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[Xen-devel] what the role platform-pci play in comunication between HVM

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] what the role platform-pci play in comunication between HVM and domain0
From: 胡少龙 <sunofblack@xxxxxxxx>
Date: Mon, 13 Sep 2010 22:49:24 +0800 (CST)
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Can someone interpret how HVM guest communicate with domain0, as i know, H VM 
can not use event channel directly, is the platform-pci offer a way to solve 

Please try to explain concretely, for example :

1.how does HVM send a event to domain0, how does domain0 catch this event, and 
assoicate it with a handler 

2.the opposite direction, how does domain0 send event to HVM guest? Does it do 
something through the platform-pci? what the platform-pci does first? Does it 
create a virtual pci device? Then does domain0 send event to this pci device to 
fire a interupt ? How does it do this? Finally, I just need to deal with this 

Something like that, i hope someone can give a detailed depiction that can make 
me draw a flow chart. Thanks. 

Hu shaolong

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