Xen devel - Dec 2004 - how xen inject a virtual irq to a domain when a msg is available for this domain?

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?

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. :(

Thanks in advance for kind helps.

Xin


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> 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
> 
> 
> -------------------------------------------------------
> SF email is sponsored by - The IT Product Guide
> Read honest & candid reviews on hundreds of IT Products from real
users.
> Discover which products truly live up to the hype. Start reading now. 
> http://productguide.itmanagersjournal.com/
> _______________________________________________
> Xen-devel mailing list
> Xen-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/xen-devel


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