[PATCH v6 2/3] ACPI/NUMA: Add warning message if the padding size for KASLR is not enough

[Masayoshi Mizuma]

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.miz...@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