757 lines
18 KiB
C
757 lines
18 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright IBM Corp. 2006
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*/
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#include <linux/memory_hotplug.h>
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#include <linux/memblock.h>
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#include <linux/pfn.h>
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#include <linux/mm.h>
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#include <linux/init.h>
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#include <linux/list.h>
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#include <linux/hugetlb.h>
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#include <linux/slab.h>
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#include <linux/sort.h>
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#include <asm/cacheflush.h>
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#include <asm/nospec-branch.h>
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#include <asm/pgalloc.h>
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#include <asm/setup.h>
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#include <asm/tlbflush.h>
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#include <asm/sections.h>
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#include <asm/set_memory.h>
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static DEFINE_MUTEX(vmem_mutex);
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static void __ref *vmem_alloc_pages(unsigned int order)
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{
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unsigned long size = PAGE_SIZE << order;
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if (slab_is_available())
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return (void *)__get_free_pages(GFP_KERNEL, order);
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return memblock_alloc(size, size);
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}
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static void vmem_free_pages(unsigned long addr, int order)
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{
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/* We don't expect boot memory to be removed ever. */
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if (!slab_is_available() ||
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WARN_ON_ONCE(PageReserved(virt_to_page(addr))))
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return;
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free_pages(addr, order);
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}
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void *vmem_crst_alloc(unsigned long val)
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{
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unsigned long *table;
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table = vmem_alloc_pages(CRST_ALLOC_ORDER);
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if (table)
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crst_table_init(table, val);
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return table;
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}
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pte_t __ref *vmem_pte_alloc(void)
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{
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unsigned long size = PTRS_PER_PTE * sizeof(pte_t);
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pte_t *pte;
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if (slab_is_available())
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pte = (pte_t *) page_table_alloc(&init_mm);
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else
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pte = (pte_t *) memblock_alloc(size, size);
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if (!pte)
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return NULL;
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memset64((u64 *)pte, _PAGE_INVALID, PTRS_PER_PTE);
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return pte;
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}
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static void vmem_pte_free(unsigned long *table)
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{
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/* We don't expect boot memory to be removed ever. */
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if (!slab_is_available() ||
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WARN_ON_ONCE(PageReserved(virt_to_page(table))))
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return;
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page_table_free(&init_mm, table);
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}
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#define PAGE_UNUSED 0xFD
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/*
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* The unused vmemmap range, which was not yet memset(PAGE_UNUSED) ranges
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* from unused_sub_pmd_start to next PMD_SIZE boundary.
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*/
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static unsigned long unused_sub_pmd_start;
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static void vmemmap_flush_unused_sub_pmd(void)
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{
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if (!unused_sub_pmd_start)
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return;
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memset((void *)unused_sub_pmd_start, PAGE_UNUSED,
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ALIGN(unused_sub_pmd_start, PMD_SIZE) - unused_sub_pmd_start);
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unused_sub_pmd_start = 0;
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}
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static void vmemmap_mark_sub_pmd_used(unsigned long start, unsigned long end)
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{
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/*
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* As we expect to add in the same granularity as we remove, it's
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* sufficient to mark only some piece used to block the memmap page from
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* getting removed (just in case the memmap never gets initialized,
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* e.g., because the memory block never gets onlined).
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*/
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memset((void *)start, 0, sizeof(struct page));
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}
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static void vmemmap_use_sub_pmd(unsigned long start, unsigned long end)
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{
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/*
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* We only optimize if the new used range directly follows the
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* previously unused range (esp., when populating consecutive sections).
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*/
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if (unused_sub_pmd_start == start) {
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unused_sub_pmd_start = end;
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if (likely(IS_ALIGNED(unused_sub_pmd_start, PMD_SIZE)))
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unused_sub_pmd_start = 0;
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return;
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}
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vmemmap_flush_unused_sub_pmd();
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vmemmap_mark_sub_pmd_used(start, end);
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}
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static void vmemmap_use_new_sub_pmd(unsigned long start, unsigned long end)
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{
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unsigned long page = ALIGN_DOWN(start, PMD_SIZE);
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vmemmap_flush_unused_sub_pmd();
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/* Could be our memmap page is filled with PAGE_UNUSED already ... */
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vmemmap_mark_sub_pmd_used(start, end);
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/* Mark the unused parts of the new memmap page PAGE_UNUSED. */
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if (!IS_ALIGNED(start, PMD_SIZE))
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memset((void *)page, PAGE_UNUSED, start - page);
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/*
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* We want to avoid memset(PAGE_UNUSED) when populating the vmemmap of
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* consecutive sections. Remember for the last added PMD the last
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* unused range in the populated PMD.
