Re: [PATCH v6 3/9] vfio/iommufd: Add hw_caps field to HostIOMMUDeviceCaps

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

On 7/22/24 23:13, Joao Martins wrote:
> Store the value of @caps returned by iommufd_backend_get_device_info()
> in a new field HostIOMMUDeviceCaps::hw_caps. Right now the only value is
> whether device IOMMU supports dirty tracking (IOMMU_HW_CAP_DIRTY_TRACKING).
>
> This is in preparation for HostIOMMUDevice::realize() being called early
> during attach_device().
>
> Signed-off-by: Joao Martins <joao.m.martins@oracle.com>
> Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>

Eric
> ---
>  include/sysemu/host_iommu_device.h | 4 ++++
>  hw/vfio/iommufd.c                  | 1 +
>  2 files changed, 5 insertions(+)
>
> diff --git a/include/sysemu/host_iommu_device.h b/include/sysemu/host_iommu_device.h
> index d1c10ff7c239..809cced4ba5c 100644
> --- a/include/sysemu/host_iommu_device.h
> +++ b/include/sysemu/host_iommu_device.h
> @@ -19,9 +19,13 @@
>   * struct HostIOMMUDeviceCaps - Define host IOMMU device capabilities.
>   *
>   * @type: host platform IOMMU type.
> + *
> + * @hw_caps: host platform IOMMU capabilities (e.g. on IOMMUFD this represents
> + *           the @out_capabilities value returned from IOMMU_GET_HW_INFO ioctl)
>   */
>  typedef struct HostIOMMUDeviceCaps {
>      uint32_t type;
> +    uint64_t hw_caps;
>  } HostIOMMUDeviceCaps;
>  
>  #define TYPE_HOST_IOMMU_DEVICE "host-iommu-device"
> diff --git a/hw/vfio/iommufd.c b/hw/vfio/iommufd.c
> index 5bb623879abe..5e2fc1ce089d 100644
> --- a/hw/vfio/iommufd.c
> +++ b/hw/vfio/iommufd.c
> @@ -724,6 +724,7 @@ static bool hiod_iommufd_vfio_realize(HostIOMMUDevice *hiod, void *opaque,
>  
>      hiod->name = g_strdup(vdev->name);
>      caps->type = type;
> +    caps->hw_caps = hw_caps;
>  
>      return true;
>  }