> -----Original Message----- > From: Avi Kivity [mailto:a...@redhat.com] > Sent: Sunday, August 12, 2012 4:52 PM > To: Ren, Yongjie > Cc: kvm@vger.kernel.org; Marcelo Tosatti > Subject: Re: Will KVM support "Xen on KVM" type in nested virtualization ? > > On 08/11/2012 12:20 PM, Ren, Yongjie wrote: > > 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 ? > > Those are two bugs in kvm. The first is trivial to fix, the second is > harder. I will take a look. > That'll be great. Thank you. Will these two be fixed in kernel side or qemu side? Maybe I can file a bug to track it later.
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