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*/
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if (!IS_ALIGNED(end, PMD_SIZE))
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unused_sub_pmd_start = end;
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}
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/* Returns true if the PMD is completely unused and can be freed. */
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static bool vmemmap_unuse_sub_pmd(unsigned long start, unsigned long end)
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{
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unsigned long page = ALIGN_DOWN(start, PMD_SIZE);
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vmemmap_flush_unused_sub_pmd();
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memset((void *)start, PAGE_UNUSED, end - start);
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return !memchr_inv((void *)page, PAGE_UNUSED, PMD_SIZE);
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}
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/* __ref: we'll only call vmemmap_alloc_block() via vmemmap_populate() */
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static int __ref modify_pte_table(pmd_t *pmd, unsigned long addr,
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unsigned long end, bool add, bool direct)
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{
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unsigned long prot, pages = 0;
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int ret = -ENOMEM;
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pte_t *pte;
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prot = pgprot_val(PAGE_KERNEL);
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if (!MACHINE_HAS_NX)
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prot &= ~_PAGE_NOEXEC;
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pte = pte_offset_kernel(pmd, addr);
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for (; addr < end; addr += PAGE_SIZE, pte++) {
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if (!add) {
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if (pte_none(*pte))
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continue;
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if (!direct)
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vmem_free_pages((unsigned long) pfn_to_virt(pte_pfn(*pte)), 0);
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pte_clear(&init_mm, addr, pte);
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} else if (pte_none(*pte)) {
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if (!direct) {
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void *new_page = vmemmap_alloc_block(PAGE_SIZE, NUMA_NO_NODE);
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if (!new_page)
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goto out;
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set_pte(pte, __pte(__pa(new_page) | prot));
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} else {
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set_pte(pte, __pte(__pa(addr) | prot));
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}
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} else {
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continue;
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}
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pages++;
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}
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ret = 0;
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out:
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if (direct)
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update_page_count(PG_DIRECT_MAP_4K, add ? pages : -pages);
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return ret;
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}
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static void try_free_pte_table(pmd_t *pmd, unsigned long start)
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{
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pte_t *pte;
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int i;
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/* We can safely assume this is fully in 1:1 mapping & vmemmap area */
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pte = pte_offset_kernel(pmd, start);
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for (i = 0; i < PTRS_PER_PTE; i++, pte++) {
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if (!pte_none(*pte))
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return;
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}
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vmem_pte_free((unsigned long *) pmd_deref(*pmd));
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pmd_clear(pmd);
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}
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/* __ref: we'll only call vmemmap_alloc_block() via vmemmap_populate() */
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static int __ref modify_pmd_table(pud_t *pud, unsigned long addr,
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unsigned long end, bool add, bool direct)
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{
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unsigned long next, prot, pages = 0;
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int ret = -ENOMEM;
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pmd_t *pmd;
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pte_t *pte;
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prot = pgprot_val(SEGMENT_KERNEL);
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if (!MACHINE_HAS_NX)
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prot &= ~_SEGMENT_ENTRY_NOEXEC;
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pmd = pmd_offset(pud, addr);
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for (; addr < end; addr = next, pmd++) {
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next = pmd_addr_end(addr, end);
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if (!add) {
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if (pmd_none(*pmd))
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continue;
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if (pmd_large(*pmd)) {
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if (IS_ALIGNED(addr, PMD_SIZE) &&
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IS_ALIGNED(next, PMD_SIZE)) {
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if (!direct)
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vmem_free_pages(pmd_deref(*pmd), get_order(PMD_SIZE));
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pmd_clear(pmd);
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pages++;
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} else if (!direct && vmemmap_unuse_sub_pmd(addr, next)) {
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vmem_free_pages(pmd_deref(*pmd), get_order(PMD_SIZE));
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pmd_clear(pmd);
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}
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continue;
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}
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} else if (pmd_none(*pmd)) {
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if (IS_ALIGNED(addr, PMD_SIZE) &&
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IS_ALIGNED(next, PMD_SIZE) &&
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MACHINE_HAS_EDAT1 && direct &&
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!debug_pagealloc_enabled()) {
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set_pmd(pmd, __pmd(__pa(addr) | prot));
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pages++;
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continue;
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} else if (!direct && MACHINE_HAS_EDAT1) {
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void *new_page;
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/*
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* Use 1MB frames for vmemmap if available. We
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* always use large frames even if they are only
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* partially used. Otherwise we would have also
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* page tables since vmemmap_populate gets
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* called for each section separately.
