Re: [PATCH v3 3/7] x86/mm: Thread pgprot_t through init_memory_mapping()

From: Michal Hocko
Date: Tue Mar 03 2020 - 04:52:18 EST

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On Fri 21-02-20 11:24:59, Logan Gunthorpe wrote:
> In prepartion to support a pgprot_t argument for arch_add_memory().
>
> It's required to move the prototype of init_memory_mapping() seeing
> the original location came before the definition of pgprot_t.
>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: Borislav Petkov <bp@xxxxxxxxx>
> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
> Cc: x86@xxxxxxxxxx
> Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> Cc: Andy Lutomirski <luto@xxxxxxxxxx>
> Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
> Signed-off-by: Logan Gunthorpe <logang@xxxxxxxxxxxx>

Acked-by: Michal Hocko <mhocko@xxxxxxxx>

> ---
> arch/x86/include/asm/page_types.h | 3 ---
> arch/x86/include/asm/pgtable.h | 3 +++
> arch/x86/kernel/amd_gart_64.c | 3 ++-
> arch/x86/mm/init.c | 9 +++++----
> arch/x86/mm/init_32.c | 3 ++-
> arch/x86/mm/init_64.c | 32 +++++++++++++++++--------------
> arch/x86/mm/mm_internal.h | 3 ++-
> arch/x86/platform/uv/bios_uv.c | 3 ++-
> 8 files changed, 34 insertions(+), 25 deletions(-)
>
> diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h
> index c85e15010f48..bf7aa2e290ef 100644
> --- a/arch/x86/include/asm/page_types.h
> +++ b/arch/x86/include/asm/page_types.h
> @@ -73,9 +73,6 @@ static inline phys_addr_t get_max_mapped(void)
>
> bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn);
>
> -extern unsigned long init_memory_mapping(unsigned long start,
> - unsigned long end);
> -
> extern void initmem_init(void);
>
> #endif /* !__ASSEMBLY__ */
> diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
> index 7e118660bbd9..48d6a5960f28 100644
> --- a/arch/x86/include/asm/pgtable.h
> +++ b/arch/x86/include/asm/pgtable.h
> @@ -1046,6 +1046,9 @@ static inline void __meminit init_trampoline_default(void)
>
> void __init poking_init(void);
>
> +unsigned long init_memory_mapping(unsigned long start,
> + unsigned long end, pgprot_t prot);
> +
> # ifdef CONFIG_RANDOMIZE_MEMORY
> void __meminit init_trampoline(void);
> # else
> diff --git a/arch/x86/kernel/amd_gart_64.c b/arch/x86/kernel/amd_gart_64.c
> index 4e5f50236048..16133819415c 100644
> --- a/arch/x86/kernel/amd_gart_64.c
> +++ b/arch/x86/kernel/amd_gart_64.c
> @@ -744,7 +744,8 @@ int __init gart_iommu_init(void)
>
> start_pfn = PFN_DOWN(aper_base);
> if (!pfn_range_is_mapped(start_pfn, end_pfn))
> - init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT);
> + init_memory_mapping(start_pfn<<PAGE_SHIFT, end_pfn<<PAGE_SHIFT,
> + PAGE_KERNEL);
>
> pr_info("PCI-DMA: using GART IOMMU.\n");
> iommu_size = check_iommu_size(info.aper_base, aper_size);
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index e7bb483557c9..1bba16c5742b 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -467,7 +467,7 @@ bool pfn_range_is_mapped(unsigned long start_pfn, unsigned long end_pfn)
> * the physical memory. To access them they are temporarily mapped.
> */
> unsigned long __ref init_memory_mapping(unsigned long start,
> - unsigned long end)
> + unsigned long end, pgprot_t prot)
> {
> struct map_range mr[NR_RANGE_MR];
> unsigned long ret = 0;
> @@ -481,7 +481,8 @@ unsigned long __ref init_memory_mapping(unsigned long start,
>
> for (i = 0; i < nr_range; i++)
> ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
