This patch adds a ballooning infrastructure to QEMU. This includes a pair of
monitor commands, balloon and info balloon, to balloon a guest and to query
the guest's balloon status.
Signed-off-by: Anthony Liguori <[EMAIL PROTECTED]>
diff --git a/qemu/balloon.h b/qemu/balloon.h
new file mode 100644
index 0000000..60b4a5d
--- /dev/null
+++ b/qemu/balloon.h
@@ -0,0 +1,27 @@
+/*
+ * Balloon
+ *
+ * Copyright IBM, Corp. 2008
+ *
+ * Authors:
+ * Anthony Liguori <[EMAIL PROTECTED]>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2. See
+ * the COPYING file in the top-level directory.
+ *
+ */
+
+#ifndef _QEMU_BALLOON_H
+#define _QEMU_BALLOON_H
+
+#include "cpu-defs.h"
+
+typedef ram_addr_t (QEMUBalloonEvent)(void *opaque, ram_addr_t target);
+
+void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque);
+
+void qemu_balloon(ram_addr_t target);
+
+ram_addr_t qemu_balloon_status(void);
+
+#endif
diff --git a/qemu/monitor.c b/qemu/monitor.c
index 4acf346..2240d8e 100644
--- a/qemu/monitor.c
+++ b/qemu/monitor.c
@@ -35,6 +35,7 @@
#include "audio/audio.h"
#include "disas.h"
#include "migration.h"
+#include "balloon.h"
#include <dirent.h>
#include "qemu-timer.h"
@@ -1399,6 +1400,23 @@ static void do_inject_nmi(int cpu_index)
}
#endif
+static void do_balloon(int value)
+{
+ ram_addr_t target = value;
+ qemu_balloon(target << 20);
+}
+
+static void do_info_balloon(void)
+{
+ ram_addr_t actual;
+
+ actual = qemu_balloon_status();
+ if (actual == 0)
+ term_printf("Ballooning not activated in VM\n");
+ else
+ term_printf("balloon: actual=%d\n", (int)(actual >> 20));
+}
+
static term_cmd_t term_cmds[] = {
{ "help|?", "s?", do_help,
"[cmd]", "show the help" },
@@ -1494,6 +1512,8 @@ static term_cmd_t term_cmds[] = {
{ "pci_add", "iss", device_hot_add, "bus nic|storage
[[vlan=n][,macaddr=addr][,model=type]] [file=file][,if=type][,bus=nr]...",
"hot-add PCI device" },
{ "pci_del", "ii", device_hot_remove, "bus slot-number", "hot remove PCI
device" },
#endif
+ { "balloon", "i", do_balloon,
+ "target", "request VM to change it's memory allocation (in MB)" },
{ NULL, NULL, },
};
@@ -1558,6 +1578,8 @@ static term_cmd_t info_cmds[] = {
#endif
{ "migration", "", do_info_migration,
"", "show migration information" },
+ { "balloon", "", do_info_balloon,
+ "", "show balloon information" },
{ NULL, NULL, },
};
diff --git a/qemu/vl.c b/qemu/vl.c
index 2dc1311..ec89921 100644
--- a/qemu/vl.c
+++ b/qemu/vl.c
@@ -38,6 +38,7 @@
#include "block.h"
#include "audio/audio.h"
#include "migration.h"
+#include "balloon.h"
#include "qemu-kvm.h"
#include <unistd.h>
@@ -530,6 +531,31 @@ void hw_error(const char *fmt, ...)
va_end(ap);
abort();
}
+
+/***************/
+/* ballooning */
+
+static QEMUBalloonEvent *qemu_balloon_event;
+void *qemu_balloon_event_opaque;
+
+void qemu_add_balloon_handler(QEMUBalloonEvent *func, void *opaque)
+{
+ qemu_balloon_event = func;
+ qemu_balloon_event_opaque = opaque;
+}
+
+void qemu_balloon(ram_addr_t target)
+{
+ if (qemu_balloon_event)
+ qemu_balloon_event(qemu_balloon_event_opaque, target);
+}
+
+ram_addr_t qemu_balloon_status(void)
+{
+ if (qemu_balloon_event)
+ return qemu_balloon_event(qemu_balloon_event_opaque, 0);
+ return 0;
+}
/***********************************************************/
/* keyboard/mouse */
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to [EMAIL PROTECTED]
More majordomo info at http://vger.kernel.org/majordomo-info.html
