search for: pmd_size

...* Adds the specified range to the identity mappings. */ -static void add_identity_map(unsigned long start, unsigned long size) +static void add_identity_map(unsigned long start, unsigned long end) { - unsigned long end = start + size; - /* Align boundary to 2M. */ start = round_down(start, PMD_SIZE); end = round_up(end, PMD_SIZE); @@ -107,8 +105,6 @@ static void add_identity_map(unsigned long start, unsigned long size) /* Locates and clears a region for a new top level page table. */ void initialize_identity_maps(void) { - unsigned long start, size; - /* If running as an SEV guest, the...

...identity mappings. + * Once all ranges have been added, the new mapping is activated by calling + * finalize_identity_maps() below. + */ +void add_identity_map(unsigned long start, unsigned long size) +{ + unsigned long end = start + size; + + /* Align boundary to 2M. */ + start = round_down(start, PMD_SIZE); + end = round_up(end, PMD_SIZE); + if (start >= end) + return; + + /* Build the mapping. */ + kernel_ident_mapping_init(&mapping_info, (pgd_t *)top_level_pgt, + start, end); +} + /* Locates and clears a region for a new top level page table. */ void initialize_identity_maps(void)...

...); > + /* Only the head page has a reference to the pgmap. */ > + percpu_ref_put_many(page->pgmap->ref, HPAGE_PMD_NR - 1); > +} > +EXPORT_SYMBOL_GPL(prep_transhuge_device_private_page); Something else that may interest you from my patch series is support for page sizes other than PMD_SIZE. I don't know what page sizes your hardware supports. There's no support for page sizes other than PMD for anonymous memory, so this might not be too useful for you yet.

...+int set_page_non_present(unsigned long address) +{ + return set_clr_page_flags(&mapping_info, address, 0, _PAGE_PRESENT); +} + void do_boot_page_fault(struct pt_regs *regs, unsigned long error_code) { - unsigned long address = native_read_cr2() & PMD_MASK; - unsigned long end = address + PMD_SIZE; + unsigned long address = native_read_cr2(); + unsigned long end; + bool ghcb_fault; + + ghcb_fault = sev_es_check_ghcb_fault(address); + + address &= PMD_MASK; + end = address + PMD_SIZE; /* * Check for unexpected error codes. Unexpected are: @@ -302,9 +313,13 @@ void do_boot_...

...) + >> PMD_SHIFT; + /* + * fixmap_end_pmd_idx is the end of the fixmap minus the PMD that + * has been defined in the data section by head_32.S (see + * initial_pg_fixmap). + * Note: This is similar to what early_ioremap_page_table_range_init + * does except that the "end" has PMD_SIZE expunged as per previous + * comment. + */ + fixmap_end_pmd_idx = (FIXADDR_TOP - 1) >> PMD_SHIFT; + btmap_begin_pmd_idx = __fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT; + + size = fixmap_end_pmd_idx - fixmap_begin_pmd_idx; + /* + * early_ioremap_init has already allocated a PMD at + *...

...tic void __init find_early_table_space(unsigned long end) +static unsigned long __init find_early_table_space(unsigned long end) { - unsigned long puds, pmds, ptes, tables; + unsigned long puds, pmds, ptes, tables, fixmap_tables; puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; @@ -660,7 +682,16 @@ static void __init find_early_table_spac round_up(pmds * 8, PAGE_SIZE) + round_up(ptes * 8, PAGE_SIZE); - extend_init_mapping(tables); + /* Also reserve pages for fixmaps that need to be set up early. + * Their pud is shared with the kernel p...

...+ if (error_code & (X86_PF_PROT | X86_PF_USER | X86_PF_RSVD)) + do_pf_error("Unexpected page-fault:", error_code, address, regs->ip); + + /* + * Error code is sane - now identity map the 2M region around + * the faulting address. + */ + add_identity_map(address & PMD_MASK, PMD_SIZE); +} diff --git a/arch/x86/boot/compressed/idt_64.c b/arch/x86/boot/compressed/idt_64.c index 082cd6bca033..5f083092a86d 100644 --- a/arch/x86/boot/compressed/idt_64.c +++ b/arch/x86/boot/compressed/idt_64.c @@ -40,5 +40,7 @@ void load_stage2_idt(void) { boot_idt_desc.address = (unsigned long)bo...

...the page memory can be written to (requires HMM_PFN_VALID) * HMM_PFN_ERROR - accessing the pfn is impossible and the device should * fail. ie poisoned memory, special pages, no vma, etc + * HMM_PFN_PMD - if HMM_PFN_VALID is set, the page is at least of size + * PMD_SIZE and fully mapped by the CPU with consistent + * protection (e.g., all writeable if HMM_PFN_WRITE is set). + * HMM_PFN_PUD - if HMM_PFN_VALID is set, the page is at least of size + * PUD_SIZE and fully mapped by the CPU with consistent + * protection...

.../ @@ -436,11 +430,6 @@ static void mem_avoid_init(unsigned long input, unsigned long input_size, /* Enumerate the immovable memory regions */ num_immovable_mem = count_immovable_mem_regions(); - -#ifdef CONFIG_X86_VERBOSE_BOOTUP - /* Make sure video RAM can be used. */ - add_identity_map(0, PMD_SIZE); -#endif } /* @@ -919,19 +908,8 @@ void choose_random_location(unsigned long input, warn("Physical KASLR disabled: no suitable memory region!"); } else { /* Update the new physical address location. */ - if (*output != random_addr) { - add_identity_map(random_addr, output_...

...+ */ > + if (error_code & (X86_PF_PROT | X86_PF_USER | X86_PF_RSVD)) > + pf_error(error_code, address, regs); > + > + /* > + * Error code is sane - now identity map the 2M region around > + * the faulting address. > + */ > + add_identity_map(address & PMD_MASK, PMD_SIZE); > +} > diff --git a/arch/x86/boot/compressed/idt_64.c b/arch/x86/boot/compressed/idt_64.c > index 46ecea671b90..84ba57d9d436 100644 > --- a/arch/x86/boot/compressed/idt_64.c > +++ b/arch/x86/boot/compressed/idt_64.c > @@ -39,5 +39,7 @@ void load_stage2_idt(void) > { > b...

Hello, I have some diagnostic Info for you. Tried to get xen-4.0.1 working on another node of my cluster. Only difference: Newer revision of the Hardware. Exactly same Software Stack. Stack: Ubuntu Lucid 64bit, xen-4.0.1 from Source, selfbuilt linux-2.6.32.27 from xen/stable-2.6.32.x Nodes working: HP DL380G5 16GB (Intel X5460) Node not working: HP DL380G6 16GB (Intel X5550) Effect: Xen

...via kprobes, jump labels, etc. */ FIX_TEXT_POKE0, --- a/arch/arm/include/asm/highmem.h +++ b/arch/arm/include/asm/highmem.h @@ -2,7 +2,7 @@ #ifndef _ASM_HIGHMEM_H #define _ASM_HIGHMEM_H -#include <asm/kmap_types.h> +#include <asm/kmap_size.h> #define PKMAP_BASE (PAGE_OFFSET - PMD_SIZE) #define LAST_PKMAP PTRS_PER_PTE @@ -46,19 +46,32 @@ extern pte_t *pkmap_page_table; #ifdef ARCH_NEEDS_KMAP_HIGH_GET extern void *kmap_high_get(struct page *page); -#else + +static inline void *arch_kmap_local_high_get(struct page *page) +{ + if (IS_ENABLED(CONFIG_DEBUG_HIGHMEM) && !c...

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. Earlier versions were posted previously [1] and [2]. The patches apply cleanly to the linux-mm 5.10.0-rc2 tree. There are a lot of other THP patches being posted. I don't think there are any semantic conflicts but there may be some merge conflicts depending on

This series updates the boot protocol to 2.07 and uses it to implement paravirtual booting. This allows the bootloader to tell the kernel what kind of hardware/pseudo-hardware environment it's coming up under, and the kernel can use the appropriate boot sequence code. Specifically: - Update the boot protocol to 2.07, which adds fields to specify the hardware subarchitecture and some

This series updates the boot protocol to 2.07 and uses it to implement paravirtual booting. This allows the bootloader to tell the kernel what kind of hardware/pseudo-hardware environment it's coming up under, and the kernel can use the appropriate boot sequence code. Specifically: - Update the boot protocol to 2.07, which adds fields to specify the hardware subarchitecture and some

This series updates the boot protocol to 2.07 and uses it to implement paravirtual booting. This allows the bootloader to tell the kernel what kind of hardware/pseudo-hardware environment it's coming up under, and the kernel can use the appropriate boot sequence code. Specifically: - Update the boot protocol to 2.07, which adds fields to specify the hardware subarchitecture and some

[ This patch depends on the cross-architecture ELF cleanup patch. ] This series updates the boot protocol to 2.07 and uses it to implement paravirtual booting. This allows the bootloader to tell the kernel what kind of hardware/pseudo-hardware environment it's coming up under, and the kernel can use the appropriate boot sequence code. Specifically: - Update the boot protocol to 2.07, which

[ This patch depends on the cross-architecture ELF cleanup patch. ] This series updates the boot protocol to 2.07 and uses it to implement paravirtual booting. This allows the bootloader to tell the kernel what kind of hardware/pseudo-hardware environment it's coming up under, and the kernel can use the appropriate boot sequence code. Specifically: - Update the boot protocol to 2.07, which

The goal for this series is to introduce the hmm_range_fault() output array flags HMM_PFN_PMD and HMM_PFN_PUD. This allows a device driver to know that a given 4K PFN is actually mapped by the CPU using either a PMD sized or PUD sized CPU page table entry and therefore the device driver can safely map system memory using larger device MMU PTEs. The series is based on 5.8.0-rc3 and is intended for

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. An earlier version was posted previously [1]. This version now supports splitting a THP midway in the migration process which led to a number of changes. The patches apply cleanly to the current linux-mm tree. Since there are a couple of patches in linux-mm from Dan