#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>
typedef struct VirtIOBalloon
{
VirtIODevice vdev;
- VirtQueue *ivq, *dvq;
+ VirtQueue *ivq, *dvq, *svq;
uint32_t num_pages;
uint32_t actual;
+ uint64_t stats[VIRTIO_BALLOON_S_NR];
+ VirtQueueElement stats_vq_elem;
+ size_t stats_vq_offset;
+ MonitorCompletion *stats_callback;
+ void *stats_opaque_callback_data;
} VirtIOBalloon;
static VirtIOBalloon *to_virtio_balloon(VirtIODevice *vdev)
#endif
}
+/*
+ * reset_stats - Mark all items in the stats array as unset
+ *
+ * This function needs to be called at device intialization and before
+ * before updating to a set of newly-generated stats. This will ensure that no
+ * stale values stick around in case the guest reports a subset of the supported
+ * statistics.
+ */
+static inline void reset_stats(VirtIOBalloon *dev)
+{
+ int i;
+ 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();
+ uint32_t actual = ram_size - (dev->actual << VIRTIO_BALLOON_PFN_SHIFT);
+
+ stat_put(dict, "actual", actual);
+ 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]);
+
+ return QOBJECT(dict);
+}
+
/* FIXME: once we do a virtio refactoring, this will get subsumed into common
* code */
static size_t memcpy_from_iovector(void *data, size_t offset, size_t size,
}
}
+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);
+ VirtQueueElement *elem = &s->stats_vq_elem;
+ VirtIOBalloonStat stat;
+ size_t offset = 0;
+
+ if (!virtqueue_pop(vq, elem)) {
+ return;
+ }
+
+ /* Initialize the stats to get rid of any stale values. This is only
+ * needed to handle the case where a guest supports fewer stats than it
+ * used to (ie. it has booted into an old kernel).
+ */
+ reset_stats(s);
+
+ while (memcpy_from_iovector(&stat, offset, sizeof(stat), elem->out_sg,
+ elem->out_num) == sizeof(stat)) {
+ uint16_t tag = tswap16(stat.tag);
+ uint64_t val = tswap64(stat.val);
+
+ offset += sizeof(stat);
+ if (tag < VIRTIO_BALLOON_S_NR)
+ 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);
static uint32_t virtio_balloon_get_features(VirtIODevice *vdev, uint32_t f)
{
+ f |= (1 << VIRTIO_BALLOON_F_STATS_VQ);
return f;
}
-static ram_addr_t virtio_balloon_to_target(void *opaque, ram_addr_t target)
+static void virtio_balloon_to_target(void *opaque, ram_addr_t target,
+ MonitorCompletion cb, void *cb_data)
{
VirtIOBalloon *dev = opaque;
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 (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);
+ }
}
-
- return ram_size - (dev->actual << VIRTIO_BALLOON_PFN_SHIFT);
}
static void virtio_balloon_save(QEMUFile *f, void *opaque)
qemu_put_be32(f, s->num_pages);
qemu_put_be32(f, s->actual);
+ qemu_put_buffer(f, (uint8_t *)&s->stats_vq_elem, sizeof(VirtQueueElement));
+ qemu_put_buffer(f, (uint8_t *)&s->stats_vq_offset, sizeof(size_t));
+ qemu_put_buffer(f, (uint8_t *)&s->stats_callback, sizeof(MonitorCompletion));
+ qemu_put_buffer(f, (uint8_t *)&s->stats_opaque_callback_data, sizeof(void));
}
static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id)
s->num_pages = qemu_get_be32(f);
s->actual = qemu_get_be32(f);
+ qemu_get_buffer(f, (uint8_t *)&s->stats_vq_elem, sizeof(VirtQueueElement));
+ qemu_get_buffer(f, (uint8_t *)&s->stats_vq_offset, sizeof(size_t));
+ qemu_get_buffer(f, (uint8_t *)&s->stats_callback, sizeof(MonitorCompletion));
+ qemu_get_buffer(f, (uint8_t *)&s->stats_opaque_callback_data, sizeof(void));
return 0;
}
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);
register_savevm("virtio-balloon", -1, 1, virtio_balloon_save, virtio_balloon_load, s);
projects / mirror_qemu.git / blobdiff