Guest can respond to ACPI hotplug events e.g. with _EJ or _OST method. This patch implements a tail queue to store guest notifications for memory hot-add and hot-remove requests.
Guest responses for memory hotplug command on a per-dimm basis can be detected with the new hmp command "info memhp" or the new qmp command "query-memhp" Examples:
(qemu) dimm_add dimm0 (qemu) info memhp Dimm: dimm0 hot-add success or Dimm: dimm0 hot-add failure
(qemu) dimm_del dimm0 (qemu) info memhp Dimm: dimm0 hot-remove success or Dimm: dimm0 hot-remove failure
Results are removed from the queue once read.
This patch only queues _EJ events that signal hot-remove success. For _OST event queuing, which cover the hot-remove failure and hot-add success/failure cases, the next 2 patches are also needed.
These notification items should probably be part of migration state (not yet implemented)
Signed-off-by: Vasilis Liaskovitis vasilis.liaskovitis@profitbricks.com --- hmp-commands.hx | 2 + hmp.c | 17 ++++++++++++++++ hmp.h | 1 + hw/dimm.c | 55 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ hw/dimm.h | 6 +++++ monitor.c | 7 ++++++ qapi-schema.json | 26 +++++++++++++++++++++++++ qmp-commands.hx | 38 +++++++++++++++++++++++++++++++++++++ 8 files changed, 152 insertions(+), 0 deletions(-)
diff --git a/hmp-commands.hx b/hmp-commands.hx index 012c150..3172cde 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -1459,6 +1459,8 @@ show device tree show qdev device model list @item info roms show roms +@item info memhp +show memhp @end table ETEXI
diff --git a/hmp.c b/hmp.c index b9cec1d..ec25d9a 100644 --- a/hmp.c +++ b/hmp.c @@ -1000,3 +1000,20 @@ void hmp_netdev_del(Monitor *mon, const QDict *qdict) qmp_netdev_del(id, &err); hmp_handle_error(mon, &err); } + +void hmp_info_memhp(Monitor *mon) +{ + MemHpInfoList *info; + MemHpInfoList *item; + MemHpInfo *dimm; + + info = qmp_query_memhp(NULL); + for (item = info; item; item = item->next) { + dimm = item->value; + monitor_printf(mon, "Dimm: %s %s %s\n", dimm->Dimm, + dimm->request, dimm->result); + dimm->Dimm = NULL; + } + + qapi_free_MemHpInfoList(info); +} diff --git a/hmp.h b/hmp.h index 79d138d..971e7c4 100644 --- a/hmp.h +++ b/hmp.h @@ -64,5 +64,6 @@ void hmp_device_del(Monitor *mon, const QDict *qdict); void hmp_dump_guest_memory(Monitor *mon, const QDict *qdict); void hmp_netdev_add(Monitor *mon, const QDict *qdict); void hmp_netdev_del(Monitor *mon, const QDict *qdict); +void hmp_info_memhp(Monitor *mon);
#endif diff --git a/hw/dimm.c b/hw/dimm.c index 00c4623..9b32386 100644 --- a/hw/dimm.c +++ b/hw/dimm.c @@ -26,6 +26,7 @@ static DeviceState *dimm_hotplug_qdev; static dimm_hotplug_fn dimm_hotplug; static QTAILQ_HEAD(Dimmlist, DimmState) dimmlist; +static QTAILQ_HEAD(dimm_hp_result_head, dimm_hp_result) dimm_hp_result_queue;
static Property dimm_properties[] = { DEFINE_PROP_END_OF_LIST() @@ -189,16 +190,69 @@ void dimm_notify(uint32_t idx, uint32_t event) DimmState *s; s = dimm_find_from_idx(idx); assert(s != NULL); + struct dimm_hp_result *result = g_malloc0(sizeof(*result));
+ result->s = s; + result->ret = event; switch(event) { case DIMM_REMOVE_SUCCESS: dimm_depopulate(s); + QTAILQ_INSERT_TAIL(&dimm_hp_result_queue, result, next); break; default: + g_free(result); break; } }
