[Bug 58941] New: [nested virt] L2 has NMI error when creating L1 with "-cpu host" parameter.

[Bug 58941] New: [nested virt] L2 has NMI error when creating L1 with "-cpu host" parameter.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58941

           Summary: [nested virt] L2 has NMI error when creating L1 with
                    "-cpu host" parameter.
           Product: Virtualization
           Version: unspecified
    Kernel Version: 3.10.0-rc1
          Platform: All
        OS/Version: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: kvm
        AssignedTo: virtualization_kvm@kernel-bugs.osdl.org
        ReportedBy: yongjie.ren@intel.com
        Regression: Yes


Environment:
------------
Host OS (ia32/ia32e/IA64):ia32e
Guest OS (ia32/ia32e/IA64):ia32e
Guest OS Type (Linux/Windows):Linux
kvm.git next Commit:e47a5f5fb715b90b40747e9e235de557c6abd56c
qemu-kvm Commit:b5803aa3583e82e5133f7621121bc15ee694f4a1
Host Kernel Version:3.10.0-rc1
Hardware: SandyBridge-EP, Haswell


Bug detailed description:
--------------------------
When starting L1 guest with parameter "-cpu host" (or '-cpu SandyBridge,+vmx',
'-cpu Haswell,+vmx'), the L2 guest will print error like "NMI
received for unknown reason 00 on CPU 1."

note:
When starting L1 guest with parameter "-cpu qemu64,+vmx", L2 guest won't print
NMI error.

Reproduce steps:
----------------
1. create L1 guest:
qemu-system-x86_64 --enable-kvm -m 10240 -smp 8 -net
nic,macaddr=00:12:45:67:2B:1C -net tap,script=/etc/kvm/qemu-ifup
nested-kvm-rhel6u4.qcow -cpu host
2. create L2 guest
qemu-system-x86_64 --enable-kvm -m 1024 -smp 2 -net none rhel6u4.img


Current result:
----------------
L2 guest continuously print NMI message

Expected result:
----------------
L2 guest has no NMI message print； L2 works fine

Basic root-causing log:
----------------------
[ in L2's 'dmesg']
Uhhuh. NMI received for unknown reason 30 on CPU 0.
Do you have a strange power saving mode enabled?
Dazed and confused, but trying to continue

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[Bug 58941] [nested virt] L2 has NMI error when creating L1 with "-cpu host" parameter.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58941





--- Comment #1 from Jay Ren <yongjie.ren@intel.com>  2013-05-29 06:14:54 ---
kvm next + qemu-kvm   = result
188424ba + b5803aa3   = good
db6ae615 + b5803aa3   = bad

This bug may have some relationship with bug #58921.

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[Bug 58941] [nested virt] L2 has NMI error when creating L1 with "-cpu host" parameter.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58941

Zhou, Chao <chao.zhou@intel.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |chao.zhou@intel.com

--- Comment #2 from Zhou, Chao <chao.zhou@intel.com> ---
this commit fix the bug:
commit cd2633c59b6f511effb53e10fa2c1e20b1cec1e7
Author: Jan Kiszka <jan.kiszka@siemens.com>
Date:   Wed Oct 23 17:42:15 2013 +0100

    nVMX: Fix pick-up of uninjected NMIs

    __vmx_complete_interrupts stored uninjected NMIs in arch.nmi_injected,
    not arch.nmi_pending. So we actually need to check the former field in
    vmcs12_save_pending_event. This fixes the eventinj unit test when run
    in nested KVM.

    Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
    Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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[Bug 58941] [nested virt] L2 has NMI error when creating L1 with "-cpu host" parameter.

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=58941

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |alan@lxorguk.ukuu.org.uk
         Resolution|---                         |CODE_FIX

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[Bug 58941] [nested virt] L2 has NMI error when creating L1 with "-cpu host" parameter.

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https://bugzilla.kernel.org/show_bug.cgi?id=58941

Alan <alan@lxorguk.ukuu.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |CLOSED

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