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Date: Mon, 22 Oct 2012 11:14:12 -0400
From: Konrad Rzeszutek Wilk <konrad@...nel.org>
To: Yinghai Lu <yinghai@...nel.org>
Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
"H. Peter Anvin" <hpa@...or.com>, Jacob Shin <jacob.shin@....com>,
Tejun Heo <tj@...nel.org>,
Stefano Stabellini <stefano.stabellini@...citrix.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 11/19] x86, mm, xen: Remove mapping_pagatable_reserve
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@...nel.org>
> ---
> 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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