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machine: make memory-backend a link property

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Handle HostMemoryBackend creation and setting of ms->ram entirely in
machine_run_board_init.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20220414165300.555321-5-pbonzini@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2022-04-14 12:52:59 -04:00
parent ce9d03fb3f
commit 26f88d84da
5 changed files with 74 additions and 69 deletions
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70
hw/core/machine.c
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@ -36,6 +36,7 @@
#include "exec/confidential-guest-support.h"
#include "hw/virtio/virtio.h"
#include "hw/virtio/virtio-pci.h"
#include "qom/object_interfaces.h"
GlobalProperty hw_compat_7_0[] = {};
const size_t hw_compat_7_0_len = G_N_ELEMENTS(hw_compat_7_0);
@ -653,21 +654,6 @@ bool device_type_is_dynamic_sysbus(MachineClass *mc, const char *type)
return allowed;
}
static char *machine_get_memdev(Object *obj, Error **errp)
{
MachineState *ms = MACHINE(obj);
return g_strdup(ms->ram_memdev_id);
}
static void machine_set_memdev(Object *obj, const char *value, Error **errp)
{
MachineState *ms = MACHINE(obj);
g_free(ms->ram_memdev_id);
ms->ram_memdev_id = g_strdup(value);
}
HotpluggableCPUList *machine_query_hotpluggable_cpus(MachineState *machine)
{
int i;
@ -1020,8 +1006,9 @@ static void machine_class_init(ObjectClass *oc, void *data)
object_class_property_set_description(oc, "memory-encryption",
"Set memory encryption object to use");
object_class_property_add_str(oc, "memory-backend",
machine_get_memdev, machine_set_memdev);
object_class_property_add_link(oc, "memory-backend", TYPE_MEMORY_BACKEND,
offsetof(MachineState, memdev), object_property_allow_set_link,
OBJ_PROP_LINK_STRONG);
object_class_property_set_description(oc, "memory-backend",
"Set RAM backend"
"Valid value is ID of hostmem based backend");
@ -1270,7 +1257,40 @@ MemoryRegion *machine_consume_memdev(MachineState *machine,
return ret;
}
void machine_run_board_init(MachineState *machine)
static bool create_default_memdev(MachineState *ms, const char *path, Error **errp)
{
Object *obj;
MachineClass *mc = MACHINE_GET_CLASS(ms);
bool r = false;
obj = object_new(path ? TYPE_MEMORY_BACKEND_FILE : TYPE_MEMORY_BACKEND_RAM);
if (path) {
if (!object_property_set_str(obj, "mem-path", path, errp)) {
goto out;
}
}
if (!object_property_set_int(obj, "size", ms->ram_size, errp)) {
goto out;
}
object_property_add_child(object_get_objects_root(), mc->default_ram_id,
obj);
/* Ensure backend's memory region name is equal to mc->default_ram_id */
if (!object_property_set_bool(obj, "x-use-canonical-path-for-ramblock-id",
false, errp)) {
goto out;
}
if (!user_creatable_complete(USER_CREATABLE(obj), errp)) {
goto out;
}
r = object_property_set_link(OBJECT(ms), "memory-backend", obj, errp);
out:
object_unref(obj);
return r;
}
void machine_run_board_init(MachineState *machine, const char *mem_path, Error **errp)
{
MachineClass *machine_class = MACHINE_GET_CLASS(machine);
ObjectClass *oc = object_class_by_name(machine->cpu_type);
@ -1281,11 +1301,11 @@ void machine_run_board_init(MachineState *machine)
clock values from the log. */
replay_checkpoint(CHECKPOINT_INIT);
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_class->default_ram_id && machine->ram_size &&
numa_uses_legacy_mem() && !machine->memdev) {
if (!create_default_memdev(current_machine, mem_path, errp)) {
return;
}
}
if (machine->numa_state) {
@ -1295,6 +1315,10 @@ void machine_run_board_init(MachineState *machine)
}
}
if (!machine->ram && machine->memdev) {
machine->ram = machine_consume_memdev(machine, machine->memdev);
}
/* If the machine supports the valid_cpu_types check and the user
* specified a CPU with -cpu check here that the user CPU is supported.
*/