Understanding Xen event channel bit operation

Understanding Xen event channel bit operation

[amin.fallahi]

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Hi everybody
I need to understand when these pending and mask bits are set and cleared.
It seems pending bits are set by evtchn_set_pending method in
event_channel.c but I don't understand where pending bit is cleared by the
guest and where mask bit is set and reset?
Can anybody help me with understanding this?
Thanks all

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Re: Understanding Xen event channel bit operation

[David Vrabel]

On 25/10/15 09:25, amin.fallahi@gmail.com wrote:
> Hi everybody
> I need to understand when these pending and mask bits are set and
> cleared. It seems pending bits are set by evtchn_set_pending method in
> event_channel.c but I don't understand where pending bit is cleared by
> the guest and where mask bit is set and reset?

The mask and pending bits are in memory shared with the guest and the
guest (mostly) modifies these bits by writing directly to the shared memory.

You need to look at the guest kernel (e.g.,
drivers/xen/events/events_base.c in Linux).

David