From patchwork Sun Jul 16 21:51:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13314940 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 kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 4804DEB64DD for ; Sun, 16 Jul 2023 21:53:43 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id DA70F6B0081; Sun, 16 Jul 2023 17:53:42 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id D304A6B0082; Sun, 16 Jul 2023 17:53:42 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id BAA258D0001; Sun, 16 Jul 2023 17:53:42 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id AB0366B0081 for ; Sun, 16 Jul 2023 17:53:42 -0400 (EDT) Received: from smtpin17.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 83309A0283 for ; Sun, 16 Jul 2023 21:53:42 +0000 (UTC) X-FDA: 81018827484.17.86F4908 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by imf15.hostedemail.com (Postfix) with ESMTP id A54BDA000D for ; Sun, 16 Jul 2023 21:53:40 +0000 (UTC) Authentication-Results: imf15.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=N6Pc2CDP; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf15.hostedemail.com: domain of broonie@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=broonie@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1689544420; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=mJroho1o7mQ4v5IpLO3pGU+gSm8jYAJUrZ5Tuta6VfI=; b=dkanibZ062rIeqqeXISxqFblLFzwmTOoHt/TgRjCCgybuba++8J0E1lnWKjkeFUkHbp3tw BERV82KYdhu0fcU9OZQcP3xIBuKCK1fRA93/Y8DVCBy5eLNjFUKKkJW39smv9tgd+vP8jr ggDSyEePDYBjCI5EbNOCojebVNKEkVU= ARC-Authentication-Results: i=1; imf15.hostedemail.com; dkim=pass header.d=kernel.org header.s=k20201202 header.b=N6Pc2CDP; dmarc=pass (policy=none) header.from=kernel.org; spf=pass (imf15.hostedemail.com: domain of broonie@kernel.org designates 139.178.84.217 as permitted sender) smtp.mailfrom=broonie@kernel.org ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1689544420; a=rsa-sha256; cv=none; b=042ne+dCHLQsYFBMlvqaSBc74qwsjOHx0wJyrAZDXf8qQN5WjuNvcJY2p8OsfRWVpUBfh7 irY4xF18X66ebgHqY5+ZJ3gmgMLzAi8BswO6GRzVnTev3XaYlMcWJsm0Z5TBIS19+8DxYf YRoB5hYbgRaUSs97WWIwgVHC8FPiyWc= Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id EBE0360EBC; Sun, 16 Jul 2023 21:53:39 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9AC2FC43142; Sun, 16 Jul 2023 21:53:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1689544419; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=N6Pc2CDP2Fb/CWuUDjX3L2i0ZPs0IpSy9dO8henIB7I6mnpUje22Hdq7vEkPoDu4g xlUhGW7pGAfAaNvDt/AWVxPC9oVQigNpTWBFs3yT8OmZrnurbVB6ZSH47hJ8kJHGps /CKIzVsFqEyOneTsq1XBiXSubk3NPS/GJ53et7TS5RCXk8P8JPg9TJv7ADl3cE+jMR 2Lv7yqFwLn763rYXqdfJmftd7l7TfWFXs77BEpS4ZRGT1pc7HfxAL+znSFso1IKx1B OWq8cE8ajUxaBeQT9T5L2qJfdtU3Rk+8gE/R1JgbzSnLYpvSNL/Kk+RDrNFzSoSKjD hOnLbmzUYvqMw== From: Mark Brown Date: Sun, 16 Jul 2023 22:51:04 +0100 Subject: [PATCH 08/35] arm64/gcs: Provide copy_to_user_gcs() MIME-Version: 1.0 Message-Id: <20230716-arm64-gcs-v1-8-bf567f93bba6@kernel.org> References: <20230716-arm64-gcs-v1-0-bf567f93bba6@kernel.org> In-Reply-To: <20230716-arm64-gcs-v1-0-bf567f93bba6@kernel.org> To: Catalin Marinas , Will Deacon , Jonathan Corbet , Andrew Morton , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Arnd Bergmann , Oleg Nesterov , Eric Biederman , Kees Cook , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , linux-arm-kernel@lists.infradead.org, linux-doc@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.org, Mark Brown X-Mailer: b4 0.13-dev-099c9 X-Developer-Signature: v=1; a=openpgp-sha256; l=1292; i=broonie@kernel.org; h=from:subject:message-id; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBktGaVbZOcNR1zm48d/PDpByZZT+P9TDlC/pnz5eN6 pCwzjnmJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZLRmlQAKCRAk1otyXVSH0NbvB/ wMIKD7ugV+VGhtSx4GuImqrZE4Tt0v3p8oBLZxXnjjkk1AYFsZ51ITwpSRYveuCeKhGKo5TdlPUqq5 TGV7QEaKfNACSPh5SL7WiaECcFcN2MFP4z0THUL92xm6KgWL8A5oYlnHOIbNrYSp5p+HKE5VzgWCLS Bel51HElY2q2sRqHhDjGaBnNawBEB+529JBmGA4cJrZWRzpq1QDAAlDitHTbFgXJqkPHlYS0HrDocs 7p5w7QGKS/6G7JCZKBJOh6NXwMc697BG+KkqF9GoRnNKL5uLZxWkUHt86kkP+CXzx2r70LhZbSffyb gkXMfL//6nmpK2o0vvxfDTXp2gd7H/ X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB X-Rspamd-Queue-Id: A54BDA000D X-Rspam-User: X-Rspamd-Server: rspam05 X-Stat-Signature: fd7caco3tysmis3udhm7kmyun6jqfrux X-HE-Tag: 1689544420-889029 X-HE-Meta: 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 Xo3x0ikr DpdF8Hd3IyXujCb15VtUiKscsQW9q2NfDUWk91MSjrZBoJVBfJBHuv8K13LwhEWy6GhXlMb8HXCm+LJn4UOS8LiNSnHNk3rroDldN9eTSPK951+O74qdqjF7FlCpQzZ/gGGopkKW8t9+bgE3LGEPnV0O/KRAkk8nYxIujcTual8/cOqShqdfz5KRYcwk5RQSjCq3LcdImFJweKMl7Bw5lkemEELYLsMSDdbl6V9RsXkyWvsrnodf1CLKQHYFEOfjubbyAIcD6syDkoqfjOyeFrkO9kTDMD3FH38+7hSqf9XbKY1+GeQ4e8yHAZWXPlspnadQA1Wq/O3VOsWLwen8GEqC/rJ7qYDiS9CB161OnvlIZK9z0wXHJvKCl+s8XUveJFCo+6/0/Nle380QsX3YnfuI8hNhnmxXwbuTqKZG3iTOHYkXTylqAOKdLq6FYI/kKyNBLWnU8wRYZ+3Yx6EN0MMat9Q== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: In order for EL1 to write to an EL0 GCS it must use the GCSSTTR instruction rather than a normal STTR. Provide a copy_to_user_gcs() which does this. Since it is not possible to store anything other than a 64 bit value the interface is presented in terms of 64 bit values, using unsigned long rather than u64 due to sparse. Signed-off-by: Mark Brown --- arch/arm64/include/asm/uaccess.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 22e10e79f56a..24aa804e95a7 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -445,6 +445,26 @@ static inline int gcssttr(unsigned long __user *addr, unsigned long val) return err; } +static inline int copy_to_user_gcs(unsigned long __user *addr, + unsigned long *val, + int count) +{ + int ret = -EFAULT; + int i; + + if (access_ok((char __user *)addr, count * sizeof(u64))) { + uaccess_ttbr0_enable(); + for (i = 0; i < count; i++) { + ret = gcssttr(addr++, *val++); + if (ret != 0) + break; + } + uaccess_ttbr0_disable(); + } + + return ret; +} + #endif /* CONFIG_ARM64_GCS */ #endif /* __ASM_UACCESS_H */