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*/
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new_page = vmemmap_alloc_block(PMD_SIZE, NUMA_NO_NODE);
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if (new_page) {
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set_pmd(pmd, __pmd(__pa(new_page) | prot));
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if (!IS_ALIGNED(addr, PMD_SIZE) ||
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!IS_ALIGNED(next, PMD_SIZE)) {
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vmemmap_use_new_sub_pmd(addr, next);
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}
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continue;
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}
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}
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pte = vmem_pte_alloc();
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if (!pte)
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goto out;
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pmd_populate(&init_mm, pmd, pte);
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} else if (pmd_large(*pmd)) {
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if (!direct)
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vmemmap_use_sub_pmd(addr, next);
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continue;
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}
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ret = modify_pte_table(pmd, addr, next, add, direct);
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if (ret)
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goto out;
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if (!add)
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try_free_pte_table(pmd, addr & PMD_MASK);
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}
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ret = 0;
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out:
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if (direct)
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update_page_count(PG_DIRECT_MAP_1M, add ? pages : -pages);
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return ret;
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}
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static void try_free_pmd_table(pud_t *pud, unsigned long start)
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{
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const unsigned long end = start + PUD_SIZE;
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pmd_t *pmd;
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int i;
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/* Don't mess with any tables not fully in 1:1 mapping & vmemmap area */
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if (end > VMALLOC_START)
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return;
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pmd = pmd_offset(pud, start);
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for (i = 0; i < PTRS_PER_PMD; i++, pmd++)
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if (!pmd_none(*pmd))
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return;
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vmem_free_pages(pud_deref(*pud), CRST_ALLOC_ORDER);
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pud_clear(pud);
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}
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static int modify_pud_table(p4d_t *p4d, unsigned long addr, unsigned long end,
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bool add, bool direct)
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{
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unsigned long next, prot, pages = 0;
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int ret = -ENOMEM;
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pud_t *pud;
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pmd_t *pmd;
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prot = pgprot_val(REGION3_KERNEL);
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if (!MACHINE_HAS_NX)
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prot &= ~_REGION_ENTRY_NOEXEC;
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pud = pud_offset(p4d, addr);
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for (; addr < end; addr = next, pud++) {
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next = pud_addr_end(addr, end);
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if (!add) {
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if (pud_none(*pud))
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continue;
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if (pud_large(*pud)) {
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if (IS_ALIGNED(addr, PUD_SIZE) &&
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IS_ALIGNED(next, PUD_SIZE)) {
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pud_clear(pud);
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pages++;
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}
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continue;
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}
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} else if (pud_none(*pud)) {
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if (IS_ALIGNED(addr, PUD_SIZE) &&
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IS_ALIGNED(next, PUD_SIZE) &&
