If 'CONFIG_MEMORY_HOTREMOVE' specified, walk the acpi srat memory
tables, store the immovable memory regions, so that kaslr can get
the information abouth where can be selected or not.
If 'CONFIG_MEMORY_HOTREMOVE' not specified, go on the old code.
Signed-off-by: Chao Fan <fanc.f...@cn.fujitsu.com>
---
arch/x86/boot/compressed/kaslr.c | 59 ++++++++++++++++++++++++++++++++
1 file changed, 59 insertions(+)
diff --git a/arch/x86/boot/compressed/kaslr.c b/arch/x86/boot/compressed/kaslr.c
index 302517929932..720878f967a3 100644
--- a/arch/x86/boot/compressed/kaslr.c
+++ b/arch/x86/boot/compressed/kaslr.c
@@ -31,6 +31,7 @@
#include "misc.h"
#include "error.h"
+#include "acpitb.h"
#include "../string.h"
#include <generated/compile.h>
@@ -104,6 +105,14 @@ static bool memmap_too_large;
/* Store memory limit specified by "mem=nn[KMG]" or "memmap=nn[KMG]" */
static unsigned long long mem_limit = ULLONG_MAX;
+#ifdef CONFIG_MEMORY_HOTREMOVE
+/* Store the immovable memory regions */
+static struct mem_vector immovable_mem[MAX_NUMNODES*2];
+
+/* Store the amount of immovable memory regions */
+static int num_immovable_mem;
+#endif
+
enum mem_avoid_index {
MEM_AVOID_ZO_RANGE = 0,
@@ -298,6 +307,51 @@ static int handle_mem_options(void)
return 0;
}
+#ifdef CONFIG_MEMORY_HOTREMOVE
+/*
+ * According to ACPI table, filter the immvoable memory regions
+ * and store them in immovable_mem[].
+ */
+static void handle_immovable_mem(void)
+{
+ char *args = (char *)get_cmd_line_ptr();
+ struct acpi_table_header *table_header;
+ struct acpi_subtable_header *table;
+ struct acpi_srat_mem_affinity *ma;
+ unsigned long table_end;
+ int i = 0;
+
+ if (!strstr(args, "movable_node"))
+ return;
+
+ table_header = get_acpi_srat_table();
+ if (!table_header)
+ return;
+
+ table_end = (unsigned long)table_header + table_header->length;
+
+ table = (struct acpi_subtable_header *)
+ ((unsigned long)table_header + sizeof(struct acpi_table_srat));
+
+ while (((unsigned long)table) + table->length < table_end) {
+ if (table->type == 1) {
+ ma = (struct acpi_srat_mem_affinity *)table;
+ if (!(ma->flags & ACPI_SRAT_MEM_HOT_PLUGGABLE)) {
+ immovable_mem[i].start = ma->base_address;
+ immovable_mem[i].size = ma->length;
+ i++;
+ }
+
+ if (i >= MAX_NUMNODES*2)
+ break;
+ }
+ table = (struct acpi_subtable_header *)
+ ((unsigned long)table + table->length);
+ }
+ num_immovable_mem = i;
+}
+#endif
+
/*
* In theory, KASLR can put the kernel anywhere in the range of [16M, 64T).
* The mem_avoid array is used to store the ranges that need to be avoided
@@ -421,6 +475,11 @@ static void mem_avoid_init(unsigned long input, unsigned
long input_size,
/* Mark the memmap regions we need to avoid */
handle_mem_options();
+#ifdef CONFIG_MEMORY_HOTREMOVE
+ /* Mark the immovable regions we need to choose */
+ handle_immovable_mem();
+#endif
+
#ifdef CONFIG_X86_VERBOSE_BOOTUP
/* Make sure video RAM can be used. */
add_identity_map(0, PMD_SIZE);
--
2.17.1
