[Qemu-devel] [PATCH] virtio: make bindings typesafe

["Michael S. Tsirkin" <mst@redhat.com>]

Move bindings from opaque to DeviceState.
This gives us better type safety with no performance cost.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
---
 hw/s390-virtio-bus.c |  8 ++++----
 hw/virtio-pci.c      | 48 ++++++++++++++++++++++++------------------------
 hw/virtio.h          | 24 ++++++++++++------------
 3 files changed, 40 insertions(+), 40 deletions(-)

diff --git a/hw/s390-virtio-bus.c b/hw/s390-virtio-bus.c
index e0ac2d1..6c7c7e5 100644
--- a/hw/s390-virtio-bus.c
+++ b/hw/s390-virtio-bus.c
@@ -364,9 +364,9 @@ VirtIOS390Device *s390_virtio_bus_find_mem(VirtIOS390Bus *bus, ram_addr_t mem)
     return NULL;
 }
 
-static void virtio_s390_notify(void *opaque, uint16_t vector)
+static void virtio_s390_notify(DeviceState *d, uint16_t vector)
 {
-    VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
+    VirtIOS390Device *dev= container_of(d, VirtIOS390Device, qdev);
     uint64_t token = s390_virtio_device_vq_token(dev, vector);
     S390CPU *cpu = s390_cpu_addr2state(0);
     CPUS390XState *env = &cpu->env;
@@ -374,9 +374,9 @@ static void virtio_s390_notify(void *opaque, uint16_t vector)
     s390_virtio_irq(env, 0, token);
 }
 
-static unsigned virtio_s390_get_features(void *opaque)
+static unsigned virtio_s390_get_features(DeviceState *d)
 {
-    VirtIOS390Device *dev = (VirtIOS390Device*)opaque;
+    VirtIOS390Device *dev= container_of(d, VirtIOS390Device, qdev);
     return dev->host_features;
 }
 
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 3ea4140..63ae888 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -98,34 +98,34 @@ bool virtio_is_big_endian(void);
 
 /* virtio device */
 
-static void virtio_pci_notify(void *opaque, uint16_t vector)
+static void virtio_pci_notify(DeviceState *d, uint16_t vector)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     if (msix_enabled(&proxy->pci_dev))
         msix_notify(&proxy->pci_dev, vector);
     else
         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 }
 
-static void virtio_pci_save_config(void * opaque, QEMUFile *f)
+static void virtio_pci_save_config(DeviceState *d, QEMUFile *f)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     pci_device_save(&proxy->pci_dev, f);
     msix_save(&proxy->pci_dev, f);
     if (msix_present(&proxy->pci_dev))
         qemu_put_be16(f, proxy->vdev->config_vector);
 }
 
-static void virtio_pci_save_queue(void * opaque, int n, QEMUFile *f)
+static void virtio_pci_save_queue(DeviceState *d, int n, QEMUFile *f)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     if (msix_present(&proxy->pci_dev))
         qemu_put_be16(f, virtio_queue_vector(proxy->vdev, n));
 }
 
-static int virtio_pci_load_config(void * opaque, QEMUFile *f)
+static int virtio_pci_load_config(DeviceState *d, QEMUFile *f)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     int ret;
     ret = pci_device_load(&proxy->pci_dev, f);
     if (ret) {
@@ -144,9 +144,9 @@ static int virtio_pci_load_config(void * opaque, QEMUFile *f)
     return 0;
 }
 
-static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f)
+static int virtio_pci_load_queue(DeviceState *d, int n, QEMUFile *f)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     uint16_t vector;
     if (msix_present(&proxy->pci_dev)) {
         qemu_get_be16s(f, &vector);
@@ -464,9 +464,9 @@ static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
     }
 }
 
-static unsigned virtio_pci_get_features(void *opaque)
+static unsigned virtio_pci_get_features(DeviceState *d)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     return proxy->host_features;
 }
 
@@ -568,9 +568,9 @@ static void kvm_virtio_pci_vector_release(PCIDevice *dev, unsigned vector)
     }
 }
 
-static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
+static int virtio_pci_set_guest_notifier(DeviceState *d, int n, bool assign)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     VirtQueue *vq = virtio_get_queue(proxy->vdev, n);
     EventNotifier *notifier = virtio_queue_get_guest_notifier(vq);
 
