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Fix for PPC64 kernel virtual address translation in Linux 4.17 and

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later kernels with commit c2b4d8b7417a59b7f9a52d0d8402f5257cbbd398,
titled "powerpc/mm/hash64: Increase the VA range", in which the
maximum virtual address value has been increased to 4PB.  Without
the patch, the translation/access of high vmalloc space addresses
fails; for example, the "kmem -[sS]" option fails the translation
of per-cpu kmem_cache_cpu addresses located in vmalloc space, with
the error messages "kmem: invalid kernel virtual address: <address>
type: kmem_cache_cpu.freelist" and "kmem: invalid kernel virtual
address: <address>  type: kmem_cache_cpu.page", and the "vtop"
command shows the addresses as "(not mapped)".
(hbathini@linux.ibm.com)
This commit is contained in:
Dave Anderson 2018-06-19 16:31:54 -04:00
parent 1926150ee3
commit 28fa7bd090
2 changed files with 5 additions and 1 deletions
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1
defs.h
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@ -3977,6 +3977,7 @@ struct efi_memory_desc_t {
#define PMD_INDEX_SIZE_L4_64K_4_12 10
#define PUD_INDEX_SIZE_L4_64K_4_12 7
#define PGD_INDEX_SIZE_L4_64K_4_12 8
#define PUD_INDEX_SIZE_L4_64K_4_17 10
#define PTE_INDEX_SIZE_RADIX_64K 5
#define PMD_INDEX_SIZE_RADIX_64K 9
#define PUD_INDEX_SIZE_RADIX_64K 9

5
ppc64.c
View File

@ -451,7 +451,10 @@ ppc64_init(int when)
if (THIS_KERNEL_VERSION >= LINUX(4,12,0)) {
m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_12;
m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_12;
if (THIS_KERNEL_VERSION >= LINUX(4,17,0))
m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_17;
else
m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_12;
m->l4_index_size = PGD_INDEX_SIZE_L4_64K_4_12;
} else {
m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_6;