linux-kernel - Re: [PATCH v2 5/7] vfio/platform: Disable virqfds on cleanup

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Date: Mon, 11 Mar 2024 10:16:35 +0100
From: Eric Auger <eric.auger@...hat.com>
To: Alex Williamson <alex.williamson@...hat.com>
Cc: kvm@...r.kernel.org, clg@...hat.com, reinette.chatre@...el.com,
 linux-kernel@...r.kernel.org, kevin.tian@...el.com, stable@...r.kernel.org
Subject: Re: [PATCH v2 5/7] vfio/platform: Disable virqfds on cleanup

Hi Alex,

On 3/9/24 00:05, Alex Williamson wrote:
> irqfds for mask and unmask that are not specifically disabled by the
> user are leaked.  Remove any irqfds during cleanup
>
> Cc: Eric Auger <eric.auger@...hat.com>
> Cc: stable@...r.kernel.org
> Fixes: a7fa7c77cf15 ("vfio/platform: implement IRQ masking/unmasking via an eventfd")
> Signed-off-by: Alex Williamson <alex.williamson@...hat.com>

Reviewed-by: Eric Auger <eric.auger@...hat.com>

Eric
> ---
>  drivers/vfio/platform/vfio_platform_irq.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vfio/platform/vfio_platform_irq.c b/drivers/vfio/platform/vfio_platform_irq.c
> index 61a1bfb68ac7..e5dcada9e86c 100644
> --- a/drivers/vfio/platform/vfio_platform_irq.c
> +++ b/drivers/vfio/platform/vfio_platform_irq.c
> @@ -321,8 +321,11 @@ void vfio_platform_irq_cleanup(struct vfio_platform_device *vdev)
>  {
>  	int i;
>  
> -	for (i = 0; i < vdev->num_irqs; i++)
> +	for (i = 0; i < vdev->num_irqs; i++) {
> +		vfio_virqfd_disable(&vdev->irqs[i].mask);
> +		vfio_virqfd_disable(&vdev->irqs[i].unmask);
>  		vfio_set_trigger(vdev, i, -1, NULL);
> +	}
>  
>  	vdev->num_irqs = 0;
>  	kfree(vdev->irqs);