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Date: Mon, 7 Dec 2020 13:22:42 +0800 From: Jason Wang <jasowang@...hat.com> To: Stefano Garzarella <sgarzare@...hat.com>, virtualization@...ts.linux-foundation.org Cc: Stefan Hajnoczi <stefanha@...hat.com>, "Michael S. Tsirkin" <mst@...hat.com>, Oren Duer <oren@...dia.com>, Laurent Vivier <lvivier@...hat.com>, linux-kernel@...r.kernel.org, Max Gurtovoy <mgurtovoy@...dia.com>, Shahaf Shuler <shahafs@...dia.com>, Eli Cohen <elic@...dia.com> Subject: Re: [PATCH v3 12/19] vdpa_sim: make 'config' generic and usable for any device type On 2020/12/4 上午1:05, Stefano Garzarella wrote: > Add new 'config_size' attribute in 'vdpasim_dev_attr' and allocates > 'config' dynamically to support any device types. > > Signed-off-by: Stefano Garzarella <sgarzare@...hat.com> > --- > drivers/vdpa/vdpa_sim/vdpa_sim.c | 17 +++++++++++++---- > 1 file changed, 13 insertions(+), 4 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 949f4231d08a..fe71ed7890e1 100644 > --- a/drivers/vdpa/vdpa_sim/vdpa_sim.c > +++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c > @@ -62,6 +62,7 @@ struct vdpasim_virtqueue { > > struct vdpasim_dev_attr { > u64 supported_features; > + size_t config_size; > int nvqs; > u32 id; > > @@ -76,7 +77,8 @@ struct vdpasim { > struct vdpasim_dev_attr dev_attr; > /* spinlock to synchronize virtqueue state */ > spinlock_t lock; > - struct virtio_net_config config; > + /* virtio config according to device type */ > + void *config; > struct vhost_iotlb *iommu; > void *buffer; > u32 status; > @@ -376,6 +378,10 @@ static struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr) > goto err_iommu; > set_dma_ops(dev, &vdpasim_dma_ops); > > + vdpasim->config = kzalloc(dev_attr->config_size, GFP_KERNEL); > + if (!vdpasim->config) > + goto err_iommu; > + > vdpasim->vqs = kcalloc(dev_attr->nvqs, sizeof(struct vdpasim_virtqueue), > GFP_KERNEL); > if (!vdpasim->vqs) > @@ -516,7 +522,8 @@ static u64 vdpasim_get_features(struct vdpa_device *vdpa) > static int vdpasim_set_features(struct vdpa_device *vdpa, u64 features) > { > struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > - struct virtio_net_config *config = &vdpasim->config; > + struct virtio_net_config *config = > + (struct virtio_net_config *)vdpasim->config; > > /* DMA mapping must be done by driver */ > if (!(features & (1ULL << VIRTIO_F_ACCESS_PLATFORM))) > @@ -588,8 +595,8 @@ static void vdpasim_get_config(struct vdpa_device *vdpa, unsigned int offset, > { > struct vdpasim *vdpasim = vdpa_to_sim(vdpa); > > - if (offset + len < sizeof(struct virtio_net_config)) > - memcpy(buf, (u8 *)&vdpasim->config + offset, len); > + if (offset + len < vdpasim->dev_attr.config_size) > + memcpy(buf, vdpasim->config + offset, len); > } > > static void vdpasim_set_config(struct vdpa_device *vdpa, unsigned int offset, > @@ -676,6 +683,7 @@ static void vdpasim_free(struct vdpa_device *vdpa) > if (vdpasim->iommu) > vhost_iotlb_free(vdpasim->iommu); > kfree(vdpasim->vqs); > + kfree(vdpasim->config); > } > > static const struct vdpa_config_ops vdpasim_config_ops = { > @@ -738,6 +746,7 @@ static int __init vdpasim_dev_init(void) > dev_attr.id = VIRTIO_ID_NET; > dev_attr.supported_features = VDPASIM_NET_FEATURES; > dev_attr.nvqs = VDPASIM_VQ_NUM; > + dev_attr.config_size = sizeof(struct virtio_net_config); > dev_attr.work_fn = vdpasim_net_work; > > vdpasim_dev = vdpasim_create(&dev_attr);
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