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Description of problem:
The balloon service does not correctly handle the case where the driver is not present or is disabled when the service starts. The start command succeeds, but stats won't start coming after the driver is enabled.

Version-Release number of selected component (if applicable):
virtio-win-1.9.0-3.el7

How reproducible:
100%

Steps to Reproduce:
1. blnsvr.exe -s
2. disable VirtIO Balloon Driver
3. blnsvr.exe -r
4. enable VirtIO Balloon Driver

Actual results:
Stats are not coming.

Expected results:
Stats start coming as soon as the driver is enabled.

Additional info:

Reproduce this issue with virtio-win-1.9.0-3.el7;
Verify this issue with virtio-win-prewhql-0.1-131;

Steps same as comment#0.

with virtio-win-1.9.0-3.el7, balloon stats does NOT return values after step4:
{"return": {"stats": {"stat-swap-out": -1, "stat-available-memory": -1, "stat-free-memory": -1, "stat-minor-faults": -1, "stat-major-faults": -1, "stat-total-memory": -1, "stat-swap-in": -1}, "last-update": 1486098878}};

with virtio-win-prewhql-0.1-131,balloon stats comes back after step4:
{"return": {"stats": {"stat-swap-out": 45428736, "stat-available-memory": -1, "stat-free-memory": 2094915584, "stat-minor-faults": 12228586, "stat-major-faults": 115429, "stat-total-memory": 3220688896, "stat-swap-in": 2984939520}, "last-update": 1486098842}}

So this issue has been fixed,thanks.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2017:2341