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Thu, 05 Sep 2024 14:16:14 -0700 (PDT) From: Charlie Jenkins Date: Thu, 05 Sep 2024 14:15:51 -0700 Subject: [PATCH RFC v3 1/2] mm: Add personality flag to limit address to 47 bits Precedence: bulk X-Mailing-List: sparclinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240905-patches-below_hint_mmap-v3-1-3cd5564efbbb@rivosinc.com> References: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> In-Reply-To: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> To: Arnd Bergmann , Richard Henderson , Ivan Kokshaysky , Matt Turner , Vineet Gupta , Russell King , Guo Ren , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Shuah Khan , Christoph Hellwig , Michal Hocko , "Kirill A. Shutemov" , Chris Torek Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-abi-devel@lists.sourceforge.net, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=1348; i=charlie@rivosinc.com; h=from:subject:message-id; bh=B2nFsYQPUa93R6MPC6rybC4BjlmBU89eB/xyA3tmSh8=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ9ot+em/OZQnfrnX8ed38Mt7a5qeTLghH2JpoLVOM/lWE E9Dee3VjlIWBjEOBlkxRRaeaw3MrXf0y46Klk2AmcPKBDKEgYtTACbS9pyRoX//nRvvVlydp7Xm 8/1ihzrxA51eb31tEvRWPpi166jgtMMM/2Pui4Sr/NDPPh503bbDcC77kZANfKUH/kz3LrfLiU2 exg4A X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 Create a personality flag ADDR_LIMIT_47BIT to support applications that wish to transition from running in environments that support at most 47-bit VAs to environments that support larger VAs. This personality can be set to cause all allocations to be below the 47-bit boundary. Using MAP_FIXED with mmap() will bypass this restriction. Signed-off-by: Charlie Jenkins --- include/uapi/linux/personality.h | 1 + mm/mmap.c | 3 +++ 2 files changed, 4 insertions(+) diff --git a/include/uapi/linux/personality.h b/include/uapi/linux/personality.h index 49796b7756af..cd3b8c154d9b 100644 --- a/include/uapi/linux/personality.h +++ b/include/uapi/linux/personality.h @@ -22,6 +22,7 @@ enum { WHOLE_SECONDS = 0x2000000, STICKY_TIMEOUTS = 0x4000000, ADDR_LIMIT_3GB = 0x8000000, + ADDR_LIMIT_47BIT = 0x10000000, }; /* diff --git a/mm/mmap.c b/mm/mmap.c index d0dfc85b209b..a5c7544853e5 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1766,6 +1766,9 @@ unsigned long vm_unmapped_area(struct vm_unmapped_area_info *info) { unsigned long addr; + if (current->personality & ADDR_LIMIT_47BIT) + info->high_limit = MIN(info->high_limit, BIT(47) - 1); + if (info->flags & VM_UNMAPPED_AREA_TOPDOWN) addr = unmapped_area_topdown(info); else From patchwork Thu Sep 5 21:15:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Charlie Jenkins X-Patchwork-Id: 1981442 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@legolas.ozlabs.org Authentication-Results: legolas.ozlabs.org; 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Thu, 05 Sep 2024 14:16:19 -0700 (PDT) Received: from charlie.ba.rivosinc.com ([64.71.180.162]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7d4fbda7abesm3775746a12.61.2024.09.05.14.16.15 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Sep 2024 14:16:18 -0700 (PDT) From: Charlie Jenkins Date: Thu, 05 Sep 2024 14:15:52 -0700 Subject: [PATCH RFC v3 2/2] selftests/mm: Create ADDR_LIMIT_47BIT test Precedence: bulk X-Mailing-List: sparclinux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20240905-patches-below_hint_mmap-v3-2-3cd5564efbbb@rivosinc.com> References: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> In-Reply-To: <20240905-patches-below_hint_mmap-v3-0-3cd5564efbbb@rivosinc.com> To: Arnd Bergmann , Richard Henderson , Ivan Kokshaysky , Matt Turner , Vineet Gupta , Russell King , Guo Ren , Huacai Chen , WANG Xuerui , Thomas Bogendoerfer , "James E.J. Bottomley" , Helge Deller , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Naveen N Rao , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Yoshinori Sato , Rich Felker , John Paul Adrian Glaubitz , "David S. Miller" , Andreas Larsson , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Andy Lutomirski , Peter Zijlstra , Muchun Song , Andrew Morton , "Liam R. Howlett" , Vlastimil Babka , Lorenzo Stoakes , Shuah Khan , Christoph Hellwig , Michal Hocko , "Kirill A. Shutemov" , Chris Torek Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-abi-devel@lists.sourceforge.net, Charlie Jenkins X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2582; i=charlie@rivosinc.com; h=from:subject:message-id; bh=v+6JyaTNEum7sQVRfCLlZa2h0GjRhYNybjctqPTjXjI=; b=owGbwMvMwCHWx5hUnlvL8Y3xtFoSQ9ot+RkaGxaJ/61aKCWQFuW4/RLXZ/ZytuJlXCePW/lm/ BEMfPmgo5SFQYyDQVZMkYXnWgNz6x39sqOiZRNg5rAygQxh4OIUgIl8VmJkmJ40y3j9/d1mFyvf My3sVpqs+9/6YNER2ftWy07b31r7azfDfzfJmfzFLLNYSxYW7GExLQoUvbVs9j2GHob0FXfdby4 9wwcA X-Developer-Key: i=charlie@rivosinc.com; a=openpgp; fpr=7D834FF11B1D8387E61C776FFB10D1F27D6B1354 Add a selftest for the ADDR_LIMIT_47BIT personality flag that mmaps until it runs out of space and ensures no addresses are allocated above 47 bits. Signed-off-by: Charlie Jenkins --- tools/testing/selftests/mm/.gitignore | 1 + tools/testing/selftests/mm/Makefile | 1 + tools/testing/selftests/mm/map_47bit_personality.c | 34 ++++++++++++++++++++++ 3 files changed, 36 insertions(+) diff --git a/tools/testing/selftests/mm/.gitignore b/tools/testing/selftests/mm/.gitignore index da030b43e43b..918ef05e180d 100644 --- a/tools/testing/selftests/mm/.gitignore +++ b/tools/testing/selftests/mm/.gitignore @@ -32,6 +32,7 @@ mlock-random-test virtual_address_range gup_test va_128TBswitch +map_47bit_personality map_fixed_noreplace write_to_hugetlbfs hmm-tests diff --git a/tools/testing/selftests/mm/Makefile b/tools/testing/selftests/mm/Makefile index cfad627e8d94..2e95fd545409 100644 --- a/tools/testing/selftests/mm/Makefile +++ b/tools/testing/selftests/mm/Makefile @@ -50,6 +50,7 @@ TEST_GEN_FILES += hugepage-shm TEST_GEN_FILES += hugepage-vmemmap TEST_GEN_FILES += khugepaged TEST_GEN_FILES += madv_populate +TEST_GEN_FILES += map_47bit_personality TEST_GEN_FILES += map_fixed_noreplace TEST_GEN_FILES += map_hugetlb TEST_GEN_FILES += map_populate diff --git a/tools/testing/selftests/mm/map_47bit_personality.c b/tools/testing/selftests/mm/map_47bit_personality.c new file mode 100644 index 000000000000..453412990c21 --- /dev/null +++ b/tools/testing/selftests/mm/map_47bit_personality.c @@ -0,0 +1,34 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Test the ADDR_LIMIT_47BIT personality flag. + */ +#include +#include +#include +#include "../kselftest.h" + +#define LENGTH (100000000) + +#define ADDR_LIMIT_47BIT 0x10000000 +#define BIT47 1UL << 47 + +/* + * Map memory with ADDR_LIMIT_47BIT until no memory left. Ensure that all returned + * addresses are below 47 bits. + */ +int main(int argc, char **argv) +{ + void *addr; + + syscall(__NR_personality, ADDR_LIMIT_47BIT); + + do { + addr = mmap(0, LENGTH, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); + } while (addr != MAP_FAILED && (unsigned long)addr < BIT47); + + if (errno == ENOMEM) + ksft_test_result_pass("ADDR_LIMIT_47BIT works\n"); + else + ksft_test_result_fail("mmap returned address above 47 bits with ADDR_LIMIT_47BIT with addr: %p and err: %s\n", + addr, strerror(errno)); +}