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charset="utf-8" wait_desc with SW=3D0,IF=3D0,FN=3D1 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 --- 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); } =20 - if (!(inv_desc->lo & (VTD_INV_DESC_WAIT_IF | VTD_INV_DESC_WAIT_SW))) { + /* + * SW=3D0, IF=3D0, FN=3D1 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=3D%"PRIx64", lo=3D%"P= RIx64 " (unknown type)", __func__, inv_desc->hi, inv_desc->lo); --=20 2.51.0