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: [email protected]
ReportedBy: [email protected]
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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