Add virtio-balloon support

This adds a VirtIO based balloon driver.  It uses madvise() to actually balloon
the memory when possible.

Until 2.6.27, KVM forced memory pinning so we must disable ballooning unless the
kernel actually supports it when using KVM.  It's always safe when using TCG.

Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5874 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 5 insertions, 0 deletions

diff --git a/hw/pc.c b/hw/pc.c
index 25dedc8999..20827f2d66 100644
--- a/hw/pc.c
+++ b/hw/pc.c
@@ -34,6 +34,7 @@
 #include "console.h"
 #include "fw_cfg.h"
 #include "virtio-blk.h"
+#include "virtio-balloon.h"
 
 /* output Bochs bios info messages */
 //#define DEBUG_BIOS
@@ -1105,6 +1106,10 @@ static void pc_init1(ram_addr_t ram_size, int vga_ram_size,
             unit_id++;
         }
     }
+
+    /* Add virtio balloon device */
+    if (pci_enabled)
+        virtio_balloon_init(pci_bus);
 }
 
 static void pc_init_pci(ram_addr_t ram_size, int vga_ram_size,