From patchwork Wed Aug 9 23:22:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 133639 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b824:0:b0:3f2:4152:657d with SMTP id z4csp104918vqi; Wed, 9 Aug 2023 17:59:52 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFo17oGgSe1PmEzqXzmHTasvOfS1hlEyZQ65pdMrL0/jZRk89z9y11bwa/pJoYa+78zqDY2 X-Received: by 2002:a2e:9857:0:b0:2b8:3ff3:cd93 with SMTP id e23-20020a2e9857000000b002b83ff3cd93mr707959ljj.7.1691629192289; Wed, 09 Aug 2023 17:59:52 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1691629192; cv=none; d=google.com; s=arc-20160816; b=tumO0pXp74oW9/uissXP4NXh01hpypPxp25npwOMdna9QMFo610OwdkQpeMBr/Io5X tre7B77y2MWETPrvytZd4eNwDmezd63NlcUMd3ZfbaXmjIUXTsQR0j9iiEeWVOxmtxs5 kXj8idJ6dMlRqs+V9ZjAzdrqAZuIIG5b+NTpFB6zLoF14yMVGKnD9iyiWaagJpy08IyL Jgt6TiXRUKnBsKvqvHSlgEdP6Gb0S5noKQi/5U/SP1Ph2u5WY2a0DavZG1vg1cFVAC4p 4UVaoA2iMXzc28RsyOzQPJg9mlw0wGJH4PINu6F8rM02l9ORsFJnBjKTegxNkrBDtTTG ir7g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=BmBbsdQ/RomBbwS1vxZnTkZx2Et0MhurExBgxgdCP1I=; fh=7AUu9WDHec3ojD+PBWP8kj3GITT/pOnwiCBaYopXpyU=; b=ng1W/gh2APqMUuRMBIW6t/uWWFwzHjAHj3gNyqc3W8R3lG+BZv4sM9a4xYQy/QR4q1 gKx8Y/OFx6ELpqnmdYUrwCnMhBygsiTj9V5kUBA53/g8MsOIda2HpROgs/Kpgu/x1r0L hzyzik1O+iRCCzvVyFUboDRpfcx0UVPgamS9AC7M45YHWFBTj6o4ah1MDj4tLJo09s3f Ho3ynJxKK9cm0/0uB8oxT1HBkctX4RALfhl8lWAfiHkyK5fQvmrf/i+J6iYE/Q5E2wZk EbgJ1OKjK8In1OmJkXSzI4TbVuXXn0XXI4Nrz5gAGv59LJrqn+yymabfoB7Pm0Af9Arc Q/LA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=2+bjYsQu; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id w10-20020a17090652ca00b0099cac979982si375407ejn.1047.2023.08.09.17.59.28; Wed, 09 Aug 2023 17:59:52 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=2+bjYsQu; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231825AbjHIXY0 (ORCPT + 99 others); Wed, 9 Aug 2023 19:24:26 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45850 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229583AbjHIXYY (ORCPT ); Wed, 9 Aug 2023 19:24:24 -0400 Received: from mail-pl1-x632.google.com (mail-pl1-x632.google.com [IPv6:2607:f8b0:4864:20::632]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3E83D170F for ; Wed, 9 Aug 2023 16:24:23 -0700 (PDT) Received: by mail-pl1-x632.google.com with SMTP id d9443c01a7336-1bb7b8390e8so3326995ad.2 for ; Wed, 09 Aug 2023 16:24:23 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1691623463; x=1692228263; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=BmBbsdQ/RomBbwS1vxZnTkZx2Et0MhurExBgxgdCP1I=; b=2+bjYsQuCuir4dXzfsoxd+f2uLvMo+55BujM3RV74p9qc01puICn3suYXl9PdG27HR 6MlZXk8AAnRoaiKJL13ccMX1uf4QKbGt8Hh/bNm1YesgqMS51G0b/8fzdP9eA6NrA/1l rFgvFkJHzxu987W8DljvJYRi+n62AtZKjSJtheuMQvxpOPwMUgtQG8AF8UHYaoGKbmNX HUgJPK3bCetz7V1Yo7dT3SuJINERzhRHFq5fuSJUqF49V90xFMKgXrCbZNMkE42mVKF0 h+9/V8lzU/iPyiDJ2uY3OxrgT6eQp95NvTdYAGOmf4wohaiXftvKIMkcBpUDdiaSQh8P rrVQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691623463; x=1692228263; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=BmBbsdQ/RomBbwS1vxZnTkZx2Et0MhurExBgxgdCP1I=; b=Dh1DtgBx1/LDYqzSJ7TslRxz5TpDMZS0pLhi8u/feT2X+v1bbqMXbvYQj1psoQVgfj JX+1DiLkH6peLXYUTFMmf+bJLeyQLOtTVuplMITRZ4uzoHbDmO27VOkDjENEBoTxo9X2 C6Y9LBKm0AuhZXj6iVl5OwJTkQ7EQpSu3qU1U0q4c231ZzZBD1D4381B7Jw9XCGidY3Z tmGSP0NFeNuu53gguj6sxVo+CEFwWshKD8+Ilt2JGVbWN+0lJ6MA+2xYhvThuf5NqzHr Wqr4PAFFhmFc4SsH/96tdK691Z1+wGfjNx22OhTfcHlLPgYn0eKuRs+UYJWVtOF2EtxN qs2Q== X-Gm-Message-State: AOJu0YwIrh6aw1v4iBwtNs52hH62PTlH7zuLqQU2oltuj/xGsxpDI4M9 gxuaiF63dqjogydQHIbUV/FOJg== X-Received: by 2002:a17:902:db06:b0:1bc:506a:58f2 with SMTP id m6-20020a170902db0600b001bc506a58f2mr632035plx.46.1691623462666; Wed, 09 Aug 2023 16:24:22 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id l18-20020a170902d35200b001b54d064a4bsm82765plk.259.2023.08.09.16.24.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Aug 2023 16:24:22 -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 v10 1/4] RISC-V: mm: Restrict address space for sv39,sv48,sv57 Date: Wed, 9 Aug 2023 16:22:01 -0700 Message-ID: <20230809232218.849726-2-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809232218.849726-1-charlie@rivosinc.com> References: <20230809232218.849726-1-charlie@rivosinc.