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

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> 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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