linux-kernel - Re: [PATCH V2] vdpa_sim: reset must not run

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Date: Tue, 13 Feb 2024 10:15:45 -0500
From: Steven Sistare <steven.sistare@...cle.com>
To: virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org
Cc: "Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>,
        Eugenio Perez Martin <eperezma@...hat.com>,
        Si-Wei Liu <si-wei.liu@...cle.com>,
        Stefano Garzarella <sgarzare@...hat.com>
Subject: Re: [PATCH V2] vdpa_sim: reset must not run

Changes in V2:
  - test DRIVER_OK instead of FEATURES_OK
  - post singly, and add RB and acks

- Steve

On 2/9/2024 5:30 PM, Steve Sistare wrote:
> vdpasim_do_reset sets running to true, which is wrong, as it allows
> vdpasim_kick_vq to post work requests before the device has been
> configured.  To fix, do not set running until VIRTIO_CONFIG_S_DRIVER_OK
> is set.
> 
> Fixes: 0c89e2a3a9d0 ("vdpa_sim: Implement suspend vdpa op")
> Signed-off-by: Steve Sistare <steven.sistare@...cle.com>
> Reviewed-by: Eugenio Pérez <eperezma@...hat.com>
> Acked-by: Jason Wang <jasowang@...hat.com>
> ---
>  drivers/vdpa/vdpa_sim/vdpa_sim.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index be2925d0d283..18584ce70bf0 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -160,7 +160,7 @@ static void vdpasim_do_reset(struct vdpasim *vdpasim, u32 flags)
>  		}
>  	}
>  
> -	vdpasim->running = true;
> +	vdpasim->running = false;
>  	spin_unlock(&vdpasim->iommu_lock);
>  
>  	vdpasim->features = 0;
> @@ -483,6 +483,7 @@ static void vdpasim_set_status(struct vdpa_device *vdpa, u8 status)
>  
>  	mutex_lock(&vdpasim->mutex);
>  	vdpasim->status = status;
> +	vdpasim->running = (status & VIRTIO_CONFIG_S_DRIVER_OK) != 0;
>  	mutex_unlock(&vdpasim->mutex);
>  }
>