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authorLinus Torvalds <torvalds@linux-foundation.org>2017-05-02 09:54:56 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-05-02 09:54:56 +0300
commitd3b5d35290d729a2518af00feca867385a1b08fa (patch)
tree7b56c0863d59bc57f7c7dcf5d5665c56b05f1d1b /arch/x86/mm
parentaa2a4b6569d5b10491b606a86e574dff3852597a (diff)
parent71389703839ebe9cb426c72d5f0bd549592e583c (diff)
downloadlinux-d3b5d35290d729a2518af00feca867385a1b08fa.tar.xz
Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 mm updates from Ingo Molnar: "The main x86 MM changes in this cycle were: - continued native kernel PCID support preparation patches to the TLB flushing code (Andy Lutomirski) - various fixes related to 32-bit compat syscall returning address over 4Gb in applications, launched from 64-bit binaries - motivated by C/R frameworks such as Virtuozzo. (Dmitry Safonov) - continued Intel 5-level paging enablement: in particular the conversion of x86 GUP to the generic GUP code. (Kirill A. Shutemov) - x86/mpx ABI corner case fixes/enhancements (Joerg Roedel) - ... plus misc updates, fixes and cleanups" * 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (62 commits) mm, zone_device: Replace {get, put}_zone_device_page() with a single reference to fix pmem crash x86/mm: Fix flush_tlb_page() on Xen x86/mm: Make flush_tlb_mm_range() more predictable x86/mm: Remove flush_tlb() and flush_tlb_current_task() x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly() x86/mm/64: Fix crash in remove_pagetable() Revert "x86/mm/gup: Switch GUP to the generic get_user_page_fast() implementation" x86/boot/e820: Remove a redundant self assignment x86/mm: Fix dump pagetables for 4 levels of page tables x86/mpx, selftests: Only check bounds-vs-shadow when we keep shadow x86/mpx: Correctly report do_mpx_bt_fault() failures to user-space Revert "x86/mm/numa: Remove numa_nodemask_from_meminfo()" x86/espfix: Add support for 5-level paging x86/kasan: Extend KASAN to support 5-level paging x86/mm: Add basic defines/helpers for CONFIG_X86_5LEVEL=y x86/paravirt: Add 5-level support to the paravirt code x86/mm: Define virtual memory map for 5-level paging x86/asm: Remove __VIRTUAL_MASK_SHIFT==47 assert x86/boot: Detect 5-level paging support x86/mm/numa: Remove numa_nodemask_from_meminfo() ...
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/dump_pagetables.c59
-rw-r--r--arch/x86/mm/fault.c66
-rw-r--r--arch/x86/mm/gup.c33
-rw-r--r--arch/x86/mm/hugetlbpage.c9
-rw-r--r--arch/x86/mm/ident_map.c51
-rw-r--r--arch/x86/mm/init_32.c68
-rw-r--r--arch/x86/mm/init_64.c185
-rw-r--r--arch/x86/mm/ioremap.c3
-rw-r--r--arch/x86/mm/kasan_init_64.c33
-rw-r--r--arch/x86/mm/mmap.c125
-rw-r--r--arch/x86/mm/mpx.c10
-rw-r--r--arch/x86/mm/numa.c4
-rw-r--r--arch/x86/mm/pageattr.c54
-rw-r--r--arch/x86/mm/pgtable.c36
-rw-r--r--arch/x86/mm/pgtable_32.c8
-rw-r--r--arch/x86/mm/tlb.c33
16 files changed, 561 insertions, 216 deletions
diff --git a/arch/x86/mm/dump_pagetables.c b/arch/x86/mm/dump_pagetables.c
index 58b5bee7ea27..bce6990b1d81 100644
--- a/arch/x86/mm/dump_pagetables.c
+++ b/arch/x86/mm/dump_pagetables.c
@@ -110,7 +110,8 @@ static struct addr_marker address_markers[] = {
#define PTE_LEVEL_MULT (PAGE_SIZE)
#define PMD_LEVEL_MULT (PTRS_PER_PTE * PTE_LEVEL_MULT)
#define PUD_LEVEL_MULT (PTRS_PER_PMD * PMD_LEVEL_MULT)
-#define PGD_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
+#define P4D_LEVEL_MULT (PTRS_PER_PUD * PUD_LEVEL_MULT)
+#define PGD_LEVEL_MULT (PTRS_PER_P4D * P4D_LEVEL_MULT)
#define pt_dump_seq_printf(m, to_dmesg, fmt, args...) \
({ \
@@ -286,14 +287,13 @@ static void note_page(struct seq_file *m, struct pg_state *st,
}
}
-static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
- unsigned long P)
+static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr, unsigned long P)
{
int i;
pte_t *start;
pgprotval_t prot;
- start = (pte_t *) pmd_page_vaddr(addr);
+ start = (pte_t *)pmd_page_vaddr(addr);
for (i = 0; i < PTRS_PER_PTE; i++) {
prot = pte_flags(*start);
st->current_address = normalize_addr(P + i * PTE_LEVEL_MULT);
@@ -304,14 +304,13 @@ static void walk_pte_level(struct seq_file *m, struct pg_state *st, pmd_t addr,
#if PTRS_PER_PMD > 1
-static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr,
- unsigned long P)
+static void walk_pmd_level(struct seq_file *m, struct pg_state *st, pud_t addr, unsigned long P)
{
int i;
pmd_t *start;
pgprotval_t prot;
- start = (pmd_t *) pud_page_vaddr(addr);
+ start = (pmd_t *)pud_page_vaddr(addr);
for (i = 0; i < PTRS_PER_PMD; i++) {
st->current_address = normalize_addr(P + i * PMD_LEVEL_MULT);
if (!pmd_none(*start)) {
@@ -347,15 +346,14 @@ static bool pud_already_checked(pud_t *prev_pud, pud_t *pud, bool checkwx)
return checkwx && prev_pud && (pud_val(*prev_pud) == pud_val(*pud));
}
-static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
- unsigned long P)
+static void walk_pud_level(struct seq_file *m, struct pg_state *st, p4d_t addr, unsigned long P)
{
int i;
pud_t *start;
pgprotval_t prot;
pud_t *prev_pud = NULL;
- start = (pud_t *) pgd_page_vaddr(addr);
+ start = (pud_t *)p4d_page_vaddr(addr);
for (i = 0; i < PTRS_PER_PUD; i++) {
st->current_address = normalize_addr(P + i * PUD_LEVEL_MULT);
@@ -377,9 +375,42 @@ static void walk_pud_level(struct seq_file *m, struct pg_state *st, pgd_t addr,
}
#else
-#define walk_pud_level(m,s,a,p) walk_pmd_level(m,s,__pud(pgd_val(a)),p)
-#define pgd_large(a) pud_large(__pud(pgd_val(a)))
-#define pgd_none(a) pud_none(__pud(pgd_val(a)))
+#define walk_pud_level(m,s,a,p) walk_pmd_level(m,s,__pud(p4d_val(a)),p)
+#define p4d_large(a) pud_large(__pud(p4d_val(a)))
+#define p4d_none(a) pud_none(__pud(p4d_val(a)))
+#endif
+
+#if PTRS_PER_P4D > 1
+
+static void walk_p4d_level(struct seq_file *m, struct pg_state *st, pgd_t addr, unsigned long P)
+{
+ int i;
+ p4d_t *start;
+ pgprotval_t prot;
+
+ start = (p4d_t *)pgd_page_vaddr(addr);
+
+ for (i = 0; i < PTRS_PER_P4D; i++) {
+ st->current_address = normalize_addr(P + i * P4D_LEVEL_MULT);
+ if (!p4d_none(*start)) {
+ if (p4d_large(*start) || !p4d_present(*start)) {
+ prot = p4d_flags(*start);
+ note_page(m, st, __pgprot(prot), 2);
+ } else {
+ walk_pud_level(m, st, *start,
+ P + i * P4D_LEVEL_MULT);
+ }
+ } else
+ note_page(m, st, __pgprot(0), 2);
+
+ start++;
+ }
+}
+
+#else
+#define walk_p4d_level(m,s,a,p) walk_pud_level(m,s,__p4d(pgd_val(a)),p)
+#define pgd_large(a) p4d_large(__p4d(pgd_val(a)))
+#define pgd_none(a) p4d_none(__p4d(pgd_val(a)))
#endif
static inline bool is_hypervisor_range(int idx)
@@ -424,7 +455,7 @@ static void ptdump_walk_pgd_level_core(struct seq_file *m, pgd_t *pgd,
prot = pgd_flags(*start);
note_page(m, &st, __pgprot(prot), 1);
} else {
- walk_pud_level(m, &st, *start,
+ walk_p4d_level(m, &st, *start,
i * PGD_LEVEL_MULT);
}
} else
diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index 428e31763cb9..8ad91a01cbc8 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -253,6 +253,7 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
{
unsigned index = pgd_index(address);
pgd_t *pgd_k;
+ p4d_t *p4d, *p4d_k;
pud_t *pud, *pud_k;
pmd_t *pmd, *pmd_k;
@@ -265,10 +266,15 @@ static inline pmd_t *vmalloc_sync_one(pgd_t *pgd, unsigned long address)
/*
* set_pgd(pgd, *pgd_k); here would be useless on PAE
* and redundant with the set_pmd() on non-PAE. As would
- * set_pud.
