query-balloon and "info balloon" should report total memory available to the
guest.
balloon inflate/ deflate can also use all memory available to the guest (initial
+ hotplugged memory)
Ballon driver has been minimaly tested with the patch, please review and test.
Caveat: if the guest does not online hotplugged-memory, it's easy for a balloon
inflate command to OOM a guest.
Signed-off-by: Vasilis Liaskovitis <vasilis.liaskovi...@profitbricks.com>
---
hw/virtio-balloon.c | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
diff --git a/hw/virtio-balloon.c b/hw/virtio-balloon.c
index dd1a650..149e8ba 100644
--- a/hw/virtio-balloon.c
+++ b/hw/virtio-balloon.c
@@ -22,6 +22,7 @@
#include "virtio-balloon.h"
#include "kvm.h"
#include "exec-memory.h"
+#include "dimm.h"
#if defined(__linux__)
#include <sys/mman.h>
@@ -147,10 +148,11 @@ static void virtio_balloon_set_config(VirtIODevice *vdev,
VirtIOBalloon *dev = to_virtio_balloon(vdev);
struct virtio_balloon_config config;
uint32_t oldactual = dev->actual;
+ uint64_t hotplugged_ram_size = get_hp_memory_total();
memcpy(&config, config_data, 8);
dev->actual = le32_to_cpu(config.actual);
if (dev->actual != oldactual) {
- qemu_balloon_changed(ram_size -
+ qemu_balloon_changed(ram_size + hotplugged_ram_size -
(dev->actual << VIRTIO_BALLOON_PFN_SHIFT));
}
}
@@ -188,17 +190,20 @@ static void virtio_balloon_stat(void *opaque, BalloonInfo
*info)
info->actual = ram_size - ((uint64_t) dev->actual <<
VIRTIO_BALLOON_PFN_SHIFT);
+ info->actual += get_hp_memory_total();
}
static void virtio_balloon_to_target(void *opaque, ram_addr_t target)
{
VirtIOBalloon *dev = opaque;
+ uint64_t hotplugged_ram_size = get_hp_memory_total();
- if (target > ram_size) {
- target = ram_size;
+ if (target > ram_size + hotplugged_ram_size) {
+ target = ram_size + hotplugged_ram_size;
}
if (target) {
- dev->num_pages = (ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT;
+ dev->num_pages = (ram_size + hotplugged_ram_size - target) >>
+ VIRTIO_BALLOON_PFN_SHIFT;
virtio_notify_config(&dev->vdev);
}
}
--
1.7.9
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