJMBiv+M43J iworjIZFejBa9ca/S/Rmkxwbl/DFtUJIQfHEBxgTKUtt9nhibhOoPX2zkOZGsSj7Nx XdMrT+o5tKq8g== From: Will Deacon To: Shuah Khan , Catalin Marinas , Andre Przywara Cc: kernel-team@android.com, Will Deacon , linux-arm-kernel@lists.infradead.org, Mark Brown , linux-kselftest@vger.kernel.org, Dave Martin Subject: Re: [PATCH] kselftest/arm64: sve: Do not use non-canonical FFR register value Date: Mon, 22 Mar 2021 13:19:55 +0000 Message-Id: <161641739736.3901488.4203092835901236915.b4-ty@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20210319120128.29452-1-andre.przywara@arm.com> References: <20210319120128.29452-1-andre.przywara@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210322_132041_834069_50E9EC63 X-CRM114-Status: UNSURE ( 9.83 ) X-CRM114-Notice: Please train this message. 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 Fri, 19 Mar 2021 12:01:28 +0000, Andre Przywara wrote: > The "First Fault Register" (FFR) is an SVE register that mimics a > predicate register, but clears bits when a load or store fails to handle > an element of a vector. The supposed usage scenario is to initialise > this register (using SETFFR), then *read* it later on to learn about > elements that failed to load or store. Explicit writes to this register > using the WRFFR instruction are only supposed to *restore* values > previously read from the register (for context-switching only). > As the manual describes, this register holds only certain values, it: > "... contains a monotonic predicate value, in which starting from bit 0 > there are zero or more 1 bits, followed only by 0 bits in any remaining > bit positions." > Any other value is UNPREDICTABLE and is not supposed to be "restored" > into the register. > > [...] Applied to arm64 (for-next/fixes), thanks! [1/1] kselftest/arm64: sve: Do not use non-canonical FFR register value https://git.kernel.org/arm64/c/7011d72588d1 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel