Re: [PATCH v2] vdpa_sim: Use iova_shift() for the size passed to alloc_iova()

The size passed to alloc_iova() should be the size of page frames.
Now we use byte granularity for the iova domain, so it's safe to
pass the size in bytes to alloc_iova(). But it would be better to use
iova_shift() for the size to avoid future bugs if we change granularity.

Signed-off-by: Xie Yongji <redacted>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.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 14e024de5cbf..1ccf615221fe 100644
--- a/drivers/vdpa/vdpa_sim/vdpa_sim.c
+++ b/drivers/vdpa/vdpa_sim/vdpa_sim.c

@@ -137,7 +137,8 @@ static dma_addr_t vdpasim_map_range(struct vdpasim *vdpasim, phys_addr_t paddr,
  	int ret;
  
  	/* We set the limit_pfn to the maximum (ULONG_MAX - 1) */
-	iova = alloc_iova(&vdpasim->iova, size, ULONG_MAX - 1, true);
+	iova = alloc_iova(&vdpasim->iova, size >> iova_shift(&vdpasim->iova),
+			  ULONG_MAX - 1, true);
  	if (!iova)
  		return DMA_MAPPING_ERROR;