/*
- * Virtio Block Device
+ * Virtio Balloon Device
*
* Copyright IBM, Corp. 2008
+ * Copyright (C) 2011 Red Hat, Inc.
+ * Copyright (C) 2011 Amit Shah <amit.shah@redhat.com>
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
#include "qemu-common.h"
#include "virtio.h"
#include "pc.h"
-#include "sysemu.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;
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;
static VirtIOBalloon *to_virtio_balloon(VirtIODevice *vdev)
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);
}
}
-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);
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)
VirtIOBalloon *dev = to_virtio_balloon(vdev);
struct virtio_balloon_config config;
memcpy(&config, config_data, 8);
- dev->actual = config.actual;
+ dev->actual = le32_to_cpu(config.actual);
}
static uint32_t virtio_balloon_get_features(VirtIODevice *vdev, uint32_t f)
return f;
}
-static void virtio_balloon_to_target(void *opaque, ram_addr_t target,
- MonitorCompletion cb, void *cb_data)
+static void virtio_balloon_stat(void *opaque, BalloonInfo *info)
{
VirtIOBalloon *dev = opaque;
- if (target > ram_size)
- target = ram_size;
+#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->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);
+
+ info->actual = ram_size - ((uint64_t) dev->actual <<
+ VIRTIO_BALLOON_PFN_SHIFT);
+}
+static void virtio_balloon_to_target(void *opaque, ram_addr_t target)
+{
+ VirtIOBalloon *dev = opaque;
+
+ if (target > ram_size) {
+ target = ram_size;
+ }
if (target) {
dev->num_pages = (ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT;
virtio_notify_config(&dev->vdev);
- } else {
- /* For now, only allow one request at a time. This restriction can be
- * removed later by queueing callback and data pairs.
- */
- 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))) {
- virtqueue_push(dev->svq, &dev->stats_vq_elem, dev->stats_vq_offset);
- virtio_notify(&dev->vdev, dev->svq);
- } else {
- /* 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);
- }
}
}
VirtIODevice *virtio_balloon_init(DeviceState *dev)
{
VirtIOBalloon *s;
+ int ret;
s = (VirtIOBalloon *)virtio_common_init("virtio-balloon",
VIRTIO_ID_BALLOON,
s->vdev.set_config = virtio_balloon_set_config;
s->vdev.get_features = virtio_balloon_get_features;
+ ret = qemu_add_balloon_handler(virtio_balloon_to_target,
+ virtio_balloon_stat, s);
+ if (ret < 0) {
+ virtio_cleanup(&s->vdev);
+ return NULL;
+ }
+
s->ivq = virtio_add_queue(&s->vdev, 128, virtio_balloon_handle_output);
s->dvq = virtio_add_queue(&s->vdev, 128, virtio_balloon_handle_output);
s->svq = virtio_add_queue(&s->vdev, 128, virtio_balloon_receive_stats);
reset_stats(s);
- qemu_add_balloon_handler(virtio_balloon_to_target, s);
+ s->qdev = dev;
register_savevm(dev, "virtio-balloon", -1, 1,
virtio_balloon_save, virtio_balloon_load, s);
return &s->vdev;
}
+
+void virtio_balloon_exit(VirtIODevice *vdev)
+{
+ VirtIOBalloon *s = DO_UPCAST(VirtIOBalloon, vdev, vdev);
+
+ qemu_remove_balloon_handler(s);
+ unregister_savevm(s->qdev, "virtio-balloon", s);
+ virtio_cleanup(vdev);
+}
projects / sdk / emulator / qemu.git / blobdiff