linux-kernel - Re: [PATCH] vhost-vdpa: clean irqs before reseting vdpa device

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Date:   Mon, 15 Nov 2021 05:56:17 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Wu Zongyong <wuzongyong@...ux.alibaba.com>
Cc:     jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org, wei.yang1@...ux.alibaba.com
Subject: Re: [PATCH] vhost-vdpa: clean irqs before reseting vdpa device

On Mon, Nov 15, 2021 at 11:16:42AM +0800, Wu Zongyong wrote:
> Vdpa devices should be reset after unseting irqs of virtqueues, or we
> will get errors when killing qemu process:
> 
> >> pi_update_irte: failed to update PI IRTE
> >> irq bypass consumer (token 0000000065102a43) unregistration fails: -22
> 
> Signed-off-by: Wu Zongyong <wuzongyong@...ux.alibaba.com>


A Fixes flag might be appropriate here.  2cf1ba9a4d15c ?

Also, remind me of commit 97f854be203883b61d24f230445bd533bbdf770c
vhost_vdpa: unset vq irq before freeing irq - what's the difference
in scenarios?


> ---
>  drivers/vhost/vdpa.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 01c59ce7e250..29cced1cd277 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -1014,12 +1014,12 @@ static int vhost_vdpa_release(struct inode *inode, struct file *filep)
>  
>  	mutex_lock(&d->mutex);
>  	filep->private_data = NULL;
> +	vhost_vdpa_clean_irq(v);
>  	vhost_vdpa_reset(v);
>  	vhost_dev_stop(&v->vdev);
>  	vhost_vdpa_iotlb_free(v);
>  	vhost_vdpa_free_domain(v);
>  	vhost_vdpa_config_put(v);
> -	vhost_vdpa_clean_irq(v);
>  	vhost_dev_cleanup(&v->vdev);
>  	kfree(v->vdev.vqs);
>  	mutex_unlock(&d->mutex);
> -- 
> 2.31.1