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Re: [Xen-devel] event notify during netfront and netback setup in Xen3.1
| To: | "Zang Hongyong" <zanghongyong@xxxxxxxxxx> |
|---|---|
| Subject: | Re: [Xen-devel] event notify during netfront and netback setup in Xen3.1 |
| From: | "Grzegorz Miłoś" <gm281@xxxxxxxxx> |
| Date: | Thu, 19 Jun 2008 16:36:43 +0100 |
| Cc: | xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx> |
| Delivery-date: | Thu, 19 Jun 2008 08:37:05 -0700 |
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| Sender: | xen-devel-bounces@xxxxxxxxxxxxxxxxxxx |
> hi > In Xen3.1 source > when setup > netfront: when netback changed XenBusState to InitWait, fuction > network_connect() called > in network_connect(),notify_remote_via_irq() was called, which > gives netback a kick. > then netfront changed Xenbusstate to Connected > > but at the same time, netback has not bind its eventchannel to netfront > domain's event? > so how could this happen, when netback receive event from netfront domain? Netfront allocates an unbound event channel in responce to the backend entering InitWait state (network_connect() -> talk_to_backend() -> setup_device() -> bind_listening_port_to_irqhandler() -> bind_listening_port_to_irq() -> EVTCHNOP_alloc_unbound). Once the channel is allocated, the frontend can queue events on it, even before backend binds it. This happens later on, in responce to netfront entering Connected state (bind_interdomain_evtchn_to_irqhandler() in netif_map()). Hope this helps Gr(z)egor(z) _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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