From patchwork Thu Sep 5 21:15:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 13793005 Received: from mail-ot1-f50.google.com (mail-ot1-f50.google.com [209.85.210.50]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2B45B189B8C for ; Thu, 5 Sep 2024 21:16:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.50 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725570975; cv=none; b=T+mt9TpVql0bfsH1OO3HOpbwRk2/QirvPl+RpxQkJzfmzXT3pZE2N1XwXB0O993Tjn414bI0JjuCgqR7f63m1nQEfHia0V5RxjkmEetkL5XCl8brX7v/VAiJev5RRvWJAxSYwtR5UjjEVx9TSte9eKJbvhghAEMIrjzn+3P1hBY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725570975; c=relaxed/simple; bh=8yDjUN3v9pzHbAJkU962KdEeNCXYhTKg/kSM+xczGS8=; h=From:Subject:Date:Message-Id:MIME-Version:Content-Type:To:Cc; b=seaDX4YB/1amTVErdQqkTGuvyU5b6SkuOXTPd87Xn0Lq2He+RZMa8ep3PLJA/xZSoGYLppleaqpp9+WXslC9eM0KIdSqUaNDz6QH+eVw5hIFN94+k2Mjy+qLJsTHlXmNj8KKOGHA7RiKQDG/9juZKAIbxEtU36XM0H6nRrbPwnw= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com; spf=pass smtp.mailfrom=rivosinc.com; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b=kisrC/mL; arc=none smtp.client-ip=209.85.210.50 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=rivosinc.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=rivosinc-com.20230601.gappssmtp.com header.i=@rivosinc-com.20230601.gappssmtp.com header.b="kisrC/mL" Received: by mail-ot1-f50.google.com with SMTP id 46e09a7af769-70f6732a16dso956861a34.3 for ; Thu, 05 Sep 2024 14:16:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20230601.gappssmtp.com; s=20230601; t=1725570972; x=1726175772; darn=vger.kernel.org; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:from:to:cc:subject:date:message-id:reply-to; bh=h1RxVlhkB8p72E7vZJvb+Ijp4614DvwE9gm+Vso2ack=; b=kisrC/mLw8lCuh+JqTNjjJfT6h8MChHgSDHURlVJv6zqSLvr0wnUh2olY1J7IFPTRZ mYjOuPrTSw8eBSxh0w++i796jR7psU0xiJQkIlAtaZfsyTwx6cKFQjwC6uK9piL1cOor eWyGroGze34kMNcIUf9RDnCN/e0/J+0Slg/ALhMfCnq1Ony4Pr2XSL4Ji8dxHOu/fdgT Y7OOYzJfft1zSejnVHCp/cMltWBNTxsFKg1qaF9jmHV/336hF/d7SWqMnRjpdPKjApQ/ mkT9/IpfvN4oVQvjRiEfzWfE6tkk5+iN9JVaGu+IN6d2aEbts4ltBYj4nXrulr5JT/88 +IMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1725570972; x=1726175772; h=cc:to:content-transfer-encoding:mime-version:message-id:date :subject:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=h1RxVlhkB8p72E7vZJvb+Ijp4614DvwE9gm+Vso2ack=; b=BaE/XRjH5DLAJ7b+I1SSZ7LQeV61+k35SQxbqhFDCW3OHbv7YugdG8iY8rd/gBqyPY Q08IDrc0s6DXYEot7RDUD3q5a9MNDxOijxCyQuRo7jk0YQ0uxp5cls2WSkRuKwB3nHnE 8e7E3AfqLHTMVe2d0/vXFPoVDplWxtUyXf0FZsEHbG/ubtDrUyvAwf2wUnbvKymcWNa1 QHxibj/RUnP+JL/PuqRIjeqXqexpJP3bHFUh2eXy+mlt3oPZlbxRL57F183ufpf75QtS RTlNN66RaVlAZdfZR1OW8O7u9AxCiRGr8nFGfA4M+OS4mbPwo47YwPfX3Z02THvnGU/E 4Y/Q== X-Forwarded-Encrypted: i=1; AJvYcCWXTL4NzQO2q+FwZqpbzSvKJziWVb8tik8tAK8HkVAR7y0jCglY/EZGfqsI4jPMWxwsK8m/7uhkmg==@vger.kernel.org X-Gm-Message-State: AOJu0YxyqwNnSuhK72rC1u2FZy8uTehTPdHWIXvTknA3Jp7rGTsXz/4a JMrKKydCXwAq0j5tt92XkHMgxCt35zQkox/GNhCdFkbfkqn8/c/ITjOqavYfQ9Y= X-Google-Smtp-Source: AGHT+IFUGglg1gI40db05Oyw57X6jum9/dYSwirPMN5y+AFduyw81mLgzW8++XC4iGt5jarfSGqHMg== X-Received: by 2002:a05:6358:4709:b0:1b8:3498:5ab2 with SMTP id e5c5f4694b2df-1b8386e10e6mr71603755d.18.1725570972065; Thu, 05 Sep 2024 14:16:12 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7d4fbda7abesm3775746a12.61.2024.09.05.14.16.08 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Sep 2024 14:16:11 -0700 (PDT) From: Charlie Jenkins Subject: [PATCH RFC v3 0/2] mm: Introduce ADDR_LIMIT_47BIT personality flag Date: Thu, 05 Sep 2024 14:15:50 -0700 Message-Id: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> Precedence: bulk X-Mailing-List: linux-sh@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-B4-Tracking: v=1; b=H4sIAIYf2mYC/4XNTQrCMBAF4KtI1kaS6b8rQfAAbkVKmk7NgG1KU qJSendDVyKIyzeP+d7MPDpCz/abmTkM5MkOMSTbDdNGDTfk1MbMQEAqSij4qCZt0PMG7/ZRGxq muu/VyBuZtEWlUOosY/F7dNjRc5Uv7Hw6sms8GvKTda91Lci1+gsHyQVP864DbCoB0B4cBetp0 Dtt+5UN8ElVvymIVJ6UCsq2QoXii1qW5Q0BYjuXEQEAAA== To: Arnd Bergmann , Richard Henderson , Ivan Kokshaysky , Matt Turner , Vineet Gupta , Russell King , Guo Ren , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Shuah Khan , Christoph Hellwig , Michal Hocko , "Kirill A. Shutemov" , Chris Torek Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-abi-devel@lists.sourceforge.net, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5488; i=charlie@rivosinc.com; h=from:subject:message-id; bh=8yDjUN3v9pzHbAJkU962KdEeNCXYhTKg/kSM+xczGS8=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ9ot+f6nvpcl97tY5XM5HRGwunrS/1hN4Jrc4J63aWdPl