[Qemu-devel] [PATCH qemu v13 09/16] vfio: Generalize IOMMU memory listener

[Alexey Kardashevskiy <aik@ozlabs.ru>]

At the moment VFIOContainer uses one memory listener which listens on
PCI address space for both Type1 and sPAPR IOMMUs. Soon we will need
another listener to listen on RAM; this will do DMA memory
pre-registration for sPAPR guests which basically pins all guest
pages in the host physical RAM.

This introduces VFIOMemoryListener which is wrapper for MemoryListener
and stores a pointer to the container. This allows having multiple
memory listeners for the same container. This replaces the existing
@listener with @iommu_listener.

This should cause no change in behavior.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
---
 hw/vfio/common.c              | 41 +++++++++++++++++++++++++++++++----------
 include/hw/vfio/vfio-common.h |  9 ++++++++-
 2 files changed, 39 insertions(+), 11 deletions(-)

diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index ca3fd47..0e67a5a 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -318,10 +318,10 @@ static hwaddr vfio_container_granularity(VFIOContainer *container)
     return (hwaddr)1 << ctz64(container->iova_pgsizes);
 }
 
-static void vfio_listener_region_add(MemoryListener *listener,
+static void vfio_listener_region_add(VFIOMemoryListener *vlistener,
                                      MemoryRegionSection *section)
 {
-    VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+    VFIOContainer *container = vlistener->container;
     hwaddr iova, end;
     Int128 llend;
     void *vaddr;
@@ -425,10 +425,10 @@ fail:
     }
 }
 
-static void vfio_listener_region_del(MemoryListener *listener,
+static void vfio_listener_region_del(VFIOMemoryListener *vlistener,
                                      MemoryRegionSection *section)
 {
-    VFIOContainer *container = container_of(listener, VFIOContainer, listener);
+    VFIOContainer *container = vlistener->container;
     hwaddr iova, end;
     int ret;
     MemoryRegion *iommu = NULL;
@@ -492,14 +492,33 @@ static void vfio_listener_region_del(MemoryListener *listener,
     }
 }
 
-static const MemoryListener vfio_memory_listener = {
-    .region_add = vfio_listener_region_add,
-    .region_del = vfio_listener_region_del,
+static void vfio_iommu_listener_region_add(MemoryListener *listener,
+                                           MemoryRegionSection *section)
+{
+    VFIOMemoryListener *vlistener = container_of(listener, VFIOMemoryListener,
+                                                 listener);
+
+    vfio_listener_region_add(vlistener, section);
+}
+
+
+static void vfio_iommu_listener_region_del(MemoryListener *listener,
+                                           MemoryRegionSection *section)
+{
+    VFIOMemoryListener *vlistener = container_of(listener, VFIOMemoryListener,
+                                                 listener);
+
+    vfio_listener_region_del(vlistener, section);
+}
+
+static const MemoryListener vfio_iommu_listener = {
+    .region_add = vfio_iommu_listener_region_add,
+    .region_del = vfio_iommu_listener_region_del,
 };
 
 static void vfio_listener_release(VFIOContainer *container)
 {
-    memory_listener_unregister(&container->listener);
+    memory_listener_unregister(&container->iommu_listener.listener);
 }
 
 int vfio_mmap_region(Object *obj, VFIORegion *region,
@@ -768,9 +787,11 @@ static int vfio_connect_container(VFIOGroup *group, AddressSpace *as)
         goto free_container_exit;
     }
 
-    container->listener = vfio_memory_listener;
+    container->iommu_listener.container = container;
+    container->iommu_listener.listener = vfio_iommu_listener;
 
-    memory_listener_register(&container->listener, container->space->as);
+    memory_listener_register(&container->iommu_listener.listener,
+                             container->space->as);
 
     if (container->error) {
         ret = container->error;
diff --git a/include/hw/vfio/vfio-common.h b/include/hw/vfio/vfio-common.h
index 9ffa681..b6b736c 100644
--- a/include/hw/vfio/vfio-common.h
+++ b/include/hw/vfio/vfio-common.h
@@ -57,12 +57,19 @@ typedef struct VFIOAddressSpace {
     QLIST_ENTRY(VFIOAddressSpace) list;
 } VFIOAddressSpace;
 
+typedef struct VFIOContainer VFIOContainer;
+
+typedef struct VFIOMemoryListener {
+    struct MemoryListener listener;
+    VFIOContainer *container;
+} VFIOMemoryListener;
+
 struct VFIOGroup;
 
 typedef struct VFIOContainer {
     VFIOAddressSpace *space;
     int fd; /* /dev/vfio/vfio, empowered by the attached groups */
-    MemoryListener listener;
+    VFIOMemoryListener iommu_listener;
     int error;
     bool initialized;
     /*
-- 
2.5.0.rc3