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[2620:137:e000::1:20]) by mx.google.com with ESMTP id x2-20020a056a00270200b0068219eb27aesi5866194pfv.182.2023.07.13.18.06.18; Thu, 13 Jul 2023 18:06:31 -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=AL3kuhM3; 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 S234016AbjGNAO7 (ORCPT + 99 others); Thu, 13 Jul 2023 20:14:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233757AbjGNAO5 (ORCPT ); Thu, 13 Jul 2023 20:14:57 -0400 Received: from mail-pf1-x42b.google.com (mail-pf1-x42b.google.com [IPv6:2607:f8b0:4864:20::42b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 02E2C2D46 for ; Thu, 13 Jul 2023 17:14:55 -0700 (PDT) Received: by mail-pf1-x42b.google.com with SMTP id d2e1a72fcca58-68336d06620so1312321b3a.1 for ; Thu, 13 Jul 2023 17:14:54 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=rivosinc-com.20221208.gappssmtp.com; s=20221208; t=1689293694; x=1689898494; 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=gaOlsfnVfuDi3L0JPH/BTa+gkm3/5AuBwRdskT34l3o=; b=AL3kuhM3H/KioO8nbvBIAHfJSh0ylMITN2V1WGhpPItpZGNPicIwiuWqPGD+7VoS0z 9FGlE1CgfAh8cjmYagx4MRN+8wl2lQ+QACCOgOXgGwch30R34LbpdjmgbsCbRm7/1+qS 5lQgBLaufmp7hE48Kz0gDSHhxzktORPOkcKaw+5sYuu2JixEoI9KNU/qSO4KHEMkTjk7 2AO7O4PH5DOiBbl9tv04KSv9dDiZGCL5Ttk+UHhDWqky0jutHbNrNoKDBlqyG+gjhLA4 +CaqYrjt2lGBjIIpu0YFmeiHh6e2hCPllmikOwdH4S53O2RezlO9/m1MwSgzi3xPi/3n gFdA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20221208; t=1689293694; x=1689898494; 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=gaOlsfnVfuDi3L0JPH/BTa+gkm3/5AuBwRdskT34l3o=; b=TLiArOGwy/6NVeAJeov4LDYiZQLO7nEbk3CMTfP2VYNGLNppmnce7cjMayDxEpKEVg fbYb7MYVcI+rbRyeuvEU0k8YCWT9yGeC8M3FffMv6g4t0tVQ9wamICzL5nNB30w4lf3q cg4fxBjMkpv6XozcDWsnwtk7k5tjd8oShNHxj66rvjNYjmOLZvObnaIavAbAlLTWUBti 6EuPD2d29Lsph9sLwP/XJfovD1icSGAxYGlr1km61gAd4FMSGmYffZmJUcfFWIl/PVH6 OJmf+ww7CKalhg/TCjbIBFkL0vTcQTcpL3jjiy2yjMyx1H8j+xtghLkBJPrDxdMI/38q +SsA== X-Gm-Message-State: ABy/qLb7vL9aF+Ll0R35ijvizZIFj2fSPExcEiQhbRWOD8ontrkSzw8A NJcYZ+4YCnI6ES2jmkkzvIXeO08E3anHGcS8mMA= X-Received: by 2002:a05:6a00:23d1:b0:667:e17e:85b7 with SMTP id g17-20020a056a0023d100b00667e17e85b7mr4000094pfc.1.1689293694212; Thu, 13 Jul 2023 17:14:54 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([66.220.2.162]) by smtp.gmail.com with ESMTPSA id x25-20020aa793b9000000b00673e652985esm5938107pff.44.2023.07.13.17.14.52 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Jul 2023 17:14:53 -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 1/4] RISC-V: mm: Restrict address space for sv39,sv48,sv57 Date: Thu, 13 Jul 2023 17:14:00 -0700 Message-ID: <20230714001430.75798-2-charlie@rivosinc.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230714001430.75798-1-charlie@rivosinc.com> References: <20230714001430.75798-1-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_BLOCKED,SPF_HELO_NONE,SPF_PASS, T_SCC_BODY_TEXT_LINE 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: 1771356072033187096 X-GMAIL-MSGID: 1771356072033187096 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 | 12 +++++++- arch/riscv/include/asm/processor.h | 46 +++++++++++++++++++++++++----- 3 files changed, 51 insertions(+), 9 deletions(-) diff --git a/arch/riscv/include/asm/elf.h b/arch/riscv/include/asm/elf.h index 30e7d2455960..1b57f13a1afd 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..e13f5872bfe9 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -63,12 +63,22 @@ * position vmemmap directly below the VMALLOC region. */ #ifdef CONFIG_64BIT +#define VA_BITS_SV39 39 +#define VA_BITS_SV48 48 +#define VA_BITS_SV57 57 + +#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)) + #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 #endif +#define MMAP_VA_BITS ((VA_BITS >= VA_BITS_SV48) ? VA_BITS_SV48 : VA_BITS) + #define