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Third phase of support for x86_64 5-level page tables in Linux 4.17

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and later kernels.  With this patch, the usage of 5-level page tables
is automatically detected on live systems and when running against
vmcores that contain the new "NUMBER(pgtable_l5_enabled)" VMCOREINFO
entry.  Without the patch, the "--machdep vm=5level" command line
option is required.
(douly.fnst@cn.fujitsu.com, anderson@redhat.com)
This commit is contained in:
Dave Anderson 2018-07-10 15:24:38 -04:00
parent f294197b55
commit b21633026a
1 changed files with 37 additions and 19 deletions
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56
x86_64.c
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@ -294,25 +294,6 @@ x86_64_init(int when)
machdep->machspec->pgdir_shift = PGDIR_SHIFT;
machdep->machspec->ptrs_per_pgd = PTRS_PER_PGD;
break;
case VM_5LEVEL:
machdep->machspec->userspace_top = USERSPACE_TOP_5LEVEL;
machdep->machspec->page_offset = PAGE_OFFSET_5LEVEL;
machdep->machspec->vmalloc_start_addr = VMALLOC_START_ADDR_5LEVEL;
machdep->machspec->vmalloc_end = VMALLOC_END_5LEVEL;
machdep->machspec->modules_vaddr = MODULES_VADDR_5LEVEL;
machdep->machspec->modules_end = MODULES_END_5LEVEL;
machdep->machspec->vmemmap_vaddr = VMEMMAP_VADDR_5LEVEL;
machdep->machspec->vmemmap_end = VMEMMAP_END_5LEVEL;
if (symbol_exists("vmemmap_populate"))
machdep->flags |= VMEMMAP;
machdep->machspec->physical_mask_shift = __PHYSICAL_MASK_SHIFT_5LEVEL;
machdep->machspec->pgdir_shift = PGDIR_SHIFT_5LEVEL;
machdep->machspec->ptrs_per_pgd = PTRS_PER_PGD_5LEVEL;
if ((machdep->machspec->p4d = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc p4d space.");
machdep->machspec->last_p4d_read = 0;
machdep->uvtop = x86_64_uvtop_level4; /* 5-level is optional per-task */
}
machdep->kvbase = (ulong)PAGE_OFFSET;
machdep->identity_map_base = (ulong)PAGE_OFFSET;
@ -346,6 +327,43 @@ x86_64_init(int when)
break;
case POST_RELOC:
/* Check for 5-level paging */
if (!(machdep->flags & VM_5LEVEL)) {
int l5_enabled = 0;
if ((string = pc->read_vmcoreinfo("NUMBER(pgtable_l5_enabled)"))) {
l5_enabled = atoi(string);
free(string);
} else if (kernel_symbol_exists("__pgtable_l5_enabled"))
readmem(symbol_value("__pgtable_l5_enabled"), KVADDR,
&l5_enabled, sizeof(int), "__pgtable_l5_enabled",
FAULT_ON_ERROR);
if (l5_enabled)
machdep->flags |= VM_5LEVEL;
}
if (machdep->flags & VM_5LEVEL) {
machdep->machspec->userspace_top = USERSPACE_TOP_5LEVEL;
machdep->machspec->page_offset = PAGE_OFFSET_5LEVEL;
machdep->machspec->vmalloc_start_addr = VMALLOC_START_ADDR_5LEVEL;
machdep->machspec->vmalloc_end = VMALLOC_END_5LEVEL;
machdep->machspec->modules_vaddr = MODULES_VADDR_5LEVEL;
machdep->machspec->modules_end = MODULES_END_5LEVEL;
machdep->machspec->vmemmap_vaddr = VMEMMAP_VADDR_5LEVEL;
machdep->machspec->vmemmap_end = VMEMMAP_END_5LEVEL;
if (symbol_exists("vmemmap_populate"))
machdep->flags |= VMEMMAP;
machdep->machspec->physical_mask_shift = __PHYSICAL_MASK_SHIFT_5LEVEL;
machdep->machspec->pgdir_shift = PGDIR_SHIFT_5LEVEL;
machdep->machspec->ptrs_per_pgd = PTRS_PER_PGD_5LEVEL;
if ((machdep->machspec->p4d = (char *)malloc(PAGESIZE())) == NULL)
error(FATAL, "cannot malloc p4d space.");
machdep->machspec->last_p4d_read = 0;
machdep->uvtop = x86_64_uvtop_level4; /* 5-level is optional per-task */
machdep->kvbase = (ulong)PAGE_OFFSET;
machdep->identity_map_base = (ulong)PAGE_OFFSET;
}
/*
* Check for CONFIG_RANDOMIZE_MEMORY, and set page_offset here.
* The remainder of the virtual address range setups will get