From patchwork Mon Oct 9 12:08:43 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13413473 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 598EFE95A97 for ; Mon, 9 Oct 2023 12:12:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1346541AbjJIMMb (ORCPT ); Mon, 9 Oct 2023 08:12:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:32832 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1376302AbjJIMLq (ORCPT ); Mon, 9 Oct 2023 08:11:46 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7A7BD1A5; Mon, 9 Oct 2023 05:11:39 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8334C433C7; Mon, 9 Oct 2023 12:11:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1696853499; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=nRXCf3IP04mxomb59+FPqFvNeFFferKhb4+ll7uI89/W4+e78a9mJLKf6QHmmidyZ 7z/5VLjrJo6vvICYH6T3MNNBcCIhgo75AlS8oAhFsH1H5oXIAIVbO2GHLOc9Eql7EU RuYStvvqFpSYuwqfKGoTedCsXt9rmPTpIcWvtooljyquoQ64vzqW8B5Xu4Y9r5G/UA plNxb2NEue4mStms8VLWFaRhrYwe97jxi1zX0PuJQe0xXV6B9IJkAYchVqYB3jLDBd FnewL1JOM+NuyhQP2NYJZGT/0b8pkoa2zX+S21Dg32uCsDkp8n2wdKXEvkGQVMCCsg L0ZVIbqvSMc2Q== From: Mark Brown Date: Mon, 09 Oct 2023 13:08:43 +0100 Subject: [PATCH v6 09/38] arm64/gcs: Provide copy_to_user_gcs() MIME-Version: 1.0 Message-Id: <20231009-arm64-gcs-v6-9-78e55deaa4dd@kernel.org> References: <20231009-arm64-gcs-v6-0-78e55deaa4dd@kernel.org> In-Reply-To: <20231009-arm64-gcs-v6-0-78e55deaa4dd@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 , Florian Weimer , Christian Brauner , 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-0438c X-Developer-Signature: v=1; a=openpgp-sha256; l=1292; i=broonie@kernel.org; h=from:subject:message-id; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; b=owGbwMvMwMWocq27KDak/QLjabUkhlTltzOS1pv1T2Ztq80/z91/JcylNk5K+4vYp581J1n+ysaV t9R1MhqzMDByMciKKbKsfZaxKj1cYuv8R/NfwQxiZQKZwsDFKQAT+fyd/Z/uYTmT+1qcLE1xGh8jeb hqPLTWviyYlseUlDmfQ9vbuD8gk/Pf1ojqStkZFcHrH2p1lUdbGqcYKC/RsBUN/M64lfmh38OyE3Mr EnLz5fQW7Y7fWZa76o6UzRE1HqMlE3ftmxPv+HShlMf7ujvscjo+f28EMz+qyLjo+lnMmW2Hf1PxRM 1+kw0JjCIbH2lJrN7LpCDYU5O4YsoaGfaQgBU9P7w5r9Y+L89lv7X2k92ETtOEVLf234Esp8UNwgUf rpjy6tV++VelIc4+03NYfzsKCYXMmBfmO8H18gE5O3X/jzK6UZsO373dcnPZ0Uczlshf5j62av3F96 xcV1zy1ynv3fr5hcWvMqn2UsGLAA== X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org 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 */