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 40973277CBF; Wed, 7 Jan 2026 21:23:42 +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=1767821023; cv=none; b=c6DtczoYcvhrm8qT8M4aQ1wV5VWnuVOwL0JhRPHdO06e4B4ZrNiz2G/y2gD9dPSRplWiMClfGXTYIehPNDjqfvzicgUf2du7dlUwu6b/Xith6T4HH9+8kIf1irMOHtNRAoyDQnGtgw3EkBwTZ59FqfJGqbP7fb4UfmXiA/BbbBg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767821023; c=relaxed/simple; bh=AnEgegXmP722NO+LZOGd51p9DTE89Pxwhfs1+6Jqhzs=; h=MIME-Version:Date:From:To:Cc:Message-Id:In-Reply-To:References: Subject:Content-Type; b=mH7KIbukVsQgHb6WYdvNeTb41anu2S/tQxtAZvb6HyJakipKAIQc6MN4rjK3Fs/kA1G3vubT+YbQFKKmqEHP+RxHXvXT3KhaMSG2M3idQoO8mv33a7ORycsaC+ft3ll5F7lb8izxRYOs9MtCmDHqfSLidlzz3xzZv1nC0zUvI34= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jaB6E9EA; 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="jaB6E9EA" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6CA1FC19421; Wed, 7 Jan 2026 21:23:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767821022; bh=AnEgegXmP722NO+LZOGd51p9DTE89Pxwhfs1+6Jqhzs=; h=Date:From:To:Cc:In-Reply-To:References:Subject:From; b=jaB6E9EAEHXXgCjnYNkee+3uuMpNKI9fQMbmLf2pfb92GuDz9fJ5MhBBKD4q+hSFU bVMqfu+SHaekV1EgsFQEiwQ/X9dZvqp2KhX/CrNqiHbJbJE2REYDpOak1yXCqKbErh Q567PVrivu8AyFqERtLxRhLQdv8utbwNxtkPaNWZeag1UB6xCyQCsdfffwN66JNxO9 3uwY8XbUd0MERHEVjymMnCzEX4IZmLLmvMFGLAnuGrowFeAlCO4Aw9PBLKv4EpwR/5 eAtl6l5KPuZutDL510pVgmHOH0/iYp+97y1+ToPSZfNEo3eWL35zzLJz2HPtX21oI1 09ovm+Xe6NT8w== Received: from phl-compute-04.internal (phl-compute-04.internal [10.202.2.44]) by mailfauth.phl.internal (Postfix) with ESMTP id 797C2F40068; Wed, 7 Jan 2026 16:23:41 -0500 (EST) Received: from phl-imap-02 ([10.202.2.81]) by phl-compute-04.internal (MEProxy); Wed, 07 Jan 2026 16:23:41 -0500 X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeefgedrtddtgddutdegudegucetufdoteggodetrf dotffvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfurfetoffkrfgpnffqhgenuceu rghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmnecujf gurhepofggfffhvfevkfgjfhfutgfgsehtjeertdertddtnecuhfhrohhmpedftehrnhgu uceuvghrghhmrghnnhdfuceorghrnhgusehkvghrnhgvlhdrohhrgheqnecuggftrfgrth htvghrnhepjeejffetteefteekieejudeguedvgfeffeeitdduieekgeegfeekhfduhfel hfevnecuvehluhhsthgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomheprg hrnhguodhmvghsmhhtphgruhhthhhpvghrshhonhgrlhhithihqdduvdekhedujedtvdeg qddvkeejtddtvdeigedqrghrnhgupeepkhgvrhhnvghlrdhorhhgsegrrhhnuggsrdguvg dpnhgspghrtghpthhtohepuddupdhmohguvgepshhmthhpohhuthdprhgtphhtthhopehr ohgsihhnrdhmuhhrphhhhiesrghrmhdrtghomhdprhgtphhtthhopehsuhiiuhhkihdrph houhhlohhsvgesrghrmhdrtghomhdprhgtphhtthhopeguihhgvghtgiesghhmrghilhdr tghomhdprhgtphhtthhopeifihhllhihsehinhhfrhgruggvrggurdhorhhgpdhrtghpth htoheprghnvggvshhhrdhkuhhmrghrsehkvghrnhgvlhdrohhrghdprhgtphhtthhopehl ihhnuhhsfieskhgvrhhnvghlrdhorhhgpdhrtghpthhtohepihhomhhmuheslhhishhtsh drlhhinhhugidruggvvhdprhgtphhtthhopehtrhgvughinhhgsehnvhhiughirgdrtgho mhdprhgtphhtthhopehmrdhsiiihphhrohifshhkihesshgrmhhsuhhnghdrtghomh X-ME-Proxy: Feedback-ID: i36794607:Fastmail Received: by mailuser.phl.internal (Postfix, from userid 501) id 57D2E700065; Wed, 7 Jan 2026 16:23:41 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ThreadId: AdM-YOrL1Uys Date: Wed, 07 Jan 2026 22:23:09 +0100 From: "Arnd Bergmann" To: "Linus Walleij" Cc: "Jason Gunthorpe" , "Aneesh Kumar K.V (Arm)" , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, "Marek Szyprowski" , "Robin Murphy" , "Matthew Wilcox" , "Suzuki K Poulose" , "Dmitry Osipenko" , "Thierry Reding" Message-Id: In-Reply-To: References: <20260102155037.2551524-1-aneesh.kumar@kernel.org> <20260105175323.GF125261@ziepe.ca> <0dccea36-0d79-42cc-a12f-5a890061ff59@app.fastmail.com> Subject: Re: [PATCH v2] dma-direct: set decrypted flag for remapped DMA allocations Content-Type: text/plain Content-Transfer-Encoding: 7bit On Wed, Jan 7, 2026, at 18:41, Linus Walleij wrote: > I did a grep 'alloc-ranges' but now I'm a bit slow in the head > so cannot really figure out if these will end up outside the > linear map or not. The way I see it, we have two ways of doing it: 1GB of RAM, CMA in the last 256MB: arch/arm/boot/dts/nvidia/tegra20-acer-a500-picasso.dts: memory@0 { reg = <0x00000000 0x40000000>; }; reserved-memory { #address-cells = <1>; #size-cells = <1>; ranges; linux,cma@30000000 { compatible = "shared-dma-pool"; alloc-ranges = <0x30000000 0x10000000>; size = <0x10000000>; /* 256MiB */ linux,cma-default; reusable; }; }; 2GB of RAM, CMA in the first 768MB: arch/arm/boot/dts/nvidia/tegra30-asus-p1801-t.dts memory@80000000 { reg = <0x80000000 0x80000000>; }; reserved-memory { #address-cells = <1>; #size-cells = <1>; ranges; linux,cma@80000000 { compatible = "shared-dma-pool"; alloc-ranges = <0x80000000 0x30000000>; size = <0x10000000>; /* 256MiB */ linux,cma-default; reusable; }; }; With CONFIG_VMSPLIT_3G, the first example spans all of highmem, i.e. 0x30000000-0x3fffffff, the second example spans all of lowmem at 0x80000000-0xafffffff. Arnd