From mboxrd@z Thu Jan  1 00:00:00 1970
From: Avi Kivity <avi@redhat.com>
Subject: Re: [PATCH v11] kvm: Add resampling irqfds for level triggered interrupts
Date: Sun, 23 Sep 2012 13:50:28 +0200
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References: <20120921175601.32604.63271.stgit@bling.home>
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Cc: mst@redhat.com, gleb@redhat.com, kvm@vger.kernel.org,
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To: Alex Williamson <alex.williamson@redhat.com>
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On 09/21/2012 08:58 PM, Alex Williamson wrote:
> To emulate level triggered interrupts, add a resample option to
> KVM_IRQFD.  When specified, a new resamplefd is provided that notifies
> the user when the irqchip has been resampled by the VM.  This may, for
> instance, indicate an EOI.  Also in this mode, posting of an interrupt
> through an irqfd only asserts the interrupt.  On resampling, the
> interrupt is automatically de-asserted prior to user notification.
> This enables level triggered interrupts to be posted and re-enabled
> from vfio with no userspace intervention.
>
> All resampling irqfds can make use of a single irq source ID, so we
> reserve a new one for this interface.
>

Thanks, applied.

-- 
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.