From patchwork Mon Jul 31 13:43:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13334715 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 4A64CC00528 for ; Mon, 31 Jul 2023 13:52:26 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232480AbjGaNwZ (ORCPT ); Mon, 31 Jul 2023 09:52:25 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43144 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232243AbjGaNvt (ORCPT ); Mon, 31 Jul 2023 09:51:49 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 046DF1FC4; Mon, 31 Jul 2023 06:51:35 -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 662BE6115B; Mon, 31 Jul 2023 13:51:34 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 191C2C433C8; Mon, 31 Jul 2023 13:51:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1690811493; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=khHWcmOuBjaxE6JfX6GKCY29ifsNWk4hwBIAjFtpU0ZtoFnNnO8HiOedg/p0qOS+X QjvPxW7wdCDJ0bV8bocXa05z28tQRD5qC4cFot7/G6Wfk+xgFnSWI+YrJ0NxGhUhzd 5946m10rse8O7jOZXXbv+bi4k+tJIL8D8PP/zZJrecrTo9/aj6s7j8bYufzh3fCH7K PMyf1ypqSVvSaFDjRlqwjA7yAx+B4+SMjsDTDSqQlY0NkwQjLQuM02V5ei14rww0Yi 0mPL6O8tAmmPckdqBUeFaxSCb8XvkuMs02vXYdQBdPm/dd5DDKRtOuQ0lrc5S86gQO IMaMlrmbjBYeQ== From: Mark Brown Date: Mon, 31 Jul 2023 14:43:16 +0100 Subject: [PATCH v3 07/36] arm64/gcs: Provide copy_to_user_gcs() MIME-Version: 1.0 Message-Id: <20230731-arm64-gcs-v3-7-cddf9f980d98@kernel.org> References: <20230731-arm64-gcs-v3-0-cddf9f980d98@kernel.org> In-Reply-To: <20230731-arm64-gcs-v3-0-cddf9f980d98@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/pANAwAKASTWi3JdVIfQAcsmYgBkx7wZKQDFG7EFJkc2bMF4eSCe/iZHqCnXTSHwFYE6 WnETetqJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZMe8GQAKCRAk1otyXVSH0CjAB/ 9j+3rmzIjlTy5tKEIChK3iUWQnC1T22r1pFnN8c4M5Nd8WsaibvRYbBF3EbhUZyJQdmsvQpZeY5AJ9 xiHNOnUw+b+9wwioD+caREB9fc5TaEqYGg22UEz786dKDsCbB93fknph1PD0ZW4CnqiRRvboDNuf9f +zfadgAbTpHSArpqN83t6fsLk3mVbGb8owzBVY+WoUxUIk8Mun3G3aQV1Xy5ArSNe0Swks3x9a9xb2 dwVkdmtzGhd9ihuKD1ex2bjSFy38IQFidmvngCD/KC5Ws4H8zF110fSGWDzVJ1ivGTpLOecnPtkBKv Mf0goLJ09W8M+KNU6Mc0G5FsKGd5C7 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@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 */