linux-kernel - Re: [PATCH v11] kvm: Add resampling irqfds for level triggered interrupts

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Message-ID: <505EF784.7060504@redhat.com>
Date:	Sun, 23 Sep 2012 13:50:28 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
CC:	mst@...hat.com, gleb@...hat.com, kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v11] kvm: Add resampling irqfds for level triggered interrupts

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.

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