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773801772138944495 X-GMAIL-MSGID: 1773801772138944495 Make sv48 the default address space for mmap as some applications currently depend on this assumption. A hint address passed to mmap will cause the largest address space that fits entirely into the hint to be used. If the hint is less than or equal to 1<<38, an sv39 address will be used. An exception is that if the hint address is 0, then a sv48 address will be used. After an address space is completely full, the next smallest address space will be used. Signed-off-by: Charlie Jenkins --- arch/riscv/include/asm/elf.h | 2 +- arch/riscv/include/asm/pgtable.h | 25 ++++++++++++-- arch/riscv/include/asm/processor.h | 52 ++++++++++++++++++++++++++---- 3 files changed, 70 insertions(+), 9 deletions(-) diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h index c24280774caf..5d3368d5585c 100644 --- a/arch/riscv/include/asm/elf.h +++ b/arch/riscv/include/asm/elf.h @@ -49,7 +49,7 @@ extern bool compat_elf_check_arch(Elf32_Ehdr *hdr); * the loader. We need to make sure that it is out of the way of the program * that it will "exec", and that there is sufficient room for the brk. */ -#define ELF_ET_DYN_BASE ((TASK_SIZE / 3) * 2) +#define ELF_ET_DYN_BASE ((DEFAULT_MAP_WINDOW / 3) * 2) #ifdef CONFIG_64BIT #ifdef CONFIG_COMPAT diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 75970ee2bda2..bb0b9ac7b581 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -62,11 +62,16 @@ * struct pages to map half the virtual address space. Then * position vmemmap directly below the VMALLOC region. */ +#define VA_BITS_SV32 32 #ifdef CONFIG_64BIT +#define VA_BITS_SV39 39 +#define VA_BITS_SV48 48 +#define VA_BITS_SV57 57 + #define VA_BITS (pgtable_l5_enabled ? \ - 57 : (pgtable_l4_enabled ? 48 : 39)) + VA_BITS_SV57 : (pgtable_l4_enabled ? VA_BITS_SV48 : VA_BITS_SV39)) #else -#define VA_BITS 32 +#define VA_BITS VA_BITS_SV32 #endif #define VMEMMAP_SHIFT \ @@ -111,11 +116,27 @@ #include #include #include +#include #define __page_val_to_pfn(_val) (((_val) & _PAGE_PFN_MASK) >> _PAGE_PFN_SHIFT) #ifdef CONFIG_64BIT #include + +#define VA_USER_SV39 (UL(1) << (VA_BITS_SV39 - 1)) +#define VA_USER_SV48 (UL(1) << (VA_BITS_SV48 - 1)) +#define VA_USER_SV57 (UL(1) << (VA_BITS_SV57 - 1)) + +#ifdef CONFIG_COMPAT +#define MMAP_VA_BITS_64 ((VA_BITS >= VA_BITS_SV48) ? VA_BITS_SV48 : VA_BITS) +#define MMAP_MIN_VA_BITS_64 (VA_BITS_SV39) +#define MMAP_VA_BITS (is_compat_task() ? VA_BITS_SV32 : MMAP_VA_BITS_64) +#define MMAP_MIN_VA_BITS (is_compat_task() ? VA_BITS_SV32 : MMAP_MIN_VA_BITS_64) +#else +#define MMAP_VA_BITS ((VA_BITS >= VA_BITS_SV48) ? VA_BITS_SV48 : VA_BITS) +#define MMAP_MIN_VA_BITS (VA_BITS_SV39) +#endif /* CONFIG_COMPAT */ + #else #include #endif /* CONFIG_64BIT */ diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h index c950a8d9edef..3e23e1786d05 100644 --- a/arch/riscv/include/asm/processor.h +++ b/arch/riscv/include/asm/processor.h @@ -13,19 +13,59 @@ #include +#ifdef CONFIG_64BIT +#define DEFAULT_MAP_WINDOW (UL(1) << (MMAP_VA_BITS - 1)) +#define STACK_TOP_MAX TASK_SIZE_64 + +#define arch_get_mmap_end(addr, len, flags) \ +({ \ + unsigned long mmap_end; \ + typeof(addr) _addr = (addr); \ + if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \ + mmap_end = STACK_TOP_MAX; \ + else if ((_addr) >= VA_USER_SV57) \ + mmap_end = STACK_TOP_MAX; \ + else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \ + mmap_end = VA_USER_SV48; \ + else \ + mmap_end = VA_USER_SV39; \ + mmap_end; \ +}) + +#define arch_get_mmap_base(addr, base) \ +({ \ + unsigned long mmap_base; \ + typeof(addr) _addr = (addr); \ + typeof(base) _base = (base); \ + unsigned long rnd_gap = DEFAULT_MAP_WINDOW - (_base); \ + if ((_addr) == 0 || (IS_ENABLED(CONFIG_COMPAT) && is_compat_task())) \ + mmap_base = (_base); \ + else if (((_addr) >= VA_USER_SV57) && (VA_BITS >= VA_BITS_SV57)) \ + mmap_base = VA_USER_SV57 - rnd_gap; \ + else if ((((_addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \ + mmap_base = VA_USER_SV48 - rnd_gap; \ + else \ + mmap_base = VA_USER_SV39 - rnd_gap; \ + mmap_base; \ +}) + +#else +#define DEFAULT_MAP_WINDOW TASK_SIZE +#define STACK_TOP_MAX TASK_SIZE +#endif +#define STACK_ALIGN 16 + +#define STACK_TOP DEFAULT_MAP_WINDOW + /* * This decides where the kernel will search for a free chunk of vm * space during mmap's. */ -#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) - -#define STACK_TOP TASK_SIZE #ifdef CONFIG_64BIT -#define STACK_TOP_MAX TASK_SIZE_64 +#define TASK_UNMAPPED_BASE PAGE_ALIGN((UL(1) << MMAP_MIN_VA_BITS) / 3) #else -#define STACK_TOP_MAX TASK_SIZE +#define TASK_UNMAPPED_BASE PAGE_ALIGN(TASK_SIZE / 3) #endif -#define STACK_ALIGN 16 #ifndef __ASSEMBLY__ From patchwork Wed Aug 9 23:22:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 133626 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b824:0:b0:3f2:4152:657d with SMTP id z4csp93389vqi; Wed, 9 Aug 2023 17:27:36 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGarcL6PkxIXIAXNkVwnG4495qtlHIAO9Y5L69JJFIOjK3mnAZoW8KZIAWVV9v112CvQsr2 X-Received: by 2002:a05:6402:31eb:b0:523:3609:d3ca with SMTP id dy11-20020a05640231eb00b005233609d3camr712962edb.20.1691627255924; Wed, 09 Aug 2023 17:27:35 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1691627255; cv=none; d=google.com; s=arc-20160816; b=Weww6U6vaAIVv0LA640eJ+4R8PbMtT88sucUk+a49F99ruKaPKD8W/lH05Dm+Z9End tnMDsQ/z0ugwrRKmjFBi86Wi7M8Gv3MN5JJrYVlD4nFOjlpBqZVXcqe5rUPBYIgXxO3I +6fSlwmOju2bIpkpk/HwAPU+cMw4Qd8wSIvd8HGeRbxygeCHYbubB4vHivyXfG9j4gh7 qpXxzVeuoZ5Rbo3zhxE/zBOkd/vu/BjtlvAgOzcLiLEcD6ewPNnyk6LaFq765NbQ7Pll 6iv4Etb5Mtsklvx2ldqKfyhgNLA8ngAKCGbz/nw4FtPJqlD3NyhR5re9Qc/lZG9DQyG0 JSbw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=IqoPeA6wKcuCb1RtSAVao8nNOFMZCDDFQoFYxZEN+6o=; fh=7AUu9WDHec3ojD+PBWP8kj3GITT/pOnwiCBaYopXpyU=; b=mcf82G0ab+C8tOU5jCUsjXqlKk85qVZaxwd489Jt/MHOtHsU9QR5fyx2K2uEI2lNwy LqoMbAHRSIiA5aCbw3HHtDZyciWxm11/PT03Wfs3WrovT1C4MmImZSVmhxFM/ro1t4tr YU75QGwt/NMtvDxcHwsHkza9zdPveqV9T7GmLEofjRrS50pzg5LD66F9lZoIXVpRVSwJ hmy43GKqFfzVzs5nze3CSbuZt1gsW/ujFQJNl4ZFqDvecjJYLUiEhxEB9YTCYtxrttta evaVvw6kwbhycuE8GUxIJGsWx9r/0cJ9Ap2wpyObPSp6kPKz/ai6rJGKktZQ9uvt/B7J CREw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=gm83jILU; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id c4-20020aa7c744000000b00521937ee981si264086eds.402.2023.08.09.17.27.10; Wed, 09 Aug 2023 17:27:35 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=gm83jILU; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232513AbjHIXYb (ORCPT + 99 others); Wed, 9 Aug 2023 19:24:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45916 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231935AbjHIXY3 (ORCPT ); Wed, 9 Aug 2023 19:24:29 -0400 Received: from mail-pl1-x62f.google.com (mail-pl1-x62f.google.com [IPv6:2607:f8b0:4864:20::62f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C834510E6 for ; Wed, 9 Aug 2023 16:24:24 -0700 (PDT) Received: by mail-pl1-x62f.google.com with SMTP id d9443c01a7336-1bc7e65ea44so2518385ad.1 for ; Wed, 09 Aug 2023 16:24:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1691623464; x=1692228264; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=IqoPeA6wKcuCb1RtSAVao8nNOFMZCDDFQoFYxZEN+6o=; b=gm83jILUNh6/zUoHxIyJIwVa+3RhunqO72lQbd7nCP8mXnRB6+Q8xAJWnBgKIxVv/Z xK5JgJo0QvTKYA7DYV/AHIrOZ1B5IbILi3JVN3JmDwfaP2D6wMjQlPAjGIWqhmKCPxHi PxK3A+wH/hdiwJiOuTAivkS+xdvLEkANWyAJRr66/sAkUjh3MLlNgn0m5W0nG7o6OBjQ luhey6ythegI/26xUwHqziHB5B2ze0H/YpU4ElAtp4496rPsdLsI1CozqbhwHtNFSo8O P3p726zTROCmGKUUDst8emxPfWRQsLv5dRQ8HWgZZFM2zUtJ0TmIcnWUOoOKiXjhnXHV rYZg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691623464; x=1692228264; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=IqoPeA6wKcuCb1RtSAVao8nNOFMZCDDFQoFYxZEN+6o=; b=i9353zK0hQyHcaI8aYTnX91WkvWz3P/BKXV/omC581IL6iC/2vn+xDSaVMPqkVzIQG LJsjJpT78sFo/4yxhXvi9F7cZ5VuY85alaHh0DTLtQSnu7qC25xVeHfQ9iyOMXjHFgTW gwmfPrimPaj9Q5OHMr+nPgoDk/yVBH5LBZJOtkC+6qTa80AgAVxxTcZkykfrAg4zE1fg