kkz5fzoKGVhEONgkBVTZOG51sDceke/7Kho2QSYOaxMIEMYuDgFYCIbvBgZfjQZPtnyo0T8l+3r pTc0r/6LOCzwZu3XBXX7mfYvU6k4cI2R4YF4V0iLZoGQYvmDbN1ZIvanHjMsmvbgwI2pnto/ozc e4gMA X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 Some applications rely on placing data in free bits addresses allocated by mmap. Various architectures (eg. x86, arm64, powerpc) restrict the address returned by mmap to be less than the 48-bit address space, unless the hint address uses more than 47 bits (the 48th bit is reserved for the kernel address space). The riscv architecture needs a way to similarly restrict the virtual address space. On the riscv port of OpenJDK an error is thrown if attempted to run on the 57-bit address space, called sv57 [1]. golang has a comment that sv57 support is not complete, but there are some workarounds to get it to mostly work [2]. These applications work on x86 because x86 does an implicit 47-bit restriction of mmap() address that contain a hint address that is less than 48 bits. Instead of implicitly restricting the address space on riscv (or any current/future architecture), provide a flag to the personality syscall that can be used to ensure an application works in any arbitrary VA space. A similar feature has already been implemented by the personality syscall in ADDR_LIMIT_32BIT. This flag will also allow seemless compatibility between all architectures, so applications like Go and OpenJDK that use bits in a virtual address can request the exact number of bits they need in a generic way. The flag can be checked inside of vm_unmapped_area() so that this flag does not have to be handled individually by each architecture. Link: https://github.com/openjdk/jdk/blob/f080b4bb8a75284db1b6037f8c00ef3b1ef1add1/src/hotspot/cpu/riscv/vm_version_riscv.cpp#L79 [1] Link: https://github.com/golang/go/blob/9e8ea567c838574a0f14538c0bbbd83c3215aa55/src/runtime/tagptr_64bit.go#L47 [2] To: Arnd Bergmann To: Richard Henderson To: Ivan Kokshaysky To: Matt Turner To: Vineet Gupta To: Russell King To: Guo Ren To: Huacai Chen To: WANG Xuerui To: Thomas Bogendoerfer To: James E.J. Bottomley To: Helge Deller To: Michael Ellerman To: Nicholas Piggin To: Christophe Leroy To: Naveen N Rao To: Alexander Gordeev To: Gerald Schaefer To: Heiko Carstens To: Vasily Gorbik To: Christian Borntraeger To: Sven Schnelle To: Yoshinori Sato To: Rich Felker To: John Paul Adrian Glaubitz To: David S. Miller To: Andreas Larsson To: Thomas Gleixner To: Ingo Molnar To: Borislav Petkov To: Dave Hansen To: x86@kernel.org To: H. Peter Anvin To: Andy Lutomirski To: Peter Zijlstra To: Muchun Song To: Andrew Morton To: Liam R. Howlett To: Vlastimil Babka To: Lorenzo Stoakes To: Shuah Khan To: Christoph Hellwig To: Michal Hocko To: "Kirill A. Shutemov" To: Chris Torek Cc: linux-arch@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-alpha@vger.kernel.org Cc: linux-snps-arc@lists.infradead.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-csky@vger.kernel.org Cc: loongarch@lists.linux.dev Cc: linux-mips@vger.kernel.org Cc: linux-parisc@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: linux-s390@vger.kernel.org Cc: linux-sh@vger.kernel.org Cc: sparclinux@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-kselftest@vger.kernel.org Cc: linux-abi-devel@lists.sourceforge.net Signed-off-by: Charlie Jenkins Changes in v2: - Added much greater detail to cover letter - Removed all code that touched architecture specific code and was able to factor this out into all generic functions, except for flags that needed to be added to vm_unmapped_area_info - Made this an RFC since I have only tested it on riscv and x86 - Link to v1: https://lore.kernel.org/r/20240827-patches-below_hint_mmap-v1-0-46ff2eb9022d@rivosinc.com Changes in v3: - Use a personality flag instead of an mmap flag - Link to v2: https://lore.kernel.org/r/20240829-patches-below_hint_mmap-v2-0-638a28d9eae0@rivosinc.com Acked-by: Guo Ren Tested-by: Jiaxun Yang --- Charlie Jenkins (2): mm: Add personality flag to limit address to 47 bits selftests/mm: Create ADDR_LIMIT_47BIT test include/uapi/linux/personality.h | 1 + mm/mmap.c | 3 ++ tools/testing/selftests/mm/.gitignore | 1 + tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/map_47bit_personality.c | 34 ++++++++++++++++++++++ 5 files changed, 40 insertions(+) --- base-commit: 5be63fc19fcaa4c236b307420483578a56986a37 change-id: 20240827-patches-below_hint_mmap-b13d79ae1c55