Re: [PATCH v2 20/26] xen/domctl: wrap iommu-related domctl op with CONFIG_MGMT_HYPERCALLS

[Stefano Stabellini <sstabellini@xxxxxxxxxx>]

On Wed, 10 Sep 2025, Penny Zheng wrote:
> Function iommu_do_domctl() is the main entry for all iommu-related domctl-op,
> and shall be wrapped with CONFIG_MGMT_HYPERCALLS.
> Tracking its calling chain, the following functions shall all be wrapped
> with CONFIG_MGMT_HYPERCALLS:
> - iommu_do_pci_domctl
>   - iommu_get_device_group
>     - amd_iommu_group_id/intel_iommu_group_id
>   - device_assigned
>   - assign_device
>     - intel_iommu_assign_device/amd_iommu_assign_device
>   - deassign_device
>     - reassign_device_ownership/reassign_device
> - iommu_do_dt_domctl
>   - iommu_deassign_dt_device
>     - arm_smmu_reassign_dev/arm_smmu_reassign_dev
>     - ipmmu_reassign_dev
>       - ipmmu_deassign_dev
>         - ipmmu_detach_dev
>   - dt_find_node_by_gpath
> Wrap XEN_DOMCTL_assign_device{test_assign_device,deassign_device,
> get_device_group}-case transiently with CONFIG_MGMT_HYPERCALLS,
> and it will be removed when introducing CONFIG_MGMT_HYPERCALLS on the whole
> domctl.c in the last.
> 
> Signed-off-by: Penny Zheng <Penny.Zheng@xxxxxxx>

drivers/passthrough/arm/smmu.c:2852:12: error: ‘arm_smmu_deassign_dev’ defined 
but not used [-Werror=unused-function]
 2852 | static int arm_smmu_deassign_dev(struct domain *d, uint8_t devfn,
      |            ^~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors