@@ -28,6 +28,15 @@
#include "qapi-visit.h"
#include "qapi/opts-visitor.h"
#include "qapi/dealloc-visitor.h"
+#include "exec/memory.h"
+
+#ifdef __linux__
+#include <sys/syscall.h>
+#ifndef MPOL_F_RELATIVE_NODES
+#define MPOL_F_RELATIVE_NODES (1 << 14)
+#define MPOL_F_STATIC_NODES (1 << 15)
+#endif
+#endif
QemuOptsList qemu_numa_opts = {
.name = "numa",
@@ -219,6 +228,75 @@ void set_numa_nodes(void)
}
}
+#ifdef __linux__
+static int node_parse_bind_mode(unsigned int nodeid)
+{
+ int bind_mode;
+
+ switch (numa_info[nodeid].policy) {
+ case NUMA_NODE_POLICY_DEFAULT:
+ case NUMA_NODE_POLICY_PREFERRED:
+ case NUMA_NODE_POLICY_MEMBIND:
+ case NUMA_NODE_POLICY_INTERLEAVE:
+ bind_mode = numa_info[nodeid].policy;
+ break;
+ default:
+ bind_mode = NUMA_NODE_POLICY_DEFAULT;
+ return bind_mode;
+ }
+
+ bind_mode |= numa_info[nodeid].relative ?
+ MPOL_F_RELATIVE_NODES : MPOL_F_STATIC_NODES;
+
+ return bind_mode;
+}
+#endif
+
+static int set_node_mem_policy(int nodeid)
+{
+#ifdef __linux__
+ void *ram_ptr;
+ RAMBlock *block;
+ ram_addr_t len, ram_offset = 0;
+ int bind_mode;
+ int i;
+
+ QTAILQ_FOREACH(block, &ram_list.blocks, next) {
+ if (!strcmp(block->mr->name, "pc.ram")) {
+ break;
+ }
+ }
+
+ if (block->host == NULL) {
+ return -1;
+ }
+
+ ram_ptr = block->host;
+ for (i = 0; i < nodeid; i++) {
+ len = numa_info[i].node_mem;
+ ram_offset += len;
+ }
+
+ len = numa_info[nodeid].node_mem;
+ bind_mode = node_parse_bind_mode(nodeid);
+ unsigned long *nodes = numa_info[nodeid].host_mem;
+
+ /* This is a workaround for a long standing bug in Linux'
+ * mbind implementation, which cuts off the last specified
+ * node. To stay compatible should this bug be fixed, we
+ * specify one more node and zero this one out.
+ */
+ unsigned long maxnode = find_last_bit(nodes, MAX_NODES);
+ if (syscall(SYS_mbind, ram_ptr + ram_offset, len, bind_mode,
+ nodes, maxnode + 1, 0)) {
+ perror("mbind");
+ return -1;
+ }
+#endif
+
+ return 0;
+}
+
void set_numa_modes(void)
{
CPUState *cpu;
@@ -231,4 +309,11 @@ void set_numa_modes(void)
}
}
}
+
+ for (i = 0; i < nb_numa_nodes; i++) {
+ if (set_node_mem_policy(i) == -1) {
+ fprintf(stderr,
+ "qemu: can not set host memory policy for node%d\n", i);
+ }
+ }
}