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qemu/monitor/qmp-cmds.c
Paolo Bonzini cf7405bc02 qmp: add filtering of statistics by name 
Allow retrieving only a subset of statistics.  This can be useful
for example in order to plot a subset of the statistics many times
a second: KVM publishes ~40 statistics for each vCPU on x86; retrieving
and serializing all of them would be useless.

Another use will be in HMP in the following patch; implementing the
filter in the backend is easy enough that it was deemed okay to make
this a public interface.

Example:

{ "execute": "query-stats",
  "arguments": {
    "target": "vcpu",
    "vcpus": [ "/machine/unattached/device[2]",
               "/machine/unattached/device[4]" ],
    "providers": [
      { "provider": "kvm",
        "names": [ "l1d_flush", "exits" ] } } }

{ "return": {
    "vcpus": [
      { "path": "/machine/unattached/device[2]"
        "providers": [
          { "provider": "kvm",
            "stats": [ { "name": "l1d_flush", "value": 41213 },
                       { "name": "exits", "value": 74291 } ] } ] },
      { "path": "/machine/unattached/device[4]"
        "providers": [
          { "provider": "kvm",
            "stats": [ { "name": "l1d_flush", "value": 16132 },
                       { "name": "exits", "value": 57922 } ] } ] } ] } }

Extracted from a patch by Mark Kanda.

