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Harry Yoo 5f761d40ee x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() 
commit 6659d027998083fbb6d42a165b0c90dc2e8ba989 upstream.

Define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() to ensure
page tables are properly synchronized when calling p*d_populate_kernel().

For 5-level paging, synchronization is performed via
pgd_populate_kernel().  In 4-level paging, pgd_populate() is a no-op, so
synchronization is instead performed at the P4D level via
p4d_populate_kernel().

This fixes intermittent boot failures on systems using 4-level paging and
a large amount of persistent memory:

  BUG: unable to handle page fault for address: ffffe70000000034
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 0 P4D 0
  Oops: 0002 [#1] SMP NOPTI
  RIP: 0010:__init_single_page+0x9/0x6d
  Call Trace:
   <TASK>
   __init_zone_device_page+0x17/0x5d
   memmap_init_zone_device+0x154/0x1bb
   pagemap_range+0x2e0/0x40f
   memremap_pages+0x10b/0x2f0
   devm_memremap_pages+0x1e/0x60
   dev_dax_probe+0xce/0x2ec [device_dax]
   dax_bus_probe+0x6d/0xc9
   [... snip ...]
   </TASK>

It also fixes a crash in vmemmap_set_pmd() caused by accessing vmemmap
before sync_global_pgds() [1]:

  BUG: unable to handle page fault for address: ffffeb3ff1200000
  #PF: supervisor write access in kernel mode
  #PF: error_code(0x0002) - not-present page
  PGD 0 P4D 0
  Oops: Oops: 0002 [#1] PREEMPT SMP NOPTI
  Tainted: [W]=WARN
  RIP: 0010:vmemmap_set_pmd+0xff/0x230
   <TASK>
   vmemmap_populate_hugepages+0x176/0x180
   vmemmap_populate+0x34/0x80
   __populate_section_memmap+0x41/0x90
   sparse_add_section+0x121/0x3e0
   __add_pages+0xba/0x150
   add_pages+0x1d/0x70
   memremap_pages+0x3dc/0x810
   devm_memremap_pages+0x1c/0x60
   xe_devm_add+0x8b/0x100 [xe]
   xe_tile_init_noalloc+0x6a/0x70 [xe]
   xe_device_probe+0x48c/0x740 [xe]
   [... snip ...]

Link: https://lkml.kernel.org/r/20250818020206.4517-4-harry.yoo@oracle.com
Fixes: 8d400913c2 ("x86/vmemmap: handle unpopulated sub-pmd ranges")
Signed-off-by: Harry Yoo <harry.yoo@oracle.com>
Closes: https://lore.kernel.org/linux-mm/20250311114420.240341-1-gwan-gyeong.mun@intel.com [1]
Suggested-by: Dave Hansen <dave.hansen@linux.intel.com>
Acked-by: Kiryl Shutsemau <kas@kernel.org>
Reviewed-by: Mike Rapoport (Microsoft) <rppt@kernel.org>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Ard Biesheuvel <ardb@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: bibo mao <maobibo@loongson.cn>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Christoph Lameter (Ampere) <cl@gentwo.org>
Cc: Dennis Zhou <dennis@kernel.org>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Dmitriy Vyukov <dvyukov@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jane Chu <jane.chu@oracle.com>
Cc: Joao Martins <joao.m.martins@oracle.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: Kevin Brodsky <kevin.brodsky@arm.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleinxer <tglx@linutronix.de>
Cc: Thomas Huth <thuth@redhat.com>
Cc: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2025-09-09 18:54:17 +02:00
..
alpha alpha/elf: Fix misc/setarch test of util-linux by removing 32bit support 2025-03-28 21:58:51 +01:00
arc ARC: build: Try to guess GCC variant of cross compiler 2025-01-09 13:30:05 +01:00
arm ARM: 9448/1: Use an absolute path to unified.h in KBUILD_AFLAGS 2025-08-28 16:26:10 +02:00
arm64 arm64: dts: imx8mp: Fix missing microSD slot vqmmc on DH electronics i.MX8M Plus DHCOM 2025-09-09 18:54:13 +02:00
csky mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
hexagon hexagon: Fix unbalanced spinlock in die() 2025-02-21 13:49:25 +01:00
ia64 mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
loongarch LoongArch: BPF: Fix jump offset calculation in tailcall 2025-08-28 16:25:49 +02:00
m68k m68k: Fix lost column on framebuffer debug console 2025-08-28 16:26:05 +02:00
microblaze microblaze: Export xmb_manager functions 2024-12-14 19:53:20 +01:00
mips mips: lantiq: xway: sysctrl: rename the etop node 2025-09-04 15:26:24 +02:00
nios2 mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
openrisc mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
parisc parisc: Update comments in make_insert_tlb 2025-08-28 16:26:08 +02:00
powerpc powerpc/kvm: Fix ifdef to remove build warning 2025-09-04 15:26:26 +02:00
riscv RISC-V: KVM: Don't treat SBI HFENCE calls as NOPs 2025-06-27 11:07:41 +01:00
s390 s390/hypfs: Enable limited access during lockdown 2025-08-28 16:26:19 +02:00
sh sh: Do not use hyphen in exported variable name 2025-08-15 12:05:04 +02:00
sparc sparc/mm: disable preemption in lazy mmu mode 2025-04-25 10:43:42 +02:00
um um: Re-evaluate thread flags repeatedly 2025-08-28 16:25:56 +02:00
x86 x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings() 2025-09-09 18:54:17 +02:00
xtensa mm: remove kern_addr_valid() completely 2024-11-08 16:26:39 +01:00
.gitignore
Kconfig Revert "mm: mmap: allow for the maximum number of bits for randomizing mmap_base by default" 2024-06-27 13:46:24 +02:00