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Re: [Xen-devel] RE: [Xen-users] Xen --> Guest
Do you require notification in the kernel or in user space? If it
will suffice to get the notification in user space, then you can
simply use the xc_evtchn_* functions in libxc, which enable you to
poll or block on the event channel. See tools/console/daemon/io.c for
an example of where this is used.
Regards,
Derek Murray.
On 21 Mar 2007, at 16:25, Petersson, Mats wrote:
-----Original Message-----
From: Security Initiative Team [mailto:passrete@xxxxxxxxx]
Sent: 21 March 2007 16:17
To: Petersson, Mats; xen-devel@xxxxxxxxxxxxxxxxxxx;
xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Xen --> Guest
Yes, that's what I figured.
But, I haven't really been able to figure out how to actually
implement
a new event channel.
I did create a new Virtual interrupt and registered it on the
DomU side.
I was able to bind to it on the Xen side.
However, the
vcpu_info->evtchn_upcall_pending variable doesn't seem
to get set correctly.
I have v->vcpu_info->evtchn_upcall_mask = 0.
Plus, I'm not quite sure how to do the polling on the DomU side.
If you have a good idea as to how to implement it,
please do let me know.
This is definitely a "xen-devel" question, so I removed the Xen-users
from distribution list.
I'm not an expert on Event-channel operations, but it certainly should
be possible to set this up.
This part of the Xen interface document could be useful, I think:
http://www.cl.cam.ac.uk/research/srg/netos/xen/readmes/interface/
interfa
ce.html#SECTION00600000000000000000
--
Mats
"Petersson, Mats" <Mats.Petersson@xxxxxxx> wrote:
> -----Original Message-----
> From: Security Initiative Team [mailto:passrete@xxxxxxxxx]
> Sent: 21 March 2007 15:55
> To: Petersson, Mats; xen-devel@xxxxxxxxxxxxxxxxxxx;
> xen-users@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-users] Xen --> Guest
>
> I have some monitoring capabilities set up in Xen
> and when that is triggered, I want to notify the DomU
> to take some action.
>
> Example: If a certain part of memory is touched, Xen
> sees that and wants to inform the DomU of this.
>
> So, all I need is to set a bit somewhere that can
> be constantly polled by the DomU (waiting for it to flip)
And isn't this EXACTLY what the event-channel does?
--
Mats
>
> Thanks,
> -Brian
>
> "Petersson, Mats" wrote:
>
>
>
> > -----Original Message-----
> > From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
> > [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of
> > Security Initiative Team
> > Sent: 21 March 2007 01:03
> > To: xen-devel@xxxxxxxxxxxxxxxxxxx;
> xen-users@xxxxxxxxxxxxxxxxxxx
> > Subject: [Xen-users] Xen --> Guest
> >
> > What's the easiest way to send 1-bit of information from
> > Xen to a guest domain?
>
> What do you want this 1-bit of information to achieve
> at the other
> end...
>
> Without actually knowing what you're trying to achieve,
> it's kind of
> hard to answer the question.
>
> --
> Mats
> >
> > The event channel mechanism seems fairly complicated.
> >
> > Thanks,
> > -Brian
> >
> >
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