Add a STAGE1_SUPPORTED check in the CMD_CFGI_CD and CMD_CFGI_CD_ALL path
and return CERROR_ILL when stage-1 translation is not implemented,
matching the architecture requirement (IHI 0070G.b, page 176).

Fixes: 32cfd7f39e08 ("hw/arm/smmuv3: Cache/invalidate config data")
Signed-off-by: Tao Tang <tangtao1634@phytium.com.cn>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Reviewed-by: Mostafa Saleh <smostafa@google.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Links: https://lore.kernel.org/qemu-devel/20260221101733.2995020-1-tangtao1634@phytium.com.cn/
---
 hw/arm/smmuv3.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/hw/arm/smmuv3.c b/hw/arm/smmuv3.c
index c08d58c5790..293d04463e3 100644
--- a/hw/arm/smmuv3.c
+++ b/hw/arm/smmuv3.c
@@ -1399,6 +1399,15 @@ static int smmuv3_cmdq_consume(SMMUv3State *s, Error **errp)
                 break;
             }
 
+            /*
+             * This command raises CERROR_ILL when stage 1 is not implemented
+             * according to (IHI 0070G.b) Page 176.
+             */
+            if (!STAGE1_SUPPORTED(s)) {
+                cmd_error = SMMU_CERROR_ILL;
+                break;
+            }
+
             trace_smmuv3_cmdq_cfgi_cd(sid);
             smmuv3_flush_config(sdev);
             if (!smmuv3_accel_issue_inv_cmd(s, &cmd, sdev, errp)) {
-- 
2.34.1