virtio-balloon: use standard headers

Drop code duplicated from standard headers.
Signed-off-by: NMichael S. Tsirkin <mst@redhat.com>
Reviewed-by: NThomas Huth <thuth@linux.vnet.ibm.com>
Reviewed-by: NThomas Huth <thuth@linux.vnet.ibm.com>

include/hw/virtio/virtio-balloon.h

@@ -15,6 +15,7 @@
 #ifndef _QEMU_VIRTIO_BALLOON_H
 #define _QEMU_VIRTIO_BALLOON_H
 
+#include "standard-headers/linux/virtio_balloon.h"
 #include "hw/virtio/virtio.h"
 #include "hw/pci/pci.h"
 
@@ -22,39 +23,7 @@
 #define VIRTIO_BALLOON(obj) \
         OBJECT_CHECK(VirtIOBalloon, (obj), TYPE_VIRTIO_BALLOON)
 
-/* from Linux's linux/virtio_balloon.h */
-
-/* The ID for virtio_balloon */
-#define VIRTIO_ID_BALLOON 5
-
-/* The feature bitmap for virtio balloon */
-#define VIRTIO_BALLOON_F_MUST_TELL_HOST 0 /* Tell before reclaiming pages */
-#define VIRTIO_BALLOON_F_STATS_VQ 1       /* Memory stats virtqueue */
-
-/* Size of a PFN in the balloon interface. */
-#define VIRTIO_BALLOON_PFN_SHIFT 12
-
-struct virtio_balloon_config
-{
-    /* Number of pages host wants Guest to give up. */
-    uint32_t num_pages;
-    /* Number of pages we've actually got in balloon. */
-    uint32_t actual;
-};
-
-/* Memory Statistics */
-#define VIRTIO_BALLOON_S_SWAP_IN  0   /* Amount of memory swapped in */
-#define VIRTIO_BALLOON_S_SWAP_OUT 1   /* Amount of memory swapped out */
-#define VIRTIO_BALLOON_S_MAJFLT   2   /* Number of major faults */
-#define VIRTIO_BALLOON_S_MINFLT   3   /* Number of minor faults */
-#define VIRTIO_BALLOON_S_MEMFREE  4   /* Total amount of free memory */
-#define VIRTIO_BALLOON_S_MEMTOT   5   /* Total amount of memory */
-#define VIRTIO_BALLOON_S_NR       6
-
-typedef struct VirtIOBalloonStat {
-    uint16_t tag;
-    uint64_t val;
-} QEMU_PACKED VirtIOBalloonStat;
+typedef struct virtio_balloon_stat VirtIOBalloonStat;
 
 typedef struct VirtIOBalloon {
     VirtIODevice parent_obj;