[Qemu-devel] [PATCH 2/2] mem: highlight the listener's priority as enum

[Liu Ping Fan <qemulist@gmail.com>]

From: Liu Ping Fan <pingfank@linux.vnet.ibm.com>

It will make the priority prominent, when new listener added.
All the priority's value are kept unchanged, except for vhost
and hostmem.(Changes introduced by prev patch)

Signed-off-by: Liu Ping Fan <pingfank@linux.vnet.ibm.com>
---
 exec.c                        |    4 ++--
 hw/virtio/dataplane/hostmem.c |    2 +-
 hw/virtio/vhost.c             |    2 +-
 include/exec/memory.h         |   12 +++++++++++-
 kvm-all.c                     |    4 ++--
 xen-all.c                     |    2 +-
 6 files changed, 18 insertions(+), 8 deletions(-)

diff --git a/exec.c b/exec.c
index 19725db..aef0349 100644
--- a/exec.c
+++ b/exec.c
@@ -1766,13 +1766,13 @@ static MemoryListener core_memory_listener = {
     .begin = core_begin,
     .log_global_start = core_log_global_start,
     .log_global_stop = core_log_global_stop,
-    .priority = 1,
+    .priority = PRI_CORE,
 };
 
 static MemoryListener io_memory_listener = {
     .region_add = io_region_add,
     .region_del = io_region_del,
-    .priority = 0,
+    .priority = PRI_DEFAULT,
 };
 
 static MemoryListener tcg_memory_listener = {
diff --git a/hw/virtio/dataplane/hostmem.c b/hw/virtio/dataplane/hostmem.c
index 67cbce1..6be182c 100644
--- a/hw/virtio/dataplane/hostmem.c
+++ b/hw/virtio/dataplane/hostmem.c
@@ -158,7 +158,7 @@ void hostmem_init(HostMem *hostmem)
         .eventfd_del = hostmem_listener_eventfd_dummy,
         .coalesced_mmio_add = hostmem_listener_coalesced_mmio_dummy,
         .coalesced_mmio_del = hostmem_listener_coalesced_mmio_dummy,
-        .priority = 9,
+        .priority = PRI_VRING,
     };
 
     memory_listener_register(&hostmem->listener, &address_space_memory);
diff --git a/hw/virtio/vhost.c b/hw/virtio/vhost.c
index 91c313b..df6d8c5 100644
--- a/hw/virtio/vhost.c
+++ b/hw/virtio/vhost.c
@@ -856,7 +856,7 @@ int vhost_dev_init(struct vhost_dev *hdev, int devfd, const char *devpath,
         .log_global_stop = vhost_log_global_stop,
         .eventfd_add = vhost_eventfd_add,
         .eventfd_del = vhost_eventfd_del,
-        .priority = 9
+        .priority = PRI_VRING
     };
     hdev->mem = g_malloc0(offsetof(struct vhost_memory, regions));
     hdev->n_mem_sections = 0;
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 9e88320..77e0d40 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -192,6 +192,16 @@ struct MemoryRegionSection {
 
 typedef struct MemoryListener MemoryListener;
 
+/* The list of priority, ex, vhost should have higher priority (less num) than
+ * kvm, ie PRI_VRING < PRI_HYPV
+ */
+typedef enum {
+    PRI_DEFAULT = 0,
+    PRI_CORE = 1,
+    PRI_VRING = 9,
+    PRI_HYPERV = 10,
+} MemListenerPriority;
+
 /**
  * MemoryListener: callbacks structure for updates to the physical memory map
  *
@@ -218,7 +228,7 @@ struct MemoryListener {
     void (*coalesced_mmio_del)(MemoryListener *listener, MemoryRegionSection *section,
                                hwaddr addr, hwaddr len);
     /* Lower = earlier (during add), later (during del) */
-    unsigned priority;
+    MemListenerPriority priority;
     AddressSpace *address_space_filter;
     QTAILQ_ENTRY(MemoryListener) link;
 };
diff --git a/kvm-all.c b/kvm-all.c
index 3a31602..2794dee 100644
--- a/kvm-all.c
+++ b/kvm-all.c
@@ -875,13 +875,13 @@ static MemoryListener kvm_memory_listener = {
     .eventfd_del = kvm_mem_ioeventfd_del,
     .coalesced_mmio_add = kvm_coalesce_mmio_region,
     .coalesced_mmio_del = kvm_uncoalesce_mmio_region,
-    .priority = 10,
+    .priority = PRI_HYPERV,
 };
 
 static MemoryListener kvm_io_listener = {
     .eventfd_add = kvm_io_ioeventfd_add,
     .eventfd_del = kvm_io_ioeventfd_del,
-    .priority = 10,
+    .priority = PRI_HYPERV,
 };
 
 static void kvm_handle_interrupt(CPUState *cpu, int mask)
diff --git a/xen-all.c b/xen-all.c
index 539a154..7062420 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -562,7 +562,7 @@ static MemoryListener xen_memory_listener = {
     .log_sync = xen_log_sync,
     .log_global_start = xen_log_global_start,
     .log_global_stop = xen_log_global_stop,
-    .priority = 10,
+    .priority = PRI_HYPERV,
 };
 
 void qmp_xen_set_global_dirty_log(bool enable, Error **errp)
-- 
1.7.4.4