[Bug 190211] New: memory ballooning doesn't take on boot since approx kernel 4.5.3

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https://bugzilla.kernel.org/show_bug.cgi?id=190211

            Bug ID: 190211
           Summary: memory ballooning doesn't take on boot since approx
                    kernel 4.5.3
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.9, 4.8.14, 4.8.1, 4.7.2, 4.6.2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: ap@zip.com.au
        Regression: No

Just noticed that on restart or bootup memory ballooning stopped working. The
guest boots with the maximum allowed memory rather than the "current" setting
in libvirt.

If I request a memory shrink after boot, the balloon works and memory available
shrinks as requested.

I went through the following guest kernels: 4.9, 4.8.14, 4.8.1, 4.7.2, 4.6.2,
4.5.3 (worked), 4.4.4 (worked). These were custom compiles. Debian official
kernels for 4.8.0 and 4.7.0 also failed.

I used libvirt 2.5.0, 2.4.0 and 1.2.20

Qemu versions: 2.5 and 2.7

Debian stretch for the guest, wheezy and stretch for the host.

Host kernels 4.3.3, 4.8.6 and 4.8.14

The fact that dropping kernel versions made it work once I hit 4.5.3 makes me
think there's an issue kernel-side.

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