Re: [Qemu-devel] Asynchronous / synchronous IO emulation

[Dong, Eddie]

> > The usage is to construct a secondary hot standby VM (SVM), identical with
> the primary VM (PVM).
> > When an virtual DMA happens in PVM side, we need to know at which
> instruction boundary the virtual DMA is delivered, so that we can replay the
> virtual DMA event at the 2nd VM side, to keep them identical at any time.
> >
> > Asynchronous IO emulations seems to be a little bit more complicate to be
> deterministic...
> > I might be wrong.
> 
> There is a record-replay mode that might be worth investigating.  See
> docs/replay.txt.
> 
> It sounds like you are not using live migration for micro-checkpoints?
> The live migration mechanism would keep memory in sync at each
> checkpoint.
> 
> Is this work releated to the COLO effort?
> 
> Stefan

Thanks Stefan.  COLO is one what we push for high availability.
This is yet another project leveraging KVM for deterministic execution, which 
is still in room. I use VM replicating to explain the concept, but it is not 
used for high availability. 
Eddie