3 files changed, 3 insertions, 128 deletions

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 07519a120449..2ead3c8a4c84 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -108,13 +108,13 @@ void sync_global_pgds(unsigned long start, unsigned long end)
 	for (address = start; address <= end; address += PGDIR_SIZE) {
 		const pgd_t *pgd_ref = pgd_offset_k(address);
 		struct page *page;
-		pgd_t *pgd;
 
 		if (pgd_none(*pgd_ref))
 			continue;
 
 		spin_lock(&pgd_lock);
 		list_for_each_entry(page, &pgd_list, lru) {
+			pgd_t *pgd;
 			spinlock_t *pgt_lock;
 
 			pgd = (pgd_t *)page_address(page) + pgd_index(address);
@@ -130,13 +130,6 @@ void sync_global_pgds(unsigned long start, unsigned long end)
 
 			spin_unlock(pgt_lock);
 		}
-
-		pgd = __va(real_mode_header->trampoline_pgd);
-		pgd += pgd_index(address);
-
-		if (pgd_none(*pgd))
-			set_pgd(pgd, *pgd_ref);
-
 		spin_unlock(&pgd_lock);
 	}
 }
diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index e190f7b56653..78fe3f1ac49f 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -50,107 +50,6 @@ int ioremap_change_attr(unsigned long vaddr, unsigned long size,
 	return err;
 }
 
-#ifdef CONFIG_X86_64
-static void ident_pte_range(unsigned long paddr, unsigned long vaddr,
-			    pmd_t *ppmd, pmd_t *vpmd, unsigned long end)
-{
-	pte_t *ppte = pte_offset_kernel(ppmd, paddr);
-	pte_t *vpte = pte_offset_kernel(vpmd, vaddr);
-
-	do {
-		set_pte(ppte, *vpte);
-	} while (ppte++, vpte++, vaddr += PAGE_SIZE, vaddr != end);
-}
-
-static int ident_pmd_range(unsigned long paddr, unsigned long vaddr,
-			    pud_t *ppud, pud_t *vpud, unsigned long end)
-{
-	pmd_t *ppmd = pmd_offset(ppud, paddr);
-	pmd_t *vpmd = pmd_offset(vpud, vaddr);
-	unsigned long next;
-
-	do {
-		next = pmd_addr_end(vaddr, end);
-
-		if (!pmd_present(*ppmd)) {
-			pte_t *ppte = (pte_t *)get_zeroed_page(GFP_KERNEL);
-			if (!ppte)
-				return 1;
-
-			set_pmd(ppmd, __pmd(_KERNPG_TABLE | __pa(ppte)));
-		}
-
-		ident_pte_range(paddr, vaddr, ppmd, vpmd, next);
-	} while (ppmd++, vpmd++, vaddr = next, vaddr != end);
-
-	return 0;
-}
-
-static int ident_pud_range(unsigned long paddr, unsigned long vaddr,
-			    pgd_t *ppgd, pgd_t *vpgd, unsigned long end)
-{
-	pud_t *ppud = pud_offset(ppgd, paddr);
-	pud_t *vpud = pud_offset(vpgd, vaddr);
-	unsigned long next;
-
-	do {
-		next = pud_addr_end(vaddr, end);
-
-		if (!pud_present(*ppud)) {
-			pmd_t *ppmd = (pmd_t *)get_zeroed_page(GFP_KERNEL);
-			if (!ppmd)
-				return 1;
-
-			set_pud(ppud, __pud(_KERNPG_TABLE | __pa(ppmd)));
-		}
-
-		if (ident_pmd_range(paddr, vaddr, ppud, vpud, next))
-			return 1;
-	} while (ppud++, vpud++, vaddr = next, vaddr != end);
-
-	return 0;
-}
-
-static int insert_identity_mapping(resource_size_t paddr, unsigned long vaddr,
-				    unsigned long size)
-{
-	unsigned long end = vaddr + size;
-	unsigned long next;
-	pgd_t *vpgd, *ppgd;
-
-	/* Don't map over the guard hole. */
-	if (paddr >= 0x800000000000 || paddr + size > 0x800000000000)
-		return 1;
-
-	ppgd = __va(real_mode_header->trampoline_pgd) + pgd_index(paddr);
-
-	vpgd = pgd_offset_k(vaddr);
-	do {
-		next = pgd_addr_end(vaddr, end);
-
-		if (!pgd_present(*ppgd)) {
-			pud_t *ppud = (pud_t *)get_zeroed_page(GFP_KERNEL);
-			if (!ppud)
-				return 1;
-
-			set_pgd(ppgd, __pgd(_KERNPG_TABLE | __pa(ppud)));
-		}
-
-		if (ident_pud_range(paddr, vaddr, ppgd, vpgd, next))
-			return 1;
-	} while (ppgd++, vpgd++, vaddr = next, vaddr != end);
-
-	return 0;
-}
-#else
-static inline int insert_identity_mapping(resource_size_t paddr,
-					  unsigned long vaddr,
-					  unsigned long size)
-{
-	return 0;
-}
-#endif /* CONFIG_X86_64 */
-
 /*
  * Remap an arbitrary physical address space into the kernel virtual
  * address space. Needed when the kernel wants to access high addresses
@@ -264,10 +163,6 @@ static void __iomem *__ioremap_caller(resource_size_t phys_addr,
 	ret_addr = (void __iomem *) (vaddr + offset);
 	mmiotrace_ioremap(unaligned_phys_addr, unaligned_size, ret_addr);
 
-	if (insert_identity_mapping(phys_addr, vaddr, size))
-		printk(KERN_WARNING "ioremap: unable to map 0x%llx in identity pagetable\n",
-					(unsigned long long)phys_addr);
-
 	/*
 	 * Check if the request spans more than any BAR in the iomem resource
 	 * tree.
diff --git a/arch/x86/realmode/init.c b/arch/x86/realmode/init.c
index 8e6ab6137852..cbca565af5bd 100644
--- a/arch/x86/realmode/init.c
+++ b/arch/x86/realmode/init.c
@@ -78,21 +78,8 @@ void __init setup_real_mode(void)
 	*trampoline_cr4_features = read_cr4();
 
 	trampoline_pgd = (u64 *) __va(real_mode_header->trampoline_pgd);
-
-	/*
-	 * Create an identity mapping for all of physical memory.
-	 */
-	for (i = 0; i <= pgd_index(max_pfn << PAGE_SHIFT); i++) {
-		int index = pgd_index(PAGE_OFFSET) + i;
-
-		trampoline_pgd[i] = (u64)pgd_val(swapper_pg_dir[index]);
-	}
-
-	/*
-	 * Copy the upper-half of the kernel pages tables.
-	 */
-	for (i = pgd_index(PAGE_OFFSET); i < PTRS_PER_PGD; i++)
-		trampoline_pgd[i] = (u64)pgd_val(swapper_pg_dir[i]);
+	trampoline_pgd[0] = __pa(level3_ident_pgt) + _KERNPG_TABLE;
+	trampoline_pgd[511] = __pa(level3_kernel_pgt) + _KERNPG_TABLE;
 #endif
 }