VMEMMAP_SHIFT \ (VA_BITS - PAGE_SHIFT - 1 + STRUCT_PAGE_MAX_SHIFT) #define VMEMMAP_SIZE BIT(VMEMMAP_SHIFT) diff --git a/arch/riscv/include/asm/processor.h b/arch/riscv/include/asm/processor.h index 6fb8bbec8459..d889dabada46 100644 --- a/arch/riscv/include/asm/processor.h +++ b/arch/riscv/include/asm/processor.h @@ -12,20 +12,52 @@ #include -/* - * 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 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; \ + 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 if ((addr) == 0) \ + mmap_end = DEFAULT_MAP_WINDOW; \ + else \ + mmap_end = VA_USER_SV39; \ + mmap_end; \ +}) + +#define arch_get_mmap_base(addr, base) \ +({ \ + unsigned long mmap_base; \ + if (((addr) >= VA_USER_SV57) && (VA_BITS >= VA_BITS_SV57)) \ + mmap_base = (base) + (VA_USER_SV57 - DEFAULT_MAP_WINDOW); \ + else if ((((addr) >= VA_USER_SV48)) && (VA_BITS >= VA_BITS_SV48)) \ + mmap_base = (base) + (VA_USER_SV48 - DEFAULT_MAP_WINDOW); \ + else if ((addr) == 0) \ + mmap_base = (base); \ + else \ + mmap_base = (base) + (VA_USER_SV39 - DEFAULT_MAP_WINDOW); \ + 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(DEFAULT_MAP_WINDOW / 3) + #ifndef __ASSEMBLY__ struct task_struct; From patchwork Fri Jul 14 00:14:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 120156 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:a6b2:0:b0:3e4:2afc:c1 with SMTP id c18csp2192295vqm; Thu, 13 Jul 2023 18:06:37 -0700 (PDT) X-Google-Smtp-Source: APBJJlHRwbF7Jz2JYGQBT3pjH/idA/UgHXsS8c/3NzxG0/VV8uoQwL4oB703uMgcaxe6KZ0tR0iH X-Received: by 2002:a17:903:1205:b0:1b9:e972:134d with SMTP id l5-20020a170903120500b001b9e972134dmr2497443plh.3.1689296797435; Thu, 13 Jul 2023 18:06:37 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1689296797; cv=none; d=google.com; s=arc-20160816; b=JthFdeWbrGx0Fb59FSbSW11JtFUg+LdRjfLdcApzNZavbkC94P7JK06tSw7zNDOLHs oK6ww1ybMqIUkwHOep6rL6EcE16HD6yF5IOB59Z7nSkjAfCy482FXPS6Vd4d4HQTVaq9 Vv6zXeyGJhazXBsQPv2Gf40QooPtODPm/aVYbpEXsPbA5yESHijdkH8RVHAIc2Mxfi20 bcMINI6NnvcMd857oK9bUxU+oqp/rK9wZ680wtVpbVkvaM/ZllrHeiuvijyF+h2lRaOP ShbxirqG0wApY4sR4tmofPmBYSJDDBvQjp052qyGZzGSO4y30YogJ8J6wk6z9+5GP2HI mtTw== 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=+0r7ylMNQwjmn0OPkYDCq51XOFGJFq+TLUQNF3+/r/M=; fh=My2jiibqoUeMwsqLbgcWgl692t5ymcXdwYlfrhkAJHk=; b=AQhVsFa59HfNFEus9QTgM+Z8GTw3wR4Ml62aOtT+Gq2+JAmKkZX+rH9jGOIjIu/HCb fjiyvzc1ln0SmDKM8TF4kn2McsqJTYrBsXq8xsY3RvSS1zrNWc7oFR/iGspZDKh819qW /iNVw4x+1HzJV3tIvHXtMmNTKn2wyVMJ1EOSaTeKipf6rR1ykaPFPWYD0tIxHhBs0HvZ BfoSZf9tlxfAmzMkEdmU9Za796Liq7+OP3eY6eG/VTwhLKLmMMWqhY4vy8Abyi72Se7a CWE587rSjY3KNvwzJIFSMapwCsYVArtMsbBuANA7Vv3RZN8A0YK5fJUW8LEDJHyYTJEU FcIQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=haAaWBwo; 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. 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In addition, ensure that rlimit changes do not cause mmap to fail. Signed-off-by: Charlie Jenkins --- 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 ++++++++++++++++++ 4 files changed, 156 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.c diff --git a/tools/testing/selftests/riscv/Makefile b/tools/testing/selftests/riscv/Makefile index 32a72902d045..0fee58f990ae 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 +RISCV_SUBTARGETS ?