From patchwork Thu Aug 1 12:06:35 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13750429 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A259EC3DA64 for ; Thu, 1 Aug 2024 13:02:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References :Message-Id:Content-Transfer-Encoding:Content-Type:MIME-Version:Subject:Date: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=+fN4ByY0FzRDwLIySX1hIe9Ll/YoCNC7ejriYTNI6D4=; b=zjCR54MDnX1UMAH31/TYPvuh9x TwJXab/KOSXXfxyCLGd4+V/nL52NphUjdTTpRcomozDgsa4hN3PlVXUMwDrJZlY4d1Rceq178ldai l3qm+NBckAcZUgK3QeXlLy8xqynxEj83HrwEwUwCy7+QkXTQWM4WUQRKVz+5PW7Y+/YPYBJ9ueZDA S0d0s9uNUmH81aYyOFG9rJrPm9n4mHyjBfAFJg6somqjw4pZODLzWm2mKPU6NLBkU1gD5fWKw7Ket hRB94ndjCR1KlVtzAifDmBz+Qatmh8VERFhdYW3tTdf5A2AQ/mM0eLYG/9x8uz063ZSFNlmPVSC2W Q+iTzCFA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZVS7-00000005L5Y-2Tjx; Thu, 01 Aug 2024 13:02:43 +0000 Received: from dfw.source.kernel.org ([139.178.84.217]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sZVNn-00000005I9i-2J3f; Thu, 01 Aug 2024 12:58:17 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id D640862890; Thu, 1 Aug 2024 12:58:14 +0000 (UTC) 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 Date: Thu, 01 Aug 2024 13:06:35 +0100 Subject: [PATCH v10 08/40] arm64/gcs: Provide put_user_gcs() MIME-Version: 1.0 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 , 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 , 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=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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240801_055815_773242_034F570D X-CRM114-Status: GOOD ( 11.54 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 Signed-off-by: Mark Brown Reviewed-by: Catalin Marinas --- 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 */