Re: [Qemu-devel] [PATCH] pc: Clean up PIC-to-APIC IRQ path

[Edgar E. Iglesias]

On Mon, Sep 05, 2011 at 12:28:50PM +0300, Avi Kivity wrote:

... 
> Query is needed when a line is masked internally, or when a device is 
> hot-plugged.
> 
> We can work around masking by caching the level in the device even 
> though the line is masked, and querying the cache when the line is 
> unmasked, but that is artificial, and requires live-migrating the cache 
> (which isn't true state).  We can't work around the hotplug case.

Yup, hotplug messes everything up :) At least if you want to plug into
arbitrary places in the tree.

Cheers