From: Avi Kivity <avi@redhat.com>
To: "Michael S. Tsirkin" <mst@redhat.com>
Cc: Gleb Natapov <gleb@redhat.com>,
Marcelo Tosatti <mtosatti@redhat.com>,
kvm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC] kvm: enable irq injection from interrupt context
Date: Thu, 16 Sep 2010 15:14:11 +0200 [thread overview]
Message-ID: <4C921823.5080602@redhat.com> (raw)
In-Reply-To: <20100916125717.GA24284@redhat.com>
On 09/16/2010 02:57 PM, Michael S. Tsirkin wrote:
> >
> > > > If you want to split parts that asserts irq and de-asserts it then we
> > > > should have irqfd that tracks line status and knows interrupt line
> > > > polarity.
> > >
> > > Yes, it can know about polarity even though I think it's cleaner to do this
> > > per gsi. But it can not track line status as line is shared with
> > > other devices.
> > It should track only device's line status.
>
> There is no such thing as device's line status on real hardware, either.
> Devices do not drive INT# high: they drive it low (all the time)
> or do not drive it at all.
>
That's just an implementation detail. Devices either assert INT# or
they do not. Tying the wires together constitutes an AND gate. This
gate has to be modelled somewhere, currently it's in qemu's pci emulation.
--
error compiling committee.c: too many arguments to function
next prev parent reply other threads:[~2010-09-16 13:14 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-15 18:54 [PATCH RFC] kvm: enable irq injection from interrupt context Michael S. Tsirkin
2010-09-16 9:02 ` Gleb Natapov
2010-09-16 9:10 ` Michael S. Tsirkin
2010-09-16 9:25 ` Gleb Natapov
2010-09-16 9:43 ` Michael S. Tsirkin
2010-09-16 9:46 ` Avi Kivity
2010-09-16 9:53 ` Michael S. Tsirkin
2010-09-16 10:13 ` Gleb Natapov
2010-09-16 10:13 ` Michael S. Tsirkin
2010-09-16 10:20 ` Gleb Natapov
2010-09-16 10:44 ` Michael S. Tsirkin
2010-09-16 10:54 ` Gleb Natapov
2010-09-16 10:53 ` Michael S. Tsirkin
2010-09-16 11:17 ` Gleb Natapov
2010-09-16 12:13 ` Michael S. Tsirkin
2010-09-16 12:33 ` Gleb Natapov
2010-09-16 12:57 ` Michael S. Tsirkin
2010-09-16 13:14 ` Avi Kivity [this message]
2010-09-16 13:38 ` Michael S. Tsirkin
2010-09-16 13:50 ` Avi Kivity
2010-09-16 13:55 ` Gleb Natapov
2010-09-16 13:18 ` Gleb Natapov
2010-09-16 13:51 ` Michael S. Tsirkin
2010-09-16 14:06 ` Gleb Natapov
2010-09-16 14:23 ` Michael S. Tsirkin
2010-09-16 14:51 ` Gleb Natapov
2010-09-16 15:24 ` Michael S. Tsirkin
2010-09-16 15:43 ` Gleb Natapov
2010-09-16 22:07 ` Michael S. Tsirkin
2010-09-17 7:59 ` Gleb Natapov
2010-09-19 10:45 ` Michael S. Tsirkin
2010-09-19 10:56 ` Avi Kivity
2010-09-19 10:55 ` Michael S. Tsirkin
2010-09-19 11:05 ` Avi Kivity
2010-09-19 11:23 ` Michael S. Tsirkin
2010-09-19 11:18 ` Gleb Natapov
2010-09-19 11:21 ` Michael S. Tsirkin
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