From mboxrd@z Thu Jan 1 00:00:00 1970 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 7B703C001DE for ; Fri, 14 Jul 2023 00:14:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229905AbjGNAOw (ORCPT ); Thu, 13 Jul 2023 20:14:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40476 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232372AbjGNAOw (ORCPT ); Thu, 13 Jul 2023 20:14:52 -0400 Received: from mail-pf1-x431.google.com (mail-pf1-x431.google.com [IPv6:2607:f8b0:4864:20::431]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D69592D45 for ; Thu, 13 Jul 2023 17:14:50 -0700 (PDT) Received: by mail-pf1-x431.google.com with SMTP id d2e1a72fcca58-66f5faba829so981534b3a.3 for ; Thu, 13 Jul 2023 17:14:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1689293690; x=1689898490; h=content-transfer-encoding:mime-version:message-id:date:subject:cc :to:from:from:to:cc:subject:date:message-id:reply-to; bh=7dKdw/fRpGMhPZx5yucAo2VmH/W0zeKNkjERAr97oOc=; b=DK487UlEpW2G5KFRjrV2Qfjy60Qn/3kFcFt39vvQNjsEy/EdjOhr/PmBjKDr5CA3ue oNYqCOjXL+TSPHDxeqvlWpse/XFj2PCH5gOs1+zKgSASKGaJaZdpuXaFcEcq8Rnz3g+y ts2DnoxMIPwZa5nAYgO2k12ohjijX+QJLCxmRGkoqm7IiF1YhtJDNVLQLoyjr/QWeryV sLBQARcgGMGbDvBPNh+ho4raziT+pePlPpswVWZYtwuJDXPVf3INeH9eVA7RV0TqGEU+ p+gBY6VSbMqvdZfHFgkT4xA+5jHK7jye8x+ul57+5ybnNDFunisuInIaNp+Xb9wIXcyi quGA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689293690; x=1689898490; 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=7dKdw/fRpGMhPZx5yucAo2VmH/W0zeKNkjERAr97oOc=; b=VFmt5W5LZ6urCyovmrLfv0Si7V0YyOe4kiczr8xH+bKYn2uEXr7c8gGpym05FaKqq/ 20KY4n2lYUnrkRjpYBq5u+P6KeH30Kma3jXXvsLk55dyi1t6MMtIi0dePM8cOeZ2DtW2 DW0D4liZYc3vIkDmnc32wiAP6k+B6vsxKGPtByM3ainA0/6OmDLd786yxe/CO1j6B7wG BWDSe+KVdYpafhpdOnfbTKQmmHSDxr2cEqJlmNDUSlRcZNmH+de+qdAoBalOh2hRFLac Kg3g5pQqAYoeHtS4obP2q15fPbqBC9bgl82w44p/ghdXAreNlglAsSpX3eWhDikMIqkx 3Qnw== X-Gm-Message-State: ABy/qLZ4DtLYHKmw2QQhab+5+Pp8zv2R3FGi9KU0XJlOdYMvnm1WDVHa LBWjHedKnPcy1TgdbA5/AmcYqw== X-Google-Smtp-Source: APBJJlGnN8YBws+YDNmDKckQ6/RCNHOhLy80mxzCgKrfd+QSmAYMBcKo9f0Tl8SPbx+/J+Wj39dEBQ== X-Received: by 2002:a05:6a20:394f:b0:12f:952:11ee with SMTP id r15-20020a056a20394f00b0012f095211eemr2554686pzg.43.1689293690271; Thu, 13 Jul 2023 17:14:50 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id x25-20020aa793b9000000b00673e652985esm5938107pff.44.2023.07.13.17.14.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 17:14:49 -0700 (PDT) From: Charlie Jenkins To: linux-kernel@vger.kernel.org, linux-riscv@lists.infradead.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 v5 0/4] RISC-V: mm: Make SV48 the default address space Date: Thu, 13 Jul 2023 17:13:59 -0700 Message-ID: <20230714001430.75798-1-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-doc@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 --- 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 -- 2.41.0