= hwprobe 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..9a6f303edcd3 --- /dev/null +++ b/tools/testing/selftests/riscv/mm/.gitignore @@ -0,0 +1 @@ +mmap diff --git a/tools/testing/selftests/riscv/mm/Makefile b/tools/testing/selftests/riscv/mm/Makefile new file mode 100644 index 000000000000..cf68e63e7495 --- /dev/null +++ b/tools/testing/selftests/riscv/mm/Makefile @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0 +# Originally tools/testing/selftests/arm64/signal + +# Additional include paths needed by kselftest.h and local headers +CFLAGS += -D_GNU_SOURCE -std=gnu99 -I. + +SRCS := $(filter-out testcases/testcases.c,$(wildcard testcases/*.c)) +PROGS := $(patsubst %.c,%,$(SRCS)) + +# Generated binaries to be installed by top KSFT script +TEST_GEN_PROGS := $(notdir $(PROGS)) + +# Get Kernel headers installed and use them. + +# Including KSFT lib.mk here will also mangle the TEST_GEN_PROGS list +# to account for any OUTPUT target-dirs optionally provided by +# the toplevel makefile +include ../../lib.mk + +$(TEST_GEN_PROGS): $(PROGS) + cp $(PROGS) $(OUTPUT)/ diff --git a/tools/testing/selftests/riscv/mm/testcases/mmap.c b/tools/testing/selftests/riscv/mm/testcases/mmap.c new file mode 100644 index 000000000000..d8e751f7b8c9 --- /dev/null +++ b/tools/testing/selftests/riscv/mm/testcases/mmap.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include + +#include "../../kselftest_harness.h" +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; +}; + +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); +} + +TEST(default_rlimit) +{ +// Only works on 64 bit +#if __riscv_xlen == 64 + struct addresses mmap_addresses; + + do_mmaps(&mmap_addresses); + + EXPECT_NE(mmap_addresses.no_hint, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_37_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_38_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_46_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_47_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_55_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_56_addr, MAP_FAILED); + + EXPECT_LT((unsigned long)mmap_addresses.no_hint, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_37_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_38_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_46_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_47_addr, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_55_addr, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_56_addr, 1UL << 56); +#endif +} + +TEST(zero_rlimit) +{ +// Only works on 64 bit +#if __riscv_xlen == 64 + struct addresses mmap_addresses; + struct rlimit rlim_new = { .rlim_cur = 0, .rlim_max = RLIM_INFINITY }; + + setrlimit(RLIMIT_STACK, &rlim_new); + + do_mmaps(&mmap_addresses); + + EXPECT_NE(mmap_addresses.no_hint, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_37_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_38_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_46_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_47_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_55_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_56_addr, MAP_FAILED); + + EXPECT_LT((unsigned long)mmap_addresses.no_hint, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_37_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_38_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_46_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_47_addr, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_55_addr, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_56_addr, 1UL << 56); +#endif +} + +TEST(infinite_rlimit) +{ +// Only works on 64 bit +#if __riscv_xlen == 64 + struct addresses mmap_addresses; + struct rlimit rlim_new = { .rlim_cur = RLIM_INFINITY, + .rlim_max = RLIM_INFINITY }; + + setrlimit(RLIMIT_STACK, &rlim_new); + + do_mmaps(&mmap_addresses); + + EXPECT_NE(mmap_addresses.no_hint, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_37_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_38_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_46_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_47_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_55_addr, MAP_FAILED); + EXPECT_NE(mmap_addresses.on_56_addr, MAP_FAILED); + + EXPECT_LT((unsigned