[Qemu-devel] Re: [PATCH 0/8] kvm: Fixes, cleanups and live migration

[Avi Kivity]

Jan Kiszka wrote:
> As far as I understood it, interrupt_bitmap will become relevant for
> in-kernel irqchips.
>   

It's relevant for both.  tcg is able to ack an interrupt and inject it 
atomically,  but kvm is not (since injection is part of guest entry, 
which does not have bounded execution time).  Hence the need to split 
the ack and injection into two steps, and save intermediate state.



--
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.