Re: [Xen-devel] Clock Interrupt not occurring. hypervisor_callback not being called. (more info)

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 1 Mar 2006, at 16:17, Ivan Kelly wrote:

> The problem seems to be that evtchn_pending[0] is not being updated
> fast enough after the callback is made. Therefore the callback is
> running and seeing nothing as pending and discarding anything that
> happens.
This is certainly not happening or I think it would have been 
discovered and fixed by now. :-)
When firing an event the pending flag gets set first, then the selector 
bit, then the evtchn_upcall_pending master flag, then the upcall 
happens.
When processing an upcall, you should clear bits in the opposite order.

 -- Keir


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