+ * set_p4d/set_pud.
*/
- pud = pud_offset(pgd, address);
- pud_k = pud_offset(pgd_k, address);
+ p4d = p4d_offset(pgd, address);
+ p4d_k = p4d_offset(pgd_k, address);
+ if (!p4d_present(*p4d_k))
+ return NULL;
+
+ pud = pud_offset(p4d, address);
+ pud_k = pud_offset(p4d_k, address);
if (!pud_present(*pud_k))
return NULL;
@@ -384,6 +390,8 @@ static void dump_pagetable(unsigned long address)
{
pgd_t *base = __va(read_cr3());
pgd_t *pgd = &base[pgd_index(address)];
+ p4d_t *p4d;
+ pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -392,7 +400,9 @@ static void dump_pagetable(unsigned long address)
if (!low_pfn(pgd_val(*pgd) >> PAGE_SHIFT) || !pgd_present(*pgd))
goto out;
#endif
- pmd = pmd_offset(pud_offset(pgd, address), address);
+ p4d = p4d_offset(pgd, address);
+ pud = pud_offset(p4d, address);
+ pmd = pmd_offset(pud, address);
printk(KERN_CONT "*pde = %0*Lx ", sizeof(*pmd) * 2, (u64)pmd_val(*pmd));
/*
@@ -425,6 +435,7 @@ void vmalloc_sync_all(void)
static noinline int vmalloc_fault(unsigned long address)
{
pgd_t *pgd, *pgd_ref;
+ p4d_t *p4d, *p4d_ref;
pud_t *pud, *pud_ref;
pmd_t *pmd, *pmd_ref;
pte_t *pte, *pte_ref;
@@ -448,17 +459,37 @@ static noinline int vmalloc_fault(unsigned long address)
if (pgd_none(*pgd)) {
set_pgd(pgd, *pgd_ref);
arch_flush_lazy_mmu_mode();
- } else {
+ } else if (CONFIG_PGTABLE_LEVELS > 4) {
+ /*
+ * With folded p4d, pgd_none() is always false, so the pgd may
+ * point to an empty page table entry and pgd_page_vaddr()
+ * will return garbage.
+ *
+ * We will do the correct sanity check on the p4d level.
+ */
BUG_ON(pgd_page_vaddr(*pgd) != pgd_page_vaddr(*pgd_ref));
}
+ /* With 4-level paging, copying happens on the p4d level. */
+ p4d = p4d_offset(pgd, address);
+ p4d_ref = p4d_offset(pgd_ref, address);
+ if (p4d_none(*p4d_ref))
+ return -1;
+
+ if (p4d_none(*p4d)) {
+ set_p4d(p4d, *p4d_ref);
+ arch_flush_lazy_mmu_mode();
+ } else {
+ BUG_ON(p4d_pfn(*p4d) != p4d_pfn(*p4d_ref));
+ }
+
/*
* Below here mismatches are bugs because these lower tables
* are shared:
*/
- pud = pud_offset(pgd, address);
- pud_ref = pud_offset(pgd_ref, address);
+ pud = pud_offset(p4d, address);
+ pud_ref = pud_offset(p4d_ref, address);
if (pud_none(*pud_ref))
return -1;
@@ -526,6 +557,7 @@ static void dump_pagetable(unsigned long address)
{
pgd_t *base = __va(read_cr3() & PHYSICAL_PAGE_MASK);
pgd_t *pgd = base + pgd_index(address);
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -538,7 +570,15 @@ static void dump_pagetable(unsigned long address)
if (!pgd_present(*pgd))
goto out;
- pud = pud_offset(pgd, address);
+ p4d = p4d_offset(pgd, address);
+ if (bad_address(p4d))
+ goto bad;
+
+ printk("P4D %lx ", p4d_val(*p4d));
+ if (!p4d_present(*p4d) || p4d_large(*p4d))
+ goto out;
+
+ pud = pud_offset(p4d, address);
if (bad_address(pud))
goto bad;
@@ -1082,6 +1122,7 @@ static noinline int
spurious_fault(unsigned long error_code, unsigned long address)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -1104,7 +1145,14 @@ spurious_fault(unsigned long error_code, unsigned long address)
if (!pgd_present(*pgd))
return 0;
- pud = pud_offset(pgd, address);
+ p4d = p4d_offset(pgd, address);
+ if (!p4d_present(*p4d))
+ return 0;
+
+ if (p4d_large(*p4d))
+ return spurious_fault_check(error_code, (pte_t *) p4d);
+
+ pud = pud_offset(p4d, address);
if (!pud_present(*pud))
return 0;
diff --git a/arch/x86/mm/gup.c b/arch/x86/mm/gup.c
index 1f3b6ef105cd..456dfdfd2249 100644
--- a/arch/x86/mm/gup.c
+++ b/arch/x86/mm/gup.c
@@ -76,9 +76,9 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages)
}
/*
- * 'pteval' can come from a pte, pmd or pud. We only check
+ * 'pteval' can come from a pte, pmd, pud or p4d. We only check
* _PAGE_PRESENT, _PAGE_USER, and _PAGE_RW in here which are the
- * same value on all 3 types.
+ * same value on all 4 types.
*/
static inline int pte_allows_gup(unsigned long pteval, int write)
{
@@ -295,13 +295,13 @@ static noinline int gup_huge_pud(pud_t pud, unsigned long addr,
return 1;
}
-static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end,
+static int gup_pud_range(p4d_t p4d, unsigned long addr, unsigned long end,
int write, struct page **pages, int *nr)
{
unsigned long next;
pud_t *pudp;
- pudp = pud_offset(&pgd, addr);
+ pudp = pud_offset(&p4d, addr);
do {
pud_t pud = *pudp;
@@ -320,6 +320,27 @@ static int gup_pud_range(pgd_t pgd, unsigned long addr, unsigned long end,
return 1;
}
+static int gup_p4d_range(pgd_t pgd, unsigned long addr, unsigned long end,
+ int write, struct page **pages, int *nr)
+{
+ unsigned long next;
+ p4d_t *p4dp;
+
+ p4dp = p4d_offset(&pgd, addr);
+ do {
+ p4d_t p4d = *p4dp;
+
+ next = p4d_addr_end(addr, end);
+ if (p4d_none(p4d))
+ return 0;
+ BUILD_BUG_ON(p4d_large(p4d));
+ if (!gup_pud_range(p4d, addr, next, write, pages, nr))
+ return 0;
+ } while (p4dp++, addr = next, addr != end);
+
+ return 1;
+}
+
/*
* Like get_user_pages_fast() except its IRQ-safe in that it won't fall
* back to the regular GUP.