Jhrq4Mu+SRF7EuxWD9+vewxFh7Tqc9EiNkSFtJCeUy9pAbvcdkahfaX9HXBmGJpOKf12 LBa9bF9YFN1wB34QocTb9EMfd8U7CsGiKRNbj5oBNbAtwtFaCvma+gjmh/3xkDS558x1 f9EQ== X-Gm-Message-State: AOJu0YxuMDVQl/PptZjYY07G3rcFID93RaGYB9PxLJhYWjoJiEw2RZpy iIWHbPv5+n5MpoWj2XbO2bVcHg== X-Received: by 2002:a17:902:c101:b0:1b6:9954:2030 with SMTP id 1-20020a170902c10100b001b699542030mr458836pli.8.1691623464252; Wed, 09 Aug 2023 16:24:24 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id l18-20020a170902d35200b001b54d064a4bsm82765plk.259.2023.08.09.16.24.22 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Aug 2023 16:24:23 -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 v10 2/4] RISC-V: mm: Add tests for RISC-V mm Date: Wed, 9 Aug 2023 16:22:02 -0700 Message-ID: <20230809232218.849726-3-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809232218.849726-1-charlie@rivosinc.com> References: <20230809232218.849726-1-charlie@rivosinc.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773799741579396214 X-GMAIL-MSGID: 1773799741579396214 Add tests that enforce mmap hint address behavior. mmap should default to sv48. mmap will provide an address at the highest address space that can fit into the hint address, unless the hint address is less than sv39 and not 0, then it will return a sv39 address. These tests are split into two files: mmap_default.c and mmap_bottomup.c because a new process must be exec'd in order to change the mmap layout. The run_mmap.sh script sets the stack to be unlimited for the mmap_bottomup.c test which triggers a bottomup layout. Signed-off-by: Charlie Jenkins --- 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 ++++ 7 files changed, 164 insertions(+), 1 deletion(-) 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 diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile index f4b3d5c9af5b..4a9ff515a3a0 100644 --- a/tools/testing/selftests/riscv/Makefile +++ b/tools/testing/selftests/riscv/Makefile @@ -5,7 +5,7 @@ ARCH ?= $(shell uname -m 2>/dev/null || echo not) ifneq (,$(filter $(ARCH),riscv)) -RISCV_SUBTARGETS ?= hwprobe vector +RISCV_SUBTARGETS ?= hwprobe vector mm else RISCV_SUBTARGETS := endif diff --git a/tools/testing/selftests/riscv/mm/.gitignore b/tools/testing/selftests/riscv/mm/.gitignore new file mode 100644 index 000000000000..5c2c57cb950c --- /dev/null +++ b/tools/testing/selftests/riscv/mm/.gitignore @@ -0,0 +1,2 @@ +mmap_bottomup +mmap_default diff --git a/tools/testing/selftests/riscv/mm/Makefile b/tools/testing/selftests/riscv/mm/Makefile new file mode 100644 index 000000000000..11e0f0568923 --- /dev/null +++ b/tools/testing/selftests/riscv/mm/Makefile @@ -0,0 +1,15 @@ +# SPDX-License-Identifier: GPL-2.0 +# Copyright (C) 2021 ARM Limited +# Originally tools/testing/arm64/abi/Makefile + +# Additional include paths needed by kselftest.h and local headers +CFLAGS += -D_GNU_SOURCE -std=gnu99 -I. + +TEST_GEN_FILES := testcases/mmap_default testcases/mmap_bottomup + +TEST_PROGS := testcases/run_mmap.sh + +include ../../lib.mk + +$(OUTPUT)/mm: testcases/mmap_default.c testcases/mmap_bottomup.c testcases/mmap_tests.h + $(CC) -o$@ $(CFLAGS) $(LDFLAGS) $^ diff --git a/tools/testing/selftests/riscv/mm/testcases/mmap_bottomup.c b/tools/testing/selftests/riscv/mm/testcases/mmap_bottomup.c new file mode 100644 index 000000000000..b29379f7e478 --- /dev/null +++ b/tools/testing/selftests/riscv/mm/testcases/mmap_bottomup.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include + +#include "../../kselftest_harness.h" + +TEST(infinite_rlimit) +{ +// Only works on 64 bit +#if __riscv_xlen == 64 + struct addresses mmap_addresses; + + EXPECT_EQ(BOTTOM_UP, memory_layout()); + + do_mmaps(&mmap_addresses); + + EXPECT_NE(MAP_FAILED, mmap_addresses.no_hint); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_37_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_38_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_46_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_47_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_55_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_56_addr); + + EXPECT_GT(1UL << 47, (unsigned long)mmap_addresses.no_hint); + EXPECT_GT(1UL << 38, (unsigned long)mmap_addresses.on_37_addr); + EXPECT_GT(1UL << 38, (unsigned long)mmap_addresses.on_38_addr); + EXPECT_GT(1UL << 38, (unsigned long)mmap_addresses.on_46_addr); + EXPECT_GT(1UL << 47, (unsigned long)mmap_addresses.on_47_addr); + EXPECT_GT(1UL << 47, (unsigned long)mmap_addresses.on_55_addr); + EXPECT_GT(1UL << 56, (unsigned long)mmap_addresses.on_56_addr); +#endif +} + +TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/riscv/mm/testcases/mmap_default.c b/tools/testing/selftests/riscv/mm/testcases/mmap_default.c new file mode 100644 index 000000000000..d1accb91b726 --- /dev/null +++ b/tools/testing/selftests/riscv/mm/testcases/mmap_default.c @@ -0,0 +1,35 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include + +#include "../../kselftest_harness.h" + +TEST(default_rlimit) +{ +// Only works on 64 bit +#if __riscv_xlen == 64 + struct addresses mmap_addresses; + + EXPECT_EQ(TOP_DOWN, memory_layout()); + + do_mmaps(&mmap_addresses); + + EXPECT_NE(MAP_FAILED, mmap_addresses.no_hint); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_37_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_38_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_46_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_47_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_55_addr); + EXPECT_NE(MAP_FAILED, mmap_addresses.on_56_addr); + + EXPECT_GT(1UL << 47, (unsigned long)mmap_addresses.no_hint); + EXPECT_GT(1UL << 38, (unsigned long)mmap_addresses.on_37_addr); + EXPECT_GT(1UL << 38, (unsigned long)mmap_addresses.on_38_addr); + EXPECT_GT(1UL << 38, (unsigned long)mmap_addresses.on_46_addr); + EXPECT_GT(1UL << 47, (unsigned long)mmap_addresses.on_47_addr); + EXPECT_GT(1UL << 47, (unsigned long)mmap_addresses.on_55_addr); + EXPECT_GT(1UL << 56, (unsigned long)mmap_addresses.on_56_addr); +#endif +} + +TEST_HARNESS_MAIN diff --git a/tools/testing/selftests/riscv/mm/testcases/mmap_test.h b/tools/testing/selftests/riscv/mm/testcases/mmap_test.h new file mode 100644 index 000000000000..9b8434f62f57 --- /dev/null +++ b/tools/testing/selftests/riscv/mm/testcases/mmap_test.h @@ -0,0 +1,64 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +#ifndef _TESTCASES_MMAP_TEST_H +#define _TESTCASES_MMAP_TEST_H +#include +#include +#include + +#define TOP_DOWN 0 +#define BOTTOM_UP 1 + +struct addresses { + int *no_hint; + int *on_37_addr; + int *on_38_addr; + int *on_46_addr; + int *on_47_addr; + int *on_55_addr; + int *on_56_addr; +}; + +static inline void do_mmaps(struct addresses *mmap_addresses) +{ + /* + * Place all of the hint addresses on the boundaries of mmap + * sv39, sv48, sv57 + * User addresses end at 1<<38, 1<<47, 1<<56 respectively + */ + void *on_37_bits = (void *)(1UL << 37); + void *on_38_bits = (void *)(1UL << 38); + void *on_46_bits = (void *)(1UL << 46); + void *on_47_bits = (void *)(1UL << 47); + void *on_55_bits = (void *)(1UL << 55); + void *on_56_bits = (void *)(1UL << 56); + + int prot = PROT_READ | PROT_WRITE; + int flags = MAP_PRIVATE | MAP_ANONYMOUS; + + mmap_addresses->no_hint = + mmap(NULL, 5 * sizeof(int), prot, flags, 0, 0); + mmap_addresses->on_37_addr = + mmap(on_37_bits, 5 * sizeof(int), prot, flags, 0, 0); + mmap_addresses->on_38_addr = + mmap(on_38_bits, 5 * sizeof(int), prot, flags, 0, 0); + mmap_addresses->on_46_addr = + mmap(on_46_bits, 5 * sizeof(int), prot, flags, 0, 0); + mmap_addresses->on_47_addr = + mmap(on_47_bits, 5 * sizeof(int), prot, flags, 0, 0); + mmap_addresses->on_55_addr = + mmap(on_55_bits, 5 * sizeof(int), prot, flags, 0, 0); + mmap_addresses->on_56_addr = + mmap(on_56_bits, 5 * sizeof(int), prot, flags, 0, 0); +} + +static inline int memory_layout(void) +{ + int prot = PROT_READ | PROT_WRITE; + int flags = MAP_PRIVATE | MAP_ANONYMOUS; + + void *value1 = mmap(NULL, sizeof(int), prot, flags, 0, 0); + void *value2 = mmap(NULL, sizeof(int), prot, flags, 0, 0); + + return value2 > value1; +} +#endif /* _TESTCASES_MMAP_TEST_H */ diff --git a/tools/testing/selftests/riscv/mm/testcases/run_mmap.sh b/tools/testing/selftests/riscv/mm/testcases/run_mmap.sh new file mode 100755 index 000000000000..ca5ad7c48bad --- /dev/null +++ b/tools/testing/selftests/riscv/mm/testcases/run_mmap.sh @@ -0,0 +1,12 @@ +#!