[PATCH ats_vtd v5 04/22] intel_iommu: do not consider wait_desc as an invalid descriptor

[CLEMENT MATHIEU--DRIF]

From: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>

Signed-off-by: Clément Mathieu--Drif <clement.mathieu--drif@eviden.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
---
 hw/i386/intel_iommu.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 772b1cea88..7b0c22fc07 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3476,6 +3476,11 @@ static bool vtd_process_wait_desc(IntelIOMMUState *s, 
VTDInvDesc *inv_desc)
     } else if (inv_desc->lo & VTD_INV_DESC_WAIT_IF) {
         /* Interrupt flag */
         vtd_generate_completion_event(s);
+    } else if (inv_desc->lo & VTD_INV_DESC_WAIT_FN) {
+        /*
+         * SW = 0, IF = 0, FN = 1
+         * Nothing to do as we process the events sequentially
+         */
     } else {
         error_report_once("%s: invalid wait desc: hi=%"PRIx64", lo=%"PRIx64
                           " (unknown type)", __func__, inv_desc->hi,
-- 
2.45.1