@@ -368,7 +389,7 @@ int __get_user_pages_fast(unsigned long start, int nr_pages, int write,
next = pgd_addr_end(addr, end);
if (pgd_none(pgd))
break;
- if (!gup_pud_range(pgd, addr, next, write, pages, &nr))
+ if (!gup_p4d_range(pgd, addr, next, write, pages, &nr))
break;
} while (pgdp++, addr = next, addr != end);
local_irq_restore(flags);
@@ -440,7 +461,7 @@ int get_user_pages_fast(unsigned long start, int nr_pages, int write,
next = pgd_addr_end(addr, end);
if (pgd_none(pgd))
goto slow;
- if (!gup_pud_range(pgd, addr, next, write, pages, &nr))
+ if (!gup_p4d_range(pgd, addr, next, write, pages, &nr))
goto slow;
} while (pgdp++, addr = next, addr != end);
local_irq_enable();
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index c5066a260803..302f43fd9c28 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -12,10 +12,12 @@
#include <linux/pagemap.h>
#include <linux/err.h>
#include <linux/sysctl.h>
+#include <linux/compat.h>
#include <asm/mman.h>
#include <asm/tlb.h>
#include <asm/tlbflush.h>
#include <asm/pgalloc.h>
+#include <asm/elf.h>
#if 0 /* This is just for testing */
struct page *
@@ -82,8 +84,9 @@ static unsigned long hugetlb_get_unmapped_area_bottomup(struct file *file,
info.flags = 0;
info.length = len;
- info.low_limit = current->mm->mmap_legacy_base;
- info.high_limit = TASK_SIZE;
+ info.low_limit = get_mmap_base(1);
+ info.high_limit = in_compat_syscall() ?
+ tasksize_32bit() : tasksize_64bit();
info.align_mask = PAGE_MASK & ~huge_page_mask(h);
info.align_offset = 0;
return vm_unmapped_area(&info);
@@ -100,7 +103,7 @@ static unsigned long hugetlb_get_unmapped_area_topdown(struct file *file,
info.flags = VM_UNMAPPED_AREA_TOPDOWN;
info.length = len;
info.low_limit = PAGE_SIZE;
- info.high_limit = current->mm->mmap_base;
+ info.high_limit = get_mmap_base(0);
info.align_mask = PAGE_MASK & ~huge_page_mask(h);
info.align_offset = 0;
addr = vm_unmapped_area(&info);
diff --git a/arch/x86/mm/ident_map.c b/arch/x86/mm/ident_map.c
index 4473cb4f8b90..04210a29dd60 100644
--- a/arch/x86/mm/ident_map.c
+++ b/arch/x86/mm/ident_map.c
@@ -45,6 +45,34 @@ static int ident_pud_init(struct x86_mapping_info *info, pud_t *pud_page,
return 0;
}
+static int ident_p4d_init(struct x86_mapping_info *info, p4d_t *p4d_page,
+ unsigned long addr, unsigned long end)
+{
+ unsigned long next;
+
+ for (; addr < end; addr = next) {
+ p4d_t *p4d = p4d_page + p4d_index(addr);
+ pud_t *pud;
+
+ next = (addr & P4D_MASK) + P4D_SIZE;
+ if (next > end)
+ next = end;
+
+ if (p4d_present(*p4d)) {
+ pud = pud_offset(p4d, 0);
+ ident_pud_init(info, pud, addr, next);
+ continue;
+ }
+ pud = (pud_t *)info->alloc_pgt_page(info->context);
+ if (!pud)
+ return -ENOMEM;
+ ident_pud_init(info, pud, addr, next);
+ set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE));
+ }
+
+ return 0;
+}
+
int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
unsigned long pstart, unsigned long pend)
{
@@ -55,27 +83,36 @@ int kernel_ident_mapping_init(struct x86_mapping_info *info, pgd_t *pgd_page,
for (; addr < end; addr = next) {
pgd_t *pgd = pgd_page + pgd_index(addr);
- pud_t *pud;
+ p4d_t *p4d;
next = (addr & PGDIR_MASK) + PGDIR_SIZE;
if (next > end)
next = end;
if (pgd_present(*pgd)) {
- pud = pud_offset(pgd, 0);
- result = ident_pud_init(info, pud, addr, next);
+ p4d = p4d_offset(pgd, 0);
+ result = ident_p4d_init(info, p4d, addr, next);
if (result)
return result;
continue;
}
- pud = (pud_t *)info->alloc_pgt_page(info->context);
- if (!pud)
+ p4d = (p4d_t *)info->alloc_pgt_page(info->context);
+ if (!p4d)
return -ENOMEM;
- result = ident_pud_init(info, pud, addr, next);
+ result = ident_p4d_init(info, p4d, addr, next);
if (result)
return result;
- set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
+ if (IS_ENABLED(CONFIG_X86_5LEVEL)) {
+ set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE));
+ } else {
+ /*
+ * With p4d folded, pgd is equal to p4d.
+ * The pgd entry has to point to the pud page table in this case.
+ */
+ pud_t *pud = pud_offset(p4d, 0);
+ set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE));
+ }
}
return 0;
diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
index 030bfed10a6c..f34d275ee201 100644
--- a/arch/x86/mm/init_32.c
+++ b/arch/x86/mm/init_32.c
@@ -56,8 +56,6 @@
unsigned long highstart_pfn, highend_pfn;
-static noinline int do_test_wp_bit(void);
-
bool __read_mostly __vmalloc_start_set = false;
/*
@@ -67,6 +65,7 @@ bool __read_mostly __vmalloc_start_set = false;
*/
static pmd_t * __init one_md_table_init(pgd_t *pgd)
{
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd_table;
@@ -75,13 +74,15 @@ static pmd_t * __init one_md_table_init(pgd_t *pgd)
pmd_table = (pmd_t *)alloc_low_page();
paravirt_alloc_pmd(&init_mm, __pa(pmd_table) >> PAGE_SHIFT);
set_pgd(pgd, __pgd(__pa(pmd_table) | _PAGE_PRESENT));
- pud = pud_offset(pgd, 0);
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d, 0);
BUG_ON(pmd_table != pmd_offset(pud, 0));
return pmd_table;
}
#endif
- pud = pud_offset(pgd, 0);
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d, 0);
pmd_table = pmd_offset(pud, 0);
return pmd_table;
@@ -390,8 +391,11 @@ pte_t *kmap_pte;
static inline pte_t *kmap_get_fixmap_pte(unsigned long vaddr)
{
- return pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(vaddr),
- vaddr), vaddr), vaddr);
+ pgd_t *pgd = pgd_offset_k(vaddr);
+ p4d_t *p4d = p4d_offset(pgd, vaddr);
+ pud_t *pud = pud_offset(p4d, vaddr);
+ pmd_t *pmd = pmd_offset(pud, vaddr);
+ return pte_offset_kernel(pmd, vaddr);
}
static void __init kmap_init(void)
@@ -410,6 +414,7 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
{
unsigned long vaddr;
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -418,7 +423,8 @@ static void __init permanent_kmaps_init(pgd_t *pgd_base)
page_table_range_init(vaddr, vaddr + PAGE_SIZE*LAST_PKMAP, pgd_base);
pgd = swapper_pg_dir + pgd_index(vaddr);
- pud = pud_offset(pgd, vaddr);
+ p4d = p4d_offset(pgd, vaddr);
+ pud = pud_offset(p4d, vaddr);
pmd = pmd_offset(pud, vaddr);
pte = pte_offset_kernel(pmd, vaddr);
pkmap_page_table = pte;
@@ -450,6 +456,7 @@ void __init native_pagetable_init(void)
{
unsigned long pfn, va;
pgd_t *pgd, *base = swapper_pg_dir;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -469,7 +476,8 @@ void __init native_pagetable_init(void)
if (!pgd_present(*pgd))
break;
- pud = pud_offset(pgd, va);
+ p4d = p4d_offset(pgd, va);
+ pud = pud_offset(p4d, va);
pmd = pmd_offset(pud, va);
if (!pmd_present(*pmd))
break;
@@ -716,22 +724,20 @@ void __init paging_init(void)
*/
static void __init test_wp_bit(void)
{
- int wp_works_ok;
+ char z = 0;
- printk(KERN_INFO
- "Checking if this processor honours the WP bit even in supervisor mode...");
+ printk(KERN_INFO "Checking if this processor honours the WP bit even in supervisor mode...");
- /* Any page-aligned address will do, the test is non-destructive */
- __set_fixmap(FIX_WP_TEST, __pa(&swapper_pg_dir), PAGE_KERNEL_RO);
- wp_works_ok = do_test_wp_bit();
- clear_fixmap(FIX_WP_TEST);
+ __set_fixmap(FIX_WP_TEST, __pa_symbol(empty_zero_page), PAGE_KERNEL_RO);
- if (!wp_works_ok) {
- printk(KERN_CONT "No.\n");
- panic("Linux doesn't support CPUs with broken WP.");
- } else {
+ if (probe_kernel_write((char *)fix_to_virt(FIX_WP_TEST), &z, 1)) {
+ clear_fixmap(FIX_WP_TEST);
printk(KERN_CONT "Ok.\n");
+ return;
}
+
+ printk(KERN_CONT "No.\n");
+ panic("Linux doesn't support CPUs with broken WP.");
}
void __init mem_init(void)
@@ -841,30 +847,6 @@ int arch_remove_memory(u64 start, u64 size)
#endif
#endif
-/*
- * This function cannot be __init, since exceptions don't work in that
- * section. Put this after the callers, so that it cannot be inlined.
