Xen devel - May 2012 - Inter-domain event channel question

Hi

I want to set up an inter-domain event channel, and I want to receive interrupts
in both directions (i.e. Dom1 can independently send an interrupt to Dom2 or
vice versa).Do I need to have just 2 ports: one is on Dom 1 and the other one on
Dom 2, and on each domain I simply bind it to the corresponding interrupt
handler? Or do I need to have 4 ports: one pair is used for Dom2-to-Dom1
interrupts and the other pair for Dom1-to-Dom2 interrupts?


I would greatly appreciate if someone can explain it!


Ruslan

>>> On 03.05.12 at 20:46, Ruslan Nikolaev
<nruslan_devel@yahoo.com> wrote:
> I want to set up an inter-domain event channel, and I want to receive 
> interrupts in both directions (i.e. Dom1 can independently send an
interrupt
> to Dom2 or vice versa).Do I need to have just 2 ports: one is on Dom 1 and 
> the other one on Dom 2, and on each domain I simply bind it to the 
> corresponding interrupt handler? Or do I need to have 4 ports: one pair is 
> used for Dom2-to-Dom1 interrupts and the other pair for Dom1-to-Dom2
interrupts?
One port on each end should suffice.

Jan

Thanks!

Also, if I pass some parameters in shared buffer (a shared page between
domains), is it required to use a memory barrier before
''notify_remote_via_evtchn''?

Ruslan



----- Original Message -----
From: Jan Beulich <JBeulich@suse.com>
To: Ruslan Nikolaev <nruslan_devel@yahoo.com>
Cc: "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Sent: Friday, May 4, 2012 3:28 AM
Subject: Re: [Xen-devel] Inter-domain event channel question
>>> On 03.05.12 at 20:46, Ruslan Nikolaev
<nruslan_devel@yahoo.com> wrote:
> I want to set up an inter-domain event channel, and I want to receive 
> interrupts in both directions (i.e. Dom1 can independently send an
interrupt
> to Dom2 or vice versa).Do I need to have just 2 ports: one is on Dom 1 and 
> the other one on Dom 2, and on each domain I simply bind it to the 
> corresponding interrupt handler? Or do I need to have 4 ports: one pair is 
> used for Dom2-to-Dom1 interrupts and the other pair for Dom1-to-Dom2
interrupts?
One port on each end should suffice.

Jan


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