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Peter Anvin" , Madhavan Srinivasan CC: , , , , , Tong Tiangen , , Guohanjun Subject: [PATCH v13 4/5] arm64: support copy_mc_[user]_highpage() Date: Mon, 9 Dec 2024 10:42:56 +0800 Message-ID: <20241209024257.3618492-5-tongtiangen@huawei.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241209024257.3618492-1-tongtiangen@huawei.com> References: <20241209024257.3618492-1-tongtiangen@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.112.125] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemk500005.china.huawei.com (7.202.194.90) X-Stat-Signature: ocjnf8nzdcsjtzgduccajy6u1yp4bury X-Rspam-User: X-Rspamd-Queue-Id: 90E1620005 X-Rspamd-Server: rspam08 X-HE-Tag: 1733712190-757098 X-HE-Meta: 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 FM/8Dxbh f3peJD99o6sRU9d3kq2n8QfBtxvi16sLXLH+Wwu7M5w2kDzUyfpn95IMPOloMyNQeFK/Ixi4gsqxDe4Ykn0GqOMy0uNFffCcmJhSAWlLmI+0YUAEo7OgKYcoLXA71U2ROP6pdBUl4h2+HecCVJEpmOlYvDtAshexyQoeUIFiOt7VnAl8oorQ3BLIeRe/Kuhef1nlVuYrwYkEaD4YoSmGFrIJVDthm3rmWyeRTKjGtyPBNiR7yY7PbTmNFF2Bit+IPrUuRSN9SrslCzMRJR1FP61JatA== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Currently, many scenarios that can tolerate memory errors when copying page have been supported in the kernel[1~5], all of which are implemented by copy_mc_[user]_highpage(). arm64 should also support this mechanism. Due to mte, arm64 needs to have its own copy_mc_[user]_highpage() architecture implementation, macros __HAVE_ARCH_COPY_MC_HIGHPAGE and __HAVE_ARCH_COPY_MC_USER_HIGHPAGE have been added to control it. Add new helper copy_mc_page() which provide a page copy implementation with hardware memory error safe. The code logic of copy_mc_page() is the same as copy_page(), the main difference is that the ldp insn of copy_mc_page() contains the fixup type EX_TYPE_KACCESS_ERR_ZERO_MEM_ERR, therefore, the main logic is extracted to copy_page_template.S. In addition, the fixup of MOPS insn is not considered at present. [1] commit d302c2398ba2 ("mm, hwpoison: when copy-on-write hits poison, take page offline") [2] commit 1cb9dc4b475c ("mm: hwpoison: support recovery from HugePage copy-on-write faults") [3] commit 6b970599e807 ("mm: hwpoison: support recovery from ksm_might_need_to_copy()") [4] commit 98c76c9f1ef7 ("mm/khugepaged: recover from poisoned anonymous memory") [5] commit 12904d953364 ("mm/khugepaged: recover from poisoned file-backed memory") Signed-off-by: Tong Tiangen --- arch/arm64/include/asm/mte.h | 9 ++++ arch/arm64/include/asm/page.h | 10 ++++ arch/arm64/lib/Makefile | 2 + arch/arm64/lib/copy_mc_page.S | 37 ++++++++++++++ arch/arm64/lib/copy_page.S | 62 ++---------------------- arch/arm64/lib/copy_page_template.S | 70 +++++++++++++++++++++++++++ arch/arm64/lib/mte.S | 29 +++++++++++ arch/arm64/mm/copypage.c | 75 +++++++++++++++++++++++++++++ include/linux/highmem.h | 8 +++ 9 files changed, 245 insertions(+), 57 deletions(-) create mode 100644 arch/arm64/lib/copy_mc_page.S create mode 100644 arch/arm64/lib/copy_page_template.S diff --git a/arch/arm64/include/asm/mte.h b/arch/arm64/include/asm/mte.h index 6567df8ec8ca..efcd850ea2f8 100644 --- a/arch/arm64/include/asm/mte.h +++ b/arch/arm64/include/asm/mte.h @@ -98,6 +98,11 @@ static inline bool try_page_mte_tagging(struct page *page) void mte_zero_clear_page_tags(void *addr); void mte_sync_tags(pte_t pte, unsigned int nr_pages); void mte_copy_page_tags(void *kto, const void *kfrom); + +#ifdef CONFIG_ARCH_HAS_COPY_MC +int