@@ -588,15 +588,15 @@ static int virtio_pci_set_guest_notifier(void *opaque, int n, bool assign)
     return 0;
 }
 
-static bool virtio_pci_query_guest_notifiers(void *opaque)
+static bool virtio_pci_query_guest_notifiers(DeviceState *d)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     return msix_enabled(&proxy->pci_dev);
 }
 
-static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
+static int virtio_pci_set_guest_notifiers(DeviceState *d, bool assign)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
     VirtIODevice *vdev = proxy->vdev;
     int r, n;
 
@@ -612,7 +612,7 @@ static int virtio_pci_set_guest_notifiers(void *opaque, bool assign)
             break;
         }
 
-        r = virtio_pci_set_guest_notifier(opaque, n, assign);
+        r = virtio_pci_set_guest_notifier(d, n, assign);
         if (r < 0) {
             goto assign_error;
         }
@@ -638,14 +638,14 @@ assign_error:
     /* We get here on assignment failure. Recover by undoing for VQs 0 .. n. */
     assert(assign);
     while (--n >= 0) {
-        virtio_pci_set_guest_notifier(opaque, n, !assign);
+        virtio_pci_set_guest_notifier(d, n, !assign);
     }
     return r;
 }
 
-static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
+static int virtio_pci_set_host_notifier(DeviceState *d, int n, bool assign)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 
     /* Stop using ioeventfd for virtqueue kick if the device starts using host
      * notifiers.  This makes it easy to avoid stepping on each others' toes.
@@ -661,9 +661,9 @@ static int virtio_pci_set_host_notifier(void *opaque, int n, bool assign)
     return virtio_pci_set_host_notifier_internal(proxy, n, assign, false);
 }
 
-static void virtio_pci_vmstate_change(void *opaque, bool running)
+static void virtio_pci_vmstate_change(DeviceState *d, bool running)
 {
-    VirtIOPCIProxy *proxy = opaque;
+    VirtIOPCIProxy *proxy = container_of(d, VirtIOPCIProxy, pci_dev.qdev);
 
     if (running) {
         /* Try to find out if the guest has bus master disabled, but is
diff --git a/hw/virtio.h b/hw/virtio.h
index 7c17f7b..b9eeaa5 100644
--- a/hw/virtio.h
+++ b/hw/virtio.h
@@ -91,17 +91,17 @@ typedef struct VirtQueueElement
 } VirtQueueElement;
 
 typedef struct {
-    void (*notify)(void * opaque, uint16_t vector);
-    void (*save_config)(void * opaque, QEMUFile *f);
-    void (*save_queue)(void * opaque, int n, QEMUFile *f);
-    int (*load_config)(void * opaque, QEMUFile *f);
-    int (*load_queue)(void * opaque, int n, QEMUFile *f);
-    int (*load_done)(void * opaque, QEMUFile *f);
-    unsigned (*get_features)(void * opaque);
-    bool (*query_guest_notifiers)(void * opaque);
-    int (*set_guest_notifiers)(void * opaque, bool assigned);
-    int (*set_host_notifier)(void * opaque, int n, bool assigned);
-    void (*vmstate_change)(void * opaque, bool running);
+    void (*notify)(DeviceState *d, uint16_t vector);
+    void (*save_config)(DeviceState *d, QEMUFile *f);
+    void (*save_queue)(DeviceState *d, int n, QEMUFile *f);
+    int (*load_config)(DeviceState *d, QEMUFile *f);
+    int (*load_queue)(DeviceState *d, int n, QEMUFile *f);
+    int (*load_done)(DeviceState *d, QEMUFile *f);
+    unsigned (*get_features)(DeviceState *d);
+    bool (*query_guest_notifiers)(DeviceState *d);
+    int (*set_guest_notifiers)(DeviceState *d, bool assigned);
+    int (*set_host_notifier)(DeviceState *d, int n, bool assigned);
+    void (*vmstate_change)(DeviceState *d, bool running);
 } VirtIOBindings;
 
 #define VIRTIO_PCI_QUEUE_MAX 64
@@ -128,7 +128,7 @@ struct VirtIODevice
     void (*set_status)(VirtIODevice *vdev, uint8_t val);
     VirtQueue *vq;
     const VirtIOBindings *binding;
-    void *binding_opaque;
+    DeviceState *binding_opaque;
     uint16_t device_id;
     bool vm_running;
     VMChangeStateEntry *vmstate;
-- 
MST