Messages in this thread Patch in this message |  | | From | Masayoshi Mizuma <> | Subject | [PATCH v6 2/3] ACPI/NUMA: Add warning message if the padding size for KASLR is not enough | Date | Tue, 2 Oct 2018 21:33:22 -0400 |
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Add warning message if the padding size for KASLR, rand_mem_physical_padding, is not enough. The message also says the suitable padding size.
Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> --- drivers/acpi/numa.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+)
diff --git a/drivers/acpi/numa.c b/drivers/acpi/numa.c index 8516760..420ed2c 100644 --- a/drivers/acpi/numa.c +++ b/drivers/acpi/numa.c @@ -32,6 +32,7 @@ #include <linux/numa.h> #include <linux/nodemask.h> #include <linux/topology.h> +#include <asm/setup.h> static nodemask_t nodes_found_map = NODE_MASK_NONE; @@ -435,6 +436,7 @@ acpi_table_parse_srat(enum acpi_srat_type id, int __init acpi_numa_init(void) { int cnt = 0; + u64 max_possible_phys, max_actual_phys, threshold; if (acpi_disabled) return -EINVAL; @@ -463,6 +465,20 @@ int __init acpi_numa_init(void) cnt = acpi_table_parse_srat(ACPI_SRAT_TYPE_MEMORY_AFFINITY, acpi_parse_memory_affinity, 0); + + /* check the padding size for KASLR is enough. */ + if (parsed_numa_memblks && kaslr_enabled()) { + max_actual_phys = roundup(PFN_PHYS(max_pfn), + 1ULL << 40); + max_possible_phys = roundup(PFN_PHYS(max_possible_pfn), + 1ULL << 40); + threshold = max_actual_phys + + ((u64)get_rand_mem_physical_padding() << 40); + + if (max_possible_phys > threshold) + pr_warn("Set 'rand_mem_physical_padding=%llu' to avoid memory hotadd failure.\n", + (max_possible_phys - max_actual_phys) >> 40); + } } /* SLIT: System Locality Information Table */ -- 2.18.0
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