Changes in pgtable.h

3e9807aa - um: Include missing headers in asm/pgtable.h

Mon, 13 Jan 2025 15:32:17 +0000

um: Include missing headers in asm/pgtable.hFormerly, asm/pgtable.h relied on the implicit inclusion of asm/page.hand linux/mm_types.h via asm/fixmap.h. With the removal of asm/fixmap.h,these headers need to be included explicitly in asm/pgtable.h now.Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202501131814.E6CxjulL-lkp@intel.com/Fixes: 5bfc4a3a0af3 ("um: Remove obsolete fixmap support")Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20250113153218.3331321-2-tiwei.btw@antgroup.comSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/include/asm/pgtable.h

5bfc4a3a - um: Remove obsolete fixmap support

Thu, 28 Nov 2024 08:19:38 +0000

um: Remove obsolete fixmap supportIt was added to support highmem. But since the highmem support hasbeen removed by commit a98a6d864d3b ("um: Remove broken highmemsupport"), it is no longer needed. Remove it to simplify the code.Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241128081939.2216246-3-tiwei.btw@antgroup.comSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/include/asm/pgtable.h

aa36314c - um: Remove unused MODULES_LEN macro

Thu, 28 Nov 2024 08:19:37 +0000

um: Remove unused MODULES_LEN macroIt's not used anywhere. And its definition doesn't seem right.Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241128081939.2216246-2-tiwei.btw@antgroup.comSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/include/asm/pgtable.h

c5c3238d - asm-generic: provide generic page_to_phys and phys_to_page implementations

Wed, 23 Oct 2024 05:36:36 +0000

asm-generic: provide generic page_to_phys and phys_to_page implementationspage_to_phys is duplicated by all architectures, and from some strangereason placed in where it doesn't fit at all.phys_to_page is only provided by a few architectures despite having a lotof open coded users.Provide generic versions in to make thesehelpers more easily usable.Note with this patch powerpc loses the CONFIG_DEBUG_VIRTUAL pfn_validcheck. It will be added back in a generic version later.Signed-off-by: Christoph Hellwig Signed-off-by: Arnd Bergmann List of files: /linux-6.15/arch/um/include/asm/pgtable.h

9b088185 - um: Rename _PAGE_NEWPAGE to _PAGE_NEEDSYNC

Fri, 11 Oct 2024 10:23:54 +0000

um: Rename _PAGE_NEWPAGE to _PAGE_NEEDSYNCThe _PAGE_NEWPAGE bit does not really indicate that this is a new page,but rather whether this entry needs to be synced or not. Renaming itto _PAGE_NEEDSYNC will make it more clear how everything ties together.Suggested-by: Benjamin Berg Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241011102354.1682626-3-tiwei.btw@antgroup.comSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/include/asm/pgtable.h

2717c6b6 - um: Abandon the _PAGE_NEWPROT bit

Fri, 11 Oct 2024 10:23:53 +0000

um: Abandon the _PAGE_NEWPROT bitWhen a PTE is updated in the page table, the _PAGE_NEWPAGE bit willalways be set. And the corresponding page will always be mapped orunmapped depending on whether the PTE is present or not. The checkon the _PAGE_NEWPROT bit is not really reachable. Abandoning it willallow us to simplify the code and remove the unreachable code.Reviewed-by: Benjamin Berg Signed-off-by: Tiwei Bie Link: https://patch.msgid.link/20241011102354.1682626-2-tiwei.btw@antgroup.comSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/include/asm/pgtable.h

41ab5fe7 - um: Switch to 4 level page tables on 64 bit

Thu, 19 Sep 2024 12:45:11 +0000

um: Switch to 4 level page tables on 64 bitThe larger memory space is useful to support more applications insideUML. One example for this is ASAN instrumentation of userspaceapplications which requires addresses that would otherwise not beavailable.Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20240919124511.282088-11-benjamin@sipsolutions.netSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/include/asm/pgtable.h

2fcd16fb - um: Remove unused kpte_clear_flush macro

Mon, 26 Aug 2024 10:08:09 +0000

um: Remove unused kpte_clear_flush macroThis macro has no users, and __flush_tlb_one doesn't exist either.Signed-off-by: Tiwei Bie Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/include/asm/pgtable.h

