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Diffstat (limited to 'arch/arm64/mm/mmu.c')
-rw-r--r--arch/arm64/mm/mmu.c127
1 files changed, 83 insertions, 44 deletions
diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index b98f89420713..34e5d78af076 100644
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -26,6 +26,7 @@
#include <linux/set_memory.h>
#include <linux/kfence.h>
#include <linux/pkeys.h>
+#include <linux/mm_inline.h>
#include <asm/barrier.h>
#include <asm/cputype.h>
@@ -46,6 +47,13 @@
#define NO_CONT_MAPPINGS BIT(1)
#define NO_EXEC_MAPPINGS BIT(2) /* assumes FEAT_HPDS is not used */
+enum pgtable_type {
+ TABLE_PTE,
+ TABLE_PMD,
+ TABLE_PUD,
+ TABLE_P4D,
+};
+
u64 kimage_voffset __ro_after_init;
EXPORT_SYMBOL(kimage_voffset);
@@ -107,7 +115,7 @@ pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn,
}
EXPORT_SYMBOL(phys_mem_access_prot);
-static phys_addr_t __init early_pgtable_alloc(int shift)
+static phys_addr_t __init early_pgtable_alloc(enum pgtable_type pgtable_type)
{
phys_addr_t phys;
@@ -192,7 +200,7 @@ static void init_pte(pte_t *ptep, unsigned long addr, unsigned long end,
static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
unsigned long end, phys_addr_t phys,
pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int),
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type),
int flags)
{
unsigned long next;
@@ -207,7 +215,7 @@ static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
if (flags & NO_EXEC_MAPPINGS)
pmdval |= PMD_TABLE_PXN;
BUG_ON(!pgtable_alloc);
- pte_phys = pgtable_alloc(PAGE_SHIFT);
+ pte_phys = pgtable_alloc(TABLE_PTE);
ptep = pte_set_fixmap(pte_phys);
init_clear_pgtable(ptep);
ptep += pte_index(addr);
@@ -243,7 +251,7 @@ static void alloc_init_cont_pte(pmd_t *pmdp, unsigned long addr,
static void init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int), int flags)
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type), int flags)
{
unsigned long next;
@@ -277,7 +285,8 @@ static void init_pmd(pmd_t *pmdp, unsigned long addr, unsigned long end,
static void alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
unsigned long end, phys_addr_t phys,
pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int), int flags)
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+ int flags)
{
unsigned long next;
pud_t pud = READ_ONCE(*pudp);
@@ -294,7 +303,7 @@ static void alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
if (flags & NO_EXEC_MAPPINGS)
pudval |= PUD_TABLE_PXN;
BUG_ON(!pgtable_alloc);
- pmd_phys = pgtable_alloc(PMD_SHIFT);
+ pmd_phys = pgtable_alloc(TABLE_PMD);
pmdp = pmd_set_fixmap(pmd_phys);
init_clear_pgtable(pmdp);
pmdp += pmd_index(addr);
@@ -325,7 +334,7 @@ static void alloc_init_cont_pmd(pud_t *pudp, unsigned long addr,
static void alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int),
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type),
int flags)
{
unsigned long next;
@@ -339,7 +348,7 @@ static void alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
if (flags & NO_EXEC_MAPPINGS)
p4dval |= P4D_TABLE_PXN;
BUG_ON(!pgtable_alloc);