- */
-static noinline int do_test_wp_bit(void)
-{
- char tmp_reg;
- int flag;
-
- __asm__ __volatile__(
- " movb %0, %1 \n"
- "1: movb %1, %0 \n"
- " xorl %2, %2 \n"
- "2: \n"
- _ASM_EXTABLE(1b,2b)
- :"=m" (*(char *)fix_to_virt(FIX_WP_TEST)),
- "=q" (tmp_reg),
- "=r" (flag)
- :"2" (1)
- :"memory");
-
- return flag;
-}
-
int kernel_set_to_readonly __read_mostly;
void set_kernel_text_rw(void)
diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index f6da869810a8..745e5e183169 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -97,28 +97,38 @@ void sync_global_pgds(unsigned long start, unsigned long end)
unsigned long address;
for (address = start; address <= end; address += PGDIR_SIZE) {
- const pgd_t *pgd_ref = pgd_offset_k(address);
+ pgd_t *pgd_ref = pgd_offset_k(address);
+ const p4d_t *p4d_ref;
struct page *page;
- if (pgd_none(*pgd_ref))
+ /*
+ * With folded p4d, pgd_none() is always false, we need to
+ * handle synchonization on p4d level.
+ */
+ BUILD_BUG_ON(pgd_none(*pgd_ref));
+ p4d_ref = p4d_offset(pgd_ref, address);
+
+ if (p4d_none(*p4d_ref))
continue;
spin_lock(&pgd_lock);
list_for_each_entry(page, &pgd_list, lru) {
pgd_t *pgd;
+ p4d_t *p4d;
spinlock_t *pgt_lock;
pgd = (pgd_t *)page_address(page) + pgd_index(address);
+ p4d = p4d_offset(pgd, address);
/* the pgt_lock only for Xen */
pgt_lock = &pgd_page_get_mm(page)->page_table_lock;
spin_lock(pgt_lock);
- if (!pgd_none(*pgd_ref) && !pgd_none(*pgd))
- BUG_ON(pgd_page_vaddr(*pgd)
- != pgd_page_vaddr(*pgd_ref));
+ if (!p4d_none(*p4d_ref) && !p4d_none(*p4d))
+ BUG_ON(p4d_page_vaddr(*p4d)
+ != p4d_page_vaddr(*p4d_ref));
- if (pgd_none(*pgd))
- set_pgd(pgd, *pgd_ref);
+ if (p4d_none(*p4d))
+ set_p4d(p4d, *p4d_ref);
spin_unlock(pgt_lock);
}
@@ -149,16 +159,28 @@ static __ref void *spp_getpage(void)
return ptr;
}
-static pud_t *fill_pud(pgd_t *pgd, unsigned long vaddr)
+static p4d_t *fill_p4d(pgd_t *pgd, unsigned long vaddr)
{
if (pgd_none(*pgd)) {
- pud_t *pud = (pud_t *)spp_getpage();
- pgd_populate(&init_mm, pgd, pud);
- if (pud != pud_offset(pgd, 0))
+ p4d_t *p4d = (p4d_t *)spp_getpage();
+ pgd_populate(&init_mm, pgd, p4d);
+ if (p4d != p4d_offset(pgd, 0))
printk(KERN_ERR "PAGETABLE BUG #00! %p <-> %p\n",
- pud, pud_offset(pgd, 0));
+ p4d, p4d_offset(pgd, 0));
+ }
+ return p4d_offset(pgd, vaddr);
+}
+
+static pud_t *fill_pud(p4d_t *p4d, unsigned long vaddr)
+{
+ if (p4d_none(*p4d)) {
+ pud_t *pud = (pud_t *)spp_getpage();
+ p4d_populate(&init_mm, p4d, pud);
+ if (pud != pud_offset(p4d, 0))
+ printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
+ pud, pud_offset(p4d, 0));
}
- return pud_offset(pgd, vaddr);
+ return pud_offset(p4d, vaddr);
}
static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
@@ -167,7 +189,7 @@ static pmd_t *fill_pmd(pud_t *pud, unsigned long vaddr)
pmd_t *pmd = (pmd_t *) spp_getpage();
pud_populate(&init_mm, pud, pmd);
if (pmd != pmd_offset(pud, 0))
- printk(KERN_ERR "PAGETABLE BUG #01! %p <-> %p\n",
+ printk(KERN_ERR "PAGETABLE BUG #02! %p <-> %p\n",
pmd, pmd_offset(pud, 0));
}
return pmd_offset(pud, vaddr);
@@ -179,20 +201,15 @@ static pte_t *fill_pte(pmd_t *pmd, unsigned long vaddr)
pte_t *pte = (pte_t *) spp_getpage();
pmd_populate_kernel(&init_mm, pmd, pte);
if (pte != pte_offset_kernel(pmd, 0))
- printk(KERN_ERR "PAGETABLE BUG #02!\n");
+ printk(KERN_ERR "PAGETABLE BUG #03!\n");
}
return pte_offset_kernel(pmd, vaddr);
}
-void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
+static void __set_pte_vaddr(pud_t *pud, unsigned long vaddr, pte_t new_pte)
{
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
-
- pud = pud_page + pud_index(vaddr);
- pmd = fill_pmd(pud, vaddr);
- pte = fill_pte(pmd, vaddr);
+ pmd_t *pmd = fill_pmd(pud, vaddr);
+ pte_t *pte = fill_pte(pmd, vaddr);
set_pte(pte, new_pte);
@@ -203,10 +220,25 @@ void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
__flush_tlb_one(vaddr);
}
+void set_pte_vaddr_p4d(p4d_t *p4d_page, unsigned long vaddr, pte_t new_pte)
+{
+ p4d_t *p4d = p4d_page + p4d_index(vaddr);
+ pud_t *pud = fill_pud(p4d, vaddr);
+
+ __set_pte_vaddr(pud, vaddr, new_pte);
+}
+
+void set_pte_vaddr_pud(pud_t *pud_page, unsigned long vaddr, pte_t new_pte)
+{
+ pud_t *pud = pud_page + pud_index(vaddr);
+
+ __set_pte_vaddr(pud, vaddr, new_pte);
+}
+
void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
pgd_t *pgd;
- pud_t *pud_page;
+ p4d_t *p4d_page;
pr_debug("set_pte_vaddr %lx to %lx\n", vaddr, native_pte_val(pteval));
@@ -216,17 +248,20 @@ void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
"PGD FIXMAP MISSING, it should be setup in head.S!\n");
return;
}
- pud_page = (pud_t*)pgd_page_vaddr(*pgd);
- set_pte_vaddr_pud(pud_page, vaddr, pteval);
+
+ p4d_page = p4d_offset(pgd, 0);
+ set_pte_vaddr_p4d(p4d_page, vaddr, pteval);
}
pmd_t * __init populate_extra_pmd(unsigned long vaddr)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pgd = pgd_offset_k(vaddr);
- pud = fill_pud(pgd, vaddr);
+ p4d = fill_p4d(pgd, vaddr);
+ pud = fill_pud(p4d, vaddr);
return fill_pmd(pud, vaddr);
}
@@ -245,6 +280,7 @@ static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
enum page_cache_mode cache)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pgprot_t prot;
@@ -255,11 +291,17 @@ static void __init __init_extra_mapping(unsigned long phys, unsigned long size,
for (; size; phys += PMD_SIZE, size -= PMD_SIZE) {
pgd = pgd_offset_k((unsigned long)__va(phys));
if (pgd_none(*pgd)) {
+ p4d = (p4d_t *) spp_getpage();
+ set_pgd(pgd, __pgd(__pa(p4d) | _KERNPG_TABLE |
+ _PAGE_USER));
+ }
+ p4d = p4d_offset(pgd, (unsigned long)__va(phys));
+ if (p4d_none(*p4d)) {
pud = (pud_t *) spp_getpage();
- set_pgd(pgd, __pgd(__pa(pud) | _KERNPG_TABLE |
+ set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE |
_PAGE_USER));
}
- pud = pud_offset(pgd, (unsigned long)__va(phys));
