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qapi: Convert query-balloon 

Please, note that some of the code supporting memory statistics is
still around (eg. virtio_balloon_receive_stats() and reset_stats()).

Also, the qmp_query_balloon() function is synchronous and thus doesn't
make any use of the (not fully working) monitor's asynchronous command
support (the old non-qapi implementation did).

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
This commit is contained in:
Luiz Capitulino 2011-10-21 11:41:37 -02:00
parent d1f29646f2
commit 96637bcdf9
8 changed files with 120 additions and 138 deletions
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72
balloon.c
View File

@ -25,12 +25,11 @@
*/
#include "monitor.h"
#include "qjson.h"
#include "qint.h"
#include "cpu-common.h"
#include "kvm.h"
#include "balloon.h"
#include "trace.h"
#include "qmp-commands.h"
static QEMUBalloonEvent *balloon_event_fn;
static QEMUBalloonStatus *balloon_stat_fn;
@ -72,76 +71,33 @@ static int qemu_balloon(ram_addr_t target)
return 1;
}
static int qemu_balloon_status(MonitorCompletion cb, void *opaque)
static int qemu_balloon_status(BalloonInfo *info)
{
if (!balloon_stat_fn) {
return 0;
}
balloon_stat_fn(balloon_opaque, cb, opaque);
balloon_stat_fn(balloon_opaque, info);
return 1;
}
static void print_balloon_stat(const char *key, QObject *obj, void *opaque)
BalloonInfo *qmp_query_balloon(Error **errp)
{
Monitor *mon = opaque;
if (strcmp(key, "actual")) {
monitor_printf(mon, ",%s=%" PRId64, key,
qint_get_int(qobject_to_qint(obj)));
}
}
void monitor_print_balloon(Monitor *mon, const QObject *data)
{
QDict *qdict;
qdict = qobject_to_qdict(data);
if (!qdict_haskey(qdict, "actual")) {
return;
}
monitor_printf(mon, "balloon: actual=%" PRId64,
qdict_get_int(qdict, "actual") >> 20);
qdict_iter(qdict, print_balloon_stat, mon);
monitor_printf(mon, "\n");
}
/**
* do_info_balloon(): Balloon information
*
* Make an asynchronous request for balloon info. When the request completes
* a QDict will be returned according to the following specification:
*
* - "actual": current balloon value in bytes
* The following fields may or may not be present:
* - "mem_swapped_in": Amount of memory swapped in (bytes)
* - "mem_swapped_out": Amount of memory swapped out (bytes)
* - "major_page_faults": Number of major faults
* - "minor_page_faults": Number of minor faults
* - "free_mem": Total amount of free and unused memory (bytes)
* - "total_mem": Total amount of available memory (bytes)
*
* Example:
*
* { "actual": 1073741824, "mem_swapped_in": 0, "mem_swapped_out": 0,
* "major_page_faults": 142, "minor_page_faults": 239245,
* "free_mem": 1014185984, "total_mem": 1044668416 }
*/
int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque)
{
int ret;
BalloonInfo *info;
if (kvm_enabled() && !kvm_has_sync_mmu()) {
qerror_report(QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
return -1;
error_set(errp, QERR_KVM_MISSING_CAP, "synchronous MMU", "balloon");
return NULL;
}
ret = qemu_balloon_status(cb, opaque);
if (!ret) {
qerror_report(QERR_DEVICE_NOT_ACTIVE, "balloon");
return -1;
info = g_malloc0(sizeof(*info));
if (qemu_balloon_status(info) == 0) {
error_set(errp, QERR_DEVICE_NOT_ACTIVE, "balloon");
qapi_free_BalloonInfo(info);
return NULL;
}
return 0;
return info;
}
/**

6
balloon.h
View File

@ -15,17 +15,15 @@
#define _QEMU_BALLOON_H
#include "monitor.h"
#include "qapi-types.h"
typedef void (QEMUBalloonEvent)(void *opaque, ram_addr_t target);
typedef void (QEMUBalloonStatus)(void *opaque, MonitorCompletion cb,
void *cb_data);
typedef void (QEMUBalloonStatus)(void *opaque, BalloonInfo *info);
int qemu_add_balloon_handler(QEMUBalloonEvent *event_func,
QEMUBalloonStatus *stat_func, void *opaque);
void qemu_remove_balloon_handler(void *opaque);
void monitor_print_balloon(Monitor *mon, const QObject *data);
int do_info_balloon(Monitor *mon, MonitorCompletion cb, void *opaque);
int do_balloon(Monitor *mon, const QDict *params,
MonitorCompletion cb, void *opaque);