long)mmap_addresses.no_hint, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_37_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_38_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_46_addr, 1UL << 38); + EXPECT_LT((unsigned long)mmap_addresses.on_47_addr, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_55_addr, 1UL << 47); + EXPECT_LT((unsigned long)mmap_addresses.on_56_addr, 1UL << 56); +#endif +} + +TEST_HARNESS_MAIN From patchwork Fri Jul 14 00:14:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 120150 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:a6b2:0:b0:3e4:2afc:c1 with SMTP id c18csp2181520vqm; Thu, 13 Jul 2023 17:38:46 -0700 (PDT) X-Google-Smtp-Source: APBJJlFKG/QRujUbPBvx6OVFbDvUb00pi08gVrHezYiBIvbUXIHIRyifXFsuNyw4lIn3uiXLrEzk X-Received: by 2002:a2e:b611:0:b0:2b7:2066:10e1 with SMTP id r17-20020a2eb611000000b002b7206610e1mr2703912ljn.0.1689295125817; Thu, 13 Jul 2023 17:38:45 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1689295125; cv=none; d=google.com; s=arc-20160816; b=HtgrQ5nA+4KhPctlZ/BvNz8FD3pHI+9u0Rd54Tnh2Co0VPvimci8laas4+yDaT2L7u I8OsuzWbCWoYpGcNUkqM9/ngckECWp8/5+F+1Z8i4p1kOLOzXy8i+Sm0tctQNzAwaXTL g3+Lhn467R3axQvJ3+PC6WXxl2kfTSyoF5rFkGtUg8K02gYHm9bxvP2LCr/B+s5Y3td7 W9k4+4h67K6yYCHIvPNNXlPsh2axc4fj1nhZyVDIcZ6R4ug+N1hMo6Y5w8nVZc+IESak qKI4iJoYSx/bSqIpJ+Pqnc5E2oNM5frRaxckdIFfh1yS9ta3YbWX39gtNyHLa6R9OPgL Gv2A== ARC-Message-Signature: i=1; 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Signed-off-by: Charlie Jenkins --- 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 e13f5872bfe9..28660bab754c 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -840,14 +840,16 @@ 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 Fri Jul 14 00:14:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 120162 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a59:a6b2:0:b0:3e4:2afc:c1 with SMTP id c18csp2205133vqm; Thu, 13 Jul 2023 18:38:29 -0700 (PDT) X-Google-Smtp-Source: APBJJlHuxlDUN8KfK+aB+O/PTiEpoeJCSUp/KijyYVuZdsOPbr3nq1cXvhOWbFX/UBg9EaAvU1+g X-Received: by 2002:a17:906:25d:b0:993:eddd:6df0 with SMTP id 29-20020a170906025d00b00993eddd6df0mr2805814ejl.28.1689298708785; Thu, 13 Jul 2023 18:38:28 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1689298708; cv=none; d=google.com; s=arc-20160816; b=h2DR05uHSUImrI9CL5snnc13eDNmEyyk1IZTHlkIo8nLVar/WsXyTzBDloPZvPSKpq LlLwkLiaP6dQwQMEltD+/IC28sZjoqJYt1SBUXAO2TTb6TCMXMDak0jPZTa6UXKuaI6q GaR3TwEjt0+RhqNdDHK2+ElYM3lVLHsjm1lOWrU+Y7t6o7S+YBuJ8PgPMbwfy4Kgq2mL NRuRIqjwHLsO6ubJ3EYd7NX8mHITmtGCBkgo/Ukk5cnebowB/Vhv2xyYgyCPawZitFev Fc651nEvV2fPBnDmUVCz1XVcqcQdNfnmQEeHrsWYjJ8jSXBDNGqkJJD13bGFPWguHQBS jqpw== 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=iY0BqE22+vH8ihdQ5F+U3lQTo4OY0Ve5Zo6wbRWfHfc=; fh=My2jiibqoUeMwsqLbgcWgl692t5ymcXdwYlfrhkAJHk=; b=bjC2dCSza9c1QpF1WibLWixy++0AZWE74c/ot1zgI5cIuzNbMRPS/lDmg/v2qtZRtm ZQXuNsaCQPlsWcungZ1jazEn6bGq+ZbBSjcLa5G3xvmgS3nnYpaT86P+uNZB3QRSFxFV 12nXphtZk6IGv1kSYc83EjudxLduSbofaxTgPCfzzvIKCtewdCgtLQk/rxKeLkwoMCSX SKO4T8SI8hHY31syZahGF0SI5c8cFT7yOYp8ak6BFMtRHmXFOYDu2ZbaULg2nopr03BK XNCnMLagClRsL8QOQsf/oDF8kdLCn1fifAp+NUTutDU66J45BPYZuRAsGLnBtYehtXRf uNng== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@rivosinc-com.20221208.gappssmtp.com header.s=20221208 header.b=xExIMHzL; 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. 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Signed-off-by: Charlie Jenkins --- 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..892412b91300 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 call to mmap is guaranteed to return an address +that will not override the unset left-aligned bits in the hint address, +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 << 38` must be provided. Note that this is 38 due to sv39 userspace +ending at :code:`1 << 38` 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 << 47` must be provided.