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Drivers: hv: Add Hyper-V balloon driver

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Add the basic balloon driver. Windows hosts dynamically manage the guest
memory allocation via a combination memory hot add and ballooning. Memory
hot add is used to grow the guest memory upto the maximum memory that can be
allocatted to the guest. Ballooning is used to both shrink as well as expand
up to the max memory. Supporting hot add needs additional support from the
host. We will support hot add when this support is available. For now,
by setting the VM startup memory to the VM  max memory, we can use
ballooning alone to dynamically manage memory allocation amongst
competing guests on a given host.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
K. Y. Srinivasan 2012-11-14 01:09:02 -08:00 committed by Greg Kroah-Hartman
parent 997071bcb3
commit 9aa8b50b2b
3 changed files with 1048 additions and 0 deletions
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6
drivers/hv/Kconfig
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@ -13,4 +13,10 @@ config HYPERV_UTILS
help
Select this option to enable the Hyper-V Utilities.
config HYPERV_BALLOON
tristate "Microsoft Hyper-V Balloon driver"
depends on HYPERV
help
Select this option to enable Hyper-V Balloon driver.
endmenu

1
drivers/hv/Makefile
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@ -1,5 +1,6 @@
obj-$(CONFIG_HYPERV) += hv_vmbus.o
obj-$(CONFIG_HYPERV_UTILS) += hv_utils.o
obj-$(CONFIG_HYPERV_BALLOON) += hv_balloon.o
hv_vmbus-y := vmbus_drv.o \
hv.o connection.o channel.o \

1041
drivers/hv/hv_balloon.c Normal file
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