[Xen-devel] Frontend/Backend model

["David Shwatrz" <dshwatrz@xxxxxxxxx>]

Hello,
A question about frontend/backend model:

I had looked in the code of netfront (and blockfront) and I wonder 
: do these modules operate in soft_irq or interrupt context? 
For exmaple, methods like network_start_xmit() (for trasmitting frames 
in nerfront ) or network_tx_buf_gc() (for receiving frames in netfront) ?
I see that the netif_int() calls network_tx_buf_gc(). But is domU
network_tx_buf_gc() method called from a regular interrupt context 
(like in the ususal case, when we deal with ordinary 
drivers) ? Am I permitted to call a method that may sleep in these
methods ? As I understood, interrrupt handling in Xen is different, because interrupts are 
handled by domain 0, and as I understood there are events channels and pending
events, and the interrupts are in fact handled first by domain 0, which activates
some event channel messages.
I want to verify this point for better understanding the frontend/backend model.

Regards,
D Shwatrz


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