qemu/virtio: virtio save/load bindings

Implement bindings for virtio save/load. Use them in virtio pci.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>

hw/virtio-pci.c

@@ -105,6 +105,46 @@ static void virtio_pci_notify(void *opaque, uint16_t vector)
         qemu_set_irq(proxy->pci_dev.irq[0], proxy->vdev->isr & 1);
 }
 
+static void virtio_pci_save_config(void * opaque, QEMUFile *f)
+{
+    VirtIOPCIProxy *proxy = opaque;
+    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)
+{
+    VirtIOPCIProxy *proxy = opaque;
+    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)
+{
+    VirtIOPCIProxy *proxy = opaque;
+    int ret;
+    ret = pci_device_load(&proxy->pci_dev, f);
+    if (ret)
+        return ret;
+    msix_load(&proxy->pci_dev, f);
+    if (msix_present(&proxy->pci_dev))
+        qemu_get_be16s(f, &proxy->vdev->config_vector);
+    return 0;
+}
+
+static int virtio_pci_load_queue(void * opaque, int n, QEMUFile *f)
+{
+    VirtIOPCIProxy *proxy = opaque;
+    uint16_t vector;
+    if (!msix_present(&proxy->pci_dev))
+        return 0;
+    qemu_get_be16s(f, &vector);
+    virtio_queue_set_vector(proxy->vdev, n, vector);
+    return 0;
+}
+
 static void virtio_pci_reset(void *opaque)
 {
     VirtIOPCIProxy *proxy = opaque;
@@ -319,7 +359,11 @@ static void virtio_write_config(PCIDevice *pci_dev, uint32_t address,
 }
 
 static const VirtIOBindings virtio_pci_bindings = {
-    .notify = virtio_pci_notify
+    .notify = virtio_pci_notify,
+    .save_config = virtio_pci_save_config,
+    .load_config = virtio_pci_load_config,
+    .save_queue = virtio_pci_save_queue,
+    .load_queue = virtio_pci_load_queue,
 };
 
 static void virtio_init_pci(VirtIOPCIProxy *proxy, VirtIODevice *vdev,

hw/virtio.c

@@ -616,9 +616,8 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
 {
     int i;
 
-    /* FIXME: load/save binding.  */
-    //pci_device_save(&vdev->pci_dev, f);
-    //msix_save(&vdev->pci_dev, f);
+    if (vdev->binding->save_config)
+        vdev->binding->save_config(vdev->binding_opaque, f);
 
     qemu_put_8s(f, &vdev->status);
     qemu_put_8s(f, &vdev->isr);
@@ -644,18 +643,20 @@ void virtio_save(VirtIODevice *vdev, QEMUFile *f)
         qemu_put_be32(f, vdev->vq[i].vring.num);
         qemu_put_be64(f, vdev->vq[i].pa);
         qemu_put_be16s(f, &vdev->vq[i].last_avail_idx);
-        if (vdev->nvectors)
-            qemu_put_be16s(f, &vdev->vq[i].vector);
+        if (vdev->binding->save_queue)
+            vdev->binding->save_queue(vdev->binding_opaque, i, f);
     }
 }
 
-void virtio_load(VirtIODevice *vdev, QEMUFile *f)
+int virtio_load(VirtIODevice *vdev, QEMUFile *f)
 {
-    int num, i;
+    int num, i, ret;
 
-    /* FIXME: load/save binding.  */
-    //pci_device_load(&vdev->pci_dev, f);
-    //r = msix_load(&vdev->pci_dev, f);
+    if (vdev->binding->load_config) {
+        ret = vdev->binding->load_config(vdev->binding_opaque, f);
+        if (ret)
+            return ret;
+    }
 
     qemu_get_8s(f, &vdev->status);
     qemu_get_8s(f, &vdev->isr);
@@ -664,10 +665,6 @@ void virtio_load(VirtIODevice *vdev, QEMUFile *f)
     vdev->config_len = qemu_get_be32(f);
     qemu_get_buffer(f, vdev->config, vdev->config_len);
 
-    if (vdev->nvectors) {
-        qemu_get_be16s(f, &vdev->config_vector);
-        //msix_vector_use(&vdev->pci_dev, vdev->config_vector);
-    }
     num = qemu_get_be32(f);
 
     for (i = 0; i < num; i++) {
@@ -678,13 +675,15 @@ void virtio_load(VirtIODevice *vdev, QEMUFile *f)
         if (vdev->vq[i].pa) {
             virtqueue_init(&vdev->vq[i]);
         }
-        if (vdev->nvectors) {
-            qemu_get_be16s(f, &vdev->vq[i].vector);
-            //msix_vector_use(&vdev->pci_dev, vdev->config_vector);
+        if (vdev->binding->load_queue) {
+            ret = vdev->binding->load_queue(vdev->binding_opaque, i, f);
+            if (ret)
+                return ret;
         }
     }
 
     virtio_notify_vector(vdev, VIRTIO_NO_VECTOR);
+    return 0;
 }
 
 void virtio_cleanup(VirtIODevice *vdev)

hw/virtio.h

@@ -76,6 +76,10 @@ typedef struct 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);
 } VirtIOBindings;
 
 #define VIRTIO_PCI_QUEUE_MAX 16