https://bugzilla.kernel.org/show_bug.cgi?id=58921
Summary: [nested virt] L2 Windows guest can't boot up ('-cpu
host' to start L1)
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): Windows
kvm.git next branch Commit:db6ae6158186a17
qemu-kvm Commit:b5803aa3583e82e513
Host Kernel Version:3.9.0-rc3
Hardware:SandyBridge-EP
Bug detailed description:
--------------------------
In 'kvm on kvm' nested virtualization environment,if I start L1 with '-cpu
host', a Windows (e.g. Win7) guest can't boot up as L2 guest.
note:
1. when creating a linux guest as L2 guest, L2 guest boot up fine
2. if starting L1 with '-cpu qemu64,+vmx', L2 Windows can boot up.
3. this should be a kvm kernel bug:
kvm next + qemu-kvm = result
db6ae615 + b5803aa3 = bad
188424ba + b5803aa3 = good
Reproduce steps:
----------------
1.create L1 guests:
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 guests:
qemu-system-x86_64 -enable-kvm -m 1024 -smp 2 -net none win7.img
Current result:
----------------
L2 guest (win7 guest) failed to boot up.
Expected result:
----------------
L2 guest (win7 guest) boot up fine
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