+ pud = pud_offset(p4d, (unsigned long)__va(phys));
if (pud_none(*pud)) {
pmd = (pmd_t *) spp_getpage();
set_pud(pud, __pud(__pa(pmd) | _KERNPG_TABLE |
@@ -563,12 +605,15 @@ kernel_physical_mapping_init(unsigned long paddr_start,
for (; vaddr < vaddr_end; vaddr = vaddr_next) {
pgd_t *pgd = pgd_offset_k(vaddr);
+ p4d_t *p4d;
pud_t *pud;
vaddr_next = (vaddr & PGDIR_MASK) + PGDIR_SIZE;
- if (pgd_val(*pgd)) {
- pud = (pud_t *)pgd_page_vaddr(*pgd);
+ BUILD_BUG_ON(pgd_none(*pgd));
+ p4d = p4d_offset(pgd, vaddr);
+ if (p4d_val(*p4d)) {
+ pud = (pud_t *)p4d_page_vaddr(*p4d);
paddr_last = phys_pud_init(pud, __pa(vaddr),
__pa(vaddr_end),
page_size_mask);
@@ -580,7 +625,7 @@ kernel_physical_mapping_init(unsigned long paddr_start,
page_size_mask);
spin_lock(&init_mm.page_table_lock);
- pgd_populate(&init_mm, pgd, pud);
+ p4d_populate(&init_mm, p4d, pud);
spin_unlock(&init_mm.page_table_lock);
pgd_changed = true;
}
@@ -726,6 +771,24 @@ static void __meminit free_pmd_table(pmd_t *pmd_start, pud_t *pud)
spin_unlock(&init_mm.page_table_lock);
}
+static void __meminit free_pud_table(pud_t *pud_start, p4d_t *p4d)
+{
+ pud_t *pud;
+ int i;
+
+ for (i = 0; i < PTRS_PER_PUD; i++) {
+ pud = pud_start + i;
+ if (!pud_none(*pud))
+ return;
+ }
+
+ /* free a pud talbe */
+ free_pagetable(p4d_page(*p4d), 0);
+ spin_lock(&init_mm.page_table_lock);
+ p4d_clear(p4d);
+ spin_unlock(&init_mm.page_table_lock);
+}
+
static void __meminit
remove_pte_table(pte_t *pte_start, unsigned long addr, unsigned long end,
bool direct)
@@ -899,7 +962,7 @@ remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
continue;
}
- pmd_base = (pmd_t *)pud_page_vaddr(*pud);
+ pmd_base = pmd_offset(pud, 0);
remove_pmd_table(pmd_base, addr, next, direct);
free_pmd_table(pmd_base, pud);
}
@@ -908,6 +971,32 @@ remove_pud_table(pud_t *pud_start, unsigned long addr, unsigned long end,
update_page_count(PG_LEVEL_1G, -pages);
}
+static void __meminit
+remove_p4d_table(p4d_t *p4d_start, unsigned long addr, unsigned long end,
+ bool direct)
+{
+ unsigned long next, pages = 0;
+ pud_t *pud_base;
+ p4d_t *p4d;
+
+ p4d = p4d_start + p4d_index(addr);
+ for (; addr < end; addr = next, p4d++) {
+ next = p4d_addr_end(addr, end);
+
+ if (!p4d_present(*p4d))
+ continue;
+
+ BUILD_BUG_ON(p4d_large(*p4d));
+
+ pud_base = pud_offset(p4d, 0);
+ remove_pud_table(pud_base, addr, next, direct);
+ free_pud_table(pud_base, p4d);
+ }
+
+ if (direct)
+ update_page_count(PG_LEVEL_512G, -pages);
+}
+
/* start and end are both virtual address. */
static void __meminit
remove_pagetable(unsigned long start, unsigned long end, bool direct)
@@ -915,7 +1004,7 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
unsigned long next;
unsigned long addr;
pgd_t *pgd;
- pud_t *pud;
+ p4d_t *p4d;
for (addr = start; addr < end; addr = next) {
next = pgd_addr_end(addr, end);
@@ -924,8 +1013,8 @@ remove_pagetable(unsigned long start, unsigned long end, bool direct)
if (!pgd_present(*pgd))
continue;
- pud = (pud_t *)pgd_page_vaddr(*pgd);
- remove_pud_table(pud, addr, next, direct);
+ p4d = p4d_offset(pgd, 0);
+ remove_p4d_table(p4d, addr, next, direct);
}
flush_tlb_all();
@@ -1090,6 +1179,7 @@ int kern_addr_valid(unsigned long addr)
{
unsigned long above = ((long)addr) >> __VIRTUAL_MASK_SHIFT;
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -1101,7 +1191,11 @@ int kern_addr_valid(unsigned long addr)
if (pgd_none(*pgd))
return 0;
- pud = pud_offset(pgd, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d))
+ return 0;
+
+ pud = pud_offset(p4d, addr);
if (pud_none(*pud))
return 0;
@@ -1158,6 +1252,7 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start,
unsigned long addr;
unsigned long next;
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
@@ -1168,7 +1263,11 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start,
if (!pgd)
return -ENOMEM;
- pud = vmemmap_pud_populate(pgd, addr, node);
+ p4d = vmemmap_p4d_populate(pgd, addr, node);
+ if (!p4d)
+ return -ENOMEM;
+
+ pud = vmemmap_pud_populate(p4d, addr, node);
if (!pud)
return -ENOMEM;
@@ -1236,6 +1335,7 @@ void register_page_bootmem_memmap(unsigned long section_nr,
unsigned long end = (unsigned long)(start_page + size);
unsigned long next;
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
unsigned int nr_pages;
@@ -1251,7 +1351,14 @@ void register_page_bootmem_memmap(unsigned long section_nr,
}
get_page_bootmem(section_nr, pgd_page(*pgd), MIX_SECTION_INFO);
- pud = pud_offset(pgd, addr);
+ p4d = p4d_offset(pgd, addr);
+ if (p4d_none(*p4d)) {
+ next = (addr + PAGE_SIZE) & PAGE_MASK;
+ continue;
+ }
+ get_page_bootmem(section_nr, p4d_page(*p4d), MIX_SECTION_INFO);
+
+ pud = pud_offset(p4d, addr);
if (pud_none(*pud)) {
next = (addr + PAGE_SIZE) & PAGE_MASK;
continue;
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index c43b6b33463a..e4f7b25df18e 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -426,7 +426,8 @@ static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
/* Don't assume we're using swapper_pg_dir at this point */
pgd_t *base = __va(read_cr3());
pgd_t *pgd = &base[pgd_index(addr)];
- pud_t *pud = pud_offset(pgd, addr);
+ p4d_t *p4d = p4d_offset(pgd, addr);
+ pud_t *pud = pud_offset(p4d, addr);
pmd_t *pmd = pmd_offset(pud, addr);
return pmd;
diff --git a/arch/x86/mm/kasan_init_64.c b/arch/x86/mm/kasan_init_64.c
index da92df32d0f1..0c7d8129bed6 100644
--- a/arch/x86/mm/kasan_init_64.c
+++ b/arch/x86/mm/kasan_init_64.c
@@ -34,8 +34,19 @@ static int __init map_range(struct range *range)
static void __init clear_pgds(unsigned long start,
unsigned long end)
{
- for (; start < end; start += PGDIR_SIZE)
- pgd_clear(pgd_offset_k(start));
+ pgd_t *pgd;
+
+ for (; start < end; start += PGDIR_SIZE) {
+ pgd = pgd_offset_k(start);
+ /*
+ * With folded p4d, pgd_clear() is nop, use p4d_clear()
+ * instead.