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2022-06-14 16:50:30 +02:00

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/*
* QEMU Management Protocol commands
*
* Copyright IBM, Corp. 2011
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
* Contributions after 2012-01-13 are licensed under the terms of the
* GNU GPL, version 2 or (at your option) any later version.
*/
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qemu/option.h"
#include "monitor/monitor.h"
#include "sysemu/sysemu.h"
#include "qemu/config-file.h"
#include "qemu/uuid.h"
#include "chardev/char.h"
#include "ui/qemu-spice.h"
#include "ui/console.h"
#include "ui/dbus-display.h"
#include "sysemu/kvm.h"
#include "sysemu/runstate.h"
#include "sysemu/runstate-action.h"
#include "sysemu/blockdev.h"
#include "sysemu/block-backend.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-acpi.h"
#include "qapi/qapi-commands-block.h"
#include "qapi/qapi-commands-control.h"
#include "qapi/qapi-commands-machine.h"
#include "qapi/qapi-commands-misc.h"
#include "qapi/qapi-commands-stats.h"
#include "qapi/qapi-commands-ui.h"
#include "qapi/type-helpers.h"
#include "qapi/qmp/qerror.h"
#include "exec/ramlist.h"
#include "hw/mem/memory-device.h"
#include "hw/acpi/acpi_dev_interface.h"
#include "hw/intc/intc.h"
#include "hw/rdma/rdma.h"
#include "monitor/stats.h"
NameInfo *qmp_query_name(Error **errp)
{
NameInfo *info = g_malloc0(sizeof(*info));
if (qemu_name) {
info->has_name = true;
info->name = g_strdup(qemu_name);
}
return info;
}
KvmInfo *qmp_query_kvm(Error **errp)
{
KvmInfo *info = g_malloc0(sizeof(*info));
info->enabled = kvm_enabled();
info->present = accel_find("kvm");
return info;
}
UuidInfo *qmp_query_uuid(Error **errp)
{
UuidInfo *info = g_malloc0(sizeof(*info));
info->UUID = qemu_uuid_unparse_strdup(&qemu_uuid);
return info;
}
void qmp_quit(Error **errp)
{
shutdown_action = SHUTDOWN_ACTION_POWEROFF;
qemu_system_shutdown_request(SHUTDOWN_CAUSE_HOST_QMP_QUIT);
}
void qmp_stop(Error **errp)
{
/* if there is a dump in background, we should wait until the dump
* finished */
if (qemu_system_dump_in_progress()) {
error_setg(errp, "There is a dump in process, please wait.");
return;
}
if (runstate_check(RUN_STATE_INMIGRATE)) {
autostart = 0;
} else {
vm_stop(RUN_STATE_PAUSED);
}
}
void qmp_system_reset(Error **errp)
{
qemu_system_reset_request(SHUTDOWN_CAUSE_HOST_QMP_SYSTEM_RESET);
}
void qmp_system_powerdown(Error **errp)
{
qemu_system_powerdown_request();
}
void qmp_cont(Error **errp)
{
BlockBackend *blk;
BlockJob *job;
Error *local_err = NULL;
/* if there is a dump in background, we should wait until the dump
* finished */
if (qemu_system_dump_in_progress()) {
error_setg(errp, "There is a dump in process, please wait.");
return;
}
if (runstate_needs_reset()) {
error_setg(errp, "Resetting the Virtual Machine is required");
return;
} else if (runstate_check(RUN_STATE_SUSPENDED)) {
return;
} else if (runstate_check(RUN_STATE_FINISH_MIGRATE)) {
error_setg(errp, "Migration is not finalized yet");
return;
}
for (blk = blk_next(NULL); blk; blk = blk_next(blk)) {
blk_iostatus_reset(blk);
}
for (job = block_job_next(NULL); job; job = block_job_next(job)) {
block_job_iostatus_reset(job);
}
/* Continuing after completed migration. Images have been inactivated to
* allow the destination to take control. Need to get control back now.
*
* If there are no inactive block nodes (e.g. because the VM was just
* paused rather than completing a migration), bdrv_inactivate_all() simply
* doesn't do anything. */
bdrv_activate_all(&local_err);
if (local_err) {
error_propagate(errp, local_err);
return;
}
if (runstate_check(RUN_STATE_INMIGRATE)) {
autostart = 1;
} else {
vm_start();
}
}
void qmp_system_wakeup(Error **errp)
{
if (!qemu_wakeup_suspend_enabled()) {
error_setg(errp,
"wake-up from suspend is not supported by this guest");
return;
}
qemu_system_wakeup_request(QEMU_WAKEUP_REASON_OTHER, errp);
}
void qmp_set_password(SetPasswordOptions *opts, Error **errp)
{
int rc;
if (opts->protocol == DISPLAY_PROTOCOL_SPICE) {
if (!qemu_using_spice(errp)) {
return;
}
rc = qemu_spice.set_passwd(opts->password,
opts->connected == SET_PASSWORD_ACTION_FAIL,
opts->connected == SET_PASSWORD_ACTION_DISCONNECT);
} else {
assert(opts->protocol == DISPLAY_PROTOCOL_VNC);
if (opts->connected != SET_PASSWORD_ACTION_KEEP) {
/* vnc supports "connected=keep" only */
error_setg(errp, QERR_INVALID_PARAMETER, "connected");
