vdpa_sim: use kvmalloc to allocate vdpasim->buffer

The next patch will make the buffer size configurable from each
device.
Since the buffer could be larger than a page, we use kvmalloc()
instead of kmalloc().

Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Stefano Garzarella <sgarzare@redhat.com>
Link: https://lore.kernel.org/r/20201215144256.155342-16-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 19ff5e3..8752989 100644 (file)
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c
@@ -418,7 +418,7 @@ static struct vdpasim *vdpasim_create(struct vdpasim_dev_attr *dev_attr)
        if (!vdpasim->iommu)
                goto err_iommu;
 
-       vdpasim->buffer = kmalloc(PAGE_SIZE, GFP_KERNEL);
+       vdpasim->buffer = kvmalloc(PAGE_SIZE, GFP_KERNEL);
        if (!vdpasim->buffer)
                goto err_iommu;
 
@@ -707,7 +707,7 @@ static void vdpasim_free(struct vdpa_device *vdpa)
        struct vdpasim *vdpasim = vdpa_to_sim(vdpa);
 
        cancel_work_sync(&vdpasim->work);
-       kfree(vdpasim->buffer);
+       kvfree(vdpasim->buffer);
        if (vdpasim->iommu)
                vhost_iotlb_free(vdpasim->iommu);
        kfree(vdpasim->vqs);