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MACHINE_HAS_EDAT2 && direct &&
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!debug_pagealloc_enabled()) {
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set_pud(pud, __pud(__pa(addr) | prot));
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pages++;
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continue;
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}
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pmd = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
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if (!pmd)
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goto out;
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pud_populate(&init_mm, pud, pmd);
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} else if (pud_large(*pud)) {
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continue;
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}
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ret = modify_pmd_table(pud, addr, next, add, direct);
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if (ret)
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goto out;
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if (!add)
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try_free_pmd_table(pud, addr & PUD_MASK);
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}
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ret = 0;
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out:
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if (direct)
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update_page_count(PG_DIRECT_MAP_2G, add ? pages : -pages);
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return ret;
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}
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static void try_free_pud_table(p4d_t *p4d, unsigned long start)
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{
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const unsigned long end = start + P4D_SIZE;
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||
|
|
pud_t *pud;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Don't mess with any tables not fully in 1:1 mapping & vmemmap area */
|
||
|
|
if (end > VMALLOC_START)
|
||
|
|
return;
|
||
|
|
|
||
|
|
pud = pud_offset(p4d, start);
|
||
|
|
for (i = 0; i < PTRS_PER_PUD; i++, pud++) {
|
||
|
|
if (!pud_none(*pud))
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
vmem_free_pages(p4d_deref(*p4d), CRST_ALLOC_ORDER);
|
||
|
|
p4d_clear(p4d);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int modify_p4d_table(pgd_t *pgd, unsigned long addr, unsigned long end,
|
||
|
|
bool add, bool direct)
|
||
|
|
{
|
||
|
|
unsigned long next;
|
||
|
|
int ret = -ENOMEM;
|
||
|
|
p4d_t *p4d;
|
||
|
|
pud_t *pud;
|
||
|
|
|
||
|
|
p4d = p4d_offset(pgd, addr);
|
||
|
|
for (; addr < end; addr = next, p4d++) {
|
||
|
|
next = p4d_addr_end(addr, end);
|
||
|
|
if (!add) {
|
||
|
|
if (p4d_none(*p4d))
|
||
|
|
continue;
|
||
|
|
} else if (p4d_none(*p4d)) {
|
||
|
|
pud = vmem_crst_alloc(_REGION3_ENTRY_EMPTY);
|
||
|
|
if (!pud)
|
||
|
|
goto out;
|
||
|
|
p4d_populate(&init_mm, p4d, pud);
|
||
|
|
}
|
||
|
|
ret = modify_pud_table(p4d, addr, next, add, direct);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
if (!add)
|
||
|
|
try_free_pud_table(p4d, addr & P4D_MASK);
|
||
|
|
}
|
||
|
|
ret = 0;
|
||
|
|
out:
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void try_free_p4d_table(pgd_t *pgd, unsigned long start)
|
||
|
|
{
|
||
|
|
const unsigned long end = start + PGDIR_SIZE;
|
||
|
|
p4d_t *p4d;
|
||
|
|
int i;
|
||
|
|
|
||
|
|
/* Don't mess with any tables not fully in 1:1 mapping & vmemmap area */
|
||
|
|
if (end > VMALLOC_START)
|
||
|
|
return;
|
||
|
|
|
||
|
|
p4d = p4d_offset(pgd, start);
|
||
|
|
for (i = 0; i < PTRS_PER_P4D; i++, p4d++) {
|
||
|
|
if (!p4d_none(*p4d))
|
||
|
|
return;
|
||
|
|
}
|
||
|
|
vmem_free_pages(pgd_deref(*pgd), CRST_ALLOC_ORDER);
|
||
|
|
pgd_clear(pgd);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int modify_pagetable(unsigned long start, unsigned long end, bool add,
|
||
|
|
bool direct)
|
||
|
|
{
|
||
|
|
unsigned long addr, next;
|
||
|
|
int ret = -ENOMEM;
|
||
|
|
pgd_t *pgd;
|
||
|
|
p4d_t *p4d;
|
||
|
|
|
||
|
|
if (WARN_ON_ONCE(!PAGE_ALIGNED(start | end)))
|
||
|
|
return -EINVAL;
|
||
|
|
for (addr = start; addr < end; addr = next) {
|
||
|
|
next = pgd_addr_end(addr, end);
|
||
|
|
pgd = pgd_offset_k(addr);
|
||
|
|
|
||
|
|
if (!add) {
|
||
|
|
if (pgd_none(*pgd))
|
||
|
|
continue;
|
||
|
|
} else if (pgd_none(*pgd)) {
|
||
|
|
p4d = vmem_crst_alloc(_REGION2_ENTRY_EMPTY);
|
||
|
|
if (!p4d)
|
||
|
|
goto out;
|
||
|
|
pgd_populate(&init_mm, pgd, p4d);
|
||
|
|
}
|
||
|
|
ret = modify_p4d_table(pgd, addr, next, add, direct);
|
||
|
|
if (ret)
|
||
|
|
goto out;
|
||
|
|
if (!add)
|
||
|
|
try_free_p4d_table(pgd, addr & PGDIR_MASK);
|
||
|
|
}
|
||
|
|
ret = 0;
|
||
|
|
out:
|
||
|
|
if (!add)
|
||
|
|
flush_tlb_kernel_range(start, end);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
static int add_pagetable(unsigned long start, unsigned long end, bool direct)
|
||
|
|
{
|
||
|
|
return modify_pagetable(start, end, true, direct);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int remove_pagetable(unsigned long start, unsigned long end, bool direct)
|
||
|
|
{
|
||
|
|
return modify_pagetable(start, end, false, direct);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Add a physical memory range to the 1:1 mapping.
