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New: "KVM: x86: apply guest MTRR virtualization on host reserved pages" causes kernel to panic on boot

Bug 105841 [email protected] 1 participant 4 messages Oct 12, 2015 – Oct 13, 2015 KVM

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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: [email protected]
          Reporter: [email protected]
        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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#2 lore raw

[Bug 105841] "KVM: x86: apply guest MTRR virtualization on host reserved pages" causes kernel to panic on boot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=105841

--- Comment #2 from Mike Frysinger <[email protected]> --- Created attachment 190061
--> https://bugzilla.kernel.org/attachment.cgi?id=190061&action=edit
dmidecode output

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#3 lore raw

[Bug 105841] "KVM: x86: apply guest MTRR virtualization on host reserved pages" causes kernel to panic on boot

In reply to [email protected]

https://bugzilla.kernel.org/show_bug.cgi?id=105841

Paolo Bonzini <[email protected]> changed:

What |Removed |Added
----------------------------------------------------------------------------

             Status|NEW                         |RESOLVED
                 CC|                            |[email protected]
         Resolution|---                         |CODE_FIX

--- Comment #3 from Paolo Bonzini <[email protected]> ---
The three have been reverted already (and commit 549283037017, "KVM: svm:
handle KVM_X86_QUIRK_CD_NW_CLEARED in svm_get_mt_mask", has been reverted as well) and the reverts are marked for stable.

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