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From: Eli Cohen <eli@dev.mellanox.co.il>
To: Jan Beulich <JBeulich@suse.com>
Cc: Andrew Cooper <andrew.cooper3@citrix.com>,
	"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: Xen interrupts when using passthrough
Date: Wed, 5 Oct 2011 11:45:35 +0200	[thread overview]
Message-ID: <20111005094535.GE2681@mtldesk30> (raw)
In-Reply-To: <4E8C3ACD0200007800059694@nat28.tlf.novell.com>

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@dev.mellanox.co.il> 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

  reply	other threads:[~2011-10-05  9:45 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-10-04 16:29 Xen interrupts when using passthrough Eli Cohen
2011-10-04 16:50 ` Andrew Cooper
2011-10-04 19:00   ` Eli Cohen
2011-10-05  7:27     ` Jan Beulich
2011-10-05  8:26       ` Eli Cohen
2011-10-05  8:51         ` Jan Beulich
2011-10-05  9:00           ` Eli Cohen
2011-10-05  9:09             ` Jan Beulich
2011-10-05  9:45               ` Eli Cohen [this message]
2011-10-05  9:54               ` Ian Campbell

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