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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>
This commit is contained in:
Yinghai Lu 2012-11-16 19:39:03 -08:00 committed by H. Peter Anvin
parent 9985b4c6fa
commit 6f80b68e9e
5 changed files with 0 additions and 49 deletions
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1
arch/x86/include/asm/pgtable_types.h
View File

@ -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

12
arch/x86/include/asm/x86_init.h
View File

@ -68,17 +68,6 @@ struct x86_init_oem {
void (*banner)(void);
};
/**
* 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
@ -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;

4
arch/x86/kernel/x86_init.c
View File

@ -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,
},

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

@ -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

28
arch/x86/xen/mmu.c
View File

@ -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;