mte_copy_mc_page_tags(void *kto, const void *kfrom); +#endif + void mte_thread_init_user(void); void mte_thread_switch(struct task_struct *next); void mte_cpu_setup(void); @@ -134,6 +139,10 @@ static inline void mte_sync_tags(pte_t pte, unsigned int nr_pages) static inline void mte_copy_page_tags(void *kto, const void *kfrom) { } +static inline int mte_copy_mc_page_tags(void *kto, const void *kfrom) +{ + return 0; +} static inline void mte_thread_init_user(void) { } diff --git a/arch/arm64/include/asm/page.h b/arch/arm64/include/asm/page.h index 2312e6ee595f..304cc86b8a10 100644 --- a/arch/arm64/include/asm/page.h +++ b/arch/arm64/include/asm/page.h @@ -29,6 +29,16 @@ void copy_user_highpage(struct page *to, struct page *from, void copy_highpage(struct page *to, struct page *from); #define __HAVE_ARCH_COPY_HIGHPAGE +#ifdef CONFIG_ARCH_HAS_COPY_MC +int copy_mc_page(void *to, const void *from); +int copy_mc_highpage(struct page *to, struct page *from); +#define __HAVE_ARCH_COPY_MC_HIGHPAGE + +int copy_mc_user_highpage(struct page *to, struct page *from, + unsigned long vaddr, struct vm_area_struct *vma); +#define __HAVE_ARCH_COPY_MC_USER_HIGHPAGE +#endif + struct folio *vma_alloc_zeroed_movable_folio(struct vm_area_struct *vma, unsigned long vaddr); #define vma_alloc_zeroed_movable_folio vma_alloc_zeroed_movable_folio diff --git a/arch/arm64/lib/Makefile b/arch/arm64/lib/Makefile index 8e882f479d98..78b0e9904689 100644 --- a/arch/arm64/lib/Makefile +++ b/arch/arm64/lib/Makefile @@ -13,6 +13,8 @@ endif lib-$(CONFIG_ARCH_HAS_UACCESS_FLUSHCACHE) += uaccess_flushcache.o +lib-$(CONFIG_ARCH_HAS_COPY_MC) += copy_mc_page.o + obj-$(CONFIG_CRC32) += crc32.o crc32-glue.o obj-$(CONFIG_FUNCTION_ERROR_INJECTION) += error-inject.o diff --git a/arch/arm64/lib/copy_mc_page.S b/arch/arm64/lib/copy_mc_page.S new file mode 100644 index 000000000000..51564828c30c --- /dev/null +++ b/arch/arm64/lib/copy_mc_page.S @@ -0,0 +1,37 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ + +#include +#include +#include +#include +#include +#include +#include +#include + +/* + * Copy a page from src to dest (both are page aligned) with memory error safe + * + * Parameters: + * x0 - dest + * x1 - src + * Returns: + * x0 - Return 0 if copy success, or -EFAULT if anything goes wrong + * while copying. + */ + .macro ldp1 reg1, reg2, ptr, val + KERNEL_MEM_ERR(9998f, ldp \reg1, \reg2, [\ptr, \val]) + .endm + +SYM_FUNC_START(__pi_copy_mc_page) +#include "copy_page_template.S" + + mov x0, #0 + ret + +9998: mov x0, #-EFAULT + ret + +SYM_FUNC_END(__pi_copy_mc_page) +SYM_FUNC_ALIAS(copy_mc_page, __pi_copy_mc_page) +EXPORT_SYMBOL(copy_mc_page) diff --git a/arch/arm64/lib/copy_page.S b/arch/arm64/lib/copy_page.S index e6374e7e5511..d0186bbf99f1 100644 --- a/arch/arm64/lib/copy_page.S +++ b/arch/arm64/lib/copy_page.S @@ -17,65 +17,13 @@ * x0 - dest * x1 - src */ -SYM_FUNC_START(__pi_copy_page) -#ifdef CONFIG_AS_HAS_MOPS - .arch_extension mops -alternative_if_not ARM64_HAS_MOPS - b .Lno_mops -alternative_else_nop_endif - - mov x2, #PAGE_SIZE - cpypwn [x0]!, [x1]!, x2! - cpymwn [x0]!, [x1]!, x2! - cpyewn [x0]!, [x1]!, x2! - ret -.Lno_mops: -#endif - ldp x2, x3, [x1] - ldp x4, x5, [x1, #16] - ldp x6, x7, [x1, #32] - ldp x8, x9, [x1, #48] - ldp x10, x11, [x1, #64] - ldp x12, x13, [x1, #80] - ldp x14, x15, [x1, #96] - ldp x16, x17, [x1, #112] - - add x0, x0, #256 - add x1, x1, #128 -1: - tst x0, #(PAGE_SIZE - 1) - stnp x2, x3, [x0, #-256] - ldp x2, x3, [x1] - stnp x4, x5, [x0, #16 - 256] - ldp x4, x5, [x1, #16] - stnp x6, x7, [x0, #32 - 256] - ldp x6, x7, [x1, #32] - stnp x8, x9, [x0, #48 - 256] - ldp x8, x9, [x1, #48] - stnp x10, x11, [x0, #64 - 256] - ldp x10, x11, [x1, #64] - stnp x12, x13, [x0, #80 - 256] - ldp x12, x13, [x1, #80] - stnp x14, x15, [x0, #96 - 256] - ldp x14, x15, [x1, #96] - stnp x16, x17, [x0, #112 - 256] - ldp x16, x17, [x1, #112] - - add x0, x0, #128 - add x1, x1, #128 - - b.ne 1b - - stnp x2, x3, [x0, #-256] - stnp x4, x5, [x0, #16 - 256] - stnp x6, x7, [x0, #32 - 256] - stnp x8, x9, [x0, #48 - 256] - stnp x10, x11, [x0, #64 - 256] - stnp x12, x13, [x0, #80 - 256] - stnp x14, x15, [x0, #96 - 256] - stnp x16, x17, [x0, #112 - 256] + .macro ldp1 reg1, reg2, ptr, val + ldp \reg1, \reg2, [\ptr, \val] + .endm +SYM_FUNC_START(__pi_copy_page) +#include "copy_page_template.S" ret SYM_FUNC_END(__pi_copy_page) SYM_FUNC_ALIAS(copy_page, __pi_copy_page) diff --git a/arch/arm64/lib/copy_page_template.S b/arch/arm64/lib/copy_page_template.S new file mode 100644 index 000000000000..f96c7988c93d --- /dev/null +++ b/arch/arm64/lib/copy_page_template.S @@ -0,0 +1,70 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2012 ARM Ltd. + */ + +/* + * Copy a page from src to dest (both are page aligned) + * + * Parameters: + * x0 - dest + * x1 - src + */ + +#ifdef CONFIG_AS_HAS_MOPS + .arch_extension mops +alternative_if_not ARM64_HAS_MOPS + b .Lno_mops +alternative_else_nop_endif + + mov x2, #PAGE_SIZE + cpypwn [x0]!, [x1]!, x2! + cpymwn [x0]!, [x1]!, x2! + cpyewn [x0]!, [x1]!, x2! + ret +.Lno_mops: +#endif + ldp1 x2, x3, x1, #0 + ldp1 x4, x5, x1, #16 + ldp1 x6, x7, x1, #32 + ldp1 x8, x9, x1, #48 + ldp1 x10, x11, x1, #64 + ldp1 x12, x13, x1, #80 + ldp1 x14, x15, x1, #96 + ldp1 x16, x17, x1, #112 + + add x0, x0, #256 + add x1, x1, #128 +1: + tst x0, #(PAGE_SIZE - 1) + + stnp x2, x3, [x0, #-256] + ldp1 x2, x3, x1, #0 + stnp x4, x5, [x0, #16 - 256] + ldp1 x4, x5, x1, #16 + stnp x6, x7, [x0, #32 - 256] + ldp1 x6, x7, x1, #32 + stnp x8, x9, [x0, #48 - 256] + ldp1 x8, x9, x1, #48 + stnp x10, x11, [x0, #64 - 256] + ldp1 x10, x11, x1, #64 + stnp x12, x13, [x0, #80 - 256] + ldp1 x12, x13, x1, #80 + stnp x14, x15, [x0, #96 - 256] + ldp1 x14, x15, x1, #96 + stnp x16, x17, [x0, #112 - 256] + ldp1 x16, x17, x1, #112 + + add x0, x0, #128 + add x1, x1, #128 + + b.ne 1b + + stnp x2, x3, [x0, #-256] + stnp x4, x5, [x0, #16 - 256] + stnp x6, x7, [x0, #32 - 256] + stnp x8, x9, [x0, #48 - 256] + stnp x10, x11, [x0, #64 - 256] + stnp x12, x13, [x0, #80 - 256] + stnp x14, x15, [x0, #96 - 256] + stnp x16, x17, [x0, #112 - 256] diff --git a/arch/arm64/lib/mte.S b/arch/arm64/lib/mte.S index 5018ac03b6bf..9d4eeb76a838 100644 --- a/arch/arm64/lib/mte.S +++ b/arch/arm64/lib/mte.S @@ -80,6 +80,35 @@ SYM_FUNC_START(mte_copy_page_tags) ret SYM_FUNC_END(mte_copy_page_tags) +#ifdef CONFIG_ARCH_HAS_COPY_MC +/* + * Copy the tags from the source page to the destination one with memory error safe + * x0 - address of the destination page + * x1 - address of the source page + * Returns: + * x0 - Return 0 if copy success, or + * -EFAULT if anything goes wrong while copying. + */ +SYM_FUNC_START(mte_copy_mc_page_tags) + mov x2, x0 + mov x3, x1 + multitag_transfer_size x5, x6 +1: +KERNEL_MEM_ERR(2f, ldgm x4, [x3]) + stgm x4, [x2] + add x2, x2, x5 + add x3, x3, x5 + tst x2, #(PAGE_SIZE - 1) + b.ne 1b + + mov x0, #0 + ret + +2: mov x0, #-EFAULT + ret +SYM_FUNC_END(mte_copy_mc_page_tags) +#endif + /* * Read tags from a user buffer (one tag per