bcf3d957 - um: refactor TLB update handling

Wed, 03 Jul 2024 13:45:36 +0000

um: refactor TLB update handlingConceptually, we want the memory mappings to always be up to date andrepresent whatever is in the TLB. To ensure that, we need to sync themover in the userspace case and for the kernel we need to process themappings.The kernel will call flush_tlb_* if page table entries that were validbefore become invalid. Unfortunately, this is not the case if entriesare added.As such, change both flush_tlb_* and set_ptes to track the memory rangethat has to be synchronized. For the kernel, we need to execute aflush_tlb_kern_* immediately but we can wait for the first page fault incase of set_ptes. For userspace in contrast we only store that a rangeof memory needs to be synced and do so whenever we switch to thatprocess.Signed-off-by: Benjamin Berg Link: https://patch.msgid.link/20240703134536.1161108-13-benjamin@sipsolutions.netSigned-off-by: Johannes Berg List of files: /linux-6.15/arch/um/include/asm/pgtable.h

fd8132e6 - um: implement the new page table range API

Wed, 02 Aug 2023 15:13:55 +0000

um: implement the new page table range APIAdd PFN_PTE_SHIFT and update_mmu_cache_range().Link: https://lkml.kernel.org/r/20230802151406.3735276-28-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) Acked-by: Mike Rapoport (IBM) Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Signed-off-by: Andrew Morton List of files: /linux-6.15/arch/um/include/asm/pgtable.h

2f0584f3 - mm: Rename arch pte_mkwrite()'s to pte_mkwrite_novma()

Tue, 13 Jun 2023 00:10:27 +0000

mm: Rename arch pte_mkwrite()'s to pte_mkwrite_novma()The x86 Shadow stack feature includes a new type of memory called shadowstack. This shadow stack memory has some unusual properties, which requiressome core mm changes to function properly.One of these unusual properties is that shadow stack memory is writable,but only in limited ways. These limits are applied via a specific PTEbit combination. Nevertheless, the memory is writable, and core mm codewill need to apply the writable permissions in the typical paths thatcall pte_mkwrite(). The goal is to make pte_mkwrite() take a VMA, sothat the x86 implementation of it can know whether to create regularwritable or shadow stack mappings.But there are a couple of challenges to this. Modifying the signatures ofeach arch pte_mkwrite() implementation would be error prone because someare generated with macros and would need to be re-implemented. Also, somepte_mkwrite() callers operate on kernel memory without a VMA.So this can be done in a three step process. First pte_mkwrite() can berenamed to pte_mkwrite_novma() in each arch, with a generic pte_mkwrite()added that just calls pte_mkwrite_novma(). Next callers without a VMA canbe moved to pte_mkwrite_novma(). And lastly, pte_mkwrite() and all callerscan be changed to take/pass a VMA.Start the process by renaming pte_mkwrite() to pte_mkwrite_novma() andadding the pte_mkwrite() wrapper in linux/pgtable.h. Apply the samepattern for pmd_mkwrite(). Since not all archs have a pmd_mkwrite_novma(),create a new arch config HAS_HUGE_PAGE that can be used to tell ifpmd_mkwrite() should be defined. Otherwise in the !HAS_HUGE_PAGE cases thecompiler would not be able to find pmd_mkwrite_novma().No functional change.Suggested-by: Linus Torvalds Signed-off-by: Rick Edgecombe Signed-off-by: Dave Hansen Reviewed-by: Mike Rapoport (IBM) Acked-by: Geert Uytterhoeven Acked-by: David Hildenbrand Link: https://lore.kernel.org/lkml/CAHk-=wiZjSu7c9sFYZb3q04108stgHff2wfbokGCCgW7riz+8Q@mail.gmail.com/Link: https://lore.kernel.org/all/20230613001108.3040476-2-rick.p.edgecombe%40intel.com List of files: /linux-6.15/arch/um/include/asm/pgtable.h

950fe885 - mm: remove __HAVE_ARCH_PTE_SWP_EXCLUSIVE

Fri, 13 Jan 2023 17:10:26 +0000

mm: remove __HAVE_ARCH_PTE_SWP_EXCLUSIVE__HAVE_ARCH_PTE_SWP_EXCLUSIVE is now supported by all architectures thatsupport swp PTEs, so let's drop it.Link: https://lkml.kernel.org/r/20230113171026.582290-27-david@redhat.comSigned-off-by: David Hildenbrand Signed-off-by: Andrew Morton List of files: /linux-6.15/arch/um/include/asm/pgtable.h

e2858d77 - um/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE

Fri, 13 Jan 2023 17:10:23 +0000

um/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVELet's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using bit 10, which is yetunused for swap PTEs.The pte_mkuptodate() is a bit weird in __pte_to_swp_entry() for a swap PTE... but it only messes with bit 1 and 2 and there is a comment inset_pte(), so leave these bits alone.While at it, mask the type in __swp_entry().Link: https://lkml.kernel.org/r/20230113171026.582290-24-david@redhat.comSigned-off-by: David Hildenbrand Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Signed-off-by: Andrew Morton List of files: /linux-6.15/arch/um/include/asm/pgtable.h

