[PATCH v2 3/5] memory: Add IOMMU_NOTIFIER_DEVIOTLB_UNMAP IOMMUTLBNotificationType

[Eugenio Pérez]

This allows us to differentiate between regular IOMMU map/unmap events
and DEVIOTLB unmap. Doing so, notifiers that only need device IOTLB
invalidations will not receive regular IOMMU unmappings.

Adapt intel and vhost to use it.

Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
---
 include/exec/memory.h | 7 ++++++-
 hw/i386/intel_iommu.c | 2 +-
 hw/virtio/vhost.c     | 2 +-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/include/exec/memory.h b/include/exec/memory.h
index ab60870c76..f33ee672c6 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -82,9 +82,14 @@ typedef enum {
     IOMMU_NOTIFIER_UNMAP = 0x1,
     /* Notify entry changes (newly created entries) */
     IOMMU_NOTIFIER_MAP = 0x2,
+    /* Notify changes on device IOTLB entries */
+    IOMMU_NOTIFIER_DEVIOTLB_UNMAP = 0x04,
 } IOMMUNotifierFlag;
 
-#define IOMMU_NOTIFIER_ALL (IOMMU_NOTIFIER_MAP | IOMMU_NOTIFIER_UNMAP)
+#define IOMMU_NOTIFIER_IOTLB_EVENTS (IOMMU_NOTIFIER_MAP | IOMMU_NOTIFIER_UNMAP)
+#define IOMMU_NOTIFIER_DEVIOTLB_EVENTS IOMMU_NOTIFIER_DEVIOTLB_UNMAP
+#define IOMMU_NOTIFIER_ALL (IOMMU_NOTIFIER_IOTLB_EVENTS | \
+                            IOMMU_NOTIFIER_DEVIOTLB_EVENTS)
 
 struct IOMMUNotifier;
 typedef void (*IOMMUNotify)(struct IOMMUNotifier *notifier,
diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
index 3976161317..6cc217742a 100644
--- a/hw/i386/intel_iommu.c
+++ b/hw/i386/intel_iommu.c
@@ -2468,7 +2468,7 @@ static bool vtd_process_device_iotlb_desc(IntelIOMMUState 
*s,
         sz = VTD_PAGE_SIZE;
     }
 
-    event.type = IOMMU_NOTIFIER_UNMAP;
+    event.type = IOMMU_NOTIFIER_DEVIOTLB_UNMAP;
     event.entry.target_as = &vtd_dev_as->as;
     event.entry.addr_mask = sz - 1;
     event.entry.iova = addr;
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 3077fa6ef5..6816037d6e 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -728,7 +728,7 @@ static void vhost_iommu_region_add(MemoryListener *listener,
     iommu_idx = memory_region_iommu_attrs_to_index(iommu_mr,
                                                    MEMTXATTRS_UNSPECIFIED);
     iommu_notifier_init(&iommu->n, vhost_iommu_unmap_notify,
-                        IOMMU_NOTIFIER_UNMAP,
+                        IOMMU_NOTIFIER_DEVIOTLB_UNMAP,
                         section->offset_within_region,
                         int128_get64(end),
                         iommu_idx);
-- 
2.18.1