return;
}
/* Note that setting an empty password will not disable login through
* this interface. */
rc = vnc_display_password(opts->u.vnc.display, opts->password);
}
if (rc != 0) {
error_setg(errp, "Could not set password");
}
}
void qmp_expire_password(ExpirePasswordOptions *opts, Error **errp)
{
time_t when;
int rc;
const char *whenstr = opts->time;
if (strcmp(whenstr, "now") == 0) {
when = 0;
} else if (strcmp(whenstr, "never") == 0) {
when = TIME_MAX;
} else if (whenstr[0] == '+') {
when = time(NULL) + strtoull(whenstr+1, NULL, 10);
} else {
when = strtoull(whenstr, NULL, 10);
}
if (opts->protocol == DISPLAY_PROTOCOL_SPICE) {
if (!qemu_using_spice(errp)) {
return;
}
rc = qemu_spice.set_pw_expire(when);
} else {
assert(opts->protocol == DISPLAY_PROTOCOL_VNC);
rc = vnc_display_pw_expire(opts->u.vnc.display, when);
}
if (rc != 0) {
error_setg(errp, "Could not set password expire time");
}
}
#ifdef CONFIG_VNC
void qmp_change_vnc_password(const char *password, Error **errp)
{
if (vnc_display_password(NULL, password) < 0) {
error_setg(errp, "Could not set password");
}
}
#endif
void qmp_add_client(const char *protocol, const char *fdname,
bool has_skipauth, bool skipauth, bool has_tls, bool tls,
Error **errp)
{
Chardev *s;
int fd;
fd = monitor_get_fd(monitor_cur(), fdname, errp);
if (fd < 0) {
return;
}
if (strcmp(protocol, "spice") == 0) {
if (!qemu_using_spice(errp)) {
close(fd);
return;
}
skipauth = has_skipauth ? skipauth : false;
tls = has_tls ? tls : false;
if (qemu_spice.display_add_client(fd, skipauth, tls) < 0) {
error_setg(errp, "spice failed to add client");
close(fd);
}
return;
#ifdef CONFIG_VNC
} else if (strcmp(protocol, "vnc") == 0) {
skipauth = has_skipauth ? skipauth : false;
vnc_display_add_client(NULL, fd, skipauth);
return;
#endif
#ifdef CONFIG_DBUS_DISPLAY
} else if (strcmp(protocol, "@dbus-display") == 0) {
if (!qemu_using_dbus_display(errp)) {
close(fd);
return;
}
if (!qemu_dbus_display.add_client(fd, errp)) {
close(fd);
return;
}
return;
#endif
} else if ((s = qemu_chr_find(protocol)) != NULL) {
if (qemu_chr_add_client(s, fd) < 0) {
error_setg(errp, "failed to add client");
close(fd);
return;
}
return;
}
error_setg(errp, "protocol '%s' is invalid", protocol);
close(fd);
}
MemoryDeviceInfoList *qmp_query_memory_devices(Error **errp)
{
return qmp_memory_device_list();
}
ACPIOSTInfoList *qmp_query_acpi_ospm_status(Error **errp)
{
bool ambig;
ACPIOSTInfoList *head = NULL;
ACPIOSTInfoList **prev = &head;
Object *obj = object_resolve_path_type("", TYPE_ACPI_DEVICE_IF, &ambig);
if (obj) {
AcpiDeviceIfClass *adevc = ACPI_DEVICE_IF_GET_CLASS(obj);
AcpiDeviceIf *adev = ACPI_DEVICE_IF(obj);
adevc->ospm_status(adev, &prev);
} else {
error_setg(errp, "command is not supported, missing ACPI device");
}
return head;
}
MemoryInfo *qmp_query_memory_size_summary(Error **errp)
{
MemoryInfo *mem_info = g_new0(MemoryInfo, 1);
MachineState *ms = MACHINE(qdev_get_machine());
mem_info->base_memory = ms->ram_size;
mem_info->plugged_memory = get_plugged_memory_size();
mem_info->has_plugged_memory =
mem_info->plugged_memory != (uint64_t)-1;
return mem_info;
}
void qmp_display_reload(DisplayReloadOptions *arg, Error **errp)
{
switch (arg->type) {
case DISPLAY_RELOAD_TYPE_VNC:
#ifdef CONFIG_VNC
if (arg->u.vnc.has_tls_certs && arg->u.vnc.tls_certs) {
vnc_display_reload_certs(NULL, errp);
}
#else
error_setg(errp, "vnc is invalid, missing 'CONFIG_VNC'");
#endif
break;
default:
abort();
}
}
void qmp_display_update(DisplayUpdateOptions *arg, Error **errp)
{
switch (arg->type) {
case DISPLAY_UPDATE_TYPE_VNC:
#ifdef CONFIG_VNC
vnc_display_update(&arg->u.vnc, errp);
#else
error_setg(errp, "vnc is invalid, missing 'CONFIG_VNC'");
#endif
break;
default:
abort();
}
}
static int qmp_x_query_rdma_foreach(Object *obj, void *opaque)
{
RdmaProvider *rdma;
RdmaProviderClass *k;
GString *buf = opaque;
if (object_dynamic_cast(obj, INTERFACE_RDMA_PROVIDER)) {
rdma = RDMA_PROVIDER(obj);
k = RDMA_PROVIDER_GET_CLASS(obj);
if (k->format_statistics) {
k->format_statistics(rdma, buf);
} else {
g_string_append_printf(buf,
"RDMA statistics not available for %s.\n",
object_get_typename(obj));
}
}
return 0;
}
HumanReadableText *qmp_x_query_rdma(Error **errp)
{
g_autoptr(GString) buf = g_string_new("");
object_child_foreach_recursive(object_get_root(),
qmp_x_query_rdma_foreach, buf);
return human_readable_text_from_str(buf);
}
