Message ID | 20240801-arm64-gcs-v10-8-699e2bd2190b@kernel.org (mailing list archive) |
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State | New |
Headers | show
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 D14801A070F; Thu, 1 Aug 2024 12:58:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722517095; cv=none; b=DC3zpxt0Yk0uc/U00VNlPsEBJ/RJIedLhmS8QLATvj6MJSdrxq/DiCoXAd0+bwLYP9rEBxpzcLm2opH+KITnImd7jZ444OSv3avZYAxsm9R93MoI7vScpsVEm4v/TjseC6ePQu3OSpKQPREXT3cM19e+kH+reBldmy6+KI8ErtQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1722517095; c=relaxed/simple; bh=9zyM2kDwaHrPoIdC+tOITu/EBfLF+6/APyyopskSW+Q=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=hFpvMS5u4X9ES2PUacen/wFIaviaGfOQAI1Z0aKJxdetYZkUmJFGEDcZAhKvh8rBOfP36H+CXJPOl/G3iNReTpKUfBQoiAUdW9UqRFbYNn4XiXZamrORweSb+8n4Pu4PM7ejyyLjmv76AMfFR//uG2+x1qhCr61+VjbWkn+BhNo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=MbNqHBPc; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="MbNqHBPc" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4743BC4AF12; Thu, 1 Aug 2024 12:58:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1722517094; bh=9zyM2kDwaHrPoIdC+tOITu/EBfLF+6/APyyopskSW+Q=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=MbNqHBPcT9Y5beIJ6gploRPX48lF/ic8+DFzi6qdc6cvt1vT0gJAFXuZWU/kINSbG w01rYdOQQA70NsmuDwunpJubsh8i49z3114zgqs38oC03JE2Bqoc6n80qPrvENvVII 81drmw9RC0wAULSAgtpeMwsJVVFhmHjeXiwAARS7LEA7/G0/xLGStM6i1X36yW9kla DOX+sdvAgON5kBgQ4fl7b16mFYaxAlkwxQdWUoOUlKpWlx2i9A9Jh1XksQdoAltZZH gr93pgYFmS5Q3Kyna7upwfm/6x7XCQYA0Sya8gOelUhPJsMBBrgnSlvAZwD8zwzTBc y0OUMFpqw4uNA== From: Mark Brown <broonie@kernel.org> Date: Thu, 01 Aug 2024 13:06:35 +0100 Subject: [PATCH v10 08/40] arm64/gcs: Provide put_user_gcs() Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: <linux-fsdevel.vger.kernel.org> List-Subscribe: <mailto:linux-fsdevel+subscribe@vger.kernel.org> List-Unsubscribe: <mailto:linux-fsdevel+unsubscribe@vger.kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240801-arm64-gcs-v10-8-699e2bd2190b@kernel.org> References: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> In-Reply-To: <20240801-arm64-gcs-v10-0-699e2bd2190b@kernel.org> To: Catalin Marinas <catalin.marinas@arm.com>, Will Deacon <will@kernel.org>, Jonathan Corbet <corbet@lwn.net>, Andrew Morton <akpm@linux-foundation.org>, Marc Zyngier <maz@kernel.org>, Oliver Upton <oliver.upton@linux.dev>, James Morse <james.morse@arm.com>, Suzuki K Poulose <suzuki.poulose@arm.com>, Arnd Bergmann <arnd@arndb.de>, Oleg Nesterov <oleg@redhat.com>, Eric Biederman <ebiederm@xmission.com>, Shuah Khan <shuah@kernel.org>, "Rick P. Edgecombe" <rick.p.edgecombe@intel.com>, Deepak Gupta <debug@rivosinc.com>, Ard Biesheuvel <ardb@kernel.org>, Szabolcs Nagy <Szabolcs.Nagy@arm.com>, Kees Cook <kees@kernel.org> Cc: "H.J. Lu" <hjl.tools@gmail.com>, Paul Walmsley <paul.walmsley@sifive.com>, Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, Florian Weimer <fweimer@redhat.com>, Christian Brauner <brauner@kernel.org>, Thiago Jung Bauermann <thiago.bauermann@linaro.org>, Ross Burton <ross.burton@arm.com>, 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 <broonie@kernel.org> X-Mailer: b4 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1103; i=broonie@kernel.org; h=from:subject:message-id; bh=9zyM2kDwaHrPoIdC+tOITu/EBfLF+6/APyyopskSW+Q=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmq4YMRl/JJcB0rkEcqgIQ8gNudAtrXaRRngscnrbl bPqr4syJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZquGDAAKCRAk1otyXVSH0FzhB/ 9vnbFMIfpN3H8ylPPtfhBn++BSFNylLU467N/+QYoDoXnkw48vtuHXvlXdbhmG/pVEekaIYqr4GbWj zTbVXnZdpLmf7S0M6QwCO4+jX59+0EOzOzIMR/69gC1VgZ4ZKDB5QA+Rx/l35VUF7O02mso6fO+HG0 2qbZzy/7tnkXVbPiyYZnF+OYGE+wK4xseNeRUDCnMYSKpPokJkZ1M86zvEhAkA9L9+nCGNYpPWot+T 3vcDQ8wwL6TUiu6/gDqeVp38IKPlTX3LZXVQecVANGqtSEzyzf+TT/qE0Fq7ArvcD9PXt2GrcIARrn lTxU0WZ6Qu9SZe+Heyb4/hIEo5nDr5 X-Developer-Key: i=broonie@kernel.org; a=openpgp; fpr=3F2568AAC26998F9E813A1C5C3F436CA30F5D8EB |
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arm64/gcs: Provide support for GCS in userspace
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On Thu, Aug 01, 2024 at 01:06:35PM +0100, Mark Brown wrote: > 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. > > Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org> > Signed-off-by: Mark Brown <broonie@kernel.org> Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h index 6aba10e38d1c..ecdd47cf1d01 100644 --- a/arch/arm64/include/asm/uaccess.h +++ b/arch/arm64/include/asm/uaccess.h @@ -522,6 +522,24 @@ 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 */