linux-kernel - Re: [RFC V1 09/13] vdpa

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Date: Tue, 16 Jan 2024 19:33:05 +0100
From: Eugenio Perez Martin <eperezma@...hat.com>
To: Steve Sistare <steven.sistare@...cle.com>
Cc: virtualization@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, 
	"Michael S. Tsirkin" <mst@...hat.com>, Jason Wang <jasowang@...hat.com>, Si-Wei Liu <si-wei.liu@...cle.com>, 
	Xuan Zhuo <xuanzhuo@...ux.alibaba.com>, Dragos Tatulea <dtatulea@...dia.com>, 
	Eli Cohen <elic@...dia.com>, Xie Yongji <xieyongji@...edance.com>
Subject: Re: [RFC V1 09/13] vdpa_sim: reset must not run

On Wed, Jan 10, 2024 at 9:40 PM Steve Sistare <steven.sistare@...cle.com> 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_FEATURES_OK
> is set.
>
> Signed-off-by: Steve Sistare <steven.sistare@...cle.com>

Good catch, thanks! Please send this separately so it can be merged
independently.

Also, the Fixes tag is missing, isn't it?

Fixes: 0c89e2a3a9d0 ("vdpa_sim: Implement suspend vdpa op")

Reviewed-by: Eugenio Pérez <eperezma@...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..6304cb0b4770 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_FEATURES_OK) != 0;
>         mutex_unlock(&vdpasim->mutex);
>  }
>
> --
> 2.39.3
>