From mboxrd@z Thu Jan  1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 105841] New: "KVM: x86: apply guest MTRR virtualization on host
 reserved pages" causes kernel to panic on boot
Date: Mon, 12 Oct 2015 15:35:41 +0000
Message-ID: <bug-105841-28872@https.bugzilla.kernel.org/>
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https://bugzilla.kernel.org/show_bug.cgi?id=105841

            Bug ID: 105841
           Summary: "KVM: x86: apply guest MTRR virtualization on host
                    reserved pages" causes kernel to panic on boot
           Product: Virtualization
           Version: unspecified
    Kernel Version: 4.2.0
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
          Assignee: virtualization_kvm@kernel-bugs.osdl.org
          Reporter: vapier@gentoo.org
        Regression: Yes

Created attachment 190041
  --> https://bugzilla.kernel.org/attachment.cgi?id=190041&action=edit
kernel config

after upgrading to linux-4.2, i found my system no longer booted -- it paniced
pretty early on.  after bisecting it down, it started with:
commit fd717f11015f673487ffc826e59b2bad69d20fe5
KVM: x86: apply guest MTRR virtualization on host reserved pages

going back to the linux-4.2 release, if i revert these commits, things boot:
fd717f11015f673487ffc826e59b2bad69d20fe5
e098223b789b4a618dacd79e5e0dad4a9d5018d1
3c2e7f7de3240216042b61073803b61b9b3cfb22
i needed all three because the other two started using code from the first bad
commit.

i'm using a AMD Phenom(tm) II X4 980 Processor.  having trouble getting a panic
log (no serial port).  will try to manually offload it.

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