On Mon, 14 Sep 2020 18:29:28 -0400
Matthew Rosato <mjros...@linux.ibm.com> wrote:
> The underlying host may be limiting the number of outstanding DMA
> requests for type 1 IOMMU. Add helper functions to check for the
> DMA available capability and retrieve the current number of DMA
> mappings allowed.
>
> Signed-off-by: Matthew Rosato <mjros...@linux.ibm.com>
> ---
> hw/vfio/common.c | 37 +++++++++++++++++++++++++++++++++++++
> include/hw/vfio/vfio-common.h | 2 ++
> 2 files changed, 39 insertions(+)
>
(...)
> +bool vfio_get_info_dma_avail(struct vfio_iommu_type1_info *info,
> + unsigned int *avail)
> +{
> + struct vfio_info_cap_header *hdr;
> + struct vfio_iommu_type1_info_dma_avail *cap;
> +
> + /* If the capability cannot be found, assume no DMA limiting */
> + hdr = vfio_get_iommu_type1_info_cap(info,
> + VFIO_IOMMU_TYPE1_INFO_DMA_AVAIL);
...don't you need a headers sync first to get the new definitions?
(...)
