[Xen-devel] Deferrable jobs & hypercalls

To:	xen-devel@xxxxxxxxxxxxxxxxxxx
Subject:	[Xen-devel] Deferrable jobs & hypercalls
From:	Ying-Shiuan Pan <yingshiuan.pan@xxxxxxxxx>
Date:	Mon, 3 Jan 2011 14:52:12 +0800
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Hi, All,

Can anyone suggest a way to perform a long-term/periodic task inside hypervisor?
We have implemented a hypercall which performs a long-term task (e.g. a few seconds).
However, we found that if this is being called, then other hypercalls in dom0 (xm dmesg) will
be blocked until our hypercall is done.

Is there any locking between each hypercall execution or any kind of restriction to
perform tasks inside hypercall routine?

In addition, instead of puting the long-term task inside hypercall, we also try to use the timer
inside xen (i.e. init_timer, set_timer) and the workqueue patch from:
http://lists.xensource.com/archives/html/xen-devel/2010-04/msg00882.html,
but the situation remains the same to block the dom0 hypercalls.

----
Best Regards,
Ying-Shiuan Pan

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[Xen-devel] Deferrable jobs & hypercalls