+ */
+ if (CONFIG_PGTABLE_LEVELS < 5)
+ p4d_clear(p4d_offset(pgd, start));
+ else
+ pgd_clear(pgd);
+ }
}
static void __init kasan_map_early_shadow(pgd_t *pgd)
@@ -45,8 +56,18 @@ static void __init kasan_map_early_shadow(pgd_t *pgd)
unsigned long end = KASAN_SHADOW_END;
for (i = pgd_index(start); start < end; i++) {
- pgd[i] = __pgd(__pa_nodebug(kasan_zero_pud)
- | _KERNPG_TABLE);
+ switch (CONFIG_PGTABLE_LEVELS) {
+ case 4:
+ pgd[i] = __pgd(__pa_nodebug(kasan_zero_pud) |
+ _KERNPG_TABLE);
+ break;
+ case 5:
+ pgd[i] = __pgd(__pa_nodebug(kasan_zero_p4d) |
+ _KERNPG_TABLE);
+ break;
+ default:
+ BUILD_BUG();
+ }
start += PGDIR_SIZE;
}
}
@@ -74,6 +95,7 @@ void __init kasan_early_init(void)
pteval_t pte_val = __pa_nodebug(kasan_zero_page) | __PAGE_KERNEL;
pmdval_t pmd_val = __pa_nodebug(kasan_zero_pte) | _KERNPG_TABLE;
pudval_t pud_val = __pa_nodebug(kasan_zero_pmd) | _KERNPG_TABLE;
+ p4dval_t p4d_val = __pa_nodebug(kasan_zero_pud) | _KERNPG_TABLE;
for (i = 0; i < PTRS_PER_PTE; i++)
kasan_zero_pte[i] = __pte(pte_val);
@@ -84,6 +106,9 @@ void __init kasan_early_init(void)
for (i = 0; i < PTRS_PER_PUD; i++)
kasan_zero_pud[i] = __pud(pud_val);
+ for (i = 0; CONFIG_PGTABLE_LEVELS >= 5 && i < PTRS_PER_P4D; i++)
+ kasan_zero_p4d[i] = __p4d(p4d_val);
+
kasan_map_early_shadow(early_level4_pgt);
kasan_map_early_shadow(init_level4_pgt);
}
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index 7940166c799b..19ad095b41df 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -30,30 +30,44 @@
#include <linux/limits.h>
#include <linux/sched/signal.h>
#include <linux/sched/mm.h>
+#include <linux/compat.h>
#include <asm/elf.h>
struct va_alignment __read_mostly va_align = {
.flags = -1,
};
-static unsigned long stack_maxrandom_size(void)
+unsigned long tasksize_32bit(void)
+{
+ return IA32_PAGE_OFFSET;
+}
+
+unsigned long tasksize_64bit(void)
+{
+ return TASK_SIZE_MAX;
+}
+
+static unsigned long stack_maxrandom_size(unsigned long task_size)
{
unsigned long max = 0;
if ((current->flags & PF_RANDOMIZE) &&
!(current->personality & ADDR_NO_RANDOMIZE)) {
- max = ((-1UL) & STACK_RND_MASK) << PAGE_SHIFT;
+ max = (-1UL) & __STACK_RND_MASK(task_size == tasksize_32bit());
+ max <<= PAGE_SHIFT;
}
return max;
}
-/*
- * Top of mmap area (just below the process stack).
- *
- * Leave an at least ~128 MB hole with possible stack randomization.
- */
-#define MIN_GAP (128*1024*1024UL + stack_maxrandom_size())
-#define MAX_GAP (TASK_SIZE/6*5)
+#ifdef CONFIG_COMPAT
+# define mmap32_rnd_bits mmap_rnd_compat_bits
+# define mmap64_rnd_bits mmap_rnd_bits
+#else
+# define mmap32_rnd_bits mmap_rnd_bits
+# define mmap64_rnd_bits mmap_rnd_bits
+#endif
+
+#define SIZE_128M (128 * 1024 * 1024UL)
static int mmap_is_legacy(void)
{
@@ -66,54 +80,91 @@ static int mmap_is_legacy(void)
return sysctl_legacy_va_layout;
}
-unsigned long arch_mmap_rnd(void)
+static unsigned long arch_rnd(unsigned int rndbits)
{
- unsigned long rnd;
-
- if (mmap_is_ia32())
-#ifdef CONFIG_COMPAT
- rnd = get_random_long() & ((1UL << mmap_rnd_compat_bits) - 1);
-#else
- rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1);
-#endif
- else
- rnd = get_random_long() & ((1UL << mmap_rnd_bits) - 1);
+ return (get_random_long() & ((1UL << rndbits) - 1)) << PAGE_SHIFT;
+}
- return rnd << PAGE_SHIFT;
+unsigned long arch_mmap_rnd(void)
+{
+ if (!(current->flags & PF_RANDOMIZE))
+ return 0;
+ return arch_rnd(mmap_is_ia32() ? mmap32_rnd_bits : mmap64_rnd_bits);
}
-static unsigned long mmap_base(unsigned long rnd)
+static unsigned long mmap_base(unsigned long rnd, unsigned long task_size)
{
unsigned long gap = rlimit(RLIMIT_STACK);
+ unsigned long gap_min, gap_max;
+
+ /*
+ * Top of mmap area (just below the process stack).
+ * Leave an at least ~128 MB hole with possible stack randomization.
