wait_desc with SW=0,IF=0,FN=1 must not be considered as an
invalid descriptor as it is used to implement section 7.10 of
the VT-d spec.
Signed-off-by: Clement Mathieu--Drif <clement.mathieu--d...@eviden.com>
---
hw/i386/intel_iommu.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 83c5e44413..4e7ad3a290 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2857,7 +2857,13 @@ static bool vtd_process_wait_desc(IntelIOMMUState *s,
VTDInvDesc *inv_desc)
vtd_generate_completion_event(s);
}
- if (!(inv_desc->lo & (VTD_INV_DESC_WAIT_IF | VTD_INV_DESC_WAIT_SW))) {
+ /*
+ * SW=0, IF=0, FN=1 is also a valid descriptor (VT-d 7.10)
+ * Nothing to do as we process the descriptors in order
+ */
+
+ if (!(inv_desc->lo & (VTD_INV_DESC_WAIT_IF | VTD_INV_DESC_WAIT_SW |
+ VTD_INV_DESC_WAIT_FN))) {
error_report_once("%s: invalid wait desc: hi=%"PRIx64", lo=%"PRIx64
" (unknown type)", __func__, inv_desc->hi,
inv_desc->lo);
--
2.51.0
