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Re: [Xen-devel] How to mask an event channel?

  • To: "吴佳民" <wujiamin_tyut@xxxxxxx>
  • From: "Grzegorz Miłoś" <gm281@xxxxxxxxx>
  • Date: Tue, 24 Jun 2008 07:57:39 +0100
  • Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
  • Delivery-date: Mon, 23 Jun 2008 23:58:05 -0700
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  • List-id: Xen developer discussion <xen-devel.lists.xensource.com>

>  In <Xen In seterface Manual>, chapter 5 Event Channels, they say
> that:"Event Notifications can be masked by setting a flag; this is
> equivalent to disabling interrupts and can be used to ensure atomicity of
> certain operation in the guest kernel".
> My question is :
> I know that we can use 'xc_evtchn_unmask(xcehandle, port)' to unmask an
> event channel , but I can not find the function used to mask an event
> channel.
> Can any body solve the problem?

You are looking on the userspace tools if you found the xc_ unmask. I
don't think there is the corresponding mask function there too, as
there was no need for it in the limited use of event channels that the
tools make.
You can find Linux mask/unmask functions in
linux-2.6.18-xen.hg/drivers/xen/core/evtchn.c though. Depending on
your needs you can add a new ioctl to evtchn_ioctl in
linux-2.6.18-xen.hg/drivers/xen/evtchn/evtchn.c and export it to
userspace that way.


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