@@ -26,6 +26,7 @@
#include "sysemu/qtest.h"
#include "hw/pci/pci.h"
#include "hw/mem/nvdimm.h"
+#include "migration/vmstate.h"
GlobalProperty hw_compat_4_2[] = {
{ "virtio-blk-device", "x-enable-wce-if-config-wce", "off" },
@@ -1059,10 +1060,33 @@ static void machine_numa_finish_cpu_init(MachineState *machine)
g_string_free(s, true);
}
+MemoryRegion *machine_consume_memdev(MachineState *machine,
+ HostMemoryBackend *backend)
+{
+ MemoryRegion *ret = host_memory_backend_get_memory(backend);
+
+ if (memory_region_is_mapped(ret)) {
+ char *path = object_get_canonical_path_component(OBJECT(backend));
+ error_report("memory backend %s can't be used multiple times.", path);
+ g_free(path);
+ exit(EXIT_FAILURE);
+ }
+ host_memory_backend_set_mapped(backend, true);
+ vmstate_register_ram_global(ret);
+ return ret;
+}
+
void machine_run_board_init(MachineState *machine)
{
MachineClass *machine_class = MACHINE_GET_CLASS(machine);
+ if (machine->ram_memdev_id) {
+ Object *o;
+ o = object_resolve_path_type(machine->ram_memdev_id,
+ TYPE_MEMORY_BACKEND, NULL);
+ machine->ram = machine_consume_memdev(machine, MEMORY_BACKEND(o));
+ }
+
if (machine->numa_state) {
numa_complete_configuration(machine);
if (machine->numa_state->num_nodes) {
@@ -817,20 +817,8 @@ void memory_region_allocate_system_memory(MemoryRegion *mr, Object *owner,
if (!backend) {
continue;
}
- MemoryRegion *seg = host_memory_backend_get_memory(backend);
-
- if (memory_region_is_mapped(seg)) {
- char *path = object_get_canonical_path_component(OBJECT(backend));
- error_report("memory backend %s is used multiple times. Each "
- "-numa option must use a different memdev value.",
- path);
- g_free(path);
- exit(1);
- }
-
- host_memory_backend_set_mapped(backend, true);
+ MemoryRegion *seg = machine_consume_memdev(ms, backend);
memory_region_add_subregion(mr, addr, seg);
- vmstate_register_ram_global(seg);
addr += size;
}
}
@@ -73,7 +73,12 @@ void machine_set_cpu_numa_node(MachineState *machine,
Error **errp);
void machine_class_allow_dynamic_sysbus_dev(MachineClass *mc, const char *type);
-
+/*
+ * Checks that backend isn't used, preps it for exclusive usage and
+ * returns migratable MemoryRegion provided by backend.
+ */
+MemoryRegion *machine_consume_memdev(MachineState *machine,
+ HostMemoryBackend *backend);
/**
* CPUArchId:
@@ -295,6 +300,11 @@ struct MachineState {
bool enable_graphics;
char *memory_encryption;
char *ram_memdev_id;
+ /*
+ * convenience alias to ram_memdev_id backend memory region
+ * or to numa container memory region
+ */
+ MemoryRegion *ram;
DeviceMemoryState *device_memory;
ram_addr_t ram_size;