> - mr[i].page_size_mask);
> + mr[i].page_size_mask,
> + prot);
>
> add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT);
>
> @@ -521,7 +522,7 @@ static unsigned long __init init_range_memory_mapping(
> */
> can_use_brk_pgt = max(start, (u64)pgt_buf_end<<PAGE_SHIFT) >=
> min(end, (u64)pgt_buf_top<<PAGE_SHIFT);
> - init_memory_mapping(start, end);
> + init_memory_mapping(start, end, PAGE_KERNEL);
> mapped_ram_size += end - start;
> can_use_brk_pgt = true;
> }
> @@ -661,7 +662,7 @@ void __init init_mem_mapping(void)
> #endif
>
> /* the ISA range is always mapped regardless of memory holes */
> - init_memory_mapping(0, ISA_END_ADDRESS);
> + init_memory_mapping(0, ISA_END_ADDRESS, PAGE_KERNEL);
>
> /* Init the trampoline, possibly with KASLR memory offset */
> init_trampoline();
> diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
> index 3ec3dac7c268..e25a4218e6ff 100644
> --- a/arch/x86/mm/init_32.c
> +++ b/arch/x86/mm/init_32.c
> @@ -253,7 +253,8 @@ static inline int is_kernel_text(unsigned long addr)
> unsigned long __init
> kernel_physical_mapping_init(unsigned long start,
> unsigned long end,
> - unsigned long page_size_mask)
> + unsigned long page_size_mask,
> + pgprot_t prot)
> {
> int use_pse = page_size_mask == (1<<PG_LEVEL_2M);
> unsigned long last_map_addr = end;
> diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
> index 87977a8bfbbf..9e7692080dda 100644
> --- a/arch/x86/mm/init_64.c
> +++ b/arch/x86/mm/init_64.c
> @@ -585,7 +585,7 @@ phys_pmd_init(pmd_t *pmd_page, unsigned long paddr, unsigned long paddr_end,
> */
> static unsigned long __meminit
> phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
> - unsigned long page_size_mask, bool init)
> + unsigned long page_size_mask, pgprot_t _prot, bool init)
> {
> unsigned long pages = 0, paddr_next;
> unsigned long paddr_last = paddr_end;
> @@ -595,7 +595,7 @@ phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
> for (; i < PTRS_PER_PUD; i++, paddr = paddr_next) {
> pud_t *pud;
> pmd_t *pmd;
> - pgprot_t prot = PAGE_KERNEL;
> + pgprot_t prot = _prot;
>
> vaddr = (unsigned long)__va(paddr);
> pud = pud_page + pud_index(vaddr);
> @@ -644,9 +644,12 @@ phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
> if (page_size_mask & (1<<PG_LEVEL_1G)) {
> pages++;
> spin_lock(&init_mm.page_table_lock);
> +
> + prot = __pgprot(pgprot_val(prot) | __PAGE_KERNEL_LARGE);
> +
> set_pte_init((pte_t *)pud,
> pfn_pte((paddr & PUD_MASK) >> PAGE_SHIFT,
> - PAGE_KERNEL_LARGE),
> + prot),
> init);
> spin_unlock(&init_mm.page_table_lock);
> paddr_last = paddr_next;
> @@ -669,7 +672,7 @@ phys_pud_init(pud_t *pud_page, unsigned long paddr, unsigned long paddr_end,
>
> static unsigned long __meminit
> phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
> - unsigned long page_size_mask, bool init)
> + unsigned long page_size_mask, pgprot_t prot, bool init)
> {
> unsigned long vaddr, vaddr_end, vaddr_next, paddr_next, paddr_last;
>
> @@ -679,7 +682,7 @@ phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
>
> if (!pgtable_l5_enabled())
> return phys_pud_init((pud_t *) p4d_page, paddr, paddr_end,
> - page_size_mask, init);
> + page_size_mask, prot, init);
>
> for (; vaddr < vaddr_end; vaddr = vaddr_next) {
> p4d_t *p4d = p4d_page + p4d_index(vaddr);
> @@ -702,13 +705,13 @@ phys_p4d_init(p4d_t *p4d_page, unsigned long paddr, unsigned long paddr_end,
> if (!p4d_none(*p4d)) {
> pud = pud_offset(p4d, 0);
> paddr_last = phys_pud_init(pud, paddr, __pa(vaddr_end),