e025ab84 - mm: remove kern_addr_valid() completely

Tue, 18 Oct 2022 07:40:14 +0000

mm: remove kern_addr_valid() completelyMost architectures (except arm64/x86/sparc) simply return 1 forkern_addr_valid(), which is only used in read_kcore(), and it callscopy_from_kernel_nofault() which could check whether the address is avalid kernel address. So as there is no need for kern_addr_valid(), let'sremove it.Link: https://lkml.kernel.org/r/20221018074014.185687-1-wangkefeng.wang@huawei.comSigned-off-by: Kefeng Wang Acked-by: Geert Uytterhoeven [m68k]Acked-by: Heiko Carstens [s390]Acked-by: Christoph Hellwig Acked-by: Helge Deller [parisc]Acked-by: Michael Ellerman [powerpc]Acked-by: Guo Ren [csky]Acked-by: Catalin Marinas [arm64]Cc: Alexander Gordeev Cc: Andy Lutomirski Cc: Anton Ivanov Cc: Cc: Borislav Petkov Cc: Christian Borntraeger Cc: Christophe Leroy Cc: Chris Zankel Cc: Dave Hansen Cc: David S. Miller Cc: Dinh Nguyen Cc: Greg Ungerer Cc: H. Peter Anvin Cc: Huacai Chen Cc: Ingo Molnar Cc: Ivan Kokshaysky Cc: James Bottomley Cc: Johannes Berg Cc: Jonas Bonn Cc: Matt Turner Cc: Max Filippov Cc: Michal Simek Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Richard Henderson Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Stefan Kristiansson Cc: Sven Schnelle Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: Will Deacon Cc: Xuerui Wang Cc: Yoshinori Sato Signed-off-by: Andrew Morton List of files: /linux-6.15/arch/um/include/asm/pgtable.h

91a8da02 - um/mm: enable ARCH_HAS_VM_GET_PAGE_PROT

Mon, 11 Jul 2022 07:05:58 +0000

um/mm: enable ARCH_HAS_VM_GET_PAGE_PROTThis enables ARCH_HAS_VM_GET_PAGE_PROT on the platform and exportsstandard vm_get_page_prot() implementation via DECLARE_VM_GET_PAGE_PROT,which looks up a private and static protection_map[] array. Subsequentlyall __SXXX and __PXXX macros can be dropped which are no longer needed.Link: https://lkml.kernel.org/r/20220711070600.2378316-25-anshuman.khandual@arm.comSigned-off-by: Anshuman Khandual Cc: Jeff Dike Cc: Arnd Bergmann Cc: Brian Cain Cc: Catalin Marinas Cc: Christophe Leroy Cc: Christoph Hellwig Cc: Christoph Hellwig Cc: Chris Zankel Cc: "David S. Miller" Cc: Dinh Nguyen Cc: Geert Uytterhoeven Cc: Guo Ren Cc: Heiko Carstens Cc: Huacai Chen Cc: Ingo Molnar Cc: "James E.J. Bottomley" Cc: Jonas Bonn Cc: Michael Ellerman Cc: Michal Simek Cc: Nicholas Piggin Cc: Palmer Dabbelt Cc: Paul Mackerras Cc: Paul Walmsley Cc: Richard Henderson Cc: Rich Felker Cc: Russell King Cc: Sam Ravnborg Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Vasily Gorbik Cc: Vineet Gupta Cc: WANG Xuerui Cc: Will Deacon Cc: Yoshinori Sato Signed-off-by: Andrew Morton List of files: /linux-6.15/arch/um/include/asm/pgtable.h

7106c51e - arch: Add pmd_pfn() where it is missing

Fri, 04 Feb 2022 18:49:20 +0000

arch: Add pmd_pfn() where it is missingWe need to use this function in common code, so define it forarchitectures and/or configrations that miss it. The result ofpmd_pfn() will only be used if TRANSPARENT_HUGEPAGE is enabled,but a function or macro called pmd_pfn() must be defined, evenon machines with two level page tables.Signed-off-by: Mike Rapoport Signed-off-by: Matthew Wilcox (Oracle) List of files: /linux-6.15/arch/um/include/asm/pgtable.h

