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-rw-r--r--hw/core/clock-vmstate.c40
-rw-r--r--hw/core/clock.c31
-rw-r--r--hw/core/machine.c3
-rw-r--r--hw/core/qdev-properties-system.c43
-rw-r--r--hw/core/qdev-properties.c6
-rw-r--r--hw/core/trace-events1
6 files changed, 104 insertions, 20 deletions
diff --git a/hw/core/clock-vmstate.c b/hw/core/clock-vmstate.c
index 260b13fc2c..9d9174ffbd 100644
--- a/hw/core/clock-vmstate.c
+++ b/hw/core/clock-vmstate.c
@@ -14,12 +14,50 @@
 #include "migration/vmstate.h"
 #include "hw/clock.h"
 
+static bool muldiv_needed(void *opaque)
+{
+    Clock *clk = opaque;
+
+    return clk->multiplier != 1 || clk->divider != 1;
+}
+
+static int clock_pre_load(void *opaque)
+{
+    Clock *clk = opaque;
+    /*
+     * The initial out-of-reset settings of the Clock might have been
+     * configured by the device to be different from what we set
+     * in clock_initfn(), so we must here set the default values to
+     * be used if they are not in the inbound migration state.
+     */
+    clk->multiplier = 1;
+    clk->divider = 1;
+
+    return 0;
+}
+
+const VMStateDescription vmstate_muldiv = {
+    .name = "clock/muldiv",
+    .version_id = 1,
+    .minimum_version_id = 1,
+    .needed = muldiv_needed,
+    .fields = (VMStateField[]) {
+        VMSTATE_UINT32(multiplier, Clock),
+        VMSTATE_UINT32(divider, Clock),
+    },
+};
+
 const VMStateDescription vmstate_clock = {
     .name = "clock",
     .version_id = 0,
     .minimum_version_id = 0,
+    .pre_load = clock_pre_load,
     .fields = (VMStateField[]) {
         VMSTATE_UINT64(period, Clock),
         VMSTATE_END_OF_LIST()
-    }
+    },
+    .subsections = (const VMStateDescription*[]) {
+        &vmstate_muldiv,
+        NULL
+    },
 };
diff --git a/hw/core/clock.c b/hw/core/clock.c
index fc5a99683f..916875e07a 100644
--- a/hw/core/clock.c
+++ b/hw/core/clock.c
@@ -64,6 +64,15 @@ bool clock_set(Clock *clk, uint64_t period)
     return true;
 }
 
+static uint64_t clock_get_child_period(Clock *clk)
+{
+    /*
+     * Return the period to be used for child clocks, which is the parent
+     * clock period adjusted for for multiplier and divider effects.
+     */
+    return muldiv64(clk->period, clk->multiplier, clk->divider);
+}
+
 static void clock_call_callback(Clock *clk, ClockEvent event)
 {
     /*
@@ -78,15 +87,16 @@ static void clock_call_callback(Clock *clk, ClockEvent event)
 static void clock_propagate_period(Clock *clk, bool call_callbacks)
 {
     Clock *child;
+    uint64_t child_period = clock_get_child_period(clk);
 
     QLIST_FOREACH(child, &clk->children, sibling) {
-        if (child->period != clk->period) {
+        if (child->period != child_period) {
             if (call_callbacks) {
                 clock_call_callback(child, ClockPreUpdate);
             }
-            child->period = clk->period;
+            child->period = child_period;
             trace_clock_update(CLOCK_PATH(child), CLOCK_PATH(clk),
-                               CLOCK_PERIOD_TO_HZ(clk->period),
+                               CLOCK_PERIOD_TO_HZ(child->period),
                                call_callbacks);
             if (call_callbacks) {
                 clock_call_callback(child, ClockUpdate);
@@ -110,7 +120,7 @@ void clock_set_source(Clock *clk, Clock *src)
 
     trace_clock_set_source(CLOCK_PATH(clk), CLOCK_PATH(src));
 
