Re: [Xen-devel] Xen interrupts when using passthrough

[Eli Cohen <eli@xxxxxxxxxxxxxxxxxx>]

Thanks for the information.

On Wed, Oct 05, 2011 at 10:09:01AM +0100, Jan Beulich wrote:
> >>> On 05.10.11 at 11:00, Eli Cohen <eli@xxxxxxxxxxxxxxxxxx> wrote:
> > On Wed, Oct 05, 2011 at 09:51:10AM +0100, Jan Beulich wrote:
> >> Dom0 shouldn't get involved at all - Xen does the necessary conversion.
> >> Dom0 may only be involved in setting things up. Whether they get
> >> received via event channels or virtual interrupts depends on the kind
> >> of guest.
> >> 
> > I think I used the wrong terminology not distinguishing between the
> > hypervisor and dom0 so I will ask again just to make sure. Is the
> > hypervisor involved in passing the interrupts?
> 
> Yes, of course. The hypervisor receives all physical interrupts.
> 
> > Does it depend on whether the guest is paravirtualized or not?
> 
> Yes, at least to some degree.
> 
> > The guest I am using is
> > paravirtualized (i.e uses xen hypercalls), so does it mean that it
> > uses event channels or is there a possibilty that it does not use
> > event channels.
> 
> Yes and no: PV guests can receive interrupts only via the event
> channel mechanism.
> 
> Jan

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