[RFC v2 22/22] intel_iommu: process PASID-based Device-TLB invalidation

[Liu Yi L <yi.l.liu@intel.com>]

This patch adds an empty handling for PASID-based Device-TLB invalidation.
For now it is enough as it is not necessary to propagate it to host for
passthru device and also there is no emulated device has device tlb.

Cc: Kevin Tian <kevin.tian@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Peter Xu <peterx@redhat.com>
Cc: Yi Sun <yi.y.sun@linux.intel.com>
Signed-off-by: Liu Yi L <yi.l.liu@intel.com>
---
 hw/i386/intel_iommu.c          | 18 ++++++++++++++++++
 hw/i386/intel_iommu_internal.h |  1 +
 2 files changed, 19 insertions(+)

diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 5ca9ee1..1c00e9c 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -3285,6 +3285,17 @@ static bool vtd_process_inv_iec_desc(IntelIOMMUState *s,
     return true;
 }
 
+static bool vtd_process_device_piotlb_desc(IntelIOMMUState *s,
+                                           VTDInvDesc *inv_desc)
+{
+    /*
+     * no need to handle it for passthru device, for emulated
+     * devices with device tlb, it may be required, but for now,
+     * return is enough
+     */
+    return true;
+}
+
 static bool vtd_process_device_iotlb_desc(IntelIOMMUState *s,
                                           VTDInvDesc *inv_desc)
 {
@@ -3406,6 +3417,13 @@ static bool vtd_process_inv_desc(IntelIOMMUState *s)
         }
         break;
 
+    case VTD_INV_DESC_DEV_PIOTLB:
+        trace_vtd_inv_desc("device-piotlb", inv_desc.hi, inv_desc.lo);
+        if (!vtd_process_device_piotlb_desc(s, &inv_desc)) {
+            return false;
+        }
+        break;
+
     case VTD_INV_DESC_DEVICE:
         trace_vtd_inv_desc("device", inv_desc.hi, inv_desc.lo);
         if (!vtd_process_device_iotlb_desc(s, &inv_desc)) {
diff --git a/hw/i386/intel_iommu_internal.h b/hw/i386/intel_iommu_internal.h
index 6a83f6c..714dc09 100644
--- a/hw/i386/intel_iommu_internal.h
+++ b/hw/i386/intel_iommu_internal.h
@@ -390,6 +390,7 @@ typedef union VTDInvDesc VTDInvDesc;
 #define VTD_INV_DESC_WAIT               0x5 /* Invalidation Wait Descriptor */
 #define VTD_INV_DESC_PIOTLB             0x6 /* PASID-IOTLB Invalidate Desc */
 #define VTD_INV_DESC_PC                 0x7 /* PASID-cache Invalidate Desc */
+#define VTD_INV_DESC_DEV_PIOTLB         0x8 /* PASID-based-DIOTLB inv_desc*/
 #define VTD_INV_DESC_NONE               0   /* Not an Invalidate Descriptor */
 
 /* Masks for Invalidation Wait Descriptor*/
-- 
2.7.4