From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 191701] New: AMD-Vi completion-wait loop time outs freeze
 system
Date: Mon, 02 Jan 2017 07:13:22 +0000
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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: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: twtduck.ii@gmail.com
        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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