On Tue, Aug 27, 2013 at 2:48 PM, Jan Kiszka <jan.kiszka@xxxxxxxxxxx> wrote: > On 2013-08-27 10:29, 缪天翔 wrote: >> Hi all >> >> I am doing a research project similar to "Turtles" using the nested >> vmx feature of kvm. In detail, I launch a guest kvm (donated as L1) on >> the underlying kvm (donated as L0) and then set up a nested guest >> (donated as L2) upon the L1 guest kvm. >> >> The problem I come up with is that I want to migrate the whole L1 >> guest kvm from source machine to target (that is keeping the L2 guest >> running normally). And this action causes the L2 kernl to panic. >> >> Can anybody tell me whether kvm supports this kind of nested migration >> or anybody is working on the relating field? > > No, KVM does not support migration while nested VMX (or SVM) is enabled. > We lack userspace interfaces to export/import the required state, and > that mostly because we do not really know yet what state needs to be > made available. Good to know, you saved some time :-). I was about to try to test if it works or not. > Specifically nVMX is still under development. Migration > support will officially follow once we feel we reached a mature state > with nesting support. > > That said, if you want to play with adding such an interface yourself, > no one will stop you. It may serve as a reference for us what is > required, but you should not expect it to be merged soon. > > BTW, not only migration is broken so far. Even reset does not work while > VMX is enabled. For the same reason: userspace cannot load a VCPU state > that resets all VMX states properly. > > Jan > > -- > Siemens AG, Corporate Technology, CT RTC ITP SES-DE > Corporate Competence Center Embedded Linux > -- > To unsubscribe from this list: send the line "unsubscribe kvm" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
