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From: Dave Hansen <dave.hansen@linux.intel.com> MPX is being removed from the kernel due to a lack of support in the toolchain going forward (gcc). This removes all the remaining (dead at this point) MPX handling code remaining in the tree. The only remaining code is the XSAVE support for MPX state which is currently needd for KVM to handle VMs which might use MPX. Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andy Lutomirski <luto@kernel.org> Cc: x86@kernel.org Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
211 lines
5 KiB
C
211 lines
5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* IA-32 Huge TLB Page Support for Kernel.
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*
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* Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
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*/
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#include <linux/init.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/sched/mm.h>
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#include <linux/hugetlb.h>
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#include <linux/pagemap.h>
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#include <linux/err.h>
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#include <linux/sysctl.h>
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#include <linux/compat.h>
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#include <asm/mman.h>
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#include <asm/tlb.h>
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#include <asm/tlbflush.h>
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#include <asm/pgalloc.h>
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#include <asm/elf.h>
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#if 0 /* This is just for testing */
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struct page *
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follow_huge_addr(struct mm_struct *mm, unsigned long address, int write)
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{
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unsigned long start = address;
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int length = 1;
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int nr;
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struct page *page;
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struct vm_area_struct *vma;
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vma = find_vma(mm, addr);
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if (!vma || !is_vm_hugetlb_page(vma))
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return ERR_PTR(-EINVAL);
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pte = huge_pte_offset(mm, address, vma_mmu_pagesize(vma));
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/* hugetlb should be locked, and hence, prefaulted */
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WARN_ON(!pte || pte_none(*pte));
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page = &pte_page(*pte)[vpfn % (HPAGE_SIZE/PAGE_SIZE)];
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WARN_ON(!PageHead(page));
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return page;
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}
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int pmd_huge(pmd_t pmd)
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{
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return 0;
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}
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int pud_huge(pud_t pud)
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{
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return 0;
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}
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#else
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/*
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* pmd_huge() returns 1 if @pmd is hugetlb related entry, that is normal
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* hugetlb entry or non-present (migration or hwpoisoned) hugetlb entry.
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* Otherwise, returns 0.
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*/
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int pmd_huge(pmd_t pmd)
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{
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return !pmd_none(pmd) &&
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(pmd_val(pmd) & (_PAGE_PRESENT|_PAGE_PSE)) != _PAGE_PRESENT;
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}
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int pud_huge(pud_t pud)
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{
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return !!(pud_val(pud) & _PAGE_PSE);
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}
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#endif
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#ifdef CONFIG_HUGETLB_PAGE
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static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
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unsigned long addr, unsigned long len,
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unsigned long pgoff, unsigned long flags)
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{
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struct hstate *h = hstate_file(file);
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struct vm_unmapped_area_info info;
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info.flags = 0;
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info.length = len;
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info.low_limit = get_mmap_base(1);
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/*
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* If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
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* in the full address space.
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*/
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info.high_limit = in_32bit_syscall() ?
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task_size_32bit() : task_size_64bit(addr > DEFAULT_MAP_WINDOW);
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info.align_mask = PAGE_MASK & ~huge_page_mask(h);
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info.align_offset = 0;
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return vm_unmapped_area(&info);
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}
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static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
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unsigned long addr, unsigned long len,
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unsigned long pgoff, unsigned long flags)
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{
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struct hstate *h = hstate_file(file);
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struct vm_unmapped_area_info info;
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info.flags = VM_UNMAPPED_AREA_TOPDOWN;
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info.length = len;
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info.low_limit = PAGE_SIZE;
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info.high_limit = get_mmap_base(0);
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/*
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* If hint address is above DEFAULT_MAP_WINDOW, look for unmapped area
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* in the full address space.
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*/
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if (addr > DEFAULT_MAP_WINDOW && !in_32bit_syscall())
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info.high_limit += TASK_SIZE_MAX - DEFAULT_MAP_WINDOW;
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info.align_mask = PAGE_MASK & ~huge_page_mask(h);
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info.align_offset = 0;
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addr = vm_unmapped_area(&info);
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/*
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* A failed mmap() very likely causes application failure,
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* so fall back to the bottom-up function here. This scenario
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* can happen with large stack limits and large mmap()
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* allocations.
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*/
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if (addr & ~PAGE_MASK) {
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VM_BUG_ON(addr != -ENOMEM);
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info.flags = 0;
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info.low_limit = TASK_UNMAPPED_BASE;
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info.high_limit = TASK_SIZE_LOW;
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addr = vm_unmapped_area(&info);
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}
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return addr;
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}
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unsigned long
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hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
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unsigned long len, unsigned long pgoff, unsigned long flags)
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{
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struct hstate *h = hstate_file(file);
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struct mm_struct *mm = current->mm;
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struct vm_area_struct *vma;
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if (len & ~huge_page_mask(h))
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return -EINVAL;
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if (len > TASK_SIZE)
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return -ENOMEM;
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/* No address checking. See comment at mmap_address_hint_valid() */
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if (flags & MAP_FIXED) {
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if (prepare_hugepage_range(file, addr, len))
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return -EINVAL;
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return addr;
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}
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if (addr) {
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addr &= huge_page_mask(h);
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if (!mmap_address_hint_valid(addr, len))
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goto get_unmapped_area;
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vma = find_vma(mm, addr);
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if (!vma || addr + len <= vm_start_gap(vma))
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return addr;
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}
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get_unmapped_area:
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if (mm->get_unmapped_area == arch_get_unmapped_area)
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return hugetlb_get_unmapped_area_bottomup(file, addr, len,
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pgoff, flags);
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else
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return hugetlb_get_unmapped_area_topdown(file, addr, len,
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pgoff, flags);
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}
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#endif /* CONFIG_HUGETLB_PAGE */
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#ifdef CONFIG_X86_64
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static __init int setup_hugepagesz(char *opt)
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{
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unsigned long ps = memparse(opt, &opt);
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if (ps == PMD_SIZE) {
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hugetlb_add_hstate(PMD_SHIFT - PAGE_SHIFT);
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} else if (ps == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES)) {
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hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
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} else {
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hugetlb_bad_size();
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printk(KERN_ERR "hugepagesz: Unsupported page size %lu M\n",
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ps >> 20);
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return 0;
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}
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return 1;
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}
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__setup("hugepagesz=", setup_hugepagesz);
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#ifdef CONFIG_CONTIG_ALLOC
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static __init int gigantic_pages_init(void)
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{
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/* With compaction or CMA we can allocate gigantic pages at runtime */
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if (boot_cpu_has(X86_FEATURE_GBPAGES) && !size_to_hstate(1UL << PUD_SHIFT))
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hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
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return 0;
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}
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arch_initcall(gigantic_pages_init);
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#endif
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#endif
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