From patchwork Mon Aug 7 22:00:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13345079 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 634B1C04FDF for ; Mon, 7 Aug 2023 22:03:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230388AbjHGWDE (ORCPT ); Mon, 7 Aug 2023 18:03:04 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230478AbjHGWCm (ORCPT ); Mon, 7 Aug 2023 18:02:42 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BDE00A9; Mon, 7 Aug 2023 15:02:15 -0700 (PDT) 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 5517362291; Mon, 7 Aug 2023 22:02:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 08AD7C4339A; Mon, 7 Aug 2023 22:02:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1691445734; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=AN8K1d1hM+FECwj4m7Q44SZ/vVwNunzEI3mgs/rR++hEMNfIoQxRuwsnk0qjuB3lV D1ZNx1pKCHk+jlGJrGhqOh03ixH+zIDWje3WQslo/D1VjOd106bw3/Sewy6jMx+PPV TA3QA7zrb5an0KKiv99PBqXcJNXT2FaKbYHwnhgdJud2Ks3fkjqiuhhdAI5ZR0azGN gknfBNDDPh/z83GWTFPRA2GBxjxry8PKjojl8sQPGAWKpAcNgul5FcX/4RCaCGUKEV ijrUeUtz+vIZ5kFF/s+GbtITiEDIGroF1ALAUkgPiZNea9bSzwDHJ0/UFAtzrojDet Jw0fbUZ3jTnXw== From: Mark Brown Date: Mon, 07 Aug 2023 23:00:12 +0100 Subject: [PATCH v4 07/36] arm64/gcs: Provide copy_to_user_gcs() MIME-Version: 1.0 Message-Id: <20230807-arm64-gcs-v4-7-68cfa37f9069@kernel.org> References: <20230807-arm64-gcs-v4-0-68cfa37f9069@kernel.org> In-Reply-To: <20230807-arm64-gcs-v4-0-68cfa37f9069@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-034f2 X-Developer-Signature: v=1; a=openpgp-sha256; l=1292; i=broonie@kernel.org; h=from:subject:message-id; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBk0WmdqU/RL8wRY7UGOdRitXWgZrgqu1X0IXUshUit KIiqVCSJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZNFpnQAKCRAk1otyXVSH0AZQB/ 9tN3nl/ebmiN0afW08bZaife7HUkEpbCB5l0jP7cgS+5CXXeUu/MNd+a4iyvAqFyTbsmhnZovZGciH 45jKvN0Wdj0v5UmZg8g2WhgEe8qrw9mJWRhS0xBR+xWz4XygskhCKc1gMDQFx+gVWkUnq3pbWwBmjc /XoE7pKFNO5K69hJIwETGuwcI9Sdjy3SY1si4ogJax+9xc0hV1/WRt1U1pEsjFbMsgi/15vufsROHp rVgmckZKCqz/Vgchnf4MUtrhlDduB4TDrKphXTQZca8fdLK3COFpPcYEm8U8rjs95G070cRz6cN2fw CPy0cLZ9DhsR8Cq008YQs8AYbWifzV 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 */