+ */
+ gap_min = SIZE_128M + stack_maxrandom_size(task_size);
+ gap_max = (task_size / 6) * 5;
- if (gap < MIN_GAP)
- gap = MIN_GAP;
- else if (gap > MAX_GAP)
- gap = MAX_GAP;
+ if (gap < gap_min)
+ gap = gap_min;
+ else if (gap > gap_max)
+ gap = gap_max;
+
+ return PAGE_ALIGN(task_size - gap - rnd);
+}
- return PAGE_ALIGN(TASK_SIZE - gap - rnd);
+static unsigned long mmap_legacy_base(unsigned long rnd,
+ unsigned long task_size)
+{
+ return __TASK_UNMAPPED_BASE(task_size) + rnd;
}
/*
* This function, called very early during the creation of a new
* process VM image, sets up which VM layout function to use:
*/
+static void arch_pick_mmap_base(unsigned long *base, unsigned long *legacy_base,
+ unsigned long random_factor, unsigned long task_size)
+{
+ *legacy_base = mmap_legacy_base(random_factor, task_size);
+ if (mmap_is_legacy())
+ *base = *legacy_base;
+ else
+ *base = mmap_base(random_factor, task_size);
+}
+
void arch_pick_mmap_layout(struct mm_struct *mm)
{
- unsigned long random_factor = 0UL;
+ if (mmap_is_legacy())
+ mm->get_unmapped_area = arch_get_unmapped_area;
+ else
+ mm->get_unmapped_area = arch_get_unmapped_area_topdown;
- if (current->flags & PF_RANDOMIZE)
- random_factor = arch_mmap_rnd();
+ arch_pick_mmap_base(&mm->mmap_base, &mm->mmap_legacy_base,
+ arch_rnd(mmap64_rnd_bits), tasksize_64bit());
+
+#ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES
+ /*
+ * The mmap syscall mapping base decision depends solely on the
+ * syscall type (64-bit or compat). This applies for 64bit
+ * applications and 32bit applications. The 64bit syscall uses
+ * mmap_base, the compat syscall uses mmap_compat_base.
+ */
+ arch_pick_mmap_base(&mm->mmap_compat_base, &mm->mmap_compat_legacy_base,
+ arch_rnd(mmap32_rnd_bits), tasksize_32bit());
+#endif
+}
- mm->mmap_legacy_base = TASK_UNMAPPED_BASE + random_factor;
+unsigned long get_mmap_base(int is_legacy)
+{
+ struct mm_struct *mm = current->mm;
- if (mmap_is_legacy()) {
- mm->mmap_base = mm->mmap_legacy_base;
- mm->get_unmapped_area = arch_get_unmapped_area;
- } else {
- mm->mmap_base = mmap_base(random_factor);
- mm->get_unmapped_area = arch_get_unmapped_area_topdown;
+#ifdef CONFIG_HAVE_ARCH_COMPAT_MMAP_BASES
+ if (in_compat_syscall()) {
+ return is_legacy ? mm->mmap_compat_legacy_base
+ : mm->mmap_compat_base;
}
+#endif
+ return is_legacy ? mm->mmap_legacy_base : mm->mmap_base;
}
const char *arch_vma_name(struct vm_area_struct *vma)
diff --git a/arch/x86/mm/mpx.c b/arch/x86/mm/mpx.c
index cd44ae727df7..1c34b767c84c 100644
--- a/arch/x86/mm/mpx.c
+++ b/arch/x86/mm/mpx.c
@@ -526,15 +526,7 @@ int mpx_handle_bd_fault(void)
if (!kernel_managing_mpx_tables(current->mm))
return -EINVAL;
- if (do_mpx_bt_fault()) {
- force_sig(SIGSEGV, current);
- /*
- * The force_sig() is essentially "handling" this
- * exception, so we do not pass up the error
- * from do_mpx_bt_fault().
- */
- }
- return 0;
+ return do_mpx_bt_fault();
}
/*
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index f9d99535f233..25504d5aa816 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -201,7 +201,7 @@ static void __init alloc_node_data(int nid)
nd_pa = __memblock_alloc_base(nd_size, SMP_CACHE_BYTES,
MEMBLOCK_ALLOC_ACCESSIBLE);
if (!nd_pa) {
- pr_err("Cannot find %zu bytes in node %d\n",
+ pr_err("Cannot find %zu bytes in any node (initial node: %d)\n",
nd_size, nid);
return;
}
@@ -225,7 +225,7 @@ static void __init alloc_node_data(int nid)
* numa_cleanup_meminfo - Cleanup a numa_meminfo
* @mi: numa_meminfo to clean up
*
- * Sanitize @mi by merging and removing unncessary memblks. Also check for
+ * Sanitize @mi by merging and removing unnecessary memblks. Also check for
* conflicts and clear unused memblks.
*
* RETURNS:
diff --git a/arch/x86/mm/pageattr.c b/arch/x86/mm/pageattr.c
index a57e8e02f457..56b22fa504df 100644
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -346,6 +346,7 @@ static inline pgprot_t static_protections(pgprot_t prot, unsigned long address,
pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
unsigned int *level)
{
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
@@ -354,7 +355,15 @@ pte_t *lookup_address_in_pgd(pgd_t *pgd, unsigned long address,
if (pgd_none(*pgd))
return NULL;
- pud = pud_offset(pgd, address);
+ p4d = p4d_offset(pgd, address);
+ if (p4d_none(*p4d))
+ return NULL;
+
+ *level = PG_LEVEL_512G;
+ if (p4d_large(*p4d) || !p4d_present(*p4d))
+ return (pte_t *)p4d;
+
+ pud = pud_offset(p4d, address);
if (pud_none(*pud))
return NULL;
@@ -406,13 +415,18 @@ static pte_t *_lookup_address_cpa(struct cpa_data *cpa, unsigned long address,
pmd_t *lookup_pmd_address(unsigned long address)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pgd = pgd_offset_k(address);
if (pgd_none(*pgd))
return NULL;
- pud = pud_offset(pgd, address);
+ p4d = p4d_offset(pgd, address);
+ if (p4d_none(*p4d) || p4d_large(*p4d) || !p4d_present(*p4d))
+ return NULL;
+
+ pud = pud_offset(p4d, address);
if (pud_none(*pud) || pud_large(*pud) || !pud_present(*pud))
return NULL;
@@ -477,11 +491,13 @@ static void __set_pmd_pte(pte_t *kpte, unsigned long address, pte_t pte)
list_for_each_entry(page, &pgd_list, lru) {
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pgd = (pgd_t *)page_address(page) + pgd_index(address);
- pud = pud_offset(pgd, address);
+ p4d = p4d_offset(pgd, address);
+ pud = pud_offset(p4d, address);
pmd = pmd_offset(pud, address);
set_pte_atomic((pte_t *)pmd, pte);
}
@@ -836,9 +852,9 @@ static void unmap_pmd_range(pud_t *pud, unsigned long start, unsigned long end)
pud_clear(pud);
}
-static void unmap_pud_range(pgd_t *pgd, unsigned long start, unsigned long end)
+static void unmap_pud_range(p4d_t *p4d, unsigned long start, unsigned long end)
{
- pud_t *pud = pud_offset(pgd, start);
+ pud_t *pud = pud_offset(p4d, start);
/*
* Not on a GB page boundary?
@@ -1004,8 +1020,8 @@ static long populate_pmd(struct cpa_data *cpa,
return num_pages;
}
-static long populate_pud(struct cpa_data *cpa, unsigned long start, pgd_t *pgd,
- pgprot_t pgprot)
+static int populate_pud(struct cpa_data *cpa, unsigned long start, p4d_t *p4d,
+ pgprot_t pgprot)
{
pud_t *pud;
unsigned long end;
@@ -1026,7 +1042,7 @@ static long populate_pud(struct cpa_data *cpa, unsigned long start, pgd_t *pgd,
cur_pages = (pre_end - start) >> PAGE_SHIFT;
cur_pages = min_t(int, (int)cpa->numpages, cur_pages);
- pud = pud_offset(pgd, start);
+ pud = pud_offset(p4d, start);
/*
* Need a PMD page?
@@ -1047,7 +1063,7 @@ static long populate_pud(struct cpa_data *cpa, unsigned long start, pgd_t *pgd,
if (cpa->numpages == cur_pages)
return cur_pages;
- pud = pud_offset(pgd, start);
+ pud = pud_offset(p4d, start);
pud_pgprot = pgprot_4k_2_large(pgprot);
/*
@@ -1067,7 +1083,7 @@ static long populate_pud(struct cpa_data *cpa, unsigned long start, pgd_t *pgd,
if (start < end) {
long tmp;
- pud = pud_offset(pgd, start);
+ pud = pud_offset(p4d, start);
if (pud_none(*pud))
if (alloc_pmd_page(pud))
return -1;
@@ -1090,33 +1106,43 @@ static int populate_pgd(struct cpa_data *cpa, unsigned long addr)
{
pgprot_t pgprot = __pgprot(_KERNPG_TABLE);
pud_t *pud = NULL; /* shut up gcc */
+ p4d_t *p4d;
pgd_t *pgd_entry;
long ret;
pgd_entry = cpa->pgd + pgd_index(addr);
+ if (pgd_none(*pgd_entry)) {
+ p4d = (p4d_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
+ if (!p4d)
+ return -1;
+
+ set_pgd(pgd_entry, __pgd(__pa(p4d) | _KERNPG_TABLE));
+ }
+
/*
* Allocate a PUD page and hand it down for mapping.
