From patchwork Tue Aug 22 13:56:41 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13360831 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 1ADBDEE49A4 for ; Tue, 22 Aug 2023 14:04:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236335AbjHVOET (ORCPT ); Tue, 22 Aug 2023 10:04:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49644 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236325AbjHVOES (ORCPT ); Tue, 22 Aug 2023 10:04:18 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id DB4D7E4C; Tue, 22 Aug 2023 07:03:53 -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 6C83365781; Tue, 22 Aug 2023 14:03:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C568CC433AD; Tue, 22 Aug 2023 14:03:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1692713032; bh=BppDdcqjtJzUfuzafP5lgvHCeya4NknqM0BAXJ7ap7w=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=mlWvTaQN07byyUzf1CBPUuiCl9atcm+iFpXcZmmFNSmydMgUfR9Rw39AUOJUkgAlY 2ZhFmfLAiOVE0KR5rqzK64Y9wa+362rOFL2nSiv41fd+92xgrMb5lXRk9amGjzDiPl imKu7mTPRF/okPy2sPUrCYGFbC/oj4SsClfRrGG6wEht1n0l52rv+nkpo5tVAWT/SV R0y/z2PghYtCsriK0v7vPuUS/hca6R6jYYbOMSH1xbdzhbXFvp9XQjG7QyZrcZaRH2 2lCoZdZXeFCb7YWDwQzZy/SaAlMuy3Ta7YsUBu07sb6hEvORsAGhsAW6ZfM5sbCzQa tRmUlf7VQmSYA== From: Mark Brown Date: Tue, 22 Aug 2023 14:56:41 +0100 Subject: [PATCH v5 08/37] arm64/gcs: Provide copy_to_user_gcs() MIME-Version: 1.0 Message-Id: <20230822-arm64-gcs-v5-8-9ef181dd6324@kernel.org> References: <20230822-arm64-gcs-v5-0-9ef181dd6324@kernel.org> In-Reply-To: <20230822-arm64-gcs-v5-0-9ef181dd6324@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/pANAwAKASTWi3JdVIfQAcsmYgBk5L/2Me+ug3ePxzuzvoPm/hkwGj724zhTCzq2OzFW adIGHHOJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZOS/9gAKCRAk1otyXVSH0HRNB/ 9IUqNzEcbTEiNkLKuvna5fOzaKYr0ARo6fUoTtLXYMcvFVGLqvFurGEIYTQ62h+JPsILa7aMNFnw4z VXRj2dmEWVI3pLWCLOr3qPOUTG+Vktj+ZmWNDlYliT8wxXwdr1uot7HkFAXMEMubHo+4yqgCyOzuBV D7Jazz4z1qhrfGraLs5Xba8n6eWy1dwiwOMOrOvyFmPFsamJeSsZAJ/AKIdra5hSkwWVGy0bh2I7YI nrtiIi9lgKkLnDsm2UMZiz2E6I91LWEdbrTyYOYaiTLKFYwfYf8GCOZRqeu08XGB9WIoOT5blki5S6 PMPDPPcgWVE8jZnwHus3N+ebSV+EmD 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 */