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3a6455d56b
In order to be able to do this, we need to change VM_DATA_DEFAULT_FLAGS and friends and update the architecture-specific definitions also. We then have to update some KSM logic to handle VMA flags, and introduce VMA_STACK_FLAGS to define the vma_flags_t equivalent of VM_STACK_FLAGS. We also introduce two helper functions for use during the time we are converting legacy flags to vma_flags_t values - vma_flags_to_legacy() and legacy_to_vma_flags(). This enables us to iteratively make changes to break these changes up into separate parts. We use these explicitly here to keep VM_STACK_FLAGS around for certain users which need to maintain the legacy vm_flags_t values for the time being. We are no longer able to rely on the simple VM_xxx being set to zero if the feature is not enabled, so in the case of VM_DROPPABLE we introduce VMA_DROPPABLE as the vma_flags_t equivalent, which is set to EMPTY_VMA_FLAGS if the droppable flag is not available. While we're here, we make the description of do_brk_flags() into a kdoc comment, as it almost was already. We use vma_flags_to_legacy() to not need to update the vm_get_page_prot() logic as this time. Note that in create_init_stack_vma() we have to replace the BUILD_BUG_ON() with a VM_WARN_ON_ONCE() as the tested values are no longer build time available. We also update mprotect_fixup() to use VMA flags where possible, though we have to live with a little duplication between vm_flags_t and vma_flags_t values for the time being until further conversions are made. While we're here, update VM_SPECIAL to be defined in terms of VMA_SPECIAL_FLAGS now we have vma_flags_to_legacy(). Finally, we update the VMA tests to reflect these changes. Link: https://lkml.kernel.org/r/d02e3e45d9a33d7904b149f5604904089fd640ae.1774034900.git.ljs@kernel.org Signed-off-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org> Acked-by: Paul Moore <paul@paul-moore.com> [SELinux] Acked-by: Vlastimil Babka (SUSE) <vbabka@kernel.org> Cc: Albert Ou <aou@eecs.berkeley.edu> Cc: Alexander Gordeev <agordeev@linux.ibm.com> Cc: Alexandre Ghiti <alex@ghiti.fr> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com> Cc: "Borislav Petkov (AMD)" <bp@alien8.de> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Chengming Zhou <chengming.zhou@linux.dev> Cc: Christian Borntraeger <borntraeger@linux.ibm.com> Cc: Christian Brauner <brauner@kernel.org> Cc: David Hildenbrand <david@kernel.org> Cc: Dinh Nguyen <dinguyen@kernel.org> Cc: Heiko Carstens <hca@linux.ibm.com> Cc: "H. Peter Anvin" <hpa@zytor.com> Cc: Huacai Chen <chenhuacai@kernel.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Jan Kara <jack@suse.cz> Cc: Jann Horn <jannh@google.com> Cc: Johannes Berg <johannes@sipsolutions.net> Cc: Kees Cook <kees@kernel.org> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Madhavan Srinivasan <maddy@linux.ibm.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nicholas Piggin <npiggin@gmail.com> Cc: Ondrej Mosnacek <omosnace@redhat.com> Cc: Palmer Dabbelt <palmer@dabbelt.com> Cc: Pedro Falcato <pfalcato@suse.de> Cc: Richard Weinberger <richard@nod.at> Cc: Russell King <linux@armlinux.org.uk> Cc: Stephen Smalley <stephen.smalley.work@gmail.com> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Sven Schnelle <svens@linux.ibm.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Vasily Gorbik <gor@linux.ibm.com> Cc: Vineet Gupta <vgupta@kernel.org> Cc: WANG Xuerui <kernel@xen0n.name> Cc: Will Deacon <will@kernel.org> Cc: xu xin <xu.xin16@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
134 lines
3.5 KiB
C
134 lines
3.5 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Page management definitions for the Hexagon architecture
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*
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* Copyright (c) 2010-2013, The Linux Foundation. All rights reserved.
