[Bug 121011] New: Whole system freezes randomly when booting with 'iommu=on' kernel parameter

[Bug 121011] New: Whole system freezes randomly when booting with 'iommu=on' kernel parameter

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=121011

            Bug ID: 121011
           Summary: Whole system freezes randomly when booting with
                    'iommu=on' kernel parameter
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.4.14-1-lts
          Hardware: Intel
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: daltonfury42@gmail.com
        Regression: No

Created attachment 221211
  --> https://bugzilla.kernel.org/attachment.cgi?id=221211&action=edit
output of dmesg

I am trying to run Windows 8.1 as a guest OS using KVM. It freezes probably
when the guest OS tries to use the GPU. Steps to reproduce:

1) Run Windows inside QEMU
2) Open Google Chrome, go to https://www.chromeexperiments.com/webgl and run a
experiment (so that GPU is used).

I got a stack trace in dmesg output which has been attached to this report.

Here is the lspci -vv output: https://paste.ubuntu.com/17917370/

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