From mboxrd@z Thu Jan 1 00:00:00 1970 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 983BA24728F; Mon, 14 Jul 2025 11:54:51 +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=1752494091; cv=none; b=OaCMfs2ilf6dziXAtuzPJh9tjZ6LLAZuX8KnfxWP7PCRW7wjmHuQQ6nED7b+Xue9z1tYkiPonrBQ5fRT5pGf4mDtsbdu2wDYvcDteenT2nz5y95LFFRFj912vaSOKFnTQuaYpMfQDxPPrqVkeRw3Aw5JNPuYxTGsc99EKRPC1VU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1752494091; c=relaxed/simple; bh=d0joSu+CYHb5OJCnlRZ4ebbkZ3bY9fgZjzT8Cp/Aqi8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=gp7DE1Y6JGxp3W0QtnnQF5XJOO99smlmPyu2pR/+xNkIGI0eWvWA5KIYQPkKvmu8dwUE4/ngfyRKxnFBn6F+UIGs8k2PwZC4iljE8luYDul/H693MuxMqKK672yYrhHopeQKrx5CpQ/uoS/HW1/8KOcY8VC1wjKNG6Hs7I7D94w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=XpQXCszR; 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="XpQXCszR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1B100C4CEF4; Mon, 14 Jul 2025 11:54:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1752494091; bh=d0joSu+CYHb5OJCnlRZ4ebbkZ3bY9fgZjzT8Cp/Aqi8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=XpQXCszR2pubUtIf+QwsIjfF08bbyU/kiEshe5/ToEoj4I7WHAtOf3/89BFTUK+8w BXsvNNrLhOtKrNb7CaGBrBlb5wC5CYcLKz6EYDC4NFwyN1WCrBh75LOK9jS/JFeSft f1SvUOAs/EOcb7eIjVBMssLHTUv/Uq5DrzobyTKdn1h2HdXGdP7KihK5moScSCwTxn uUcrNQQfIlr9kSJcah84/q79DgGR5rOoM5KfXzaJEJOc9nvNhahZokQDP3ML14QopM bQX9erDnWxVFiV8B4U9Wi2q1S1dHUYGVDbNd11KDGJHD9lCPJxDe2fgVLPXa62PTYp ieMOEgyJjAVzg== From: Will Deacon To: Marek Szyprowski , Joerg Roedel , Robin Murphy , Krzysztof Kozlowski , Alim Akhtar , Kaustabh Chakraborty Cc: catalin.marinas@arm.com, kernel-team@android.com, Will Deacon , iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-samsung-soc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] iommu/exynos: add support for reserved regions Date: Mon, 14 Jul 2025 12:54:31 +0100 Message-Id: <175249276902.1459797.13570182845894865373.b4-ty@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250712-exynos-sysmmu-resv-regions-v1-1-e79681fcab1a@disroot.org> References: <20250712-exynos-sysmmu-resv-regions-v1-1-e79681fcab1a@disroot.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit On Sat, 12 Jul 2025 17:19:30 +0530, Kaustabh Chakraborty wrote: > The bootloader configures a reserved memory region for framebuffer, > which is protected by the IOMMU. The kernel-side driver is oblivious as > of which memory region is set up by the bootloader. In such case, the > IOMMU tries to reference the reserved region - which is not reserved in > the kernel anymore - and it results in an unrecoverable page fault. More > information about it is provided in [1]. > > [...] Applied to iommu (samsung/exynos), thanks! [1/1] iommu/exynos: add support for reserved regions https://git.kernel.org/iommu/c/2d70fdd9b5c9 Cheers, -- Will https://fixes.arm64.dev https://next.arm64.dev https://will.arm64.dev