Re: [Qemu-discuss] Live migration of VM

[Jakob Bohm]

On 5/23/2014 8:19 AM, Prashant Upadhyaya wrote:
> Hi,
>
> Is it possible to  live migrate a VM (emulating AMD) running on native
> AMD to a machine running native ARM and back with QEMU ?

I believe a clarification is needed here.

What is it you want to do:

  A) Migrate the VM from qemu-system-x86_64 software emulating an
    AMD64 guest on an AMD64 host to qemu-system-x86_64 software
    emulating the same AMD64 guest on an ARM host.

  B) Migrate the VM from qemu-system-x86_64 KVM emulating an
    AMD64 guest on an AMD64 host to qemu-system-x86_64 software
    emulating the same AMD64 guest on an ARM host

  C) Migrate the VM from qemu-system-x86_64 emulating an
    AMD64 guest on an AMD64 host to qemu-system-arm emulating
    an ARM guest on an ARM host.

C) Is mostly impossible, because the Guest memory needs to contain
  completely different code when the virtual machine suddenly
  swaps its (virtual) CPU from AMD64 to ARM.

A) Might be possible, unless there is some oddity in the qemu code
  which transmits the virtual machine state differently depending
  on the Host architecture.

B) Might be more difficult, if the qemu code transmits KVM virtual
  machine state differently from equivalent software emulated
  virtual machine state.



Enjoy

Jakob
--
Jakob Bohm, CIO, Partner, WiseMo A/S.  http://www.wisemo.com
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