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

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----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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