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xen-devel
[Xen-devel] RE: [Xen-users] Xen --> Guest
> -----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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