vdpa_sim: make vdpasim->buffer size configurable

Allow each device to specify the size of the buffer allocated
in vdpa_sim.

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20201215144256.155342-17-sgarzare@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/drivers/vdpa/vdpa_sim/vdpa_sim.c b/drivers/vdpa/vdpa_sim/vdpa_sim.c
index 87529899033acad7bc179d0caabd1cc80e642985..60e45db29b158081adbe5395cbbb46946e218d96 100644 (file)
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -73,6 +73,7 @@ struct vdpasim;
 struct vdpasim_dev_attr {
        u64 supported_features;
        size_t config_size;
+       size_t buffer_size;
        int nvqs;
        u32 id;
 
@@ -418,7 +419,7 @@ static struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
        if (!vdpasim->iommu)
                goto err_iommu;
 
-       vdpasim->buffer = kvmalloc(PAGE_SIZE, GFP_KERNEL);
+       vdpasim->buffer = kvmalloc(dev_attr->buffer_size, GFP_KERNEL);
        if (!vdpasim->buffer)
                goto err_iommu;
 
@@ -787,6 +788,7 @@ static int __init vdpasim_dev_init(void)
        dev_attr.config_size = sizeof(struct virtio_net_config);
        dev_attr.get_config = vdpasim_net_get_config;
        dev_attr.work_fn = vdpasim_net_work;
+       dev_attr.buffer_size = PAGE_SIZE;
 
        vdpasim_dev = vdpasim_create(&dev_attr);