From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Vrabel <david.vrabel@citrix.com>
Subject: Re: Understanding Xen event channel bit operation
Date: Mon, 26 Oct 2015 10:50:29 +0000
Message-ID: <562E0575.2020802@citrix.com>
References: <CAF-KA8-gHai2A1Mzxpd_vnSHqmzWV11qYKsCa9Kxc=kGRwsqbw@mail.gmail.com>
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To: "amin.fallahi@gmail.com" <amin.fallahi@gmail.com>, xen-devel@lists.xen.org
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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