linux-kernel - Re: [PATCH v2 08/17] vdpa_sim: add supported_features field in vdpasim_dev

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Date:   Mon, 30 Nov 2020 11:14:55 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     Stefano Garzarella <sgarzare@...hat.com>,
        virtualization@...ts.linux-foundation.org
Cc:     Stefan Hajnoczi <stefanha@...hat.com>,
        linux-kernel@...r.kernel.org, Laurent Vivier <lvivier@...hat.com>,
        Max Gurtovoy <mgurtovoy@...dia.com>,
        "Michael S. Tsirkin" <mst@...hat.com>, Eli Cohen <elic@...dia.com>
Subject: Re: [PATCH v2 08/17] vdpa_sim: add supported_features field in
 vdpasim_dev_attr


On 2020/11/26 下午10:49, Stefano Garzarella wrote:
> Introduce a new VDPASIM_FEATURES macro with the generic features
> supported by the vDPA simulator, and VDPASIM_NET_FEATURES macro with
> vDPA-net features.
>
> Add 'supported_features' field in vdpasim_dev_attr, to allow devices
> to specify their features.
>
> Co-developed-by: Max Gurtovoy <mgurtovoy@...dia.com>
> Signed-off-by: Max Gurtovoy <mgurtovoy@...dia.com>
> Signed-off-by: Stefano Garzarella <sgarzare@...hat.com>
> ---
>   drivers/vdpa/vdpa_sim/vdpa_sim.c | 29 ++++++++++++++++++-----------
>   1 file changed, 18 insertions(+), 11 deletions(-)


Acked-by: Jason Wang <jasowang@...hat.com>


>
> diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> index 393b54a9f0e4..36677fc3631b 100644
> --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
> +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
> @@ -49,12 +49,15 @@ struct vdpasim_virtqueue {
>   #define VDPASIM_VQ_NUM 0x2
>   #define VDPASIM_NAME "vdpasim-netdev"
>   
> -static u64 vdpasim_features = (1ULL << VIRTIO_F_ANY_LAYOUT) |
> -			      (1ULL << VIRTIO_F_VERSION_1)  |
> -			      (1ULL << VIRTIO_F_ACCESS_PLATFORM) |
> -			      (1ULL << VIRTIO_NET_F_MAC);
> +#define VDPASIM_FEATURES	((1ULL << VIRTIO_F_ANY_LAYOUT) | \
> +				 (1ULL << VIRTIO_F_VERSION_1)  | \
> +				 (1ULL << VIRTIO_F_ACCESS_PLATFORM))
> +
> +#define VDPASIM_NET_FEATURES	(VDPASIM_FEATURES | \
> +				 (1ULL << VIRTIO_NET_F_MAC))
>   
>   struct vdpasim_dev_attr {
> +	u64 supported_features;
>   	int nvqs;
>   	u32 id;
>   };
> @@ -112,7 +115,7 @@ static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
>   {
>   	struct vdpasim_virtqueue *vq = &vdpasim->vqs[idx];
>   
> -	vringh_init_iotlb(&vq->vring, vdpasim_features,
> +	vringh_init_iotlb(&vq->vring, vdpasim->dev_attr.supported_features,
>   			  VDPASIM_QUEUE_MAX, false,
>   			  (struct vring_desc *)(uintptr_t)vq->desc_addr,
>   			  (struct vring_avail *)
> @@ -121,7 +124,8 @@ static void vdpasim_queue_ready(struct vdpasim *vdpasim, unsigned int idx)
>   			  (uintptr_t)vq->device_addr);
>   }
>   
> -static void vdpasim_vq_reset(struct vdpasim_virtqueue *vq)
> +static void vdpasim_vq_reset(struct vdpasim *vdpasim,
> +			     struct vdpasim_virtqueue *vq)
>   {
>   	vq->ready = false;
>   	vq->desc_addr = 0;
> @@ -129,8 +133,8 @@ static void vdpasim_vq_reset(struct vdpasim_virtqueue *vq)
>   	vq->device_addr = 0;
>   	vq->cb = NULL;
>   	vq->private = NULL;
> -	vringh_init_iotlb(&vq->vring, vdpasim_features, VDPASIM_QUEUE_MAX,
> -			  false, NULL, NULL, NULL);
> +	vringh_init_iotlb(&vq->vring, vdpasim->dev_attr.supported_features,
> +			  VDPASIM_QUEUE_MAX, false, NULL, NULL, NULL);
>   }
>   
>   static void vdpasim_reset(struct vdpasim *vdpasim)
> @@ -138,7 +142,7 @@ static void vdpasim_reset(struct vdpasim *vdpasim)
>   	int i;
>   
>   	for (i = 0; i < vdpasim->dev_attr.nvqs; i++)
> -		vdpasim_vq_reset(&vdpasim->vqs[i]);
> +		vdpasim_vq_reset(vdpasim, &vdpasim->vqs[i]);
>   
>   	spin_lock(&vdpasim->iommu_lock);
>   	vhost_iotlb_reset(vdpasim->iommu);
> @@ -498,7 +502,9 @@ static u32 vdpasim_get_vq_align(struct vdpa_device *vdpa)
>   
>   static u64 vdpasim_get_features(struct vdpa_device *vdpa)
>   {
> -	return vdpasim_features;
> +	struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
> +
> +	return vdpasim->dev_attr.supported_features;
>   }
>   
>   static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
> @@ -510,7 +516,7 @@ static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features)
>   	if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM)))
>   		return -EINVAL;
>   
> -	vdpasim->features = features & vdpasim_features;
> +	vdpasim->features = features & vdpasim->dev_attr.supported_features;
>   
>   	/* We generally only know whether guest is using the legacy interface
>   	 * here, so generally that's the earliest we can set config fields.
> @@ -722,6 +728,7 @@ static int __init vdpasim_dev_init(void)
>   	struct vdpasim_dev_attr dev_attr = {};
>   
>   	dev_attr.id = VIRTIO_ID_NET;
> +	dev_attr.supported_features = VDPASIM_NET_FEATURES;
>   	dev_attr.nvqs = VDPASIM_VQ_NUM;
>   
>   	vdpasim_dev = vdpasim_create(&dev_attr);