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Revision bd12ff9d

IDbd12ff9df78b0d04059a35c4a9d0a9337eb4999e

Added by Adam Litke about 12 years ago

balloon: Fix overflow when reporting actual memory size

Beginning with its introduction, the virtio balloon has had an overflow error
that causes 'info balloon' to misreport the actual memory size when the balloon
itself becomes larger than 4G. Use a cast when converting dev->actual from
pages to kB to prevent overflows.

Before:
(qemu) info balloon
balloon: actual=5120
(qemu) balloon 1025
(qemu) info balloon
balloon: actual=1025
(qemu) balloon 1024
(qemu) info balloon
balloon: actual=5120

After:
(qemu) info balloon
balloon: actual=5120
(qemu) balloon 1025
(qemu) info balloon
balloon: actual=1025
(qemu) balloon 1024
(qemu) info balloon
balloon: actual=1024

Signed-off-by: Adam Litke <>
Signed-off-by: Aurelien Jarno <>

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