Re: [Xen-devel] Does Xen support nested VM migration

["Han, Huaitong" <huaitong.han@xxxxxxxxx>]

On Wed, 2015-07-01 at 08:50 +0100, Andrew Cooper wrote:
> On 01/07/2015 03:49, Han, Huaitong wrote:
> > Hi, all,
> >  
> > When I create a L1 guest with nestedhvm=1, and create a L2 guest in L1
> > guest, then migrate L1 guest, but the operation fails, and I find the
> > bugfix requires a lot of work.
> 
> Fails in what way?
The xen hypervisor in L1 guest has execute "vmxon" and
nvmx->vmxon_region_pa get the value, after L1 migration, vmxon impact is
lost and nvmx->vmxon_region_pa==0 , when L2 guest has some operation
like VMREAD or VMWRITE,  vmx_inst_check_privilege will return 1, and L1
guest maybe hang or panic.

> 
> > Does Xen support the operation? I guess the nestedvm migration feature
> > is not at all implemented.
> 
> Nested virtualisation is still experimental, and there are areas with
> known issues, and scenarios which I expect have never been tried.
> 
> Having said that, there is nothing I am of with migration which I would
> expect to break or need further fixing in a nested scenario.
> 
> ~Andrew
> 
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