openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

x86/mm: Make kernel_physical_mapping_init() support 5-level paging 

Populate additional page table level if CONFIG_X86_5LEVEL is enabled.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Andy Lutomirski <luto@kernel.org>
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: 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/20170606113133.22974-12-kirill.shutemov@linux.intel.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Kirill A. Shutemov 2017-06-06 14:31:30 +03:00 committed by Ingo Molnar
parent 141efad7d7
commit 7e82ea946a
1 changed files with 60 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

69
arch/x86/mm/init_64.c
View File

@ -624,6 +624,57 @@ phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
return paddr_last;
}
static unsigned long __meminit
phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
unsigned long page_size_mask)
{
unsigned long paddr_next, paddr_last = paddr_end;
unsigned long vaddr = (unsigned long)__va(paddr);
int i = p4d_index(vaddr);
if (!IS_ENABLED(CONFIG_X86_5LEVEL))
return phys_pud_init((pud_t *) p4d_page, paddr, paddr_end, page_size_mask);
for (; i < PTRS_PER_P4D; i++, paddr = paddr_next) {
p4d_t *p4d;
pud_t *pud;
vaddr = (unsigned long)__va(paddr);
p4d = p4d_page + p4d_index(vaddr);
paddr_next = (paddr & P4D_MASK) + P4D_SIZE;
if (paddr >= paddr_end) {
if (!after_bootmem &&
!e820__mapped_any(paddr & P4D_MASK, paddr_next,
E820_TYPE_RAM) &&
!e820__mapped_any(paddr & P4D_MASK, paddr_next,
E820_TYPE_RESERVED_KERN))
set_p4d(p4d, __p4d(0));
continue;
}
if (!p4d_none(*p4d)) {
pud = pud_offset(p4d, 0);
paddr_last = phys_pud_init(pud, paddr,
paddr_end,
page_size_mask);
__flush_tlb_all();
continue;
}
pud = alloc_low_page();
paddr_last = phys_pud_init(pud, paddr, paddr_end,
page_size_mask);
spin_lock(&init_mm.page_table_lock);
p4d_populate(&init_mm, p4d, pud);
spin_unlock(&init_mm.page_table_lock);
}
__flush_tlb_all();
return paddr_last;
}
/*
* Create page table mapping for the physical memory for specific physical
* addresses. The virtual and physical addresses have to be aligned on PMD level
@ -645,26 +696,26 @@ 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;
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),
if (pgd_val(*pgd)) {
p4d = (p4d_t *)pgd_page_vaddr(*pgd);
paddr_last = phys_p4d_init(p4d, __pa(vaddr),
__pa(vaddr_end),
page_size_mask);
continue;
}
pud = alloc_low_page();
paddr_last = phys_pud_init(pud, __pa(vaddr), __pa(vaddr_end),
p4d = alloc_low_page();
paddr_last = phys_p4d_init(p4d, __pa(vaddr), __pa(vaddr_end),
page_size_mask);
spin_lock(&init_mm.page_table_lock);
p4d_populate(&init_mm, p4d, pud);
if (IS_ENABLED(CONFIG_X86_5LEVEL))
pgd_populate(&init_mm, pgd, p4d);
else
p4d_populate(&init_mm, p4d_offset(pgd, vaddr), (pud_t *) p4d);
spin_unlock(&init_mm.page_table_lock);
pgd_changed = true;
}