linux-kernel - Re: [PATCH] kvm: don't clear level from irqfd

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Date:	Wed, 27 Jun 2012 13:03:46 +0300
From:	Gleb Natapov <gleb@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
	Alex Williamson <alex.williamson@...hat.com>
Subject: Re: [PATCH] kvm: don't clear level from irqfd

On Wed, Jun 27, 2012 at 12:13:43PM +0300, Michael S. Tsirkin wrote:
> irqfd sets and clears the level immediately.
> This used to be necessary for MSI interrupts but isn't anymore.
> 
> Note! We never officially supported irqfd for level
> interrupts but it usually seemed to kind of work,
> and this change will break it. There are no known
> real users of that feature though - only old vfio prototypes.
> Removing this line will make it easier to add
> real support for level irqfds in the future.
> 
Did we officially supported irqfd for ioapic/pic edge interrupts?
Because those will break to.

> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  virt/kvm/eventfd.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/virt/kvm/eventfd.c b/virt/kvm/eventfd.c
> index f59c1e8..4db6b01 100644
> --- a/virt/kvm/eventfd.c
> +++ b/virt/kvm/eventfd.c
> @@ -68,7 +68,6 @@ irqfd_inject(struct work_struct *work)
>  	struct kvm *kvm = irqfd->kvm;
>  
>  	kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 1);
> -	kvm_set_irq(kvm, KVM_USERSPACE_IRQ_SOURCE_ID, irqfd->gsi, 0);
>  }
>  
>  /*
> -- 
> MST

--
			Gleb.
--
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