+MemHpInfoList *qmp_query_memhp(Error **errp) +{ + MemHpInfoList *head = NULL, *cur_item = NULL, *info; + struct dimm_hp_result *item, *nextitem; + + QTAILQ_FOREACH_SAFE(item, &dimm_hp_result_queue, next, nextitem) { + + info = g_malloc0(sizeof(*info)); + info->value = g_malloc0(sizeof(*info->value)); + info->value->Dimm = g_malloc0(sizeof(char) * 32); + info->value->request = g_malloc0(sizeof(char) * 16); + info->value->result = g_malloc0(sizeof(char) * 16); + switch (item->ret) { + case DIMM_REMOVE_SUCCESS: + strcpy(info->value->request, "hot-remove"); + strcpy(info->value->result, "success"); + break; + case DIMM_REMOVE_FAIL: + strcpy(info->value->request, "hot-remove"); + strcpy(info->value->result, "failure"); + break; + case DIMM_ADD_SUCCESS: + strcpy(info->value->request, "hot-add"); + strcpy(info->value->result, "success"); + break; + case DIMM_ADD_FAIL: + strcpy(info->value->request, "hot-add"); + strcpy(info->value->result, "failure"); + break; + default: + break; + } + strcpy(info->value->Dimm, item->s->busdev.qdev.id); + /* XXX: waiting for the qapi to support GSList */ + if (!cur_item) { + head = cur_item = info; + } else { + cur_item->next = info; + cur_item = info; + } + + /* hotplug notification copied to qmp list, delete original item */ + QTAILQ_REMOVE(&dimm_hp_result_queue, item, next); + g_free(item); + } + + return head; +} static int dimm_init(SysBusDevice *s) { DimmState *slot; @@ -217,6 +271,7 @@ static void dimm_class_init(ObjectClass *klass, void *data) sc->init = dimm_init; dimm_hotplug = NULL; QTAILQ_INIT(&dimmlist); + QTAILQ_INIT(&dimm_hp_result_queue); }
static TypeInfo dimm_info = { diff --git a/hw/dimm.h b/hw/dimm.h index 643f319..3e55ed3 100644 --- a/hw/dimm.h +++ b/hw/dimm.h @@ -37,6 +37,12 @@ typedef struct DimmState { QTAILQ_ENTRY (DimmState) nextdimm; } DimmState;
+struct dimm_hp_result { + DimmState *s; + dimm_hp_result_code ret; + QTAILQ_ENTRY (dimm_hp_result) next; +}; + typedef int (*dimm_hotplug_fn)(DeviceState *qdev, SysBusDevice *dev, int add); typedef target_phys_addr_t (*dimm_calcoffset_fn)(uint64_t size);
diff --git a/monitor.c b/monitor.c index d3d95a6..4a14e26 100644 --- a/monitor.c +++ b/monitor.c @@ -2732,6 +2732,13 @@ static mon_cmd_t info_cmds[] = { .mhandler.info = do_trace_print_events, }, { + .name = "memhp", + .args_type = "", + .params = "", + .help = "show memory hotplug status", + .mhandler.info = hmp_info_memhp, + }, + { .name = NULL, }, }; diff --git a/qapi-schema.json b/qapi-schema.json index 3b6e346..049f6f9 100644 --- a/qapi-schema.json +++ b/qapi-schema.json @@ -1862,3 +1862,29 @@ # Since: 0.14.0 ## { 'command': 'netdev_del', 'data': {'id': 'str'} } + +## +# @MemHpInfo: +# +# Information about status of a memory hotplug command +# +# @Dimm: the Dimm associated with the result +# +# @result: the result of the hotplug command +# +# Since: 1.1.3 +# +## +{ 'type': 'MemHpInfo', + 'data': {'Dimm': 'str', 'request': 'str', 'result': 'str'} } + +## +# @query-memhp: +# +# Returns a list of information about pending hotplug commands +# +# Returns: a list of @MemhpInfo +# +# Since: 1.1.3 +## +{ 'command': 'query-memhp', 'returns': ['MemHpInfo'] } diff --git a/qmp-commands.hx b/qmp-commands.hx index 7efd628..cd1d5f0 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -2248,3 +2248,41 @@ Example: <- { "return": {} }
EQMP + + { + .name = "query-memhp", + .args_type = "", + .mhandler.cmd_new = qmp_marshal_input_query_memhp + }, +SQMP +query-memhp +---------- + +Show memory hotplug command notifications. + +Return a json-array. Each DIMM that has a pending notification is represented +by a json-object, which contains: + +- "Dimm": Dimm name (json-str) +- "request": type of hot request: hot-add or hot-remove (json-str) +- "result": result of the hotplug request for this Dimm success or failure (json-str) + +Example: + +-> { "execute": "query-memhp" } +<- { + "return":[ + { + "result": "failure", + "request": "hot-remove", + "Dimm": "dimm10" + }, + { + "result": "success", + "request": "hot-add", + "Dimm": "dimm3" + } + ] + } + +EQMP