mirror of
https://gitlab.com/qemu-project/qemu
synced 2024-11-05 20:35:44 +00:00
6a1a8cc7af
This clean the init and the exit functions and rename virtio_common_cleanup to virtio_cleanup. Signed-off-by: KONRAD Frederic <fred.konrad@greensocs.com> Message-id: 1366791683-5350-7-git-send-email-fred.konrad@greensocs.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
412 lines
12 KiB
C
412 lines
12 KiB
C
/*
|
|
* 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>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
*/
|
|
|
|
#include "qemu/iov.h"
|
|
#include "qemu/timer.h"
|
|
#include "qemu-common.h"
|
|
#include "hw/virtio/virtio.h"
|
|
#include "hw/i386/pc.h"
|
|
#include "cpu.h"
|
|
#include "sysemu/balloon.h"
|
|
#include "hw/virtio/virtio-balloon.h"
|
|
#include "sysemu/kvm.h"
|
|
#include "exec/address-spaces.h"
|
|
#include "qapi/visitor.h"
|
|
|
|
#if defined(__linux__)
|
|
#include <sys/mman.h>
|
|
#endif
|
|
|
|
#include "hw/virtio/virtio-bus.h"
|
|
|
|
static void balloon_page(void *addr, int deflate)
|
|
{
|
|
#if defined(__linux__)
|
|
if (!kvm_enabled() || kvm_has_sync_mmu())
|
|
qemu_madvise(addr, TARGET_PAGE_SIZE,
|
|
deflate ? QEMU_MADV_WILLNEED : QEMU_MADV_DONTNEED);
|
|
#endif
|
|
}
|
|
|
|
static const char *balloon_stat_names[] = {
|
|
[VIRTIO_BALLOON_S_SWAP_IN] = "stat-swap-in",
|
|
[VIRTIO_BALLOON_S_SWAP_OUT] = "stat-swap-out",
|
|
[VIRTIO_BALLOON_S_MAJFLT] = "stat-major-faults",
|
|
[VIRTIO_BALLOON_S_MINFLT] = "stat-minor-faults",
|
|
[VIRTIO_BALLOON_S_MEMFREE] = "stat-free-memory",
|
|
[VIRTIO_BALLOON_S_MEMTOT] = "stat-total-memory",
|
|
[VIRTIO_BALLOON_S_NR] = NULL
|
|
};
|
|
|
|
/*
|
|
* 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 bool balloon_stats_supported(const VirtIOBalloon *s)
|
|
{
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
return vdev->guest_features & (1 << VIRTIO_BALLOON_F_STATS_VQ);
|
|
}
|
|
|
|
static bool balloon_stats_enabled(const VirtIOBalloon *s)
|
|
{
|
|
return s->stats_poll_interval > 0;
|
|
}
|
|
|
|
static void balloon_stats_destroy_timer(VirtIOBalloon *s)
|
|
{
|
|
if (balloon_stats_enabled(s)) {
|
|
qemu_del_timer(s->stats_timer);
|
|
qemu_free_timer(s->stats_timer);
|
|
s->stats_timer = NULL;
|
|
s->stats_poll_interval = 0;
|
|
}
|
|
}
|
|
|
|
static void balloon_stats_change_timer(VirtIOBalloon *s, int secs)
|
|
{
|
|
qemu_mod_timer(s->stats_timer, qemu_get_clock_ms(vm_clock) + secs * 1000);
|
|
}
|
|
|
|
static void balloon_stats_poll_cb(void *opaque)
|
|
{
|
|
VirtIOBalloon *s = opaque;
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
if (!balloon_stats_supported(s)) {
|
|
/* re-schedule */
|
|
balloon_stats_change_timer(s, s->stats_poll_interval);
|
|
return;
|
|
}
|
|
|
|
virtqueue_push(s->svq, &s->stats_vq_elem, s->stats_vq_offset);
|
|
virtio_notify(vdev, s->svq);
|
|
}
|
|
|
|
static void balloon_stats_get_all(Object *obj, struct Visitor *v,
|
|
void *opaque, const char *name, Error **errp)
|
|
{
|
|
VirtIOBalloon *s = opaque;
|
|
int i;
|
|
|
|
if (!s->stats_last_update) {
|
|
error_setg(errp, "guest hasn't updated any stats yet");
|
|
return;
|
|
}
|
|
|
|
visit_start_struct(v, NULL, "guest-stats", name, 0, errp);
|
|
visit_type_int(v, &s->stats_last_update, "last-update", errp);
|
|
|
|
visit_start_struct(v, NULL, NULL, "stats", 0, errp);
|
|
for (i = 0; i < VIRTIO_BALLOON_S_NR; i++) {
|
|
visit_type_int64(v, (int64_t *) &s->stats[i], balloon_stat_names[i],
|
|
errp);
|
|
}
|
|
visit_end_struct(v, errp);
|
|
|
|
visit_end_struct(v, errp);
|
|
}
|
|
|
|
static void balloon_stats_get_poll_interval(Object *obj, struct Visitor *v,
|
|
void *opaque, const char *name,
|
|
Error **errp)
|
|
{
|
|