/bin/sh +# SPDX-License-Identifier: GPL-2.0 + +original_stack_limit=$(ulimit -s) + +./mmap_default + +# Force mmap_bottomup to be ran with bottomup memory due to +# the unlimited stack +ulimit -s unlimited +./mmap_bottomup +ulimit -s $original_stack_limit From patchwork Wed Aug 9 23:22:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 133673 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b824:0:b0:3f2:4152:657d with SMTP id z4csp157753vqi; Wed, 9 Aug 2023 20:29:49 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGbIJQqkDgMH3sF7tuJnl+k1ad5nOTx6soN1UVQ7cPE0sV/n7U8pG8Gezq/A/4BTq+utslb X-Received: by 2002:a9d:6c52:0:b0:6bd:708:c1f2 with SMTP id g18-20020a9d6c52000000b006bd0708c1f2mr1111589otq.14.1691638189401; Wed, 09 Aug 2023 20:29:49 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1691638189; cv=none; d=google.com; s=arc-20160816; b=hb5pmHGUKy3HvpDTHK5Zv2iT9W2p6cV530OPjhsN7RV+jYaEudLBHIE7xckRt2rB3q EyQ6dqh/QWIXu60nqMgU+lucDEN82PBXGecwE8BZomo7JqvtL+jlhaL3NbZDha8fFlOE lSfDUDQVEfDwiv9F3dojdOPMP3Y4NKjinJMJF9Mk56dT2smhapPuJ7KeaS7nI7kPgGJv m8kgv0Uove+HOh3NpztNmUSHAiXQaLFlaFpkjIB17by190bofQni+nydLyqzFBRGpys7 QQ5cEQSHu5rf/ShsshYe0gUxHy8TP5BDkjfEOFlI+anajD/NjrlCQ+HV0r+qsPwwerr7 eHIg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=yZ0IVnzj5yL9SoUKLkLsC9JEkQ8y1OJuZ3kbIa3etj8=; fh=7AUu9WDHec3ojD+PBWP8kj3GITT/pOnwiCBaYopXpyU=; b=CFSRgtkXbOM0FR5brznywMZs+FyKlNFkh3zLZ7G7OKhfB+zde7hBLKyNffFsUzZykn 4/h1MJJcFRZ3FIpraWfAcTKEk43/aMVA0ZemXMvn3RxTetbJRK+bS5AR6PamrJgUomBr Gxxgjk2F78Y+7tkgK9hqiSiDHSVmlCHtVoIFj/facJ90SAGQ1DPOQweEr0namUy8D1xH jLlGlv148Ga+skUXuUrar8rPR1rdKksJXnuDCrSF3kezaVPXH4QGtpaBjsGl1IrEdrPW 4OcJZwSwZauHc3qM5jOSRwFE+HO71JXelB/XtIlOHX3uDdAPNCatyRT9wMvf/iyVPg9V MRFA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=DPqz69bv; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id x190-20020a6386c7000000b0056507c2502fsi671394pgd.236.2023.08.09.20.29.36; Wed, 09 Aug 2023 20:29:49 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=DPqz69bv; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232875AbjHIXYe (ORCPT + 99 others); Wed, 9 Aug 2023 19:24:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50110 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232257AbjHIXYa (ORCPT ); Wed, 9 Aug 2023 19:24:30 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1E53D1BCF for ; Wed, 9 Aug 2023 16:24:26 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id d9443c01a7336-1bbc64f9a91so3769895ad.0 for ; Wed, 09 Aug 2023 16:24:26 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1691623465; x=1692228265; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=yZ0IVnzj5yL9SoUKLkLsC9JEkQ8y1OJuZ3kbIa3etj8=; b=DPqz69bvmOi0drz5sANCyS+ejDOE4tK2aPT6CgqMeO23pKOSYzYTRtQqX2sUrjiJmC RrSZUkbRkQCVs7wzIENC1wePmX11ZnFj1kEpsCllQfjH8OdDSh+ynaBkruLDhKbxi/y7 hNKWT+H9FuM6BoaCv58BuAIhRmwJFzvP7uVm9tr4dtvvEe/YDApQvNm32rOzdMYd7vlm L6nJ3tcaqJbaF9pxp0H0xccKqzMXdCN5FaL8hF9CFS4XTf6Avl0vGc+i3JB23oEo+UYb B70BdpKfpKDQSAPKlmFJOXdwGmfAe0rv+GpuSvzqq6Fu2b/L19mwtUPiLUPiPFcaAgxf UibQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691623465; x=1692228265; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=yZ0IVnzj5yL9SoUKLkLsC9JEkQ8y1OJuZ3kbIa3etj8=; b=ZLqwa5IL2bXQhdw3tU0CttUybTVLrPiDfK9QongMrOi4KquqEqFtG4xAIxFbrLUl1n kMCg1qdugnclhYEvHRhk82JtKjTuJEgWOIG2Fh0Bjy5CAPVPzEzGyGmNw6VltYm0ns+x D4FXkqT3hpk1ptz4tT6U5gyfZ8mWRxugmoCL0c5RljGLdBK2h5wjU8JeVq7j/iNq3OpD 0y5PhYjoaIH83xn0ngIyicQab0hzdEFD19scibYmh01dSynUP1O+dqiqgAsfgnAZ9cWv q83p6u4l9w7i+XLOAawAWjIDXett4nDRhJzxeJo6YRZHmRtGOgIFZtEgbki7R+LdmuJn s6+Q== X-Gm-Message-State: AOJu0Yx77tDlv0BQf7AW/amiovthOO2+MEpkOLuz3FDXtLDkOII0vJeA G+X2PBJ6Sj6X1PDbO+ONjf+ykg== X-Received: by 2002:a17:903:110f:b0:1b8:b5f8:c485 with SMTP id n15-20020a170903110f00b001b8b5f8c485mr741164plh.50.1691623465574; Wed, 09 Aug 2023 16:24:25 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id l18-20020a170902d35200b001b54d064a4bsm82765plk.259.2023.08.09.16.24.24 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Aug 2023 16:24:25 -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 v10 3/4] RISC-V: mm: Update pgtable comment documentation Date: Wed, 9 Aug 2023 16:22:03 -0700 Message-ID: <20230809232218.849726-4-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809232218.849726-1-charlie@rivosinc.com> References: <20230809232218.849726-1-charlie@rivosinc.