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-rw-r--r--include/hw/acpi/vmgenid.h2
-rw-r--r--include/hw/compat.h4
-rw-r--r--include/sysemu/block-backend.h8
3 files changed, 14 insertions, 0 deletions
diff --git a/include/hw/acpi/vmgenid.h b/include/hw/acpi/vmgenid.h
index db7fa0e633..7beb9592fb 100644
--- a/include/hw/acpi/vmgenid.h
+++ b/include/hw/acpi/vmgenid.h
@@ -21,8 +21,10 @@ typedef struct VmGenIdState {
     DeviceClass parent_obj;
     QemuUUID guid;                /* The 128-bit GUID seen by the guest */
     uint8_t vmgenid_addr_le[8];   /* Address of the GUID (little-endian) */
+    bool write_pointer_available;
 } VmGenIdState;
 
+/* returns NULL unless there is exactly one device */
 static inline Object *find_vmgenid_dev(void)
 {
     return object_resolve_path_type("", VMGENID_DEVICE, NULL);
diff --git a/include/hw/compat.h b/include/hw/compat.h
index fc8c3e0600..5d5be91daf 100644
--- a/include/hw/compat.h
+++ b/include/hw/compat.h
@@ -131,6 +131,10 @@
         .driver   = "fw_cfg_io",\
         .property = "dma_enabled",\
         .value    = "off",\
+    },{\
+        .driver   = "vmgenid",\
+        .property = "x-write-pointer-available",\
+        .value    = "off",\
     },
 
 #define HW_COMPAT_2_3 \
diff --git a/include/sysemu/block-backend.h b/include/sysemu/block-backend.h
index 096c17fce0..7462228ac1 100644
--- a/include/sysemu/block-backend.h
+++ b/include/sysemu/block-backend.h
@@ -58,6 +58,14 @@ typedef struct BlockDevOps {
      * Runs when the size changed (e.g. monitor command block_resize)
      */
     void (*resize_cb)(void *opaque);
+    /*
+     * Runs when the backend receives a drain request.
+     */
+    void (*drained_begin)(void *opaque);
+    /*
+     * Runs when the backend's last drain request ends.
+     */
+    void (*drained_end)(void *opaque);
 } BlockDevOps;
 
 /* This struct is embedded in (the private) BlockBackend struct and contains