VirtIOBalloon *s = opaque;
|
|
visit_type_int(v, &s->stats_poll_interval, name, errp);
|
|
}
|
|
|
|
static void balloon_stats_set_poll_interval(Object *obj, struct Visitor *v,
|
|
void *opaque, const char *name,
|
|
Error **errp)
|
|
{
|
|
VirtIOBalloon *s = opaque;
|
|
int64_t value;
|
|
|
|
visit_type_int(v, &value, name, errp);
|
|
if (error_is_set(errp)) {
|
|
return;
|
|
}
|
|
|
|
if (value < 0) {
|
|
error_setg(errp, "timer value must be greater than zero");
|
|
return;
|
|
}
|
|
|
|
if (value == s->stats_poll_interval) {
|
|
return;
|
|
}
|
|
|
|
if (value == 0) {
|
|
/* timer=0 disables the timer */
|
|
balloon_stats_destroy_timer(s);
|
|
return;
|
|
}
|
|
|
|
if (balloon_stats_enabled(s)) {
|
|
/* timer interval change */
|
|
s->stats_poll_interval = value;
|
|
balloon_stats_change_timer(s, value);
|
|
return;
|
|
}
|
|
|
|
/* create a new timer */
|
|
g_assert(s->stats_timer == NULL);
|
|
s->stats_timer = qemu_new_timer_ms(vm_clock, balloon_stats_poll_cb, s);
|
|
s->stats_poll_interval = value;
|
|
balloon_stats_change_timer(s, 0);
|
|
}
|
|
|
|
static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
|
|
VirtQueueElement elem;
|
|
MemoryRegionSection section;
|
|
|
|
while (virtqueue_pop(vq, &elem)) {
|
|
size_t offset = 0;
|
|
uint32_t pfn;
|
|
|
|
while (iov_to_buf(elem.out_sg, elem.out_num, offset, &pfn, 4) == 4) {
|
|
ram_addr_t pa;
|
|
ram_addr_t addr;
|
|
|
|
pa = (ram_addr_t)ldl_p(&pfn) << VIRTIO_BALLOON_PFN_SHIFT;
|
|
offset += 4;
|
|
|
|
/* FIXME: remove get_system_memory(), but how? */
|
|
section = memory_region_find(get_system_memory(), pa, 1);
|
|
if (!section.size || !memory_region_is_ram(section.mr))
|
|
continue;
|
|
|
|
/* Using memory_region_get_ram_ptr is bending the rules a bit, but
|
|
should be OK because we only want a single page. */
|
|
addr = section.offset_within_region;
|
|
balloon_page(memory_region_get_ram_ptr(section.mr) + addr,
|
|
!!(vq == s->dvq));
|
|
}
|
|
|
|
virtqueue_push(vq, &elem, offset);
|
|
virtio_notify(vdev, vq);
|
|
}
|
|
}
|
|
|
|
static void virtio_balloon_receive_stats(VirtIODevice *vdev, VirtQueue *vq)
|
|
{
|
|
VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
|
|
VirtQueueElement *elem = &s->stats_vq_elem;
|
|
VirtIOBalloonStat stat;
|
|
size_t offset = 0;
|
|
qemu_timeval tv;
|
|
|
|
if (!virtqueue_pop(vq, elem)) {
|
|
goto out;
|
|
}
|
|
|
|
/* 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 (iov_to_buf(elem->out_sg, elem->out_num, offset, &stat, sizeof(stat))
|
|
== 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;
|
|
|
|
if (qemu_gettimeofday(&tv) < 0) {
|
|
fprintf(stderr, "warning: %s: failed to get time of day\n", __func__);
|
|
goto out;
|
|
}
|
|
|
|
s->stats_last_update = tv.tv_sec;
|
|
|
|
out:
|
|
if (balloon_stats_enabled(s)) {
|
|
balloon_stats_change_timer(s, s->stats_poll_interval);
|
|
}
|
|
}
|
|
|
|
static void virtio_balloon_get_config(VirtIODevice *vdev, uint8_t *config_data)
|
|
{
|
|
VirtIOBalloon *dev = VIRTIO_BALLOON(vdev);
|
|
struct virtio_balloon_config config;
|
|
|
|
config.num_pages = cpu_to_le32(dev->num_pages);
|
|
config.actual = cpu_to_le32(dev->actual);
|
|
|
|
memcpy(config_data, &config, 8);
|
|
}
|
|
|
|
static void virtio_balloon_set_config(VirtIODevice *vdev,
|
|
const uint8_t *config_data)
|
|
{
|
|
VirtIOBalloon *dev = VIRTIO_BALLOON(vdev);
|
|
struct virtio_balloon_config config;
|
|
uint32_t oldactual = dev->actual;
|
|
memcpy(&config, config_data, 8);
|
|
dev->actual = le32_to_cpu(config.actual);
|
|
if (dev->actual != oldactual) {
|
|
qemu_balloon_changed(ram_size -
|
|
((ram_addr_t) dev->actual << VIRTIO_BALLOON_PFN_SHIFT));
|
|
}
|
|
}
|
|
|
|
