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qmp: Expose MachineClass::default_ram_id 

If a management application (like Libvirt) want's to preserve
migration ability and switch to '-machine memory-backend' it
needs to set exactly the same RAM id as QEMU would. Since the id
is machine type dependant, expose it under 'query-machines'
result. Some machine types don't have the attribute set (riscv
family for example), therefore the QMP attribute must be
optional.

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Message-Id: <9384422f63fe594a54d801f9cb4539b1d2ce9b67.1590481402.git.mprivozn@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
[ehabkost: updated doc to "since 5.2"]
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
Michal Privoznik 2020-05-26 10:25:35 +02:00 committed by Eduardo Habkost
parent 0aca03a3f1
commit c556600598
2 changed files with 8 additions and 1 deletions
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4
hw/core/machine-qmp-cmds.c
View File

@ -238,6 +238,10 @@ MachineInfoList *qmp_query_machines(Error **errp)
info->default_cpu_type = g_strdup(mc->default_cpu_type);
info->has_default_cpu_type = true;
}
if (mc->default_ram_id) {
info->default_ram_id = g_strdup(mc->default_ram_id);
info->has_default_ram_id = true;
}
entry = g_malloc0(sizeof(*entry));
entry->value = info;

5
qapi/machine.json
View File

@ -357,13 +357,16 @@
# @default-cpu-type: default CPU model typename if none is requested via
# the -cpu argument. (since 4.2)
#
# @default-ram-id: the default ID of initial RAM memory backend (since 5.2)
#
# Since: 1.2.0
##
{ 'struct': 'MachineInfo',
'data': { 'name': 'str', '*alias': 'str',
'*is-default': 'bool', 'cpu-max': 'int',
'hotpluggable-cpus': 'bool', 'numa-mem-supported': 'bool',
'deprecated': 'bool', '*default-cpu-type': 'str' } }
'deprecated': 'bool', '*default-cpu-type': 'str',
'*default-ram-id': 'str' } }
##
# @query-machines: