From 148512e062ec99acb06bfb1d559d7254d84403f9 Mon Sep 17 00:00:00 2001
From: Emil Condrea <emilcondrea@gmail.com>
Date: Tue, 25 Oct 2016 08:50:12 +0300
Subject: [PATCH] xen: Prepare xendev qtail to be shared with frontends

 * move xendevs qtail to xen_pvdev.c
 * change xen_be_get_xendev to use a new function: xen_pv_insert_xendev

Signed-off-by: Emil Condrea <emilcondrea@gmail.com>
Signed-off-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Quan Xu <xuquan8@huawei.com>
Acked-by: Anthony PERARD <anthony.perard@citrix.com>
---
 hw/xen/xen_backend.c         | 51 +-------------------------------
 hw/xen/xen_pvdev.c           | 57 ++++++++++++++++++++++++++++++++++++
 include/hw/xen/xen_backend.h |  1 -
 include/hw/xen/xen_pvdev.h   |  4 +++
 4 files changed, 62 insertions(+), 51 deletions(-)

diff --git a/hw/xen/xen_backend.c b/hw/xen/xen_backend.c
index 1487db25ad..2875e7cd95 100644
--- a/hw/xen/xen_backend.c
+++ b/hw/xen/xen_backend.c
@@ -54,8 +54,6 @@ struct xs_dirs {
 static QTAILQ_HEAD(xs_dirs_head, xs_dirs) xs_cleanup =
     QTAILQ_HEAD_INITIALIZER(xs_cleanup);
 
-static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs =
-    QTAILQ_HEAD_INITIALIZER(xendevs);
 static int debug;
 
 static void xenstore_cleanup_dir(char *dir)
@@ -157,27 +155,6 @@ int xen_be_set_state(struct XenDevice *xendev, enum xenbus_state state)
     return 0;
 }
 
-/* ------------------------------------------------------------- */
-
-struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev)
-{
-    struct XenDevice *xendev;
-
-    QTAILQ_FOREACH(xendev, &xendevs, next) {
-        if (xendev->dom != dom) {
-            continue;
-        }
-        if (xendev->dev != dev) {
-            continue;
-        }
-        if (strcmp(xendev->type, type) != 0) {
-            continue;
-        }
-        return xendev;
-    }
-    return NULL;
-}
-
 /*
  * get xen backend device, allocate a new one if it doesn't exist.
  */
@@ -226,7 +203,7 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
         xendev->gnttabdev = NULL;
     }
 
-    QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
+    xen_pv_insert_xendev(xendev);
 
     if (xendev->ops->alloc) {
         xendev->ops->alloc(xendev);
@@ -235,32 +212,6 @@ static struct XenDevice *xen_be_get_xendev(const char *type, int dom, int dev,
     return xendev;
 }
 
-/*
- * release xen backend device.
- */
-static void xen_be_del_xendev(struct XenDevice *xendev)
-{
-    if (xendev->ops->free) {
-        xendev->ops->free(xendev);
-    }
-
-    if (xendev->fe) {
-        char token[XEN_BUFSIZE];
-        snprintf(token, sizeof(token), "fe:%p", xendev);
-        xs_unwatch(xenstore, xendev->fe, token);
-        g_free(xendev->fe);
-    }
-
-    if (xendev->evtchndev != NULL) {
-        xenevtchn_close(xendev->evtchndev);
-    }
-    if (xendev->gnttabdev != NULL) {
-        xengnttab_close(xendev->gnttabdev);
-    }
-
-    QTAILQ_REMOVE(&xendevs, xendev, next);
-    g_free(xendev);
-}
 
 /*
  * Sync internal data structures on xenstore updates.
diff --git a/hw/xen/xen_pvdev.c b/hw/xen/xen_pvdev.c
index 7607e44c9a..96ed2a3c80 100644
--- a/hw/xen/xen_pvdev.c
+++ b/hw/xen/xen_pvdev.c
@@ -22,7 +22,11 @@
 #include "hw/xen/xen_backend.h"
 #include "hw/xen/xen_pvdev.h"
 
+/* private */
 static int debug;
+static QTAILQ_HEAD(XenDeviceHead, XenDevice) xendevs =
+    QTAILQ_HEAD_INITIALIZER(xendevs);
+
 /* ------------------------------------------------------------- */
 
 int xenstore_write_str(const char *base, const char *node, const char *val)
@@ -206,3 +210,56 @@ int xen_be_send_notify(struct XenDevice *xendev)
 {
     return xenevtchn_notify(xendev->evtchndev, xendev->local_port);
 }
+
+/* ------------------------------------------------------------- */
+
+struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev)
+{
+    struct XenDevice *xendev;
+
+    QTAILQ_FOREACH(xendev, &xendevs, next) {
+        if (xendev->dom != dom) {
+            continue;
+        }
+        if (xendev->dev != dev) {
+            continue;
+        }
+        if (strcmp(xendev->type, type) != 0) {
+            continue;
+        }
+        return xendev;
+    }
+    return NULL;
+}
+
+/*
+ * release xen backend device.
+ */
+void xen_be_del_xendev(struct XenDevice *xendev)
+{
+    if (xendev->ops->free) {
+        xendev->ops->free(xendev);
+    }
+
+    if (xendev->fe) {
+        char token[XEN_BUFSIZE];
+        snprintf(token, sizeof(token), "fe:%p", xendev);
+        xs_unwatch(xenstore, xendev->fe, token);
+        g_free(xendev->fe);
+    }
+
+    if (xendev->evtchndev != NULL) {
+        xenevtchn_close(xendev->evtchndev);
+    }
+    if (xendev->gnttabdev != NULL) {
+        xengnttab_close(xendev->gnttabdev);
+    }
+
+    QTAILQ_REMOVE(&xendevs, xendev, next);
+    g_free(xendev);
+}
+
+void xen_pv_insert_xendev(struct XenDevice *xendev)
+{
+    QTAILQ_INSERT_TAIL(&xendevs, xendev, next);
+}
diff --git a/include/hw/xen/xen_backend.h b/include/hw/xen/xen_backend.h
index 6c617d98ce..cbda40ee53 100644
--- a/include/hw/xen/xen_backend.h
+++ b/include/hw/xen/xen_backend.h
@@ -27,7 +27,6 @@ int xenstore_read_fe_int(struct XenDevice *xendev, const char *node, int *ival);
 int xenstore_read_fe_uint64(struct XenDevice *xendev, const char *node,
                             uint64_t *uval);
 
-struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev);
 void xen_be_check_state(struct XenDevice *xendev);
 
 /* xen backend driver bits */
diff --git a/include/hw/xen/xen_pvdev.h b/include/hw/xen/xen_pvdev.h
index a8da3da0b0..517537ae8a 100644
--- a/include/hw/xen/xen_pvdev.h
+++ b/include/hw/xen/xen_pvdev.h
@@ -65,6 +65,10 @@ void xenstore_update(void *unused);
 const char *xenbus_strstate(enum xenbus_state state);
 
 void xen_be_evtchn_event(void *opaque);
+void xen_pv_insert_xendev(struct XenDevice *xendev);
+void xen_be_del_xendev(struct XenDevice *xendev);
+struct XenDevice *xen_be_find_xendev(const char *type, int dom, int dev);
+
 void xen_be_unbind_evtchn(struct XenDevice *xendev);
 int xen_be_send_notify(struct XenDevice *xendev);