byte) and set the corresponding * tags at the given kernel address. Used by PTRACE_POKEMTETAGS. diff --git a/arch/arm64/mm/copypage.c b/arch/arm64/mm/copypage.c index a86c897017df..1a369f325ebb 100644 --- a/arch/arm64/mm/copypage.c +++ b/arch/arm64/mm/copypage.c @@ -67,3 +67,78 @@ void copy_user_highpage(struct page *to, struct page *from, flush_dcache_page(to); } EXPORT_SYMBOL_GPL(copy_user_highpage); + +#ifdef CONFIG_ARCH_HAS_COPY_MC +/* + * Return -EFAULT if anything goes wrong while copying page or mte. + */ +int copy_mc_highpage(struct page *to, struct page *from) +{ + void *kto = page_address(to); + void *kfrom = page_address(from); + struct folio *src = page_folio(from); + struct folio *dst = page_folio(to); + unsigned int i, nr_pages; + int ret; + + ret = copy_mc_page(kto, kfrom); + if (ret) + return -EFAULT; + + if (kasan_hw_tags_enabled()) + page_kasan_tag_reset(to); + + if (!system_supports_mte()) + return 0; + + if (folio_test_hugetlb(src)) { + if (!folio_test_hugetlb_mte_tagged(src) || + from != folio_page(src, 0)) + return 0; + + WARN_ON_ONCE(!folio_try_hugetlb_mte_tagging(dst)); + + /* + * Populate tags for all subpages. + * + * Don't assume the first page is head page since + * huge page copy may start from any subpage. + */ + nr_pages = folio_nr_pages(src); + for (i = 0; i < nr_pages; i++) { + kfrom = page_address(folio_page(src, i)); + kto = page_address(folio_page(dst, i)); + ret = mte_copy_mc_page_tags(kto, kfrom); + if (ret) + return -EFAULT; + } + folio_set_hugetlb_mte_tagged(dst); + } else if (page_mte_tagged(from)) { + /* It's a new page, shouldn't have been tagged yet */ + WARN_ON_ONCE(!try_page_mte_tagging(to)); + + ret = mte_copy_mc_page_tags(kto, kfrom); + if (ret) + return -EFAULT; + set_page_mte_tagged(to); + } + + return 0; +} +EXPORT_SYMBOL(copy_mc_highpage); + +int copy_mc_user_highpage(struct page *to, struct page *from, + unsigned long vaddr, struct vm_area_struct *vma) +{ + int ret; + + ret = copy_mc_highpage(to, from); + if (ret) + return ret; + + flush_dcache_page(to); + + return 0; +} +EXPORT_SYMBOL_GPL(copy_mc_user_highpage); +#endif diff --git a/include/linux/highmem.h b/include/linux/highmem.h index 0eb4b9b06837..89a6e0fd0b31 100644 --- a/include/linux/highmem.h +++ b/include/linux/highmem.h @@ -326,6 +326,7 @@ static inline void copy_highpage(struct page *to, struct page *from) #endif #ifdef copy_mc_to_kernel +#ifndef __HAVE_ARCH_COPY_MC_USER_HIGHPAGE /* * If architecture supports machine check exception handling, define the * #MC versions of copy_user_highpage and copy_highpage. They copy a memory @@ -351,7 +352,9 @@ static inline int copy_mc_user_highpage(struct page *to, struct page *from, return ret ? -EFAULT : 0; } +#endif +#ifndef __HAVE_ARCH_COPY_MC_HIGHPAGE static inline int copy_mc_highpage(struct page *to, struct page *from) { unsigned long ret; @@ -370,20 +373,25 @@ static inline int copy_mc_highpage(struct page *to, struct page *from) return ret ? -EFAULT : 0; } +#endif #else +#ifndef __HAVE_ARCH_COPY_MC_USER_HIGHPAGE static inline int copy_mc_user_highpage(struct page *to, struct page *from, unsigned long vaddr, struct vm_area_struct *vma) { copy_user_highpage(to, from, vaddr, vma); return 0; } +#endif +#ifndef __HAVE_ARCH_COPY_MC_HIGHPAGE static inline int copy_mc_highpage(struct page *to, struct page *from) { copy_highpage(to, from); return 0; } #endif +#endif static inline void memcpy_page(struct page *dst_page, size_t dst_off, struct page *src_page, size_t src_off,