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commit 28fa7bd09013455b5ddc020dea4706278cda0d65
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Author: Dave Anderson <anderson@redhat.com>
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Date: Tue Jun 19 16:31:54 2018 -0400
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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,
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titled "powerpc/mm/hash64: Increase the VA range", in which the
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maximum virtual address value has been increased to 4PB. Without
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the patch, the translation/access of high vmalloc space addresses
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fails; for example, the "kmem -[sS]" option fails the translation
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of per-cpu kmem_cache_cpu addresses located in vmalloc space, with
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the error messages "kmem: invalid kernel virtual address: <address>
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type: kmem_cache_cpu.freelist" and "kmem: invalid kernel virtual
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address: <address> type: kmem_cache_cpu.page", and the "vtop"
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command shows the addresses as "(not mapped)".
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(hbathini@linux.ibm.com)
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diff --git a/defs.h b/defs.h
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index 6e6f6be..e6e3850 100644
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--- a/defs.h
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+++ b/defs.h
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@@ -3978,6 +3978,7 @@ struct efi_memory_desc_t {
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#define PMD_INDEX_SIZE_L4_64K_4_12 10
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#define PUD_INDEX_SIZE_L4_64K_4_12 7
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#define PGD_INDEX_SIZE_L4_64K_4_12 8
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+#define PUD_INDEX_SIZE_L4_64K_4_17 10
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#define PTE_INDEX_SIZE_RADIX_64K 5
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#define PMD_INDEX_SIZE_RADIX_64K 9
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#define PUD_INDEX_SIZE_RADIX_64K 9
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diff --git a/ppc64.c b/ppc64.c
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index 0dd8a2a..f5d0dac 100644
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--- a/ppc64.c
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+++ b/ppc64.c
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@@ -451,7 +451,10 @@ ppc64_init(int when)
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if (THIS_KERNEL_VERSION >= LINUX(4,12,0)) {
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m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_12;
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- m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_12;
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+ if (THIS_KERNEL_VERSION >= LINUX(4,17,0))
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+ m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_17;
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+ else
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+ m->l3_index_size = PUD_INDEX_SIZE_L4_64K_4_12;
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m->l4_index_size = PGD_INDEX_SIZE_L4_64K_4_12;
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} else {
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m->l2_index_size = PMD_INDEX_SIZE_L4_64K_4_6;
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