From patchwork Thu Oct 17 17:43:00 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: James Morse X-Patchwork-Id: 11196489 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 8D14718A6 for ; Thu, 17 Oct 2019 17:43:44 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 6794E20820 for ; Thu, 17 Oct 2019 17:43:44 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="sNMcN5xU" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6794E20820 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=4z4CXB3KJTMjOkUZEOBiOgh2XRsfd3ljJ240H4sRurs=; b=sNMcN5xUVmPadd a9//YpVaZIgA9XDWFe18kUtbVVadJRjeZTLwgp5J/VrpApAJe8pqElfTVTWmMF+cE7cRu1rI+1G4N vjXnYXa91+jP11eNzC2MhfRu1qmm6q/1YPV9nFLLLdY4ZBJDM/F+EJPLtw71pyY72aIGshZzHzZd8 LCnfnyBieOQbJSRAC2JCUSXN57inxg7I6lNZfWeLyqO8l9kSHx0CsCfYvf/7tIHEUCjvmp/J2sA1y KkNXSGYGj/+P/Ka3KFy9EdfE9dFS9NLdNNIZL8iUb9X8ONythNOabVeZZhg8ulJy4PN51g8JpH0pN aQ0hRo0Gk58FNy4wBm9Q==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iL9oC-0003Hk-Kt; Thu, 17 Oct 2019 17:43:32 +0000 Received: from [217.140.110.172] (helo=foss.arm.com) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iL9o0-00037f-3E for linux-arm-kernel@lists.infradead.org; Thu, 17 Oct 2019 17:43:21 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 89C5C332; Thu, 17 Oct 2019 10:43:18 -0700 (PDT) Received: from eglon.cambridge.arm.com (unknown [10.1.196.105]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id BD08A3F718; Thu, 17 Oct 2019 10:43:17 -0700 (PDT) From: James Morse To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2 3/3] arm64: compat: Workaround Neoverse-N1 #1542419 for compat user-space Date: Thu, 17 Oct 2019 18:43:00 +0100 Message-Id: <20191017174300.29770-4-james.morse@arm.com> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20191017174300.29770-1-james.morse@arm.com> References: <20191017174300.29770-1-james.morse@arm.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191017_104320_176303_5D3456EC X-CRM114-Status: GOOD ( 11.06 ) X-Spam-Score: 1.3 (+) X-Spam-Report: SpamAssassin version 3.4.2 on bombadil.infradead.org summary: Content analysis details: (1.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 1.3 RDNS_NONE Delivered to internal network by a host with no rDNS X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Catalin Marinas , Will Deacon , James Morse , Suzuki K Poulose Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 --- 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 f1cb64959427..1d09160fdd25 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;