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Introduce a libqos helper module for RISC-V IOMMU testing with iommu-testdev. The helper provides routines to: - Build device contexts (DC) and 3-level page tables for SV39/SV39x4 - Program command queue (CQ), fault queue (FQ), and DDTP registers following the RISC-V IOMMU specification - Execute DMA translations and verify results The current implementation supports SV39 for S-stage and SV39x4 for G-stage translation. Support for SV48/SV48x4/SV57/SV57x4 can be added in future patches. Signed-off-by: Chao Liu <chao.liu.zevorn@gmail.com> Reviewed-by: Tao Tang <tangtao1634@phytium.com.cn> Reviewed-by: Fabiano Rosas <farosas@suse.de> Reviewed-by: Daniel Henrique Barboza <daniel.barboza@oss.qualcomm.com> Link: https://lore.kernel.org/qemu-devel/a2edf8c44f0bce26dccb91a7d13edb58be50c1a3.1770127918.git.chao.liu.zevorn@gmail.com Signed-off-by: Fabiano Rosas <farosas@suse.de>