From patchwork Wed Nov 22 09:42:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 746295 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id ACAFD16407; Wed, 22 Nov 2023 09:44:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="skgEBYvx" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 96852C433C8; Wed, 22 Nov 2023 09:43:53 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1700646240; bh=vd1vSvagODzOx6kbpI7IvwSkS4eBsjmFRyLwRdBrVrA=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=skgEBYvx/fAYU83PbKMGhZ+jFRWnelXbJMhtlbDO94lZzbLAQu2e6sHPZRgWHd+sx gtvmAgwjSpvlSEQjQzBmlxxsXWS82g6bxtvPaFkQ8pvd5rEGx1NUa6mmsajYrS2HXJ 9SUa7yYSQ4By+Yl/Qgm1N6yHb1EuBPq31sojdUVFxdN/L6m2Rc5/En1jfZfcN6fVd0 1Hue8SThE2M1637XnM8B3AjO9hFNOP+uQE1W0maFQM8JCIjJ7WlFtq4sCyHcLk/Da8 60C8qJmM22SVHPuFPEY+HS4Qp3f7l5E4nEP4L2Ac7hl6Qa7XDz7Xjm83GZP/ILzYcJ 5IDYaXeS3YwZg== From: Mark Brown Date: Wed, 22 Nov 2023 09:42:19 +0000 Subject: [PATCH v7 09/39] arm64/gcs: Provide put_user_gcs() Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20231122-arm64-gcs-v7-9-201c483bd775@kernel.org> References: <20231122-arm64-gcs-v7-0-201c483bd775@kernel.org> In-Reply-To: <20231122-arm64-gcs-v7-0-201c483bd775@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 , Thiago Jung Bauermann , 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=1037; i=broonie@kernel.org; h=from:subject:message-id; bh=vd1vSvagODzOx6kbpI7IvwSkS4eBsjmFRyLwRdBrVrA=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBlXcz9ntfDGYRfW3xISuNKutZJXpSjiIRaViJ0k n4sUnukccCJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZV3M/QAKCRAk1otyXVSH 0N3bB/44FbabVeFeFQXmXvNQGbQr73EvxPiLmtFhVunzGXVexn0MqHJIPQxDC2ugEGWeKqK+7nz mHcpRXkSvzsDxa0SVk2G9hz7TrXNC6LMK87Ap6mUxpUx/sl71tnM08rKVQzi+iw4Ye5ZPtSiDWW L5diQOrA4wDNpimxkSurVohp7umfjFe/leUGxJGrezbj+MEWgxqb/endM8PgCOg4sdzQBljGFdX WMXW9ZlcwjjEOdBjomF3WAbeNIdpvDJQHFW9t9p9cLOLrxovGepwQ/qOzb7pt0bnZZ/ely3LOX/ 7IrP/ur/Ss2aXoZkMeS2okOUMjg3vSIb9e5S9aaS+RcHJC2B X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB In order for EL1 to write to an EL0 GCS it must use the GCSSTTR instruction rather than a normal STTR. Provide a put_user_gcs() which does this. Signed-off-by: Mark Brown --- arch/arm64/include/asm/uaccess.h | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 22e10e79f56a..e118c3d772c8 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -445,6 +445,24 @@ static inline int gcssttr(unsigned long __user *addr, unsigned long val) return err; } +static inline void put_user_gcs(unsigned long val, unsigned long __user *addr, + int *err) +{ + int ret; + + if (!access_ok((char __user *)addr, sizeof(u64))) { + *err = -EFAULT; + return; + } + + uaccess_ttbr0_enable(); + ret = gcssttr(addr, val); + if (ret != 0) + *err = ret; + uaccess_ttbr0_disable(); +} + + #endif /* CONFIG_ARM64_GCS */ #endif /* __ASM_UACCESS_H */