-    clk->period = src->period;
+    clk->period = clock_get_child_period(src);
     QLIST_INSERT_HEAD(&src->children, clk, sibling);
     clk->source = src;
     clock_propagate_period(clk, false);
@@ -133,10 +143,23 @@ char *clock_display_freq(Clock *clk)
     return freq_to_str(clock_get_hz(clk));
 }
 
+void clock_set_mul_div(Clock *clk, uint32_t multiplier, uint32_t divider)
+{
+    assert(divider != 0);
+
+    trace_clock_set_mul_div(CLOCK_PATH(clk), clk->multiplier, multiplier,
+                            clk->divider, divider);
+    clk->multiplier = multiplier;
+    clk->divider = divider;
+}
+
 static void clock_initfn(Object *obj)
 {
     Clock *clk = CLOCK(obj);
 
+    clk->multiplier = 1;
+    clk->divider = 1;
+
     QLIST_INIT(&clk->children);
 }
 
diff --git a/hw/core/machine.c b/hw/core/machine.c
index 54e040587d..067f42b528 100644
--- a/hw/core/machine.c
+++ b/hw/core/machine.c
@@ -37,6 +37,9 @@
 #include "hw/virtio/virtio.h"
 #include "hw/virtio/virtio-pci.h"
 
+GlobalProperty hw_compat_6_1[] = {};
+const size_t hw_compat_6_1_len = G_N_ELEMENTS(hw_compat_6_1);
+
 GlobalProperty hw_compat_6_0[] = {
     { "gpex-pcihost", "allow-unmapped-accesses", "false" },
     { "i8042", "extended-state", "false"},
diff --git a/hw/core/qdev-properties-system.c b/hw/core/qdev-properties-system.c
index 2760c21f11..e71f5d64d1 100644
--- a/hw/core/qdev-properties-system.c
+++ b/hw/core/qdev-properties-system.c
@@ -36,11 +36,11 @@
 
 static bool check_prop_still_unset(Object *obj, const char *name,
                                    const void *old_val, const char *new_val,
-                                   Error **errp)
+                                   bool allow_override, Error **errp)
 {
     const GlobalProperty *prop = qdev_find_global_prop(obj, name);
 
-    if (!old_val) {
+    if (!old_val || (!prop && allow_override)) {
         return true;
     }
 
@@ -93,16 +93,34 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
     BlockBackend *blk;
     bool blk_created = false;
     int ret;
+    BlockDriverState *bs;
+    AioContext *ctx;
 
     if (!visit_type_str(v, name, &str, errp)) {
         return;
     }
 
-    /*
-     * TODO Should this really be an error?  If no, the old value
-     * needs to be released before we store the new one.
-     */
-    if (!check_prop_still_unset(obj, name, *ptr, str, errp)) {
+    if (!check_prop_still_unset(obj, name, *ptr, str, true, errp)) {
+        return;
+    }
+
+    if (*ptr) {
+        /* BlockBackend alread exists. So, we want to change attached node */
+        blk = *ptr;
+        ctx = blk_get_aio_context(blk);
+        bs = bdrv_lookup_bs(NULL, str, errp);
+        if (!bs) {
+            return;
+        }
+
+        if (ctx != bdrv_get_aio_context(bs)) {
+            error_setg(errp, "Different aio context is not supported for new "
+                       "node");
+        }
+
+        aio_context_acquire(ctx);
+        blk_replace_bs(blk, bs, errp);
+        aio_context_release(ctx);
         return;
     }
 
@@ -114,7 +132,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
 
     blk = blk_by_name(str);
     if (!blk) {
-        BlockDriverState *bs = bdrv_lookup_bs(NULL, str, NULL);
+        bs = bdrv_lookup_bs(NULL, str, NULL);
         if (bs) {
             /*
              * If the device supports iothreads, it will make sure to move the
@@ -123,8 +141,7 @@ static void set_drive_helper(Object *obj, Visitor *v, const char *name,
              * aware of iothreads require their BlockBackends to be in the main
              * AioContext.
              */
-            AioContext *ctx = iothread ? bdrv_get_aio_context(bs) :
-                                         qemu_get_aio_context();
+            ctx = iothread ? bdrv_get_aio_context(bs) : qemu_get_aio_context();
             blk = blk_new(ctx, 0, BLK_PERM_ALL);
             blk_created = true;
 