|
||
|
|
*/
|
||
|
|
static int vmem_add_range(unsigned long start, unsigned long size)
|
||
|
|
{
|
||
|
|
return add_pagetable(start, start + size, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Remove a physical memory range from the 1:1 mapping.
|
||
|
|
*/
|
||
|
|
static void vmem_remove_range(unsigned long start, unsigned long size)
|
||
|
|
{
|
||
|
|
remove_pagetable(start, start + size, true);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Add a backed mem_map array to the virtual mem_map array.
|
||
|
|
*/
|
||
|
|
int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
|
||
|
|
struct vmem_altmap *altmap)
|
||
|
|
{
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
mutex_lock(&vmem_mutex);
|
||
|
|
/* We don't care about the node, just use NUMA_NO_NODE on allocations */
|
||
|
|
ret = add_pagetable(start, end, false);
|
||
|
|
if (ret)
|
||
|
|
remove_pagetable(start, end, false);
|
||
|
|
mutex_unlock(&vmem_mutex);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
void vmemmap_free(unsigned long start, unsigned long end,
|
||
|
|
struct vmem_altmap *altmap)
|
||
|
|
{
|
||
|
|
mutex_lock(&vmem_mutex);
|
||
|
|
remove_pagetable(start, end, false);
|
||
|
|
mutex_unlock(&vmem_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
void vmem_remove_mapping(unsigned long start, unsigned long size)
|
||
|
|
{
|
||
|
|
mutex_lock(&vmem_mutex);
|
||
|
|
vmem_remove_range(start, size);
|
||
|
|
mutex_unlock(&vmem_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
struct range arch_get_mappable_range(void)
|
||
|
|
{
|
||
|
|
struct range mhp_range;
|
||
|
|
|
||
|
|
mhp_range.start = 0;
|
||
|
|
mhp_range.end = VMEM_MAX_PHYS - 1;
|
||
|
|
return mhp_range;
|
||
|
|
}
|
||
|
|
|
||
|
|
int vmem_add_mapping(unsigned long start, unsigned long size)
|
||
|
|
{
|
||
|
|
struct range range = arch_get_mappable_range();
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
if (start < range.start ||
|
||
|
|
start + size > range.end + 1 ||
|
||
|
|
start + size < start)
|
||
|
|
return -ERANGE;
|
||
|
|
|
||
|
|
mutex_lock(&vmem_mutex);
|
||
|
|
ret = vmem_add_range(start, size);
|
||
|
|
if (ret)
|
||
|
|
vmem_remove_range(start, size);
|
||
|
|
mutex_unlock(&vmem_mutex);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Allocate new or return existing page-table entry, but do not map it
|
||
|
|
* to any physical address. If missing, allocate segment- and region-
|
||
|
|
* table entries along. Meeting a large segment- or region-table entry
|
||
|
|
* while traversing is an error, since the function is expected to be
|
||
|
|
* called against virtual regions reserverd for 4KB mappings only.
