linux-kernel - Re: [PATCH RFC] kvm: enable irq injection from interrupt context

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Message-ID: <20100919112323.GE7350@redhat.com>
Date:	Sun, 19 Sep 2010 13:23:23 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Avi Kivity <avi@...hat.com>
Cc:	Gleb Natapov <gleb@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC] kvm: enable irq injection from interrupt context

On Sun, Sep 19, 2010 at 01:05:09PM +0200, Avi Kivity wrote:
>  On 09/19/2010 12:55 PM, Michael S. Tsirkin wrote:
> >On Sun, Sep 19, 2010 at 12:56:12PM +0200, Avi Kivity wrote:
> >>   On 09/19/2010 12:45 PM, Michael S. Tsirkin wrote:
> >>  >On Fri, Sep 17, 2010 at 09:59:29AM +0200, Gleb Natapov wrote:
> >>  >>   >   writing 0 to eventfd does nothing. The way to deassert irq
> >>  >>   That is implementation detail of current irqfd. It was designed for MSI
> >>  >>   not level triggered interrupts.
> >>  >
> >>  >Maybe we should add a check that gsi is mapped to MSI (or unmapped) then?
> >>  >Level which switches to 1 and back to 0 immediately will be racy anyway
> >>  >...
> >>  >
> >>
> >>  Add a check where?
> >
> >I would make sure that if you bind irqfd to a non-MSI GSI,
> >signalling it has no effect.
> >
> 
> Certainly.  We should also update the documentation, when we have
> irqfd documentation.

When and if we start supporing level, we'll have to add a capability flag.
By way of documentation, reserve a bit value in header right now?

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