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773811205820388078 X-GMAIL-MSGID: 1773811205820388078 sv57 is supported in the kernel so pgtable.h should reflect that. Signed-off-by: Charlie Jenkins Reviewed-by: Alexandre Ghiti --- arch/riscv/include/asm/pgtable.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index bb0b9ac7b581..2c5f6c8edc8a 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -851,14 +851,16 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) * Task size is 0x4000000000 for RV64 or 0x9fc00000 for RV32. * Note that PGDIR_SIZE must evenly divide TASK_SIZE. * Task size is: - * - 0x9fc00000 (~2.5GB) for RV32. - * - 0x4000000000 ( 256GB) for RV64 using SV39 mmu - * - 0x800000000000 ( 128TB) for RV64 using SV48 mmu + * - 0x9fc00000 (~2.5GB) for RV32. + * - 0x4000000000 ( 256GB) for RV64 using SV39 mmu + * - 0x800000000000 ( 128TB) for RV64 using SV48 mmu + * - 0x100000000000000 ( 64PB) for RV64 using SV57 mmu * * Note that PGDIR_SIZE must evenly divide TASK_SIZE since "RISC-V * Instruction Set Manual Volume II: Privileged Architecture" states that * "load and store effective addresses, which are 64bits, must have bits * 63–48 all equal to bit 47, or else a page-fault exception will occur." + * Similarly for SV57, bits 63–57 must be equal to bit 56. */ #ifdef CONFIG_64BIT #define TASK_SIZE_64 (PGDIR_SIZE * PTRS_PER_PGD / 2) From patchwork Wed Aug 9 23:22:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 133632 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:b824:0:b0:3f2:4152:657d with SMTP id z4csp97820vqi; Wed, 9 Aug 2023 17:39:26 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEqJ2M563IBpLWITddrTTXgtfuuk7HZ5HlJU14jZKOpEAdb6m9DnNWlfIwqq6REEJHYSMyo X-Received: by 2002:a05:6808:1155:b0:3a7:53a8:aed2 with SMTP id u21-20020a056808115500b003a753a8aed2mr1291479oiu.7.1691627966065; Wed, 09 Aug 2023 17:39:26 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1691627966; cv=none; d=google.com; s=arc-20160816; b=QuvjV6cZXFYVBC4V3y+lwyFZBlj7Z+7wawU9bszCYADUWg1RcjIVvDLx0qtjYa0cZt D5T6Jkbof357kR1/11W/KRp25RtogNwaKLMVQn15gx3QtrEEVbmOs5g64roeqk27oLZQ P7MGxCCuinxCR7cbKQJDSqguKGlCEUcu3r5LiIa0L7WciTJ7fitnbWIclPWDa0QaBJUv B3Pb0FyXaj/D4oJssLvgvjEwAKEPZuHGWwo2yVrszFwL5CA2XKrneiYRxTqZJdKmgyGY BS8DJ2CXc18fEHTWRg+8/npUuLLyYTc83BtvmYjfwLlgvwuCHkC7sEQHaokJeNNYyZhw awlA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=2tar+fwRF9EwexnZBlGXBQ+bino7OPSUOa9FVKEDgW8=; fh=7AUu9WDHec3ojD+PBWP8kj3GITT/pOnwiCBaYopXpyU=; b=PVB1zyB4GBdadqGObvMG5QPUxs+kbpvqyETcSIvU6lVmhQ6nHVbezSDbAK4G8iNwFS P065NGOL2sGT6XAMz2RTDJqMyc44qHCamgm2ZMb4isnB0a3lKUzTjG/ZOUQDUMzvN1sY ynbAz/MUhZ+XGOh7ztH38AOeE+iIF4w5kPNVpRKXY4vkN5NoRHFFkTdjzdLdtKv1Q43q rkXd9cm+Nj+UREAc1VwyF6KCSCLJGyOqIDCc48JT+kuYiS5J5RrN8y0W+iXyVpHmNyHi jmRKUDRGC9LlQQiYApcMASlk/6mMCjUTQ7ZNg0/hpZvpA8s+UQuOPvOgxFJ7KIuSwzc7 B/mg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=qdQX3WNw; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id t11-20020a17090b018b00b002694ae34910si370726pjs.66.2023.08.09.17.39.12; Wed, 09 Aug 2023 17:39:26 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=qdQX3WNw; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232967AbjHIXYg (ORCPT + 99 others); Wed, 9 Aug 2023 19:24:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50126 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232261AbjHIXYa (ORCPT ); Wed, 9 Aug 2023 19:24:30 -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 8501F1BFB for ; Wed, 9 Aug 