HumanReadableText *qmp_x_query_ramblock(Error **errp)
{
g_autoptr(GString) buf = ram_block_format();
return human_readable_text_from_str(buf);
}
static int qmp_x_query_irq_foreach(Object *obj, void *opaque)
{
InterruptStatsProvider *intc;
InterruptStatsProviderClass *k;
GString *buf = opaque;
if (object_dynamic_cast(obj, TYPE_INTERRUPT_STATS_PROVIDER)) {
intc = INTERRUPT_STATS_PROVIDER(obj);
k = INTERRUPT_STATS_PROVIDER_GET_CLASS(obj);
uint64_t *irq_counts;
unsigned int nb_irqs, i;
if (k->get_statistics &&
k->get_statistics(intc, &irq_counts, &nb_irqs)) {
if (nb_irqs > 0) {
g_string_append_printf(buf, "IRQ statistics for %s:\n",
object_get_typename(obj));
for (i = 0; i < nb_irqs; i++) {
if (irq_counts[i] > 0) {
g_string_append_printf(buf, "%2d: %" PRId64 "\n", i,
irq_counts[i]);
}
}
}
} else {
g_string_append_printf(buf,
"IRQ statistics not available for %s.\n",
object_get_typename(obj));
}
}
return 0;
}
HumanReadableText *qmp_x_query_irq(Error **errp)
{
g_autoptr(GString) buf = g_string_new("");
object_child_foreach_recursive(object_get_root(),
qmp_x_query_irq_foreach, buf);
return human_readable_text_from_str(buf);
}
typedef struct StatsCallbacks {
StatsProvider provider;
StatRetrieveFunc *stats_cb;
SchemaRetrieveFunc *schemas_cb;
QTAILQ_ENTRY(StatsCallbacks) next;
} StatsCallbacks;
static QTAILQ_HEAD(, StatsCallbacks) stats_callbacks =
QTAILQ_HEAD_INITIALIZER(stats_callbacks);
void add_stats_callbacks(StatsProvider provider,
StatRetrieveFunc *stats_fn,
SchemaRetrieveFunc *schemas_fn)
{
StatsCallbacks *entry = g_new(StatsCallbacks, 1);
entry->provider = provider;
entry->stats_cb = stats_fn;
entry->schemas_cb = schemas_fn;
QTAILQ_INSERT_TAIL(&stats_callbacks, entry, next);
}
static bool invoke_stats_cb(StatsCallbacks *entry,
StatsResultList **stats_results,
StatsFilter *filter, StatsRequest *request,
Error **errp)
{
strList *targets = NULL;
strList *names = NULL;
ERRP_GUARD();
if (request) {
if (request->provider != entry->provider) {
return true;
}
if (request->has_names && !request->names) {
return true;
}
names = request->has_names ? request->names : NULL;
}
switch (filter->target) {
case STATS_TARGET_VM:
break;
case STATS_TARGET_VCPU:
if (filter->u.vcpu.has_vcpus) {
if (!filter->u.vcpu.vcpus) {
/* No targets allowed? Return no statistics. */
return true;
}
targets = filter->u.vcpu.vcpus;
}
break;
default:
abort();
}
entry->stats_cb(stats_results, filter->target, names, targets, errp);
if (*errp) {
qapi_free_StatsResultList(*stats_results);
*stats_results = NULL;
return false;
}
return true;
}
StatsResultList *qmp_query_stats(StatsFilter *filter, Error **errp)
{
StatsResultList *stats_results = NULL;
StatsCallbacks *entry;
StatsRequestList *request;
QTAILQ_FOREACH(entry, &stats_callbacks, next) {
if (filter->has_providers) {
for (request = filter->providers; request; request = request->next) {
if (!invoke_stats_cb(entry, &stats_results, filter,
request->value, errp)) {
break;
}
}
} else {
if (!invoke_stats_cb(entry, &stats_results, filter, NULL, errp)) {
break;
}
}
}
return stats_results;
}
StatsSchemaList *qmp_query_stats_schemas(bool has_provider,
StatsProvider provider,
Error **errp)
{
StatsSchemaList *stats_results = NULL;
StatsCallbacks *entry;
ERRP_GUARD();
QTAILQ_FOREACH(entry, &stats_callbacks, next) {
if (!has_provider || provider == entry->provider) {
entry->schemas_cb(&stats_results, errp);
if (*errp) {
qapi_free_StatsSchemaList(stats_results);
return NULL;
}
}
}
return stats_results;
}
void add_stats_entry(StatsResultList **stats_results, StatsProvider provider,
const char *qom_path, StatsList *stats_list)
{
StatsResult *entry = g_new0(StatsResult, 1);
entry->provider = provider;
if (qom_path) {
entry->has_qom_path = true;
entry->qom_path = g_strdup(qom_path);
}
entry->stats = stats_list;
QAPI_LIST_PREPEND(*stats_results, entry);
}
void add_stats_schema(StatsSchemaList **schema_results,
StatsProvider provider, StatsTarget target,
StatsSchemaValueList *stats_list)
{
StatsSchema *entry = g_new0(StatsSchema, 1);
entry->provider = provider;
entry->target = target;
entry->stats = stats_list;
QAPI_LIST_PREPEND(*schema_results, entry);
}
bool apply_str_list_filter(const char *string, strList *list)
{
strList *str_list = NULL;
if (!list) {
return true;
}
for (str_list = list; str_list; str_list = str_list->next) {
if (g_str_equal(string, str_list->value)) {
return true;
}
}
return false;
}
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