|
||
|
|
*/
|
||
|
|
pte_t *vmem_get_alloc_pte(unsigned long addr, bool alloc)
|
||
|
|
{
|
||
|
|
pte_t *ptep = NULL;
|
||
|
|
pgd_t *pgd;
|
||
|
|
p4d_t *p4d;
|
||
|
|
pud_t *pud;
|
||
|
|
pmd_t *pmd;
|
||
|
|
pte_t *pte;
|
||
|
|
|
||
|
|
pgd = pgd_offset_k(addr);
|
||
|
|
if (pgd_none(*pgd)) {
|
||
|
|
if (!alloc)
|
||
|
|
goto out;
|
||
|
|
p4d = vmem_crst_alloc(_REGION2_ENTRY_EMPTY);
|
||
|
|
if (!p4d)
|
||
|
|
goto out;
|
||
|
|
pgd_populate(&init_mm, pgd, p4d);
|
||
|
|
}
|
||
|
|
p4d = p4d_offset(pgd, addr);
|
||
|
|
if (p4d_none(*p4d)) {
|
||
|
|
if (!alloc)
|
||
|
|
goto out;
|
||
|
|
pud = vmem_crst_alloc(_REGION3_ENTRY_EMPTY);
|
||
|
|
if (!pud)
|
||
|
|
goto out;
|
||
|
|
p4d_populate(&init_mm, p4d, pud);
|
||
|
|
}
|
||
|
|
pud = pud_offset(p4d, addr);
|
||
|
|
if (pud_none(*pud)) {
|
||
|
|
if (!alloc)
|
||
|
|
goto out;
|
||
|
|
pmd = vmem_crst_alloc(_SEGMENT_ENTRY_EMPTY);
|
||
|
|
if (!pmd)
|
||
|
|
goto out;
|
||
|
|
pud_populate(&init_mm, pud, pmd);
|
||
|
|
} else if (WARN_ON_ONCE(pud_large(*pud))) {
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
pmd = pmd_offset(pud, addr);
|
||
|
|
if (pmd_none(*pmd)) {
|
||
|
|
if (!alloc)
|
||
|
|
goto out;
|
||
|
|
pte = vmem_pte_alloc();
|
||
|
|
if (!pte)
|
||
|
|
goto out;
|
||
|
|
pmd_populate(&init_mm, pmd, pte);
|
||
|
|
} else if (WARN_ON_ONCE(pmd_large(*pmd))) {
|
||
|
|
goto out;
|
||
|
|
}
|
||
|
|
ptep = pte_offset_kernel(pmd, addr);
|
||
|
|
out:
|
||
|
|
return ptep;
|
||
|
|
}
|
||
|
|
|
||
|
|
int __vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot, bool alloc)
|
||
|
|
{
|
||
|
|
pte_t *ptep, pte;
|
||
|
|
|
||
|
|
if (!IS_ALIGNED(addr, PAGE_SIZE))
|
||
|
|
return -EINVAL;
|
||
|
|
ptep = vmem_get_alloc_pte(addr, alloc);
|
||
|
|
if (!ptep)
|
||
|
|
return -ENOMEM;
|
||
|
|
__ptep_ipte(addr, ptep, 0, 0, IPTE_GLOBAL);
|
||
|
|
pte = mk_pte_phys(phys, prot);
|
||
|
|
set_pte(ptep, pte);
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
int vmem_map_4k_page(unsigned long addr, unsigned long phys, pgprot_t prot)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
mutex_lock(&vmem_mutex);
|
||
|
|
rc = __vmem_map_4k_page(addr, phys, prot, true);
|
||
|
|
mutex_unlock(&vmem_mutex);
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
void vmem_unmap_4k_page(unsigned long addr)
|
||
|
|
{
|
||
|
|
pte_t *ptep;
|
||
|
|
|
||
|
|
mutex_lock(&vmem_mutex);
|
||
|
|
ptep = virt_to_kpte(addr);
|
||
|
|
__ptep_ipte(addr, ptep, 0, 0, IPTE_GLOBAL);
|
||
|
|
pte_clear(&init_mm, addr, ptep);
|
||
|
|
mutex_unlock(&vmem_mutex);
|
||
|
|
}
|
||
|
|
|
||
|
|
static int __init memblock_region_cmp(const void *a, const void *b)
|
||
|
|
{
|
||
|
|
const struct memblock_region *r1 = a;
|
||
|
|
const struct memblock_region *r2 = b;
|
||
|
|
|
||
|
|
if (r1->base < r2->base)
|
||
|
|
return -1;
|
||
|
|
if (r1->base > r2->base)
|
||
|
|
return 1;
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void __init memblock_region_swap(void *a, void *b, int size)
|
||
|
|
{
|
||
|
|
swap(*(struct memblock_region *)a, *(struct memblock_region *)b);
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* map whole physical memory to virtual memory (identity mapping)
|
||
|
|
* we reserve enough space in the vmalloc area for vmemmap to hotplug
|
||
|
|
* additional memory segments.
