KVM Nested L2 guest startup problems

[Hu Yaohui]

Hi all,
I have a problem running the latest version of kvm with nested configuration.
I used to run it with kernel 3.2.2 both for L0 and L1, which works perfectly.
When I change my L0 to kernel 3.10.36, L1 to kernel 3.12.10.
When I start L2 guest in L1 with qemu-kvm. I get the following error
from the qemu-kvm.
<log>
KVM: entry failed, hardware error 0x0
EAX=00000000 EBX=00000000 ECX=00000000 EDX=00000623
ESI=00000000 EDI=00000000 EBP=00000000 ESP=00000000
EIP=0000e05b EFL=00000002 [-------] CPL=0 II=0 A20=1 SMM=0 HLT=0
ES =0000 00000000 0000ffff 00009300
CS =f000 000f0000 0000ffff 00009b00
SS =0000 00000000 0000ffff 00009300
DS =0000 00000000 0000ffff 00009300
FS =0000 00000000 0000ffff 00009300
GS =0000 00000000 0000ffff 00009300
LDT=0000 00000000 0000ffff 00008200
TR =0000 00000000 0000ffff 00008b00
GDT=     00000000 0000ffff
IDT=     00000000 0000ffff
CR0=60000010 CR2=00000000 CR3=00000000 CR4=00000000
DR0=0000000000000000 DR1=0000000000000000 DR2=0000000000000000
DR3=0000000000000000
DR6=00000000ffff0ff0 DR7=0000000000000400
EFER=0000000000000000
Code=00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 <2e>
66 83 3e 24 d3 00 0f 85 e2 e5 31 c0 8e d0 66 bc 00 70 00 00 66 ba 4c
28 0f 00 e9 07 e5
</log>

In L0, the kernel gives me error like:
<log>
[310681.735709] nested_vmx_exit_handled failed vm entry 7
</log>

I am wondering anyone has met the similar problem.

Best Wishes,
Yaohui
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