- pud_phys = pgtable_alloc(PUD_SHIFT);
+ pud_phys = pgtable_alloc(TABLE_PUD);
pudp = pud_set_fixmap(pud_phys);
init_clear_pgtable(pudp);
pudp += pud_index(addr);
@@ -383,7 +392,7 @@ static void alloc_init_pud(p4d_t *p4dp, unsigned long addr, unsigned long end,
static void alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
phys_addr_t phys, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int),
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type),
int flags)
{
unsigned long next;
@@ -397,7 +406,7 @@ static void alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
if (flags & NO_EXEC_MAPPINGS)
pgdval |= PGD_TABLE_PXN;
BUG_ON(!pgtable_alloc);
- p4d_phys = pgtable_alloc(P4D_SHIFT);
+ p4d_phys = pgtable_alloc(TABLE_P4D);
p4dp = p4d_set_fixmap(p4d_phys);
init_clear_pgtable(p4dp);
p4dp += p4d_index(addr);
@@ -427,7 +436,7 @@ static void alloc_init_p4d(pgd_t *pgdp, unsigned long addr, unsigned long end,
static void __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int),
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type),
int flags)
{
unsigned long addr, end, next;
@@ -455,7 +464,7 @@ static void __create_pgd_mapping_locked(pgd_t *pgdir, phys_addr_t phys,
static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
unsigned long virt, phys_addr_t size,
pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int),
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type),
int flags)
{
mutex_lock(&fixmap_lock);
@@ -468,37 +477,48 @@ static void __create_pgd_mapping(pgd_t *pgdir, phys_addr_t phys,
extern __alias(__create_pgd_mapping_locked)
void create_kpti_ng_temp_pgd(pgd_t *pgdir, phys_addr_t phys, unsigned long virt,
phys_addr_t size, pgprot_t prot,
- phys_addr_t (*pgtable_alloc)(int), int flags);
+ phys_addr_t (*pgtable_alloc)(enum pgtable_type),
+ int flags);
#endif
-static phys_addr_t __pgd_pgtable_alloc(int shift)
+static phys_addr_t __pgd_pgtable_alloc(struct mm_struct *mm,
+ enum pgtable_type pgtable_type)
{
/* Page is zeroed by init_clear_pgtable() so don't duplicate effort. */
- void *ptr = (void *)__get_free_page(GFP_PGTABLE_KERNEL & ~__GFP_ZERO);
+ struct ptdesc *ptdesc = pagetable_alloc(GFP_PGTABLE_KERNEL & ~__GFP_ZERO, 0);
+ phys_addr_t pa;
+
+ BUG_ON(!ptdesc);
+ pa = page_to_phys(ptdesc_page(ptdesc));
+
+ switch (pgtable_type) {
+ case TABLE_PTE:
+ BUG_ON(!pagetable_pte_ctor(mm, ptdesc));
+ break;
+ case TABLE_PMD:
+ BUG_ON(!pagetable_pmd_ctor(mm, ptdesc));
+ break;
+ case TABLE_PUD:
+ pagetable_pud_ctor(ptdesc);
+ break;
+ case TABLE_P4D:
+ pagetable_p4d_ctor(ptdesc);
+ break;
+ }
- BUG_ON(!ptr);
- return __pa(ptr);
+ return pa;
}
-static phys_addr_t pgd_pgtable_alloc(int shift)
+static phys_addr_t __maybe_unused
+pgd_pgtable_alloc_init_mm(enum pgtable_type pgtable_type)
{
- phys_addr_t pa = __pgd_pgtable_alloc(shift);
- struct ptdesc *ptdesc = page_ptdesc(phys_to_page(pa));
-
- /*
- * Call proper page table ctor in case later we need to
- * call core mm functions like apply_to_page_range() on
- * this pre-allocated page table.
- *
- * We don't select ARCH_ENABLE_SPLIT_PMD_PTLOCK if pmd is
- * folded, and if so pagetable_pte_ctor() becomes nop.
