From: Zhenzhong Duan <zhenzhong.duan@intel.com>

According to VTD spec, Figure 11-22, Invalidation Queue Tail Register,
"When Descriptor Width (DW) field in Invalidation Queue Address Register
(IQA_REG) is Set (256-bit descriptors), hardware treats bit-4 as reserved
and a value of 1 in the bit will result in invalidation queue error."

Current code missed to send IQE event to guest, fix it.

Fixes: c0c1d351849b ("intel_iommu: add 256 bits qi_desc support")
Suggested-by: Yi Liu <yi.l.liu@intel.com>
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Message-Id: <20241104125536.1236118-2-zhenzhong.duan@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/i386/intel_iommu.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 8612d0917b..1ecfe47963 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2847,6 +2847,7 @@ static void vtd_handle_iqt_write(IntelIOMMUState *s)
     if (s->iq_dw && (val & VTD_IQT_QT_256_RSV_BIT)) {
         error_report_once("%s: RSV bit is set: val=0x%"PRIx64,
                           __func__, val);
+        vtd_handle_inv_queue_error(s);
         return;
     }
     s->iq_tail = VTD_IQT_QT(s->iq_dw, val);
-- 
MST