Re: [Xen-devel] how xen inject a virtual irq to a domain when a msg is available for this domain?

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

> Hi,
> 
> Can somebody explain how xen insert a virtual irq to a domU/dom0?  I am
> looking at the codes of block driver and do see that a frontend block
> driver request a irq and bind it to a event channel. The driver can then
> define the interrupt handler for this irq. But I don't know where I can
> find the code of xen injecting irq. Can someone help me out?

Linux turns event-channel notifications into IRQs in
arch/xen/kernel/evtchn.c. 

> Another question, in xu.c, function map_control_interface return
> (control_if_t *)(vaddr+2048), what that means? why 2048? I cannot find the
> related document. :(

It would be described in the interface manual, if we had a full
interface manual. :-) The control interface is always in the seconf
half of each shared_info page.

 -- Keir

> Thanks in advance for kind helps.
> 
> Xin
> 
> 
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