linux-kernel - Re: [PATCH v2 2/6] kvm: Add missing KVM

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Date:	Wed, 27 Jun 2012 12:53:45 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Alex Williamson <alex.williamson@...hat.com>
Cc:	avi@...hat.com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	jan.kiszka@...mens.com
Subject: Re: [PATCH v2 2/6] kvm: Add missing KVM_IRQFD API documentation

On Tue, Jun 26, 2012 at 11:09:17PM -0600, Alex Williamson wrote:
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

Acked-by: Michael S. Tsirkin <mst@...hat.com>

> ---
> 
>  Documentation/virtual/kvm/api.txt |   16 ++++++++++++++++
>  1 file changed, 16 insertions(+)
> 
> diff --git a/Documentation/virtual/kvm/api.txt b/Documentation/virtual/kvm/api.txt
> index 310fe50..ea9edce 100644
> --- a/Documentation/virtual/kvm/api.txt
> +++ b/Documentation/virtual/kvm/api.txt
> @@ -1965,6 +1965,22 @@ return the hash table order in the parameter.  (If the guest is using
>  the virtualized real-mode area (VRMA) facility, the kernel will
>  re-create the VMRA HPTEs on the next KVM_RUN of any vcpu.)
>  
> +4.76 KVM_IRQFD
> +
> +Capability: KVM_CAP_IRQFD
> +Architectures: x86
> +Type: vm ioctl
> +Parameters: struct kvm_irqfd (in)
> +Returns: 0 on success, -1 on error
> +
> +Allows setting an eventfd to directly trigger a guest interrupt.
> +kvm_irqfd.fd specifies the file descriptor to use as the eventfd and
> +kvm_irqfd.gsi specifies the irqchip pin toggled by this event.  When
> +an event is tiggered on the eventfd, an interrupt is injected into
> +the guest using the specified gsi pin.  The irqfd is removed using
> +the KVM_IRQFD_FLAG_DEASSIGN flag, specifying both kvm_irqfd.fd
> +and kvm_irqfd.gsi.
> +
>  
>  5. The kvm_run structure
>  ------------------------
--
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