From patchwork Wed Aug 28 23:27:25 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13782132 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 934651AE034; Wed, 28 Aug 2024 23:29:37 +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=1724887777; cv=none; b=aPFkirRgI9REMgBbuwd+YVPwT5M4fC1zHInc+sOVHcnTSAayMpLcDaWr3piqIoS5S0BBjVBK3+vDiATG+5oG3iPdG7QnNEwLk7tanwSjcorhgr05rpeBXv+zcx+Z6cghEMO2jrx2gqnMB1fxE4iZ3TKgvPFV3RMXVWzvsU3bg7g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1724887777; c=relaxed/simple; bh=0WRESyvBFvhlHiGA4Y8lOQoOddezzHHj49JAXCWn5As=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=QOlUW0C+6vbGI2ZYTF+DT7sJG6VqLxTrFolJrf+g9Lj1291MBbRmYPtHr2hTBSGjoakVVmCaOPSx48pmu4nAljGbPdGoYteTznz4JBpv/+ulcmStVOM6MOtUGb5QZLLW2HdhVTOgNviggwN5K+XjpMmI8Hy2kFNPA1WdNxMApew= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=TQCBLNOT; 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="TQCBLNOT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 509A0C4CEC5; Wed, 28 Aug 2024 23:29:30 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1724887777; bh=0WRESyvBFvhlHiGA4Y8lOQoOddezzHHj49JAXCWn5As=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=TQCBLNOTt4uPoil78DH70AOWVpIT6LIQ5JGnF8pCl9Kwb2+T2aoH8vA75dLA88j4y KzL26gabHDxytCwlUFatG6fR1Zvr5uTqt2pShr3pPCTMn33PxgrgHv/pPqIxtTLFnQ Ey1twIbnnj5qLHrSSrYYGfsUjFldPiC+SUfCZAAFNmNW+3Xa3o4eriYNIwXnPNhtWI 1ohkI3dobfcvnJLKqjUPXbtK1H5vOU58SMjFghxknNoLATb+4juyD5w/c/Ag8Wp2Ci OtqF9pP5xADxmHSkNwnT2wu9pMyM7UgrrXlopqBfP7xPJ5s52DOIQb4ZQoKDa55z6X 6aqd4cZGM2Mdg== From: Mark Brown Date: Thu, 29 Aug 2024 00:27:25 +0100 Subject: [PATCH v12 09/39] arm64/gcs: Provide put_user_gcs() Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240829-arm64-gcs-v12-9-42fec947436a@kernel.org> References: <20240829-arm64-gcs-v12-0-42fec947436a@kernel.org> In-Reply-To: <20240829-arm64-gcs-v12-0-42fec947436a@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 , Shuah Khan , "Rick P. Edgecombe" , Deepak Gupta , Ard Biesheuvel , Szabolcs Nagy , Kees Cook Cc: "H.J. Lu" , Paul Walmsley , Palmer Dabbelt , Albert Ou , Florian Weimer , Christian Brauner , Thiago Jung Bauermann , Ross Burton , Yury Khrustalev , Wilco Dijkstra , 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 0.15-dev-37811 X-Developer-Signature: v=1; a=openpgp-sha256; l=1159; i=broonie@kernel.org; h=from:subject:message-id; bh=0WRESyvBFvhlHiGA4Y8lOQoOddezzHHj49JAXCWn5As=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmz7J/KST71VyjmixMxH0mLOiq0X9OEBGYvS8Br+Qk rapbHhCJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZs+yfwAKCRAk1otyXVSH0IEyB/ 9dPMuvqOeex4MLAMJJV3WaYG8PgSfjupmm2EgWeN3PodFZUAH1v2ObWF8R8GWSN47b867WTbPrnUK2 E/z43W2Ch+wVpTSLr0+bF7FvoXBo0Zw+4qi29psoG61NIvksaICvPytuz4veHug8g84QxMfdgBrQJB waIKJHxR3e1CluOtD4ERbimgFq6MquNG+8P0BrwkJc8CIWY4jiqKIf2vNmE2qBHtCKZ2jw8/yPZqzU UMi4CggPBy3S2pqqaubqBzuXEUqXzrbZc2hnNo2XHtn6LVzbBO0JtSHb03LM2SRFNANo/InJvS0Net +SJZZSugc6TOvTjh1Xb/ZHbpGii1jW 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. Reviewed-by: Thiago Jung Bauermann Reviewed-by: Catalin Marinas 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 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 */