When do memory balloon, it references the ram_size as the real ram size of VM,
But here ram_size is not include the hotplugged memory, and the result will
be confused.
Steps to reproduce:
(1)Start VM: qemu -m size=1024,slots=4,maxmem=8G
(2)In VM: #free -m : 1024M
(3)qmp balloon 512M
(4)In VM: #free -m : 512M
(5)hotplug pc-dimm 1G
(6)In VM: #free -m : 1512M
(7)qmp balloon 256M
(8)In VM: #free -m :1256M
Here we add a new global variable 'vm_ram_size', it will stat
the VM's real ram size which include configured ram and hotplugged ram.
virtio-balloon will reference this parameter.
Signed-off-by: zhanghailiang <zhang.zhanghaili...@huawei.com>
---
hw/i386/pc.c | 1 +
hw/virtio/virtio-balloon.c | 10 +++++-----
include/exec/cpu-common.h | 1 +
vl.c | 3 +++
4 files changed, 10 insertions(+), 5 deletions(-)
diff --git a/hw/i386/pc.c b/hw/i386/pc.c
index b6c9b61..817810b 100644
--- a/hw/i386/pc.c
+++ b/hw/i386/pc.c
@@ -1606,6 +1606,7 @@ static void pc_dimm_plug(HotplugHandler *hotplug_dev,
memory_region_add_subregion(&pcms->hotplug_memory,
addr - pcms->hotplug_memory_base, mr);
vmstate_register_ram(mr, dev);
+ vm_ram_size += memory_region_size(mr);
hhc = HOTPLUG_HANDLER_GET_CLASS(pcms->acpi_dev);
hhc->plug(HOTPLUG_HANDLER(pcms->acpi_dev), dev, &local_err);
diff --git a/hw/virtio/virtio-balloon.c b/hw/virtio/virtio-balloon.c
index 2c30b3d..205e1fe 100644
--- a/hw/virtio/virtio-balloon.c
+++ b/hw/virtio/virtio-balloon.c
@@ -292,7 +292,7 @@ static void virtio_balloon_set_config(VirtIODevice *vdev,
memcpy(&config, config_data, sizeof(struct virtio_balloon_config));
dev->actual = le32_to_cpu(config.actual);
if (dev->actual != oldactual) {
- qapi_event_send_balloon_change(ram_size -
+ qapi_event_send_balloon_change(vm_ram_size -
((ram_addr_t) dev->actual << VIRTIO_BALLOON_PFN_SHIFT),
&error_abort);
}
@@ -307,7 +307,7 @@ static uint32_t virtio_balloon_get_features(VirtIODevice
*vdev, uint32_t f)
static void virtio_balloon_stat(void *opaque, BalloonInfo *info)
{
VirtIOBalloon *dev = opaque;
- info->actual = ram_size - ((uint64_t) dev->actual <<
+ info->actual = vm_ram_size - ((uint64_t) dev->actual <<
VIRTIO_BALLOON_PFN_SHIFT);
}
@@ -316,11 +316,11 @@ 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 > vm_ram_size) {
+ target = vm_ram_size;
}
if (target) {
- dev->num_pages = (ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT;
+ dev->num_pages = (vm_ram_size - target) >> VIRTIO_BALLOON_PFN_SHIFT;
virtio_notify_config(vdev);
}
}
diff --git a/include/exec/cpu-common.h b/include/exec/cpu-common.h
index e3ec4c8..f55db6a 100644
--- a/include/exec/cpu-common.h
+++ b/include/exec/cpu-common.h
@@ -46,6 +46,7 @@ typedef uintptr_t ram_addr_t;
#endif
extern ram_addr_t ram_size;
+extern ram_addr_t vm_ram_size;
/* memory API */
diff --git a/vl.c b/vl.c
index 9c9acf5..5d20d0c 100644
--- a/vl.c
+++ b/vl.c
@@ -132,6 +132,7 @@ DisplayType display_type = DT_DEFAULT;
static int display_remote;
const char* keyboard_layout = NULL;
ram_addr_t ram_size;
+ram_addr_t vm_ram_size; /* ram_size + hotplugged ram size */
const char *mem_path = NULL;
int mem_prealloc = 0; /* force preallocation of physical target memory */
int nb_nics;
@@ -3015,6 +3016,7 @@ int main(int argc, char **argv, char **envp)
machine_class = find_default_machine();
cpu_model = NULL;
ram_size = default_ram_size;
+ vm_ram_size = ram_size;
snapshot = 0;
cyls = heads = secs = 0;
translation = BIOS_ATA_TRANSLATION_AUTO;
@@ -3388,6 +3390,7 @@ int main(int argc, char **argv, char **envp)
"'%s' option\n", slots_str ? "maxmem" : "slots");
exit(EXIT_FAILURE);
}
+ vm_ram_size = ram_size;
break;
}
#ifdef CONFIG_TPM
--
1.7.12.4