> - page_size_mask, init);
> + page_size_mask, prot, init);
> continue;
> }
>
> pud = alloc_low_page();
> paddr_last = phys_pud_init(pud, paddr, __pa(vaddr_end),
> - page_size_mask, init);
> + page_size_mask, prot, init);
>
> spin_lock(&init_mm.page_table_lock);
> p4d_populate_init(&init_mm, p4d, pud, init);
> @@ -722,7 +725,7 @@ static unsigned long __meminit
> __kernel_physical_mapping_init(unsigned long paddr_start,
> unsigned long paddr_end,
> unsigned long page_size_mask,
> - bool init)
> + pgprot_t prot, bool init)
> {
> bool pgd_changed = false;
> unsigned long vaddr, vaddr_start, vaddr_end, vaddr_next, paddr_last;
> @@ -743,13 +746,13 @@ __kernel_physical_mapping_init(unsigned long paddr_start,
> paddr_last = phys_p4d_init(p4d, __pa(vaddr),
> __pa(vaddr_end),
> page_size_mask,
> - init);
> + prot, init);
> continue;
> }
>
> p4d = alloc_low_page();
> paddr_last = phys_p4d_init(p4d, __pa(vaddr), __pa(vaddr_end),
> - page_size_mask, init);
> + page_size_mask, prot, init);
>
> spin_lock(&init_mm.page_table_lock);
> if (pgtable_l5_enabled())
> @@ -778,10 +781,10 @@ __kernel_physical_mapping_init(unsigned long paddr_start,
> unsigned long __meminit
> kernel_physical_mapping_init(unsigned long paddr_start,
> unsigned long paddr_end,
> - unsigned long page_size_mask)
> + unsigned long page_size_mask, pgprot_t prot)
> {
> return __kernel_physical_mapping_init(paddr_start, paddr_end,
> - page_size_mask, true);
> + page_size_mask, prot, true);
> }
>
> /*
> @@ -796,7 +799,8 @@ kernel_physical_mapping_change(unsigned long paddr_start,
> unsigned long page_size_mask)
> {
> return __kernel_physical_mapping_init(paddr_start, paddr_end,
> - page_size_mask, false);
> + page_size_mask, PAGE_KERNEL,
> + false);
> }
>
> #ifndef CONFIG_NUMA
> @@ -864,7 +868,7 @@ int arch_add_memory(int nid, u64 start, u64 size,
> unsigned long start_pfn = start >> PAGE_SHIFT;
> unsigned long nr_pages = size >> PAGE_SHIFT;
>
> - init_memory_mapping(start, start + size);
> + init_memory_mapping(start, start + size, PAGE_KERNEL);
>
> return add_pages(nid, start_pfn, nr_pages, params);
> }
> diff --git a/arch/x86/mm/mm_internal.h b/arch/x86/mm/mm_internal.h
> index eeae142062ed..3f37b5c80bb3 100644
> --- a/arch/x86/mm/mm_internal.h
> +++ b/arch/x86/mm/mm_internal.h
> @@ -12,7 +12,8 @@ void early_ioremap_page_table_range_init(void);
>
> unsigned long kernel_physical_mapping_init(unsigned long start,
> unsigned long end,
> - unsigned long page_size_mask);
> + unsigned long page_size_mask,
> + pgprot_t prot);
> unsigned long kernel_physical_mapping_change(unsigned long start,
> unsigned long end,
> unsigned long page_size_mask);
> diff --git a/arch/x86/platform/uv/bios_uv.c b/arch/x86/platform/uv/bios_uv.c
> index 607f58147311..c60255da5a6c 100644
> --- a/arch/x86/platform/uv/bios_uv.c
> +++ b/arch/x86/platform/uv/bios_uv.c
> @@ -352,7 +352,8 @@ void __iomem *__init efi_ioremap(unsigned long phys_addr, unsigned long size,
> if (type == EFI_MEMORY_MAPPED_IO)
> return ioremap(phys_addr, size);
>
> - last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size);
> + last_map_pfn = init_memory_mapping(phys_addr, phys_addr + size,
> + PAGE_KERNEL);
> if ((last_map_pfn << PAGE_SHIFT) < phys_addr + size) {
> unsigned long top = last_map_pfn << PAGE_SHIFT;
> efi_ioremap(top, size - (top - phys_addr), type, attribute);
> --
> 2.20.1
>

--
Michal Hocko
SUSE Labs

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