Hi folks,
I did some basic testing on nested virtualization on Intel x86-64 platform.
Will KVM support Xen as L1 guest in nested virtualization ?
When I tried "Xen on KVM" mode, I found VMX can't be initialized in L1 Xen hypervisor.
I tried both "-cpu host" and "-cpu qemu64,+vmx" parameters in qemu-kvm command line.
-------some log in 'xl dmesg' command line in L1 Xen ---
(XEN) VMX: CPU0 has insufficent CPU-Based Exec Control (b299868c but requires min 2299968c)
(XEN) VMX: CPU0 has insufficent VMExit Control (00000200 but requires min 00008200)
(XEN) VMX: failed to initialise.
------more details in the attached "xl-dmesg-L1.log"----
In Xen source code, I found the following related to the mentioned error.
"xen-unstable.hg/xen/include/asm-x86/hvm/vmx/vmcs.h"
#define CPU_BASED_RDTSC_EXITING 0x00001000
#define VM_EXIT_ACK_INTR_ON_EXIT 0x00008000
Will KVM expose these two features in its vCPU ?
Best Regards,
Yongjie (Jay)
Attachment:
xl-dmesg-L1.log
Description: xl-dmesg-L1.log
