Re: [PATCH 11/19] x86, mm, xen: Remove mapping_pagatable_reserve

[Konrad Rzeszutek Wilk]

On Thu, Oct 18, 2012 at 01:50:22PM -0700, Yinghai Lu wrote:
> page table area are pre-mapped now, and mark_page_ro is used to make it RO
  ^ Page     ^^^^->areas                  ^^^^^^^^^^^-> ? I must have
missed that patch. Can you include the title of the patch in this
git commit so one could take a look.

> for xen.
      ^->Xen
> 
> mapping_pagetable_reserve is not used anymore, so remove it.
> 
> Signed-off-by: Yinghai Lu <yinghai@xxxxxxxxxx>
> ---
>  arch/x86/include/asm/pgtable_types.h |    1 -
>  arch/x86/include/asm/x86_init.h      |   12 ------------
>  arch/x86/kernel/x86_init.c           |    4 ----
>  arch/x86/mm/init.c                   |    4 ----
>  arch/x86/xen/mmu.c                   |   28 ----------------------------
>  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 ec8a1fc..79738f2 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 5769349..3b2ce8f 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 7a3d075..50cf83e 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 2257727..dd09d20 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 6226c99..efc5260 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)
> @@ -1484,19 +1470,6 @@ 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 */
> @@ -2178,7 +2151,6 @@ 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;
>  
> -- 
> 1.7.7
> 
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