Re: Question on skip_emulated_instructions()

[Avi Kivity <avi@redhat.com>]

On 04/08/2010 10:30 AM, Yoshiaki Tamura wrote:
>
> To answer your question, it should be possible to implement.
> The down side is that after going into KVM to make the guest state to 
> consistent, we need to go back to qemu to actually transfer the guest, 
> and this bounce would introduce another overhead if I'm understanding 
> correctly.

Yes.  It should be around a microsecond or so, given you will issue I/O 
after this I don't think this will affect performance.

> And yes, all I need is some consistent state to resume VM from, which 
> must be able to continue I/O operations, like writing to disks and 
> sending ack over the network.  If I can guarantee this, sending the VM 
> state after completing output is acceptable.
>

I suggest you start with this.  If it turns out performance is severely 
impacted, we can revisit instruction completion.  If performance is 
satisfactory, then we'll be able to run Kemari with older kernels.

-- 
error compiling committee.c: too many arguments to function