From patchwork Fri Jul 14 16:54:48 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 703455 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 B6645C001B0 for ; Fri, 14 Jul 2023 16:55:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236039AbjGNQz5 (ORCPT ); Fri, 14 Jul 2023 12:55:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34146 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235554AbjGNQz5 (ORCPT ); Fri, 14 Jul 2023 12:55:57 -0400 Received: from mail-pg1-x529.google.com (mail-pg1-x529.google.com [IPv6:2607:f8b0:4864:20::529]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AFE37358E for ; Fri, 14 Jul 2023 09:55:55 -0700 (PDT) Received: by mail-pg1-x529.google.com with SMTP id 41be03b00d2f7-55b0e7efb1cso1256827a12.1 for ; Fri, 14 Jul 2023 09:55:55 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1689353755; x=1689958555; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=u86Vccu0MjIpV1lk8gugdD4Hj3xwuyAB97KWj8HD83Y=; b=DcSFI3El+kQ7LUhr7I9CNLzPEPRrFlKiPN0ROzCgA+1cx5EXlSbbSIgcwQR813I1L+ 3uvoKmq2u01aQ1HX/F+kykKZKylNNs2J3TaYWmJfiC83cJEInBDz4UCDaT5YwZ28E5St H4SWKBVBsD2CZuKTjWB7EmNUDRNO0LJL6JSIOLpEXHgP2Y0TUROAagLq2gTnozEMMH92 2lDqhD+T+AR9CiYZ0dScRh/n98YBFJOdLfHH+j2EkhhSk32EX6cf10DVILFLv9++ETt4 wXVVrJ8jvwSLjrVIHuumet2G6Uj24MK9BtcXy0zdk2NFm15eYGcfgjfjwSJyXAwIkWWZ Nr3w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689353755; x=1689958555; 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=u86Vccu0MjIpV1lk8gugdD4Hj3xwuyAB97KWj8HD83Y=; b=DiGAxlHW7/nWeN9OZjjQ6QiY4s+Tjy6nPbs5pNL2UIEKcXlrONGTxb6J3GKGeXaF1I Fz2echUzVM/hfWbIf/BFKYnFulOJq276+Z5Ybzc332qSxF2Q1SLdOD5n8z/EtaZysFsZ YK6BLX3rRtmnT6/u9EYB0hG7HTYPXEXv214hCkiaRis945Ap5y5FWuAPDRcKYJUhkPzf kf7x/NOT5Nmmk2+LsqPtYDqNTLL3w5qt1F4oLFmPMMOdmLwcMrv9mLgIz9ptupid3zEH Wr6U8uH8fHeKlr8SpbzGUggP18n7WcrbZqIyzGHd9GshnvAl1IS1VqmQb46Zp4IBX4FE 9R0g== X-Gm-Message-State: ABy/qLaElSo0mxQId1buewwk9kQFpyzsiXO/gS5TajY+gKsRff0vVQzh YkQ/l1Tw7N4HiPIdViRfBYlJ9A== X-Google-Smtp-Source: APBJJlGGxbl6qGLIF7f2rYJjwvRaITLsmSOC7pkB9qZSGRIv+YlRfSsJaker/tHyOogKYwVG0JmwNg== X-Received: by 2002:a17:903:2288:b0:1b8:af85:e959 with SMTP id b8-20020a170903228800b001b8af85e959mr4250415plh.53.1689353755192; Fri, 14 Jul 2023 09:55:55 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id s8-20020a170902b18800b001b694140d96sm8008081plr.170.2023.07.14.09.55.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Jul 2023 09:55:54 -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 v6 0/4] RISC-V: mm: Make SV48 the default address space Date: Fri, 14 Jul 2023 09:54:48 -0700 Message-ID: <20230714165508.94561-1-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 --- 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 | 20 ++- arch/riscv/include/asm/processor.h | 46 +++++- tools/testing/selftests/riscv/Makefile | 2 +- tools/testing/selftests/riscv/mm/.gitignore | 1 + tools/testing/selftests/riscv/mm/Makefile | 21 +++ .../selftests/riscv/mm/testcases/mmap.c | 133 ++++++++++++++++++ 8 files changed, 234 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.c