[Qemu-devel] [PATCH 3/6] NUMA: check if the total numa memory size is equal to ram_size

[Igor Mammedov <imammedo@redhat.com>]

From: Wanlong Gao <gaowanlong@cn.fujitsu.com>

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 <gaowanlong@cn.fujitsu.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
---
 numa.c |   10 ++++++++++
 1 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/numa.c b/numa.c
index 7845036..d12a4f2 100644
--- a/numa.c
+++ b/numa.c
@@ -151,6 +151,16 @@ void set_numa_nodes(void)
             node_mem[i] = ram_size - usedmem;
         }
 
+        uint64_t numa_total = 0;
+        for (i = 0; i < nb_numa_nodes; i++) {
+            numa_total += node_mem[i];
+        }
+        if (numa_total != ram_size) {
+            fprintf(stderr, "qemu: numa nodes total memory size "
+                            "should equal ram_size\n");
+            exit(1);
+        }
+
         for (i = 0; i < nb_numa_nodes; i++) {
             if (!bitmap_empty(node_cpumask[i], MAX_CPUMASK_BITS)) {
                 break;
-- 
1.7.1