@@ -46,6 +46,7 @@ virtio_balloon_handle_output(const char *name, uint64_t gpa) "section name: %s g
virtio_balloon_get_config(uint32_t num_pages, uint32_t actual) "num_pages: %d actual: %d"
virtio_balloon_set_config(uint32_t actual, uint32_t oldactual) "actual: %d oldactual: %d"
virtio_balloon_to_target(uint64_t target, uint32_t num_pages) "balloon target: 0x%"PRIx64" num_pages: %d"
+virtio_bubble_handle_output(const char *name, uint64_t gpa, uint64_t size) "section name: %s gpa: 0x%" PRIx64 " size: %" PRIx64
# virtio-mmio.c
virtio_mmio_read(uint64_t offset) "virtio_mmio_read offset 0x%" PRIx64
@@ -328,6 +328,75 @@ static void balloon_stats_set_poll_interval(Object *obj, Visitor *v,
balloon_stats_change_timer(s, 0);
}
+static void bubble_inflate_page(VirtIOBalloon *balloon,
+ MemoryRegion *mr, hwaddr offset, size_t size)
+{
+ void *addr = memory_region_get_ram_ptr(mr) + offset;
+ ram_addr_t ram_offset;
+ size_t rb_page_size;
+ RAMBlock *rb;
+
+ rb = qemu_ram_block_from_host(addr, false, &ram_offset);
+ rb_page_size = qemu_ram_pagesize(rb);
+
+ /* For now we will simply ignore unaligned memory regions */
+ if ((ram_offset | size) & (rb_page_size - 1))
+ return;
+
+ ram_block_discard_range(rb, ram_offset, size);
+}
+
+static void virtio_bubble_handle_output(VirtIODevice *vdev, VirtQueue *vq)
+{
+ VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
+ VirtQueueElement *elem;
+ MemoryRegionSection section;
+
+ for (;;) {
+ size_t offset = 0;
+ uint64_t pa_order;
+
+ elem = virtqueue_pop(vq, sizeof(VirtQueueElement));
+ if (!elem) {
+ return;
+ }
+
+ while (iov_to_buf(elem->out_sg, elem->out_num, offset, &pa_order, 8) == 8) {
+ hwaddr pa = virtio_ldq_p(vdev, &pa_order);
+ size_t size = 1ul << (VIRTIO_BALLOON_PFN_SHIFT + (pa & 0xFF));
+
+ pa -= pa & 0xFF;
+ offset += 8;
+
+ if (qemu_balloon_is_inhibited())
+ continue;
+
+ section = memory_region_find(get_system_memory(), pa, size);
+ if (!section.mr) {
+ trace_virtio_balloon_bad_addr(pa);
+ continue;
+ }
+
+ if (!memory_region_is_ram(section.mr) ||
+ memory_region_is_rom(section.mr) ||
+ memory_region_is_romd(section.mr)) {
+ trace_virtio_balloon_bad_addr(pa);
+ } else {
+ trace_virtio_bubble_handle_output(memory_region_name(section.mr),
+ pa, size);
+ bubble_inflate_page(s, section.mr,
+ section.offset_within_region, size);
+ }
+
+ memory_region_unref(section.mr);
+ }
+
+ virtqueue_push(vq, elem, offset);
+ virtio_notify(vdev, vq);
+ g_free(elem);
+ }
+}
+
static void virtio_balloon_handle_output(VirtIODevice *vdev, VirtQueue *vq)
{
VirtIOBalloon *s = VIRTIO_BALLOON(vdev);
@@ -694,6 +763,7 @@ static uint64_t virtio_balloon_get_features(VirtIODevice *vdev, uint64_t f,
VirtIOBalloon *dev = VIRTIO_BALLOON(vdev);
f |= dev->host_features;
virtio_add_feature(&f, VIRTIO_BALLOON_F_STATS_VQ);
+ virtio_add_feature(&f, VIRTIO_BALLOON_F_HINTING);
return f;
}
@@ -780,6 +850,7 @@ static void virtio_balloon_device_realize(DeviceState *dev, Error **errp)
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);
+ s->hvq = virtio_add_queue(vdev, 128, virtio_bubble_handle_output);
if (virtio_has_feature(s->host_features,
VIRTIO_BALLOON_F_FREE_PAGE_HINT)) {
@@ -875,6 +946,8 @@ static void virtio_balloon_instance_init(Object *obj)
object_property_add(obj, "guest-stats", "guest statistics",
balloon_stats_get_all, NULL, NULL, s, NULL);
+ object_property_add(obj, "guest-page-hinting", "guest page hinting",
+ NULL, NULL, NULL, s, NULL);
object_property_add(obj, "guest-stats-polling-interval", "int",
balloon_stats_get_poll_interval,
@@ -44,7 +44,7 @@ enum virtio_balloon_free_page_report_status {
typedef struct VirtIOBalloon {
VirtIODevice parent_obj;
- VirtQueue *ivq, *dvq, *svq, *free_page_vq;
+ VirtQueue *ivq, *dvq, *svq, *hvq, *free_page_vq;
uint32_t free_page_report_status;
uint32_t num_pages;
uint32_t actual;
@@ -36,6 +36,7 @@
#define VIRTIO_BALLOON_F_DEFLATE_ON_OOM 2 /* Deflate balloon on OOM */
#define VIRTIO_BALLOON_F_FREE_PAGE_HINT 3 /* VQ to report free pages */
#define VIRTIO_BALLOON_F_PAGE_POISON 4 /* Guest is using page poisoning */
+#define VIRTIO_BALLOON_F_HINTING 5 /* Page hinting virtqueue */
/* Size of a PFN in the balloon interface. */
#define VIRTIO_BALLOON_PFN_SHIFT 12