x86, mm, Xen: Remove mapping_pagetable_reserve()

Page table area are pre-mapped now after
	x86, mm: setup page table in top-down
	x86, mm: Remove early_memremap workaround for page table accessing on 64bit

mapping_pagetable_reserve is not used anymore, so remove it.

Also remove operation in mask_rw_pte(), as modified allow_low_page
always return pages that are already mapped, moreover
xen_alloc_pte_init, xen_alloc_pmd_init, etc, will mark the page RO
before hooking it into the pagetable automatically.

-v2: add changelog about mask_rw_pte() from Stefano.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Link: http://lkml.kernel.org/r/1353123563-3103-27-git-send-email-yinghai@kernel.org
Cc: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

5 files changed, 0 insertions, 49 deletions

diff --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h
index ec8a1fc9505d..79738f20aaf5 100644
--- a/arch/x86/include/asm/pgtable_types.h
+++ b/arch/x86/include/asm/pgtable_types.h
@@ -301,7 +301,6 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
 /* Install a pte for a particular vaddr in kernel space. */
 void set_pte_vaddr(unsigned long vaddr, pte_t pte);
 
-extern void native_pagetable_reserve(u64 start, u64 end);
 #ifdef CONFIG_X86_32
 extern void native_pagetable_init(void);
 #else
diff --git a/arch/x86/include/asm/x86_init.h b/arch/x86/include/asm/x86_init.h
index 57693498519c..3b2ce8fc995a 100644
--- a/arch/x86/include/asm/x86_init.h
+++ b/arch/x86/include/asm/x86_init.h
@@ -69,17 +69,6 @@ struct x86_init_oem {
 };
 
 /**
- * struct x86_init_mapping - platform specific initial kernel pagetable setup
- * @pagetable_reserve:  reserve a range of addresses for kernel pagetable usage
- *
- * For more details on the purpose of this hook, look in
- * init_memory_mapping and the commit that added it.
- */
-struct x86_init_mapping {
-        void (*pagetable_reserve)(u64 start, u64 end);
-};
-
-/**
  * struct x86_init_paging - platform specific paging functions
  * @pagetable_init:     platform specific paging initialization call to setup
  *                      the kernel pagetables and prepare accessors functions.
@@ -136,7 +125,6 @@ struct x86_init_ops {
         struct x86_init_mpparse         mpparse;
         struct x86_init_irqs            irqs;
         struct x86_init_oem             oem;
-        struct x86_init_mapping         mapping;
         struct x86_init_paging          paging;
         struct x86_init_timers          timers;
         struct x86_init_iommu           iommu;
diff --git a/arch/x86/kernel/x86_init.c b/arch/x86/kernel/x86_init.c
index 7a3d075a814a..50cf83ecd32e 100644
--- a/arch/x86/kernel/x86_init.c
+++ b/arch/x86/kernel/x86_init.c
@@ -62,10 +62,6 @@ struct x86_init_ops x86_init __initdata = {
                 .banner                 = default_banner,
         },
 
-        .mapping = {
-                .pagetable_reserve              = native_pagetable_reserve,
-        },
-
         .paging = {
                 .pagetable_init         = native_pagetable_init,
         },
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 6392bf9a3947..21173fcdb4a1 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -112,10 +112,6 @@ static void __init probe_page_size_mask(void)
                 __supported_pte_mask |= _PAGE_GLOBAL;
         }
 }
-void __init native_pagetable_reserve(u64 start, u64 end)
-{
-        memblock_reserve(start, end - start);
-}
 
 #ifdef CONFIG_X86_32
 #define NR_RANGE_MR 3
diff --git a/arch/x86/xen/mmu.c b/arch/x86/xen/mmu.c
index dcf5f2dd91ec..bbb883f58bc4 100644
--- a/arch/x86/xen/mmu.c
+++ b/arch/x86/xen/mmu.c
@@ -1178,20 +1178,6 @@ static void xen_exit_mmap(struct mm_struct *mm)
 
 static void xen_post_allocator_init(void);
 
-static __init void xen_mapping_pagetable_reserve(u64 start, u64 end)
-{
-        /* reserve the range used */
-        native_pagetable_reserve(start, end);
-
-        /* set as RW the rest */
-        printk(KERN_DEBUG "xen: setting RW the range %llx - %llx\n", end,
-                        PFN_PHYS(pgt_buf_top));
-        while (end < PFN_PHYS(pgt_buf_top)) {
-                make_lowmem_page_readwrite(__va(end));
-                end += PAGE_SIZE;
-        }
-}
-
 #ifdef CONFIG_X86_64
 static void __init xen_cleanhighmap(unsigned long vaddr,
                                     unsigned long vaddr_end)
@@ -1503,19 +1489,6 @@ static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
 #else /* CONFIG_X86_64 */
 static pte_t __init mask_rw_pte(pte_t *ptep, pte_t pte)
 {
-        unsigned long pfn = pte_pfn(pte);
-
-        /*
-         * If the new pfn is within the range of the newly allocated
-         * kernel pagetable, and it isn't being mapped into an
-         * early_ioremap fixmap slot as a freshly allocated page, make sure
-         * it is RO.
-         */
-        if (((!is_early_ioremap_ptep(ptep) &&
-                        pfn >= pgt_buf_start && pfn < pgt_buf_top)) ||
-                        (is_early_ioremap_ptep(ptep) && pfn != (pgt_buf_end - 1)))
-                pte = pte_wrprotect(pte);
-
         return pte;
 }
 #endif /* CONFIG_X86_64 */
@@ -2197,7 +2170,6 @@ static const struct pv_mmu_ops xen_mmu_ops __initconst = {
 
 void __init xen_init_mmu_ops(void)
 {
-        x86_init.mapping.pagetable_reserve = xen_mapping_pagetable_reserve;
         x86_init.paging.pagetable_init = xen_pagetable_init;
         pv_mmu_ops = xen_mmu_ops;