Re: live migration between kernel/user irqchip

[Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@public.gmane.org>]

Dong, Eddie wrote:
> When thinking about live migration support for in kernel irqchip, one
> question comes out which need to be solved first:
> Do we need to support live migration among user level irqchip and kernel
> level? 

Yes.

> If the answer is yes, kernel level irqchip must keep same state
> with user level, i.e. if Qemu changes the pic/apic/ioapic state
> definition, we need to do corresponding changes too, otherwise kernel
> side can stay as it is.
>   

The qemu state mimics the device state and should be independent of 
implementation details.  If the qemu state is added too, this most 
likely indicates a but that needs to be fixed in kvm as well.

The best way to do live migration is to copy the kernel state into the 
qemu device model, and let qemu do state serialization.  This ensures 
compatibility.

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


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