39
hmp.c
View File

@ -349,6 +349,45 @@ out:
qapi_free_SpiceInfo(info);
}
void hmp_info_balloon(Monitor *mon)
{
BalloonInfo *info;
Error *err = NULL;
info = qmp_query_balloon(&err);
if (err) {
monitor_printf(mon, "%s\n", error_get_pretty(err));
error_free(err);
return;
}
monitor_printf(mon, "balloon: actual=%" PRId64, info->actual >> 20);
if (info->has_mem_swapped_in) {
monitor_printf(mon, " mem_swapped_in=%" PRId64, info->mem_swapped_in);
}
if (info->has_mem_swapped_out) {
monitor_printf(mon, " mem_swapped_out=%" PRId64, info->mem_swapped_out);
}
if (info->has_major_page_faults) {
monitor_printf(mon, " major_page_faults=%" PRId64,
info->major_page_faults);
}
if (info->has_minor_page_faults) {
monitor_printf(mon, " minor_page_faults=%" PRId64,
info->minor_page_faults);
}
if (info->has_free_mem) {
monitor_printf(mon, " free_mem=%" PRId64, info->free_mem);
}
if (info->has_total_mem) {
monitor_printf(mon, " total_mem=%" PRId64, info->total_mem);
}
monitor_printf(mon, "\n");
qapi_free_BalloonInfo(info);
}
void hmp_quit(Monitor *mon, const QDict *qdict)
{
monitor_suspend(mon);

1
hmp.h
View File

@ -30,6 +30,7 @@ void hmp_info_block(Monitor *mon);
void hmp_info_blockstats(Monitor *mon);
void hmp_info_vnc(Monitor *mon);
void hmp_info_spice(Monitor *mon);
void hmp_info_balloon(Monitor *mon);
void hmp_quit(Monitor *mon, const QDict *qdict);
void hmp_stop(Monitor *mon, const QDict *qdict);
void hmp_system_reset(Monitor *mon, const QDict *qdict);

78
hw/virtio-balloon.c
View File

@ -18,22 +18,14 @@
#include "virtio.h"
#include "pc.h"
#include "cpu.h"
#include "monitor.h"
#include "balloon.h"
#include "virtio-balloon.h"
#include "kvm.h"
#include "qlist.h"
#include "qint.h"
#include "qstring.h"
#if defined(__linux__)
#include <sys/mman.h>
#endif
/* Disable guest-provided stats by now (https://bugzilla.redhat.com/show_bug.cgi?id=623903) */
#define ENABLE_GUEST_STATS 0
typedef struct VirtIOBalloon
{
VirtIODevice vdev;
@ -43,8 +35,6 @@ typedef struct VirtIOBalloon
uint64_t stats[VIRTIO_BALLOON_S_NR];
VirtQueueElement stats_vq_elem;
size_t stats_vq_offset;
MonitorCompletion *stats_callback;
void *stats_opaque_callback_data;
DeviceState *qdev;
} VirtIOBalloon;
@ -76,31 +66,6 @@ static inline void reset_stats(VirtIOBalloon *dev)
for (i = 0; i < VIRTIO_BALLOON_S_NR; dev->stats[i++] = -1);
}
static void stat_put(QDict *dict, const char *label, uint64_t val)
{
if (val != -1)
qdict_put(dict, label, qint_from_int(val));
}
static QObject *get_stats_qobject(VirtIOBalloon *dev)
{
QDict *dict = qdict_new();
uint64_t actual = ram_size - ((uint64_t) dev->actual <<
VIRTIO_BALLOON_PFN_SHIFT);
stat_put(dict, "actual", actual);
#if ENABLE_GUEST_STATS
stat_put(dict, "mem_swapped_in", dev->stats[VIRTIO_BALLOON_S_SWAP_IN]);
stat_put(dict, "mem_swapped_out", dev->stats[VIRTIO_BALLOON_S_SWAP_OUT]);
stat_put(dict, "major_page_faults", dev->stats[VIRTIO_BALLOON_S_MAJFLT]);
stat_put(dict, "minor_page_faults", dev->stats[VIRTIO_BALLOON_S_MINFLT]);
stat_put(dict, "free_mem", dev->stats[VIRTIO_BALLOON_S_MEMFREE]);
stat_put(dict, "total_mem", dev->stats[VIRTIO_BALLOON_S_MEMTOT]);
#endif
return QOBJECT(dict);
}
static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOBalloon *s = to_virtio_balloon(vdev);
@ -131,20 +96,6 @@ static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq)
}
}
static void complete_stats_request(VirtIOBalloon *vb)
{
QObject *stats;
if (!vb->stats_opaque_callback_data)
return;
stats = get_stats_qobject(vb);
vb->stats_callback(vb->stats_opaque_callback_data, stats);
qobject_decref(stats);
vb->stats_opaque_callback_data = NULL;
vb->stats_callback = NULL;
}
static void virtio_balloon_receive_stats(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOBalloon *s = DO_UPCAST(VirtIOBalloon, vdev, vdev);
@ -172,8 +123,6 @@ static void virtio_balloon_receive_stats(VirtIODevice *vdev, VirtQueue *vq)
s->stats[tag] = val;
}
s->stats_vq_offset = offset;
complete_stats_request(s);
}
static void virtio_balloon_get_config(VirtIODevice *vdev, uint8_t *config_data)
@ -202,32 +151,33 @@ static uint32_t virtio_balloon_get_features(VirtIODevice *vdev, uint32_t f)
return f;
}
static void virtio_balloon_stat(void *opaque, MonitorCompletion cb,
void *cb_data)
static void virtio_balloon_stat(void *opaque, BalloonInfo *info)
{
VirtIOBalloon *dev = opaque;
/* For now, only allow one request at a time. This restriction can be
* removed later by queueing callback and data pairs.
#if 0
/* Disable guest-provided stats for now. For more details please check:
* https://bugzilla.redhat.com/show_bug.cgi?id=623903
*
* If you do enable it (which is probably not going to happen as we
* need a new command for it), remember that you also need to fill the
* appropriate members of the BalloonInfo structure so that the stats
* are returned to the client.
*/
if (dev->stats_callback != NULL) {
return;
}
dev->stats_callback = cb;
dev->stats_opaque_callback_data = cb_data;
if (ENABLE_GUEST_STATS
&& (dev->vdev.guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ))) {
if (dev->vdev.guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ)) {
virtqueue_push(dev->svq, &dev->stats_vq_elem, dev->stats_vq_offset);
virtio_notify(&dev->vdev, dev->svq);
return;
}
#endif
/* Stats are not supported. Clear out any stale values that might
* have been set by a more featureful guest kernel.
*/
reset_stats(dev);
complete_stats_request(dev);
info->actual = ram_size - ((uint64_t) dev->actual <<
VIRTIO_BALLOON_PFN_SHIFT);
}
static void virtio_balloon_to_target(void *opaque, ram_addr_t target)