6e166319 - um: pgtable.h: Fix W=1 warning for empty body in 'do' statement

Wed, 14 Apr 2021 06:43:48 +0000

um: pgtable.h: Fix W=1 warning for empty body in 'do' statementUse the common kernel style to eliminate a warning:./arch/um/include/asm/pgtable.h:305:47: warning: suggest braces around empty body in ‘do’ statement [-Wempty-body] #define update_mmu_cache(vma,address,ptep) do ; while (0) ^mm/filemap.c:3212:3: note: in expansion of macro ‘update_mmu_cache’ update_mmu_cache(vma, addr, vmf->pte); ^~~~~~~~~~~~~~~~Signed-off-by: Randy Dunlap Cc: Jeff Dike Cc: Richard Weinberger Cc: Anton Ivanov Cc: linux-um@lists.infradead.orgSigned-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/include/asm/pgtable.h

a31e9c4e - Revert "um: support some of ARCH_HAS_SET_MEMORY"

Sun, 10 Jan 2021 18:05:09 +0000

Revert "um: support some of ARCH_HAS_SET_MEMORY"This reverts commit 963285b0b47a ("um: support some ofARCH_HAS_SET_MEMORY"), as it turns out that it's not only notworking (due to um never using the protection bits in thepage tables) but also corrupts the page tables if used on anon-vmalloc page, since um never allocates proper page tablesfor the 'physmem' in the first place.Fixing all this will take more effort, so for now revert it.Reported-by: Benjamin Berg Fixes: 963285b0b47a ("um: support some of ARCH_HAS_SET_MEMORY")Signed-off-by: Johannes Berg Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/include/asm/pgtable.h

963285b0 - um: support some of ARCH_HAS_SET_MEMORY

Sat, 05 Dec 2020 20:50:17 +0000

um: support some of ARCH_HAS_SET_MEMORYFor now, only support set_memory_ro()/rw() which we need forthe stack protection in the next patch.Signed-off-by: Johannes Berg Signed-off-by: Richard Weinberger List of files: /linux-6.15/arch/um/include/asm/pgtable.h

974b9b2c - mm: consolidate pte_index() and pte_offset_*() definitions

Tue, 09 Jun 2020 04:33:10 +0000

mm: consolidate pte_index() and pte_offset_*() definitionsAll architectures define pte_index() as (address >> PAGE_SHIFT) & (PTRS_PER_PTE - 1)and all architectures define pte_offset_kernel() as an entry in the arrayof PTEs indexed by the pte_index().For the most architectures the pte_offset_kernel() implementation relieson the availability of pmd_page_vaddr() that converts a PMD entry value tothe virtual address of the page containing PTEs array.Let's move x86 definitions of the PTE accessors to the generic place in and then simply drop the respective definitions from theother architectures.The architectures that didn't provide pmd_page_vaddr() are updated to havethat defined.The generic implementation of pte_offset_kernel() can be overridden by anarchitecture and alpha makes use of this because it has special orderingrequirements for its version of pte_offset_kernel().[rppt@linux.ibm.com: v2] Link: http://lkml.kernel.org/r/20200514170327.31389-11-rppt@kernel.org[rppt@linux.ibm.com: update] Link: http://lkml.kernel.org/r/20200514170327.31389-12-rppt@kernel.org[rppt@linux.ibm.com: update] Link: http://lkml.kernel.org/r/20200514170327.31389-13-rppt@kernel.org[akpm@linux-foundation.org: fix x86 warning][sfr@canb.auug.org.au: fix powerpc build] Link: http://lkml.kernel.org/r/20200607153443.GB738695@linux.ibm.comSigned-off-by: Mike Rapoport Signed-off-by: Stephen Rothwell Signed-off-by: Andrew Morton Cc: Arnd Bergmann Cc: Borislav Petkov Cc: Brian Cain Cc: Catalin Marinas Cc: Chris Zankel Cc: "David S. Miller" Cc: Geert Uytterhoeven Cc: Greentime Hu Cc: Greg Ungerer Cc: Guan Xuetao Cc: Guo Ren Cc: Heiko Carstens Cc: Helge Deller Cc: Ingo Molnar Cc: Ley Foon Tan Cc: Mark Salter Cc: Matthew Wilcox Cc: Matt Turner Cc: Max Filippov Cc: Michael Ellerman Cc: Michal Simek Cc: Nick Hu Cc: Paul Walmsley Cc: Richard Weinberger Cc: Rich Felker Cc: Russell King Cc: Stafford Horne Cc: Thomas Bogendoerfer Cc: Thomas Gleixner Cc: Tony Luck Cc: Vincent Chen Cc: Vineet Gupta Cc: Will Deacon Cc: Yoshinori Sato Link: http://lkml.kernel.org/r/20200514170327.31389-10-rppt@kernel.orgSigned-off-by: Linus Torvalds List of files: /linux-6.15/arch/um/include/asm/pgtable.h