*/
- if (pgd_none(*pgd_entry)) {
+ p4d = p4d_offset(pgd_entry, addr);
+ if (p4d_none(*p4d)) {
pud = (pud_t *)get_zeroed_page(GFP_KERNEL | __GFP_NOTRACK);
if (!pud)
return -1;
- set_pgd(pgd_entry, __pgd(__pa(pud) | _KERNPG_TABLE));
+ set_p4d(p4d, __p4d(__pa(pud) | _KERNPG_TABLE));
}
pgprot_val(pgprot) &= ~pgprot_val(cpa->mask_clr);
pgprot_val(pgprot) |= pgprot_val(cpa->mask_set);
- ret = populate_pud(cpa, addr, pgd_entry, pgprot);
+ ret = populate_pud(cpa, addr, p4d, pgprot);
if (ret < 0) {
/*
* Leave the PUD page in place in case some other CPU or thread
* already found it, but remove any useless entries we just
* added to it.
*/
- unmap_pud_range(pgd_entry, addr,
+ unmap_pud_range(p4d, addr,
addr + (cpa->numpages << PAGE_SHIFT));
return ret;
}
diff --git a/arch/x86/mm/pgtable.c b/arch/x86/mm/pgtable.c
index 6cbdff26bb96..508a708eb9a6 100644
--- a/arch/x86/mm/pgtable.c
+++ b/arch/x86/mm/pgtable.c
@@ -81,6 +81,14 @@ void ___pud_free_tlb(struct mmu_gather *tlb, pud_t *pud)
paravirt_release_pud(__pa(pud) >> PAGE_SHIFT);
tlb_remove_page(tlb, virt_to_page(pud));
}
+
+#if CONFIG_PGTABLE_LEVELS > 4
+void ___p4d_free_tlb(struct mmu_gather *tlb, p4d_t *p4d)
+{
+ paravirt_release_p4d(__pa(p4d) >> PAGE_SHIFT);
+ tlb_remove_page(tlb, virt_to_page(p4d));
+}
+#endif /* CONFIG_PGTABLE_LEVELS > 4 */
#endif /* CONFIG_PGTABLE_LEVELS > 3 */
#endif /* CONFIG_PGTABLE_LEVELS > 2 */
@@ -120,7 +128,7 @@ static void pgd_ctor(struct mm_struct *mm, pgd_t *pgd)
references from swapper_pg_dir. */
if (CONFIG_PGTABLE_LEVELS == 2 ||
(CONFIG_PGTABLE_LEVELS == 3 && SHARED_KERNEL_PMD) ||
- CONFIG_PGTABLE_LEVELS == 4) {
+ CONFIG_PGTABLE_LEVELS >= 4) {
clone_pgd_range(pgd + KERNEL_PGD_BOUNDARY,
swapper_pg_dir + KERNEL_PGD_BOUNDARY,
KERNEL_PGD_PTRS);
@@ -261,13 +269,15 @@ static void pgd_mop_up_pmds(struct mm_struct *mm, pgd_t *pgdp)
static void pgd_prepopulate_pmd(struct mm_struct *mm, pgd_t *pgd, pmd_t *pmds[])
{
+ p4d_t *p4d;
pud_t *pud;
int i;
if (PREALLOCATED_PMDS == 0) /* Work around gcc-3.4.x bug */
return;
- pud = pud_offset(pgd, 0);
+ p4d = p4d_offset(pgd, 0);
+ pud = pud_offset(p4d, 0);
for (i = 0; i < PREALLOCATED_PMDS; i++, pud++) {
pmd_t *pmd = pmds[i];
@@ -580,6 +590,28 @@ void native_set_fixmap(enum fixed_addresses idx, phys_addr_t phys,
}
#ifdef CONFIG_HAVE_ARCH_HUGE_VMAP
+#ifdef CONFIG_X86_5LEVEL
+/**
+ * p4d_set_huge - setup kernel P4D mapping
+ *
+ * No 512GB pages yet -- always return 0
+ */
+int p4d_set_huge(p4d_t *p4d, phys_addr_t addr, pgprot_t prot)
+{
+ return 0;
+}
+
+/**
+ * p4d_clear_huge - clear kernel P4D mapping when it is set
+ *
+ * No 512GB pages yet -- always return 0
+ */
+int p4d_clear_huge(p4d_t *p4d)
+{
+ return 0;
+}
+#endif
+
/**
* pud_set_huge - setup kernel PUD mapping
*
diff --git a/arch/x86/mm/pgtable_32.c b/arch/x86/mm/pgtable_32.c
index de53c52551a5..b9bd5b8b14fa 100644
--- a/arch/x86/mm/pgtable_32.c
+++ b/arch/x86/mm/pgtable_32.c
@@ -26,6 +26,7 @@ unsigned int __VMALLOC_RESERVE = 128 << 20;
void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
{
pgd_t *pgd;
+ p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@@ -35,7 +36,12 @@ void set_pte_vaddr(unsigned long vaddr, pte_t pteval)
BUG();
return;
}
- pud = pud_offset(pgd, vaddr);
+ p4d = p4d_offset(pgd, vaddr);
+ if (p4d_none(*p4d)) {
+ BUG();
+ return;
+ }
+ pud = pud_offset(p4d, vaddr);
if (pud_none(*pud)) {
BUG();
return;
diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index a7655f6caf7d..6e7bedf69af7 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -263,8 +263,6 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
{
struct flush_tlb_info info;
- if (end == 0)
- end = start + PAGE_SIZE;
info.flush_mm = mm;
info.flush_start = start;
info.flush_end = end;
@@ -289,23 +287,6 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
smp_call_function_many(cpumask, flush_tlb_func, &info, 1);
}
-void flush_tlb_current_task(void)
-{
- struct mm_struct *mm = current->mm;
-
- preempt_disable();
-
- count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
-
- /* This is an implicit full barrier that synchronizes with switch_mm. */
- local_flush_tlb();
-
- trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL);
- if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
- flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
- preempt_enable();
-}
-
/*
* See Documentation/x86/tlb.txt for details. We choose 33
* because it is large enough to cover the vast majority (at
@@ -326,6 +307,12 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
unsigned long base_pages_to_flush = TLB_FLUSH_ALL;
preempt_disable();
+
+ if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB))
+ base_pages_to_flush = (end - start) >> PAGE_SHIFT;
+ if (base_pages_to_flush > tlb_single_page_flush_ceiling)
+ base_pages_to_flush = TLB_FLUSH_ALL;
+
if (current->active_mm != mm) {
/* Synchronize with switch_mm. */
smp_mb();
@@ -342,15 +329,11 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
goto out;
}
- if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB))
- base_pages_to_flush = (end - start) >> PAGE_SHIFT;
-
/*
* Both branches below are implicit full barriers (MOV to CR or
* INVLPG) that synchronize with switch_mm.
*/
- if (base_pages_to_flush > tlb_single_page_flush_ceiling) {
- base_pages_to_flush = TLB_FLUSH_ALL;
+ if (base_pages_to_flush == TLB_FLUSH_ALL) {
count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
local_flush_tlb();
} else {
@@ -393,7 +376,7 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long start)
}
if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
- flush_tlb_others(mm_cpumask(mm), mm, start, 0UL);
+ flush_tlb_others(mm_cpumask(mm), mm, start, start + PAGE_SIZE);
preempt_enable();
}