@@ -196,6 +213,7 @@ static void release_drive(Object *obj, const char *name, void *opaque)
 const PropertyInfo qdev_prop_drive = {
     .name  = "str",
     .description = "Node name or ID of a block device to use as a backend",
+    .realized_set_allowed = true,
     .get   = get_drive,
     .set   = set_drive,
     .release = release_drive,
@@ -204,6 +222,7 @@ const PropertyInfo qdev_prop_drive = {
 const PropertyInfo qdev_prop_drive_iothread = {
     .name  = "str",
     .description = "Node name or ID of a block device to use as a backend",
+    .realized_set_allowed = true,
     .get   = get_drive,
     .set   = set_drive_iothread,
     .release = release_drive,
@@ -238,7 +257,7 @@ static void set_chr(Object *obj, Visitor *v, const char *name, void *opaque,
      * TODO Should this really be an error?  If no, the old value
      * needs to be released before we store the new one.
      */
-    if (!check_prop_still_unset(obj, name, be->chr, str, errp)) {
+    if (!check_prop_still_unset(obj, name, be->chr, str, false, errp)) {
         return;
     }
 
@@ -408,7 +427,7 @@ static void set_netdev(Object *obj, Visitor *v, const char *name,
          * TODO Should this really be an error?  If no, the old value
          * needs to be released before we store the new one.
          */
-        if (!check_prop_still_unset(obj, name, ncs[i], str, errp)) {
+        if (!check_prop_still_unset(obj, name, ncs[i], str, false, errp)) {
             goto out;
         }
 
diff --git a/hw/core/qdev-properties.c b/hw/core/qdev-properties.c
index 50f40949f5..c34aac6ebc 100644
--- a/hw/core/qdev-properties.c
+++ b/hw/core/qdev-properties.c
@@ -26,11 +26,11 @@ void qdev_prop_set_after_realize(DeviceState *dev, const char *name,
 
 /* returns: true if property is allowed to be set, false otherwise */
 static bool qdev_prop_allow_set(Object *obj, const char *name,
-                                Error **errp)
+                                const PropertyInfo *info, Error **errp)
 {
     DeviceState *dev = DEVICE(obj);
 
-    if (dev->realized) {
+    if (dev->realized && !info->realized_set_allowed) {
         qdev_prop_set_after_realize(dev, name, errp);
         return false;
     }
@@ -79,7 +79,7 @@ static void field_prop_set(Object *obj, Visitor *v, const char *name,
 {
     Property *prop = opaque;
 
-    if (!qdev_prop_allow_set(obj, name, errp)) {
+    if (!qdev_prop_allow_set(obj, name, prop->info, errp)) {
         return;
     }
 
diff --git a/hw/core/trace-events b/hw/core/trace-events
index 360ddeb2c8..9b3ecce3b2 100644
--- a/hw/core/trace-events
+++ b/hw/core/trace-events
@@ -34,3 +34,4 @@ clock_disconnect(const char *clk) "'%s'"
 clock_set(const char *clk, uint64_t old, uint64_t new) "'%s', %"PRIu64"Hz->%"PRIu64"Hz"
 clock_propagate(const char *clk) "'%s'"
 clock_update(const char *clk, const char *src, uint64_t hz, int cb) "'%s', src='%s', val=%"PRIu64"Hz cb=%d"
+clock_set_mul_div(const char *clk, uint32_t oldmul, uint32_t mul, uint32_t olddiv, uint32_t div) "'%s', mul: %u -> %u, div: %u -> %u"