Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 15 Sep 2021 03:26:41 -0400
From:   "Michael S. Tsirkin" <mst@redhat.com>
To:     Wu Zongyong <wuzongyong@linux.alibaba.com>
Cc:     jasowang@redhat.com, virtualization@lists.linux-foundation.org,
        linux-kernel@vger.kernel.org, tiwei.bie@intel.com,
        wei.yang1@linux.alibaba.com
Subject: Re: [PATCH] vhost_vdpa: unset vq irq before freeing irq
Message-ID: <20210915032510-mutt-send-email-mst@kernel.org>
References: <02637d38dcf4e4b836c5b3a65055fe92bf812b3b.1631687872.git.wuzongyong@linux.alibaba.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <02637d38dcf4e4b836c5b3a65055fe92bf812b3b.1631687872.git.wuzongyong@linux.alibaba.com>
Precedence: bulk

On Wed, Sep 15, 2021 at 02:39:32PM +0800, Wu Zongyong wrote:
> Currently we unset vq irq after freeing irq and that will result in
> error messages:
> 
>   pi_update_irte: failed to update PI IRTE
>   irq bypass consumer (token 000000005a07a12b) unregistration fails: -22
> 
> This patch solves this.
> 
> Signed-off-by: Wu Zongyong <wuzongyong@linux.alibaba.com>
> ---
>  drivers/vhost/vdpa.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index f41d081777f5..15bae2290bf9 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -173,6 +173,10 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
>  	if (status != 0 && (ops->get_status(vdpa) & ~status) != 0)
>  		return -EINVAL;
>  
> +	if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
> +		for (i = 0; i < nvqs; i++)
> +			vhost_vdpa_unsetup_vq_irq(v, i);
> +

If we do this before reset like this then the device might assert the
irq, might it not?

>  	if (status == 0) {
>  		ret = ops->reset(vdpa);
>  		if (ret)


> @@ -184,10 +188,6 @@ static long vhost_vdpa_set_status(struct vhost_vdpa *v, u8 __user *statusp)
>  		for (i = 0; i < nvqs; i++)
>  			vhost_vdpa_setup_vq_irq(v, i);
>  
> -	if ((status_old & VIRTIO_CONFIG_S_DRIVER_OK) && !(status & VIRTIO_CONFIG_S_DRIVER_OK))
> -		for (i = 0; i < nvqs; i++)
> -			vhost_vdpa_unsetup_vq_irq(v, i);
> -
>  	return 0;


>  }
>  
> -- 
> 2.31.1