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x86/mm: Convert trivial cases of page table walk to 5-level paging 

This patch only covers simple cases. Less trivial cases will be
converted with separate patches.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Link: http://lkml.kernel.org/r/20170313143309.16020-3-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2017-03-13 17:33:05 +03:00 committed by Ingo Molnar
parent fe1e8c3e96
commit e0c4f6750e
9 changed files with 85 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
arch/x86/kernel/tboot.c
View File

@ -118,12 +118,16 @@ static int map_tboot_page(unsigned long vaddr, unsigned long pfn,
pgprot_t prot)
{
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
pgd = pgd_offset(&tboot_mm, vaddr);
pud = pud_alloc(&tboot_mm, pgd, vaddr);
p4d = p4d_alloc(&tboot_mm, pgd, vaddr);
if (!p4d)
return -1;
pud = pud_alloc(&tboot_mm, p4d, vaddr);
if (!pud)
return -1;
pmd = pmd_alloc(&tboot_mm, pud, vaddr);

6
arch/x86/kernel/vm86_32.c
View File

@ -164,6 +164,7 @@ static void mark_screen_rdonly(struct mm_struct *mm)
struct vm_area_struct *vma;
spinlock_t *ptl;
pgd_t *pgd;
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd;
pte_t *pte;
@ -173,7 +174,10 @@ static void mark_screen_rdonly(struct mm_struct *mm)
pgd = pgd_offset(mm, 0xA0000);
if (pgd_none_or_clear_bad(pgd))
goto out;
pud = pud_offset(pgd, 0xA0000);
p4d = p4d_offset(pgd, 0xA0000);
if (p4d_none_or_clear_bad(p4d))
goto out;
pud = pud_offset(p4d, 0xA0000);
if (pud_none_or_clear_bad(pud))
goto out;
pmd = pmd_offset(pud, 0xA0000);

39
arch/x86/mm/fault.c
View File

@ -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));
/*
@ -526,6 +536,7 @@ 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 +549,15 @@ 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 +1101,7 @@ 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 +1124,14 @@ 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;

22
arch/x86/mm/init_32.c
View File

@ -67,6 +67,7 @@ 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 +76,15 @@ 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 +393,11 @@ 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 +416,7 @@ 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 +425,8 @@ 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 +458,7 @@ 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 +478,8 @@ 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;

3
arch/x86/mm/ioremap.c
View File

@ -425,7 +425,8 @@ 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;

4
arch/x86/mm/pgtable.c
View File

@ -261,13 +261,15 @@ 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];

8
arch/x86/mm/pgtable_32.c
View File

@ -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;

13
arch/x86/platform/efi/efi_64.c
View File

@ -166,6 +166,7 @@ void efi_sync_low_kernel_mappings(void)
{
unsigned num_entries;
pgd_t *pgd_k, *pgd_efi;
p4d_t *p4d_k, *p4d_efi;
pud_t *pud_k, *pud_efi;
if (efi_enabled(EFI_OLD_MEMMAP))
@ -197,16 +198,20 @@ void efi_sync_low_kernel_mappings(void)
BUILD_BUG_ON((EFI_VA_END & ~PUD_MASK) != 0);
pgd_efi = efi_pgd + pgd_index(EFI_VA_END);
pud_efi = pud_offset(pgd_efi, 0);
p4d_efi = p4d_offset(pgd_efi, 0);
pud_efi = pud_offset(p4d_efi, 0);
pgd_k = pgd_offset_k(EFI_VA_END);
pud_k = pud_offset(pgd_k, 0);
p4d_k = p4d_offset(pgd_k, 0);
pud_k = pud_offset(p4d_k, 0);
num_entries = pud_index(EFI_VA_END);
memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);
pud_efi = pud_offset(pgd_efi, EFI_VA_START);
pud_k = pud_offset(pgd_k, EFI_VA_START);
p4d_efi = p4d_offset(pgd_efi, EFI_VA_START);
pud_efi = pud_offset(p4d_efi, EFI_VA_START);
p4d_k = p4d_offset(pgd_k, EFI_VA_START);
pud_k = pud_offset(p4d_k, EFI_VA_START);
num_entries = PTRS_PER_PUD - pud_index(EFI_VA_START);
memcpy(pud_efi, pud_k, sizeof(pud_t) * num_entries);

7
arch/x86/power/hibernate_32.c
View File

@ -32,6 +32,7 @@ pgd_t *resume_pg_dir;
*/
static pmd_t *resume_one_md_table_init(pgd_t *pgd)
{
p4d_t *p4d;
pud_t *pud;
pmd_t *pmd_table;
@ -41,11 +42,13 @@ static pmd_t *resume_one_md_table_init(pgd_t *pgd)
return NULL;
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));
#else
pud = pud_offset(pgd, 0);
p4d = p4d_offset(pgd, 0);
pud = pud_offset(p4d, 0);
pmd_table = pmd_offset(pud, 0);
#endif