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qapi: Convert query-balloon

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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
Download patch file Download diff file Expand all files Collapse all files

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)