On Thu, 7 Jan 2021 12:44:01 +0800
Keqian Zhu <zhukeqi...@huawei.com> wrote:
> We always use the smallest supported page size of vfio_iommu as
> pgsize. Drop parameter "pgsize" of update_user_bitmap.
>
> Signed-off-by: Keqian Zhu <zhukeqi...@huawei.com>
> ---
> drivers/vfio/vfio_iommu_type1.c | 9 ++++-----
> 1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c
> index 82649a040148..bceda5e8baaa 100644
> --- a/drivers/vfio/vfio_iommu_type1.c
> +++ b/drivers/vfio/vfio_iommu_type1.c
> @@ -978,10 +978,9 @@ static void vfio_update_pgsize_bitmap(struct vfio_iommu
> *iommu)
> }
>
> static int update_user_bitmap(u64 __user *bitmap, struct vfio_iommu *iommu,
> - struct vfio_dma *dma, dma_addr_t base_iova,
> - size_t pgsize)
> + struct vfio_dma *dma, dma_addr_t base_iova)
> {
> - unsigned long pgshift = __ffs(pgsize);
> + unsigned long pgshift = __ffs(iommu->pgsize_bitmap);
> unsigned long nbits = dma->size >> pgshift;
> unsigned long bit_offset = (dma->iova - base_iova) >> pgshift;
> unsigned long copy_offset = bit_offset / BITS_PER_LONG;
> @@ -1046,7 +1045,7 @@ static int vfio_iova_dirty_bitmap(u64 __user *bitmap,
> struct vfio_iommu *iommu,
> if (dma->iova > iova + size - 1)
> break;
>
> - ret = update_user_bitmap(bitmap, iommu, dma, iova, pgsize);
> + ret = update_user_bitmap(bitmap, iommu, dma, iova);
> if (ret)
> return ret;
>
> @@ -1192,7 +1191,7 @@ static int vfio_dma_do_unmap(struct vfio_iommu *iommu,
>
> if (unmap->flags & VFIO_DMA_UNMAP_FLAG_GET_DIRTY_BITMAP) {
> ret = update_user_bitmap(bitmap->data, iommu, dma,
> - unmap->iova, pgsize);
> + unmap->iova);
> if (ret)
> break;
> }
Same as the previous, both call sites already have both pgsize and
pgshift, pass both rather than recalculate. Thanks,
Alex
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