- */
- if (shift == PAGE_SHIFT)
- BUG_ON(!pagetable_pte_ctor(ptdesc));
- else if (shift == PMD_SHIFT)
- BUG_ON(!pagetable_pmd_ctor(ptdesc));
+ return __pgd_pgtable_alloc(&init_mm, pgtable_type);
+}
- return pa;
+static phys_addr_t
+pgd_pgtable_alloc_special_mm(enum pgtable_type pgtable_type)
+{
+ return __pgd_pgtable_alloc(NULL, pgtable_type);
}
/*
@@ -530,7 +550,7 @@ void __init create_pgd_mapping(struct mm_struct *mm, phys_addr_t phys,
flags = NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
__create_pgd_mapping(mm->pgd, phys, virt, size, prot,
- pgd_pgtable_alloc, flags);
+ pgd_pgtable_alloc_special_mm, flags);
}
static void update_mapping_prot(phys_addr_t phys, unsigned long virt,
@@ -744,7 +764,7 @@ static int __init map_entry_trampoline(void)
memset(tramp_pg_dir, 0, PGD_SIZE);
__create_pgd_mapping(tramp_pg_dir, pa_start, TRAMP_VALIAS,
entry_tramp_text_size(), prot,
- __pgd_pgtable_alloc, NO_BLOCK_MAPPINGS);
+ pgd_pgtable_alloc_init_mm, NO_BLOCK_MAPPINGS);
/* Map both the text and data into the kernel page table */
for (i = 0; i < DIV_ROUND_UP(entry_tramp_text_size(), PAGE_SIZE); i++)
@@ -1286,7 +1306,8 @@ int pud_free_pmd_page(pud_t *pudp, unsigned long addr)
next = addr;
end = addr + PUD_SIZE;
do {
- pmd_free_pte_page(pmdp, next);
+ if (pmd_present(pmdp_get(pmdp)))
+ pmd_free_pte_page(pmdp, next);
} while (pmdp++, next += PMD_SIZE, next != end);
pud_clear(pudp);
@@ -1350,7 +1371,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
flags |= NO_BLOCK_MAPPINGS | NO_CONT_MAPPINGS;
__create_pgd_mapping(swapper_pg_dir, start, __phys_to_virt(start),
- size, params->pgprot, __pgd_pgtable_alloc,
+ size, params->pgprot, pgd_pgtable_alloc_init_mm,
flags);
memblock_clear_nomap(start, size);
@@ -1361,7 +1382,8 @@ int arch_add_memory(int nid, u64 start, u64 size,
__remove_pgd_mapping(swapper_pg_dir,
__phys_to_virt(start), size);
else {
- max_pfn = PFN_UP(start + size);
+ /* Address of hotplugged memory can be smaller */
+ max_pfn = max(max_pfn, PFN_UP(start + size));
max_low_pfn = max_pfn;
}
@@ -1503,24 +1525,41 @@ static int __init prevent_bootmem_remove_init(void)
early_initcall(prevent_bootmem_remove_init);
#endif
-pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
+pte_t modify_prot_start_ptes(struct vm_area_struct *vma, unsigned long addr,
+ pte_t *ptep, unsigned int nr)
{
+ pte_t pte = get_and_clear_ptes(vma->vm_mm, addr, ptep, nr);
+
if (alternative_has_cap_unlikely(ARM64_WORKAROUND_2645198)) {
/*
* Break-before-make (BBM) is required for all user space mappings
* when the permission changes from executable to non-executable
* in cases where cpu is affected with errata #2645198.
*/
- if (pte_user_exec(ptep_get(ptep)))
- return ptep_clear_flush(vma, addr, ptep);
+ if (pte_accessible(vma->vm_mm, pte) && pte_user_exec(pte))
+ __flush_tlb_range(vma, addr, nr * PAGE_SIZE,
+ PAGE_SIZE, true, 3);
}
- return ptep_get_and_clear(vma->vm_mm, addr, ptep);
+
+ return pte;
+}
+
+pte_t ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep)
+{
+ return modify_prot_start_ptes(vma, addr, ptep, 1);
+}
+
+void modify_prot_commit_ptes(struct vm_area_struct *vma, unsigned long addr,
+ pte_t *ptep, pte_t old_pte, pte_t pte,
+ unsigned int nr)
+{
+ set_ptes(vma->vm_mm, addr, ptep, pte, nr);
}
void ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep,
pte_t old_pte, pte_t pte)
{
- set_pte_at(vma->vm_mm, addr, ptep, pte);
+ modify_prot_commit_ptes(vma, addr, ptep, old_pte, pte, 1);
}
/*
generated by cgit (git 2.34.1) at 2025-08-06 01:06:25 +0000