From patchwork Wed Jul 26 16:45:54 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 13328359 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5B634C001DC for ; Wed, 26 Jul 2023 16:46:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230256AbjGZQqe (ORCPT ); Wed, 26 Jul 2023 12:46:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33222 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230404AbjGZQqd (ORCPT ); Wed, 26 Jul 2023 12:46:33 -0400 Received: from mail-pl1-x636.google.com (mail-pl1-x636.google.com [IPv6:2607:f8b0:4864:20::636]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1CA6A270B for ; Wed, 26 Jul 2023 09:46:30 -0700 (PDT) Received: by mail-pl1-x636.google.com with SMTP id d9443c01a7336-1bb2468257fso38365425ad.0 for ; Wed, 26 Jul 2023 09:46:30 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1690389989; x=1690994789; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=taA43ETpLC9XelDxU6ZtNji2uVvqZo51XsvT9ZpAUOw=; b=VZu9MJSwZY921d+CgkyRoxwMZ9iNSRGcNwXdvnISwMB6ZrvGY+S7PdYNnCTN09Ml// 9OT/zZSv24aoMTT4p8YMqfNMaKALTuecJg7AAfyMvLYvUtCBWMHD8HmcPWG3A6DhHADY 9zndIIv6HUn5DPGDsaK9svaN+56XhvqriI612ahHA8eL4BMQerz9GE7C7DWqrlrqyhrD 2oFORFcvVABTahHZpXH/yATcrYwkLWjanAhlDeD98fff8tZGesgkvYndd+KcVx+PyB7n x3UZ7zYxPGWO/u8h37KPbndip2DXWlV/eE+HdzkbisNcgPAZzhTJsRw9oxmYcPU+eeIu 4kFA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1690389989; x=1690994789; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=taA43ETpLC9XelDxU6ZtNji2uVvqZo51XsvT9ZpAUOw=; b=aC7WpYLPQrqASLroLs9itme1WQT2YKdB4PlBkTCTCvs9adsqFudr9CEYGXWXbS1mEm XHsunCHa/UabYIq8NAPu07B+sPGBJXiHJ1yIDybmJC8MXjH0saYLfaHaBvay6nQ86nEq QinCqgmsBUEqidCkVuikmwv+dx/5gPO0K7vWtaD3sDzZgMdX+xaCPEjNeq8yzEAXbhwc uBWuPzD0kmwqw0K7Q8Ig7ihiVhC79LcJU1s5UBdFw49RAJMc03QBWBjAio/nZvqFdzR9 FUvo0gXR8cvW7XZwsza2eFZzYqpY/53tqrmRtC7pxDF6JdcvdltYA9LcDlj+L1eTVTIu wRUg== X-Gm-Message-State: ABy/qLa4MsDWxU9hxchkfkMe30J4yAgq2XsWAJBAo6eA3gNN4Z0zXWQK V+Av3QGdfdsrjbOp4ciMJ8egeQ== X-Google-Smtp-Source: APBJJlH6j0Ww1otYztDyN7R8yPQEX4DMdjE4EaTSbvjzsuEj6+yeD2BZI9v3UPAjEZlsbhq1mBWpeg== X-Received: by 2002:a17:903:2308:b0:1b8:aef2:773e with SMTP id d8-20020a170903230800b001b8aef2773emr2582222plh.46.1690389989599; Wed, 26 Jul 2023 09:46:29 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id h5-20020a170902f54500b001bb6c5ff4edsm11628870plf.173.2023.07.26.09.46.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 26 Jul 2023 09:46:29 -0700 (PDT) From: Charlie Jenkins To: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Cc: charlie@rivosinc.com, conor@kernel.org, paul.walmsley@sifive.com, palmer@rivosinc.com, aou@eecs.berkeley.edu, anup@brainfault.org, konstantin@linuxfoundation.org, linux-doc@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org, mick@ics.forth.gr, jrtc27@jrtc27.com, rdunlap@infradead.org, alexghiti@rivosinc.com Subject: [PATCH v7 0/4] RISC-V: mm: Make SV48 the default address space Date: Wed, 26 Jul 2023 09:45:54 -0700 Message-ID: <20230726164620.717288-1-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-kselftest@vger.kernel.org Make sv48 the default address space for mmap as some applications currently depend on this assumption. Users can now select a desired address space using a non-zero hint address to mmap. Previously, requesting the default address space from mmap by passing zero as the hint address would result in using the largest address space possible. Some applications depend on empty bits in the virtual address space, like Go and Java, so this patch provides more flexibility for application developers. -Charlie --- v7: - Changing RLIMIT_STACK inside of an executing program does not trigger arch_pick_mmap_layout(), so rewrite tests to change RLIMIT_STACK from a script before executing tests. RLIMIT_STACK of infinity forces bottomup mmap allocation. - Make arch_get_mmap_base macro more readible by extracting out the rnd calculation. - Use MMAP_MIN_VA_BITS in TASK_UNMAPPED_BASE to support case when mmap attempts to allocate address smaller than DEFAULT_MAP_WINDOW. - Fix incorrect wording in documentation. v6: - Rebase onto the correct base v5: - Minor wording change in documentation - Change some parenthesis in arch_get_mmap_ macros - Added case for addr==0 in arch_get_mmap_ because without this, programs would crash if RLIMIT_STACK was modified before executing the program. This was tested using the libhugetlbfs tests. v4: - Split testcases/document patch into test cases, in-code documentation, and formal documentation patches - Modified the mmap_base macro to be more legible and better represent memory layout - Fixed documentation to better reflect the implmentation - Renamed DEFAULT_VA_BITS to MMAP_VA_BITS - Added additional test case for rlimit changes --- Charlie Jenkins (4): RISC-V: mm: Restrict address space for sv39,sv48,sv57 RISC-V: mm: Add tests for RISC-V mm RISC-V: mm: Update pgtable comment documentation RISC-V: mm: Document mmap changes Documentation/riscv/vm-layout.rst | 22 +++++++ arch/riscv/include/asm/elf.h | 2 +- arch/riscv/include/asm/pgtable.h | 21 ++++-- arch/riscv/include/asm/processor.h | 47 ++++++++++++-- tools/testing/selftests/riscv/Makefile | 2 +- tools/testing/selftests/riscv/mm/.gitignore | 2 + tools/testing/selftests/riscv/mm/Makefile | 15 +++++ .../riscv/mm/testcases/mmap_bottomup.c | 35 ++++++++++ .../riscv/mm/testcases/mmap_default.c | 35 ++++++++++ .../selftests/riscv/mm/testcases/mmap_test.h | 64 +++++++++++++++++++ .../selftests/riscv/mm/testcases/run_mmap.sh | 12 ++++ 11 files changed, 244 insertions(+), 13 deletions(-) create mode 100644 tools/testing/selftests/riscv/mm/.gitignore create mode 100644 tools/testing/selftests/riscv/mm/Makefile create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap_bottomup.c create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap_default.c create mode 100644 tools/testing/selftests/riscv/mm/testcases/mmap_test.h create mode 100755 tools/testing/selftests/riscv/mm/testcases/run_mmap.sh