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commit 3141bba98af302e2a7c5e2a19203bb8a40b6aa63
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Author: Dave Anderson <anderson@redhat.com>
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Date: Wed Oct 10 09:15:42 2018 -0400
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Fix the calculation of the vmalloc memory region size to account for
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Linux 4.17 commit a7412546d8cb5ad578805060b4006f2a021b5868, titled
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"x86/mm: Adjust vmalloc base and size at boot-time", which increases
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the region's size from 32TB to 1280TB when 5-level pagetables are
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enabled. Also presume that virtual addresses above the end of the
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vmalloc space up to the beginning of vmemmap space are translatable
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via 5-level page tables. Without the patch, mapped virtual addresses
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may fail translation in whatever command accesses them, with errors
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indicating "seek error: kernel virtual address: <mapped-address>
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type: <type-string>"
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(anderson@redhat.com)
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diff --git a/x86_64.c b/x86_64.c
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index 6f547e8..345122c 100644
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--- a/x86_64.c
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+++ b/x86_64.c
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@@ -393,8 +393,12 @@ x86_64_init(int when)
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readmem(symbol_value("vmalloc_base"), KVADDR,
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&machdep->machspec->vmalloc_start_addr,
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sizeof(ulong), "vmalloc_base", FAULT_ON_ERROR);
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- machdep->machspec->vmalloc_end =
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- machdep->machspec->vmalloc_start_addr + TERABYTES(32) - 1;
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+ if (machdep->flags & VM_5LEVEL)
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+ machdep->machspec->vmalloc_end =
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+ machdep->machspec->vmalloc_start_addr + TERABYTES(1280) - 1;
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+ else
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+ machdep->machspec->vmalloc_end =
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+ machdep->machspec->vmalloc_start_addr + TERABYTES(32) - 1;
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if (kernel_symbol_exists("vmemmap_base")) {
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readmem(symbol_value("vmemmap_base"), KVADDR,
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&machdep->machspec->vmemmap_vaddr, sizeof(ulong),
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@@ -1626,7 +1630,8 @@ x86_64_IS_VMALLOC_ADDR(ulong vaddr)
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(vaddr >= VSYSCALL_START && vaddr < VSYSCALL_END) ||
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(machdep->machspec->cpu_entry_area_start &&
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vaddr >= machdep->machspec->cpu_entry_area_start &&
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- vaddr <= machdep->machspec->cpu_entry_area_end));
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+ vaddr <= machdep->machspec->cpu_entry_area_end) ||
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+ ((machdep->flags & VM_5LEVEL) && vaddr > VMALLOC_END && vaddr < VMEMMAP_VADDR));
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}
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static int
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