Re: [PATCH v4 03/12] backends/iommufd: Extend iommufd_backend_get_device_info() to fetch HW capabilities

[Eric Auger <eric.auger@redhat.com>]

Hi Joao,

On 7/12/24 13:46, Joao Martins wrote:
> The helper will be able to fetch vendor agnostic IOMMU capabilities
> supported both by hardware and software. Right now it is only iommu dirty
> tracking.
>
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
> Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric
> ---
>  include/sysemu/iommufd.h | 2 +-
>  backends/iommufd.c       | 4 +++-
>  hw/vfio/iommufd.c        | 4 +++-
>  3 files changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/include/sysemu/iommufd.h b/include/sysemu/iommufd.h
> index 9edfec604595..57d502a1c79a 100644
> --- a/include/sysemu/iommufd.h
> +++ b/include/sysemu/iommufd.h
> @@ -49,7 +49,7 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
>                                hwaddr iova, ram_addr_t size);
>  bool iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
>                                       uint32_t *type, void *data, uint32_t len,
> -                                     Error **errp);
> +                                     uint64_t *caps, Error **errp);
>  
>  #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd"
>  #endif
> diff --git a/backends/iommufd.c b/backends/iommufd.c
> index 84fefbc9ee7a..2b3d51af26d2 100644
> --- a/backends/iommufd.c
> +++ b/backends/iommufd.c
> @@ -210,7 +210,7 @@ int iommufd_backend_unmap_dma(IOMMUFDBackend *be, uint32_t ioas_id,
>  
>  bool iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
>                                       uint32_t *type, void *data, uint32_t len,
> -                                     Error **errp)
> +                                     uint64_t *caps, Error **errp)
>  {
>      struct iommu_hw_info info = {
>          .size = sizeof(info),
> @@ -226,6 +226,8 @@ bool iommufd_backend_get_device_info(IOMMUFDBackend *be, uint32_t devid,
>  
>      g_assert(type);
>      *type = info.out_data_type;
> +    g_assert(caps);
> +    *caps = info.out_capabilities;
>  
>      return true;
>  }
> diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
> index c2f158e60386..604eaa4d9a5d 100644
> --- a/hw/vfio/iommufd.c
> +++ b/hw/vfio/iommufd.c
> @@ -628,11 +628,13 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
>      union {
>          struct iommu_hw_info_vtd vtd;
>      } data;
> +    uint64_t hw_caps;
>  
>      hiod->agent = opaque;
>  
>      if (!iommufd_backend_get_device_info(vdev->iommufd, vdev->devid,
> -                                         &type, &data, sizeof(data), errp)) {
> +                                         &type, &data, sizeof(data),
> +                                         &hw_caps, errp)) {
>          return false;
>      }
>