[Qemu-devel] [PATCH v4 02/29] NUMA: check if the total numa memory size is equal to ram_size

[Hu Tao]

From: Wanlong Gao <address@hidden>

If the total number of the assigned numa nodes memory is not
equal to the assigned ram size, it will write the wrong data
to ACPI table, then the guest will ignore the wrong ACPI table
and recognize all memory to one node. It's buggy, we should
check it to ensure that we write the right data to ACPI table.

Signed-off-by: Wanlong Gao <address@hidden>
Reviewed-by: Eduardo Habkost <address@hidden>
Signed-off-by: Paolo Bonzini <address@hidden>
Signed-off-by: Hu Tao <address@hidden>
---
 numa.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/numa.c b/numa.c
index c419deb..b106531 100644
--- a/numa.c
+++ b/numa.c
@@ -26,6 +26,8 @@
 #include "exec/cpu-common.h"
 #include "qemu/bitmap.h"
 #include "qom/cpu.h"
+#include "qemu/error-report.h"
+#include "include/exec/cpu-common.h" /* for RAM_ADDR_FMT */
 
 static void numa_node_parse_cpus(int nodenr, const char *cpus)
 {
@@ -126,6 +128,7 @@ void numa_add(const char *optarg)
 void set_numa_nodes(void)
 {
     if (nb_numa_nodes > 0) {
+        uint64_t numa_total;
         int i;
 
         if (nb_numa_nodes > MAX_NODES) {
@@ -153,6 +156,17 @@ void set_numa_nodes(void)
             node_mem[i] = ram_size - usedmem;
         }
 
+        numa_total = 0;
+        for (i = 0; i < nb_numa_nodes; i++) {
+            numa_total += node_mem[i];
+        }
+        if (numa_total != ram_size) {
+            error_report("qemu: total memory size for NUMA nodes (%" PRIu64 ")"
+                         " should equal to RAM size (" RAM_ADDR_FMT ")\n",
+                         numa_total, ram_size);
+            exit(1);
+        }
+
         for (i = 0; i < nb_numa_nodes; i++) {
             if (!bitmap_empty(node_cpumask[i], MAX_CPUMASK_BITS)) {
                 break;
-- 
1.9.3