From patchwork Tue Jun 25 14:57:36 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mark Brown X-Patchwork-Id: 13711468 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 B7812C3064D for ; Tue, 25 Jun 2024 15:04:05 +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=p394kNOGuUM4kB3+kce/KU992lWtCnOBaZy/f6a4gQE=; b=L0us7m/tTNNlb26/XNyRirj8aY IosLf7q8f4ibmlpKE36sA+9GGj2MdSGIibBCS4k2AbepgG06/rowYeMW7uxrUVxQ237T3I2Iq0Q8/ /U8MeYqEiQt79egUp6YAkhN1fqDbExrQUVVS8DdqU5/IRZc/9t7Td10NxJhApPaJQ3GA3a7dZJWkE NmL+XwSgFAHBtEvMlsP4jhCI5BLsOl9fulEVnFarHDeGg17QaEmJRs4VCNLR/WRyp7FWqbrtCbD3g jU/aISWJpkfvHvv2TM8SUYmjgKA04hQDwFJnKy5dlmFmuAFI9GNdlnY5YHadoirHgqmtvrdEwE99w pSM+4Kew==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sM7i3-00000003LcF-1d3x; Tue, 25 Jun 2024 15:03:51 +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 1sM7fv-00000003JnJ-0XbJ; Tue, 25 Jun 2024 15:01:43 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 52A246149C; Tue, 25 Jun 2024 15:01:38 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 75909C32786; Tue, 25 Jun 2024 15:01:31 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1719327698; bh=SpxTDPkJgZRI3y2Hq1n9QzpjFWZ3Gxi3l59ZtBf4jLI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=LCKBRIM7P1X1xpvsS4XEya+CU9QncvalN8/HgV0jOcZrtdPH96iZ79e/FfldlYcyQ KG4D/US9JjKXYl6B32tA/WiIsea5bmSRxlZ8rD+s9jRPHVCl2dfCCaNrSUGkPvyfTj f1I5FPA1gSm4owfH/cYTM//+93y5ac9PdpqIsqUC5aI5zL3mgYULmUS10eqDN02DIq s/+fZZEtRgCN8Yu91NoAulTdaszPk2cIrUC+Vub4cZGRGySZQD7qaEf30fZXBDXLWg apjmyGRWF49cRMCO2zvSf9I8skh6/KYYKTNe/c1B4e8lNgRIB89TjkLsb8q6EKyBRI v632mqX63KxEw== From: Mark Brown Date: Tue, 25 Jun 2024 15:57:36 +0100 Subject: [PATCH v9 08/39] arm64/gcs: Provide put_user_gcs() MIME-Version: 1.0 Message-Id: <20240625-arm64-gcs-v9-8-0f634469b8f0@kernel.org> References: <20240625-arm64-gcs-v9-0-0f634469b8f0@kernel.org> In-Reply-To: <20240625-arm64-gcs-v9-0-0f634469b8f0@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 0.14-dev-d4707 X-Developer-Signature: v=1; a=openpgp-sha256; l=1103; i=broonie@kernel.org; h=from:subject:message-id; bh=SpxTDPkJgZRI3y2Hq1n9QzpjFWZ3Gxi3l59ZtBf4jLI=; b=owEBbQGS/pANAwAKASTWi3JdVIfQAcsmYgBmett4CKl1cP0GjqsEsHZQn+ZUgv8UOnY1gwbJGEPy 0nF1gWuJATMEAAEKAB0WIQSt5miqZ1cYtZ/in+ok1otyXVSH0AUCZnrbeAAKCRAk1otyXVSH0GTvB/ 4rzP26uQ2jw9FuRsJAqw1gE2ydgI2bc/iKdMxs34w3uUiteyu1KQntu5r5O6S/pDWsDvBv9DBJSjbX C3BsRvj08B3YrbhlpjJ8tIwJrzT0vK8lfVijApbbnDEGHfkQ+ktEFeGlNYYxlpcM0Dua+4CplUqp5v URfmO1+u9hbBub4a7rjyBrKim/HyioooMWWoj15ZNBrNVzgiZwuDPsq+EFXJ4OTwDXDflKXC4mpytk yRKGcwTpLlL/Y5xmDIsOW81n+j6uhypg+JIlOx/pXvC2LYHCcqFjuGdcEZetVcrga5Km8RdHiVztO4 fEt0Wr4EPbNTgi0mUCzBzWL4XUs9a/ 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-20240625_080141_033896_65E2FFDA X-CRM114-Status: GOOD ( 11.06 ) 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 --- 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 */