static uint32_t virtio_balloon_get_features(VirtIODevice *vdev, uint32_t f)
|
|
{
|
|
f |= (1 << VIRTIO_BALLOON_F_STATS_VQ);
|
|
return f;
|
|
}
|
|
|
|
static void virtio_balloon_stat(void *opaque, BalloonInfo *info)
|
|
{
|
|
VirtIOBalloon *dev = opaque;
|
|
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 = VIRTIO_BALLOON(opaque);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(dev);
|
|
|
|
if (target > ram_size) {
|
|
target = ram_size;
|
|
}
|
|
if (target) {
|
|
dev->num_pages = (ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT;
|
|
virtio_notify_config(vdev);
|
|
}
|
|
}
|
|
|
|
static void virtio_balloon_save(QEMUFile *f, void *opaque)
|
|
{
|
|
VirtIOBalloon *s = VIRTIO_BALLOON(opaque);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
|
|
virtio_save(vdev, f);
|
|
|
|
qemu_put_be32(f, s->num_pages);
|
|
qemu_put_be32(f, s->actual);
|
|
}
|
|
|
|
static int virtio_balloon_load(QEMUFile *f, void *opaque, int version_id)
|
|
{
|
|
VirtIOBalloon *s = VIRTIO_BALLOON(opaque);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(s);
|
|
int ret;
|
|
|
|
if (version_id != 1)
|
|
return -EINVAL;
|
|
|
|
ret = virtio_load(vdev, f);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
s->num_pages = qemu_get_be32(f);
|
|
s->actual = qemu_get_be32(f);
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_balloon_device_init(VirtIODevice *vdev)
|
|
{
|
|
DeviceState *qdev = DEVICE(vdev);
|
|
VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
|
|
int ret;
|
|
|
|
virtio_init(vdev, "virtio-balloon", VIRTIO_ID_BALLOON, 8);
|
|
|
|
ret = qemu_add_balloon_handler(virtio_balloon_to_target,
|
|
virtio_balloon_stat, s);
|
|
|
|
if (ret < 0) {
|
|
virtio_cleanup(VIRTIO_DEVICE(s));
|
|
return -1;
|
|
}
|
|
|
|
s->ivq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output);
|
|
s->dvq = virtio_add_queue(vdev, 128, virtio_balloon_handle_output);
|
|
s->svq = virtio_add_queue(vdev, 128, virtio_balloon_receive_stats);
|
|
|
|
register_savevm(qdev, "virtio-balloon", -1, 1,
|
|
virtio_balloon_save, virtio_balloon_load, s);
|
|
|
|
object_property_add(OBJECT(qdev), "guest-stats", "guest statistics",
|
|
balloon_stats_get_all, NULL, NULL, s, NULL);
|
|
|
|
object_property_add(OBJECT(qdev), "guest-stats-polling-interval", "int",
|
|
balloon_stats_get_poll_interval,
|
|
balloon_stats_set_poll_interval,
|
|
NULL, s, NULL);
|
|
return 0;
|
|
}
|
|
|
|
static int virtio_balloon_device_exit(DeviceState *qdev)
|
|
{
|
|
VirtIOBalloon *s = VIRTIO_BALLOON(qdev);
|
|
VirtIODevice *vdev = VIRTIO_DEVICE(qdev);
|
|
|
|
balloon_stats_destroy_timer(s);
|
|
qemu_remove_balloon_handler(s);
|
|
unregister_savevm(qdev, "virtio-balloon", s);
|
|
virtio_cleanup(vdev);
|
|
return 0;
|
|
}
|
|
|
|
static Property virtio_balloon_properties[] = {
|
|
DEFINE_PROP_END_OF_LIST(),
|
|
};
|
|
|
|
static void virtio_balloon_class_init(ObjectClass *klass, void *data)
|
|
{
|
|
DeviceClass *dc = DEVICE_CLASS(klass);
|
|
VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
|
|
dc->exit = virtio_balloon_device_exit;
|
|
dc->props = virtio_balloon_properties;
|
|
vdc->init = virtio_balloon_device_init;
|
|
vdc->get_config = virtio_balloon_get_config;
|
|
vdc->set_config = virtio_balloon_set_config;
|
|
vdc->get_features = virtio_balloon_get_features;
|
|
}
|
|
|
|
static const TypeInfo virtio_balloon_info = {
|
|
.name = TYPE_VIRTIO_BALLOON,
|
|
.parent = TYPE_VIRTIO_DEVICE,
|
|
.instance_size = sizeof(VirtIOBalloon),
|
|
.class_init = virtio_balloon_class_init,
|
|
};
|
|
|
|
static void virtio_register_types(void)
|
|
{
|
|
type_register_static(&virtio_balloon_info);
|
|
}
|
|
|
|
type_init(virtio_register_types)
|