13
monitor.c
View File

@ -2904,9 +2904,7 @@ static const mon_cmd_t info_cmds[] = {
.args_type = "",
.params = "",
.help = "show balloon information",
.user_print = monitor_print_balloon,
.mhandler.info_async = do_info_balloon,
.flags = MONITOR_CMD_ASYNC,
.mhandler.info = hmp_info_balloon,
},
{
.name = "qtree",
@ -2964,15 +2962,6 @@ static const mon_cmd_t qmp_query_cmds[] = {
.user_print = do_pci_info_print,
.mhandler.info_new = do_pci_info,
},
{
.name = "balloon",
.args_type = "",
.params = "",
.help = "show balloon information",
.user_print = monitor_print_balloon,
.mhandler.info_async = do_info_balloon,
.flags = MONITOR_CMD_ASYNC,
},
{ /* NULL */ },
};

44
qapi-schema.json
View File

@ -658,6 +658,50 @@
##
{ 'command': 'query-spice', 'returns': 'SpiceInfo' }
##
# @BalloonInfo:
#
# Information about the guest balloon device.
#
# @actual: the number of bytes the balloon currently contains
#
# @mem_swapped_in: #optional number of pages swapped in within the guest
#
# @mem_swapped_out: #optional number of pages swapped out within the guest
#
# @major_page_faults: #optional number of major page faults within the guest
#
# @minor_page_faults: #optional number of minor page faults within the guest
#
# @free_mem: #optional amount of memory (in bytes) free in the guest
#
# @total_mem: #optional amount of memory (in bytes) visible to the guest
#
# Since: 0.14.0
#
# Notes: all current versions of QEMU do not fill out optional information in
# this structure.
##
{ 'type': 'BalloonInfo',
'data': {'actual': 'int', '*mem_swapped_in': 'int',
'*mem_swapped_out': 'int', '*major_page_faults': 'int',
'*minor_page_faults': 'int', '*free_mem': 'int',
'*total_mem': 'int'} }
##
# @query-balloon:
#
# Return information about the balloon device.
#
# Returns: @BalloonInfo on success
# If the balloon driver is enabled but not functional because the KVM
# kernel module cannot support it, KvmMissingCap
# If no balloon device is present, DeviceNotActive
#
# Since: 0.14.0
##
{ 'command': 'query-balloon', 'returns': 'BalloonInfo' }
##
# @quit:
#

5
qmp-commands.hx
View File

@ -1989,3 +1989,8 @@ Example:
EQMP
{
.name = "query-balloon",
.args_type = "",
.mhandler.cmd_new = qmp_marshal_input_query_balloon,
},