[Xen-devel] nested virtualizaiton test report for Xen 4.3-RC1

["Ren, Yongjie" <yongjie.ren@xxxxxxxxx>]

Hi All,
This the a nested virtualization test report for Xen 4.3-RC1 on Intel hardware. 
We use Linux 3.9.1 as Dom0.
a. Virtual EPT and VMCS shadowing features can work fine.
b. Xen, KVM and VMware can basically work on top of L0 Xen.
c. 32bit/64bit Linux and Windows are covered as L2 guests.

There are three basic entities in Xen nested virtualization.
        L0: Xen (64bit Xen and 64bit Dom0), which is at the bottom of the 
nested stack.
        L1: Xen or KVM or VMware or VirtualBox  (all in 64bit mode)
        L2: Linux or Windows guest, which is at the top of the nested stack.
(when saying 'KVM on Xen', I mean L0 hypervisor is Xen and L1 hypervisor is 
KVM.)

Workable cases: (Pass)
1. virtual EPT and VMCS shadowing feature enabled
2. 64bit Linux/Windows as L2 guest for "Xen on Xen"
3. 64bit Linux guest as L2 guest for "KVM on Xen"
4. L1 KVM and L1 Xen simultaneously running on a L0 Xen
5. L2 guest Save/Restore and local migration for "KVM on Xen"
6. AVX and XSAVE in L2 guest for "KVM on Xen"
7. some workloads (e.g. LTP, Kernel-build, UnixBench) can work fine in 64bit L2 
Linux guest
8. 64bit Linux L2 guest can boot up for "VMware on Xen"
9. 32bit L2 guest (Linux/Windows) booting on "Xen on Xen"  (not use EPT in L1)
10. 32bit/64bit Windows and 32bit Linux L2 guest booting on "VMware on Xen"  
(not use EPT in L1)
N.B. Only if you don't use EPT feature in L1 hypervisor, case #9 and #10 can 
work fine.

Non-workable cases: (Fail)
1. 32bit/64bit Windows L2 guest booting on "KVM on Xen"
2. L2 guest Save/Restore and local migration for "Xen on Xen"
3. Migration "from L0 to L1" for "Xen on Xen"
4. Migration "from L1 to L0" for "Xen on Xen"
5. Migration a L1 Xen/KVM guest with a L2 running in that L1
6. L2 guest booting on "VirtualBox on Xen"


Best Regards,
     Yongjie (Jay)



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