New: AMD-Vi completion-wait loop time outs freeze system

https://bugzilla.kernel.org/show_bug.cgi?id=191701

            Bug ID: 191701
           Summary: AMD-Vi completion-wait loop time outs freeze system
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.8.15
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: [email protected]
          Reporter: [email protected]
        Regression: No

Created attachment 249591
--> https://bugzilla.kernel.org/attachment.cgi?id=249591&action=edit
The last few lines from the system log before I had to force reboot.

When I boot my 4.8.15 kernel, by the time my login screen shows, the system rapidly lags out and freezes in a couple seconds. In the system log (relevant subsection attached), this seems to be caused by AMD-Vi having time-outs. Perhaps part of the problem is that the hardware that I'm using (Acer e5-553g) has basically no virtualization support. I'd really like to upgrade my kernel to fix some minor issues with my graphics driver, but this seems to be holding me back and I don't know how to fix it. Since this wasn't a problem in 4.4.39, I figured it might be a good idea to file a bug report, so that other people with similar issues may have them resolved before trying to dig deep into the heart of the problem and/or giving up.

There seems to have been a similar bug back in 3.6.11, that was more widespread. After some searching, I haven't found this bug reported yet, so I figured I'd go ahead and blaze that trail.

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