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*/
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#ifndef _ASM_PAGE_H
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#define _ASM_PAGE_H
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#include <linux/const.h>
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/* This is probably not the most graceful way to handle this. */
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#ifdef CONFIG_PAGE_SIZE_4KB
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_4KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_16KB
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_16KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_64KB
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_64KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_256KB
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_256KB
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#endif
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#ifdef CONFIG_PAGE_SIZE_1MB
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#define HEXAGON_L1_PTE_SIZE __HVM_PDE_S_1MB
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#endif
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/*
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* These should be defined in hugetlb.h, but apparently not.
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* "Huge" for us should be 4MB or 16MB, which are both represented
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* in L1 PTE's. Right now, it's set up for 4MB.
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*/
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#ifdef CONFIG_HUGETLB_PAGE
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#define HPAGE_SHIFT 22
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#define HPAGE_SIZE (1UL << HPAGE_SHIFT)
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#define HPAGE_MASK (~(HPAGE_SIZE-1))
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#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT-PAGE_SHIFT)
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#define HVM_HUGEPAGE_SIZE 0x5
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#endif
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#include <vdso/page.h>
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#ifdef __KERNEL__
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#ifndef __ASSEMBLY__
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/*
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* This is for PFN_DOWN, which mm.h needs. Seems the right place to pull it in.
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*/
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#include <linux/pfn.h>
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/*
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* We implement a two-level architecture-specific page table structure.
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* Null intermediate page table level (pmd, pud) definitions will come from
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* asm-generic/pagetable-nopmd.h and asm-generic/pagetable-nopud.h
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*/
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typedef struct { unsigned long pte; } pte_t;
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typedef struct { unsigned long pgd; } pgd_t;
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typedef struct { unsigned long pgprot; } pgprot_t;
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typedef struct page *pgtable_t;
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#define pte_val(x) ((x).pte)
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#define pgd_val(x) ((x).pgd)
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#define pgprot_val(x) ((x).pgprot)
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#define __pte(x) ((pte_t) { (x) })
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#define __pgd(x) ((pgd_t) { (x) })
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#define __pgprot(x) ((pgprot_t) { (x) })
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/* Needed for PAGE_OFFSET used in the macro right below */
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#include <asm/mem-layout.h>
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/*
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* We need a __pa and a __va routine for kernel space.
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* MIPS says they're only used during mem_init.
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* also, check if we need a PHYS_OFFSET.
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*/
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#define __pa(x) ((unsigned long)(x) - PAGE_OFFSET + PHYS_OFFSET)
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#define __va(x) ((void *)((unsigned long)(x) - PHYS_OFFSET + PAGE_OFFSET))
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/* The "page frame" descriptor is defined in linux/mm.h */
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struct page;
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/* Returns page frame descriptor for virtual address. */
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#define virt_to_page(kaddr) pfn_to_page(PFN_DOWN(__pa(kaddr)))
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/* Default vm area behavior is non-executable. */
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#define VMA_DATA_DEFAULT_FLAGS VMA_DATA_FLAGS_NON_EXEC
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#define virt_addr_valid(kaddr) pfn_valid(__pa(kaddr) >> PAGE_SHIFT)
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/* Need to not use a define for linesize; may move this to another file. */
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static inline void clear_page(void *page)
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{
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/* This can only be done on pages with L1 WB cache */
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asm volatile(
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" loop0(1f,%1);\n"
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"1: { dczeroa(%0);\n"
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" %0 = add(%0,#32); }:endloop0\n"
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: "+r" (page)
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: "r" (PAGE_SIZE/32)
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: "lc0", "sa0", "memory"
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);
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}
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#define copy_page(to, from) memcpy((to), (from), PAGE_SIZE)
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/*
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* Under assumption that kernel always "sees" user map...
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*/
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#define copy_user_page(to, from, vaddr, pg) copy_page(to, from)
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static inline unsigned long virt_to_pfn(const void *kaddr)
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{
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return __pa(kaddr) >> PAGE_SHIFT;
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}
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#define page_to_virt(page) __va(page_to_phys(page))
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#include <asm/mem-layout.h>
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#include <asm-generic/memory_model.h>
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/* XXX Todo: implement assembly-optimized version of getorder. */
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#include <asm-generic/getorder.h>
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#endif /* ifdef __ASSEMBLY__ */
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#endif /* ifdef __KERNEL__ */
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#endif
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