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=-9.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 404DFC83004 for ; Tue, 28 Apr 2020 18:55:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1D932206A1 for ; Tue, 28 Apr 2020 18:55:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588100146; bh=2jMiSALDv50QzCUlTeNHittWa+cIG7wLty3qu/h8BX4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=ghzepMke7iUArglZeJENvnlejBbmvbCKZxSRNNiBQy5tlZmShNYRBX4a/kPAo4gW+ b4g6+V87vQ6jsB6vpLZWSIBee29JnDzkKU9oRdde98H/vI8zxtRZKkEC525F6d73lW osVjEcPSr1Rwy+3f5QW+SStDm5+IO0TI49M6F7uI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729834AbgD1Szm (ORCPT ); Tue, 28 Apr 2020 14:55:42 -0400 Received: from mail.kernel.org ([198.145.29.99]:48370 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729290AbgD1ScQ (ORCPT ); Tue, 28 Apr 2020 14:32:16 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id E5D442076A; Tue, 28 Apr 2020 18:32:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1588098736; bh=2jMiSALDv50QzCUlTeNHittWa+cIG7wLty3qu/h8BX4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AFMfvD2q996067L9ESuuVdLyJzg9DaU+Rg2m0SRyaq3/Bc3f+lM6M3EbMcO6fJdnA lT0Xb19U7hCxzZtUDi7rvszgFDaddLB+wHY77IVAu6+Miey/JNp52L6euQPGJtd4Cn B5fGshjGBN7PDMndSn7p4yHM/CPHaAMN9K5SJLXY= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, James Morse , Catalin Marinas , Sasha Levin Subject: [PATCH 5.4 006/168] arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space Date: Tue, 28 Apr 2020 20:23:00 +0200 Message-Id: <20200428182232.484512497@linuxfoundation.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20200428182231.704304409@linuxfoundation.org> References: <20200428182231.704304409@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: James Morse [ Upstream commit 222fc0c8503d98cec3cb2bac2780cdd21a6e31c0 ] Compat user-space is unable to perform ICIMVAU instructions from user-space. Instead it uses a compat-syscall. Add the workaround for Neoverse-N1 #1542419 to this code path. Signed-off-by: James Morse Signed-off-by: Catalin Marinas Signed-off-by: James Morse Signed-off-by: Sasha Levin --- arch/arm64/kernel/sys_compat.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/arch/arm64/kernel/sys_compat.c b/arch/arm64/kernel/sys_compat.c index f1cb649594271..c9fb02927d3e5 100644 --- a/arch/arm64/kernel/sys_compat.c +++ b/arch/arm64/kernel/sys_compat.c @@ -8,6 +8,7 @@ */ #include +#include #include #include #include @@ -17,6 +18,7 @@ #include #include +#include #include static long @@ -30,6 +32,15 @@ __do_compat_cache_op(unsigned long start, unsigned long end) if (fatal_signal_pending(current)) return 0; + if (cpus_have_const_cap(ARM64_WORKAROUND_1542419)) { + /* + * The workaround requires an inner-shareable tlbi. + * We pick the reserved-ASID to minimise the impact. + */ + __tlbi(aside1is, 0); + dsb(ish); + } + ret = __flush_cache_user_range(start, start + chunk); if (ret) return ret; -- 2.20.1