linux-kernel - RE: [PATCH] KVM: Use IRQF_ONESHOT for assigned device MSI interrupts

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Message-ID: <1B4B44D9196EFF41AE41FDA404FC0A100F9FC8@SHSMSX101.ccr.corp.intel.com>
Date:	Mon, 18 Jun 2012 08:46:44 +0000
From:	"Ren, Yongjie" <yongjie.ren@...el.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>, Avi Kivity <avi@...hat.com>
CC:	Jan Kiszka <jan.kiszka@...mens.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Alex Williamson <alex.williamson@...hat.com>,
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
	"mtosatti@...hat.com" <mtosatti@...hat.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH] KVM: Use IRQF_ONESHOT for assigned device MSI interrupts

> -----Original Message-----
> From: Michael S. Tsirkin [mailto:mst@...hat.com]
> Sent: Monday, June 11, 2012 6:22 PM
> To: Avi Kivity
> Cc: Jan Kiszka; Thomas Gleixner; Alex Williamson; kvm@...r.kernel.org;
> mtosatti@...hat.com; linux-kernel@...r.kernel.org; Ren, Yongjie
> Subject: Re: [PATCH] KVM: Use IRQF_ONESHOT for assigned device MSI
> interrupts
> 
> On Mon, Jun 11, 2012 at 01:01:41PM +0300, Avi Kivity wrote:
> > On 06/08/2012 05:50 PM, Jan Kiszka wrote:
> > >
> > >>
> > >> Pls correct me if I'm wrong.
> > >
> > > Well, IIRC, the "don't loop over all vcpus with IRQs or preemption
> > > disabled" was one argument against direct legacy interrupt injection as
> > > well. That's what I kept in mind from those discussions. Maybe Avi can
> > > comment on the current position.
> >
> > It's still my position.
> >
> > IMO we need something like struct gfn_to_hva_cache for interrupts.  If
> > it's in the cache, we fast-path it from the interrupt handler.  If not,
> > fall back to a workqueue and let it refill the cache.
> 
> And you class the irqfd behaviour of injecting multicast
> with interrupts disabled a bug then?
> 
Hi Avi & Michael,
Any more news on this issue ?

> > --
> > error compiling committee.c: too many arguments to function
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