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Some device information returned by ioctl(IOMMU_GET_HW_INFO) are vendor specific. Save them as raw data in a union supporting different vendors, then vendor IOMMU can query the raw data with its fixed format for capability directly. Because IOMMU_GET_HW_INFO is only supported in linux, so declare those capability related structures with CONFIG_LINUX. Suggested-by: Eric Auger <eric.auger@redhat.com> Suggested-by: Nicolin Chen <nicolinc@nvidia.com> Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com> Reviewed-by: Nicolin Chen <nicolinc@nvidia.com> Reviewed-by: Eric Auger <eric.auger@redhat.com> Link: https://lore.kernel.org/qemu-devel/20250604062115.4004200-5-zhenzhong.duan@intel.com Signed-off-by: Cédric Le Goater <clg@redhat.com>