2023 16:24:27 -0700 (PDT) Received: by mail-pf1-x431.google.com with SMTP id d2e1a72fcca58-686daaa5f1fso243005b3a.3 for ; Wed, 09 Aug 2023 16:24:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1691623467; x=1692228267; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=2tar+fwRF9EwexnZBlGXBQ+bino7OPSUOa9FVKEDgW8=; b=qdQX3WNwo4sWt4WkjKnJ08HLG31URbRoXVf7H5AnZ3n4OTaa437cOko2jjYggYBNx3 Uqtl8hjdOaQ5sFdI1pNdsg5WlvudRipmfEHH3jC3kSBPVvsl7sDCBIi9hJH3htjd+Scj +x4lyW8BfGjDQRdW6mPcEQh967lWkyY2MfrU8iYYuoqSur4+c4vzP8UjeTWZVpmWsXTi GrPLP1dKdTJl7/hWM1px5eML9DIPSblOF40Phwg5YuT2IX5LPipDqccZemKALDv8ntos VpDwK38TgYbp1DMAPUyfGhk2yDGhNkoAIbI8xAeXULhQkWloI08NyYlwSj+DJ7tiDJ+v bzLg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1691623467; x=1692228267; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=2tar+fwRF9EwexnZBlGXBQ+bino7OPSUOa9FVKEDgW8=; b=iNG6k7xvRr0WtS2PN2mWTyy12W3+DqMw0d7XSG/TXsZKXvzgKzaf5XRXvP4mIzHgbq +iVNV/9ztzHCowpUhcupHtVlgzmLbhg4UNPIDXCuWadP0BQpEE4WIkwi1K8opy8lqLLl LYOTA51f22P0Ux9+4Y64CzdzlKBC22bVCiT8ZRkjXn6xBejk6vnF/DtZRTU8klWF/9R1 vwKi++TjDwmhvrXMVvMlIy2A97nGSzXTcwC0dS1Evblbdp7JScz67WqMNu9DQdXT9jED vXzqnaj5AzBp6aCYoRU/GWqwba8j5b3v3Odxwbgr4M9TgFIncolj0vgmN3wnvSchliFh dXGw== X-Gm-Message-State: AOJu0Yy1QKpRzeb6II5GvX881qehL4G65e5xC65uceOXde7auSeL+4IT fL02pNBeUSXhL8Xmhxs0W4v85A== X-Received: by 2002:a05:6a20:12c2:b0:131:4808:d5a1 with SMTP id v2-20020a056a2012c200b001314808d5a1mr781717pzg.28.1691623467045; Wed, 09 Aug 2023 16:24:27 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id l18-20020a170902d35200b001b54d064a4bsm82765plk.259.2023.08.09.16.24.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 09 Aug 2023 16:24:26 -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 v10 4/4] RISC-V: mm: Document mmap changes Date: Wed, 9 Aug 2023 16:22:04 -0700 Message-ID: <20230809232218.849726-5-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809232218.849726-1-charlie@rivosinc.com> References: <20230809232218.849726-1-charlie@rivosinc.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1773800486195045542 X-GMAIL-MSGID: 1773800486195045542 The behavior of mmap is modified with this patch series, so explain the changes to the mmap hint address behavior. Signed-off-by: Charlie Jenkins Reviewed-by: Alexandre Ghiti --- Documentation/riscv/vm-layout.rst | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/Documentation/riscv/vm-layout.rst b/Documentation/riscv/vm-layout.rst index 5462c84f4723..69ff6da1dbf8 100644 --- a/Documentation/riscv/vm-layout.rst +++ b/Documentation/riscv/vm-layout.rst @@ -133,3 +133,25 @@ RISC-V Linux Kernel SV57 ffffffff00000000 | -4 GB | ffffffff7fffffff | 2 GB | modules, BPF ffffffff80000000 | -2 GB | ffffffffffffffff | 2 GB | kernel __________________|____________|__________________|_________|____________________________________________________________ + + +Userspace VAs +-------------------- +To maintain compatibility with software that relies on the VA space with a +maximum of 48 bits the kernel will, by default, return virtual addresses to +userspace from a 48-bit range (sv48). This default behavior is achieved by +passing 0 into the hint address parameter of mmap. On CPUs with an address space +smaller than sv48, the CPU maximum supported address space will be the default. + +Software can "opt-in" to receiving VAs from another VA space by providing +a hint address to mmap. A hint address passed to mmap will cause the largest +address space that fits entirely into the hint to be used, unless there is no +space left in the address space. If there is no space available in the requested +address space, an address in the next smallest available address space will be +returned. + +For example, in order to obtain 48-bit VA space, a hint address greater than +:code:`1 << 47` must be provided. Note that this is 47 due to sv48 userspace +ending at :code:`1 << 47` and the addresses beyond this are reserved for the +kernel. Similarly, to obtain 57-bit VA space addresses, a hint address greater +than or equal to :code:`1 << 56` must be provided.