|
||
|
|
*/
|
||
|
|
void __init vmem_map_init(void)
|
||
|
|
{
|
||
|
|
struct memblock_region memory_rwx_regions[] = {
|
||
|
|
{
|
||
|
|
.base = 0,
|
||
|
|
.size = sizeof(struct lowcore),
|
||
|
|
.flags = MEMBLOCK_NONE,
|
||
|
|
#ifdef CONFIG_NUMA
|
||
|
|
.nid = NUMA_NO_NODE,
|
||
|
|
#endif
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.base = __pa(_stext),
|
||
|
|
.size = _etext - _stext,
|
||
|
|
.flags = MEMBLOCK_NONE,
|
||
|
|
#ifdef CONFIG_NUMA
|
||
|
|
.nid = NUMA_NO_NODE,
|
||
|
|
#endif
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.base = __pa(_sinittext),
|
||
|
|
.size = _einittext - _sinittext,
|
||
|
|
.flags = MEMBLOCK_NONE,
|
||
|
|
#ifdef CONFIG_NUMA
|
||
|
|
.nid = NUMA_NO_NODE,
|
||
|
|
#endif
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.base = __stext_amode31,
|
||
|
|
.size = __etext_amode31 - __stext_amode31,
|
||
|
|
.flags = MEMBLOCK_NONE,
|
||
|
|
#ifdef CONFIG_NUMA
|
||
|
|
.nid = NUMA_NO_NODE,
|
||
|
|
#endif
|
||
|
|
},
|
||
|
|
};
|
||
|
|
struct memblock_type memory_rwx = {
|
||
|
|
.regions = memory_rwx_regions,
|
||
|
|
.cnt = ARRAY_SIZE(memory_rwx_regions),
|
||
|
|
.max = ARRAY_SIZE(memory_rwx_regions),
|
||
|
|
};
|
||
|
|
phys_addr_t base, end;
|
||
|
|
u64 i;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Set RW+NX attribute on all memory, except regions enumerated with
|
||
|
|
* memory_rwx exclude type. These regions need different attributes,
|
||
|
|
* which are enforced afterwards.
|
||
|
|
*
|
||
|
|
* __for_each_mem_range() iterate and exclude types should be sorted.
|
||
|
|
* The relative location of _stext and _sinittext is hardcoded in the
|
||
|
|
* linker script. However a location of __stext_amode31 and the kernel
|
||
|
|
* image itself are chosen dynamically. Thus, sort the exclude type.
|
||
|
|
*/
|
||
|
|
sort(&memory_rwx_regions,
|
||
|
|
ARRAY_SIZE(memory_rwx_regions), sizeof(memory_rwx_regions[0]),
|
||
|
|
memblock_region_cmp, memblock_region_swap);
|
||
|
|
__for_each_mem_range(i, &memblock.memory, &memory_rwx,
|
||
|
|
NUMA_NO_NODE, MEMBLOCK_NONE, &base, &end, NULL) {
|
||
|
|
__set_memory((unsigned long)__va(base),
|
||
|
|
(end - base) >> PAGE_SHIFT,
|
||
|
|
SET_MEMORY_RW | SET_MEMORY_NX);
|
||
|
|
}
|
||
|
|
|
||
|
|
__set_memory((unsigned long)_stext,
|
||
|
|
(unsigned long)(_etext - _stext) >> PAGE_SHIFT,
|
||
|
|
SET_MEMORY_RO | SET_MEMORY_X);
|
||
|
|
__set_memory((unsigned long)_etext,
|
||
|
|
(unsigned long)(__end_rodata - _etext) >> PAGE_SHIFT,
|
||
|
|
SET_MEMORY_RO);
|
||
|
|
__set_memory((unsigned long)_sinittext,
|
||
|
|
(unsigned long)(_einittext - _sinittext) >> PAGE_SHIFT,
|
||
|
|
SET_MEMORY_RO | SET_MEMORY_X);
|
||
|
|
__set_memory(__stext_amode31,
|
||
|
|
(__etext_amode31 - __stext_amode31) >> PAGE_SHIFT,
|
||
|
|
SET_MEMORY_RO | SET_MEMORY_X);
|
||
|
|
|
||
|
|
/* lowcore must be executable for LPSWE */
|
||
|
|
if (static_key_enabled(&cpu_has_bear))
|
||
|
|
set_memory_nx(0, 1);
|
||
|
|
set_memory_nx(PAGE_SIZE, 1);
|
||
|
|
|
||
|
|
pr_info("Write protected kernel read-only data: %luk\n",
|
||
|
|
(unsigned long)(__end_rodata - _stext) >> 10);
|
||
|
|
}
|