https://bugzilla.kernel.org/show_bug.cgi?id=107561

            Bug ID: 107561
           Summary: 4.2 breaks PCI passthrough in QEMU/KVM
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.2
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_...@kernel-bugs.osdl.org
          Reporter: fhor...@gmail.com
        Regression: No

QEMU/KVM VM's using PCI pass-through are taking a long time to boot, or never
booting. The issue is only present when the VM has more then ~2.5G of ram. I
was able to get a VM with 6G to boot, but I had to let it run overnight.

More info can be found in this thread:
https://bbs.archlinux.org/viewtopic.php?id=203240

Someone in the forum seems to have narrowed it down to a a set of commits
regarding kvm and mtrr in 4.1-rc2 that are in the mainline kernel as of 4.2.

Specifically commit fa61213746a706dd975661151c35795ca4dd82c2 KVM: MTRR:
simplify kvm_mtrr_get_guest_memory_type.

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