[Qemu-devel] [PATCH 04/13] msix: convert save/load to visitors (including interfaces)

[Michael Roth <mdroth@linux.vnet.ibm.com>]

Use visitors for serialization.

Also, with the only 2 direct users, virtio-pci and ivshmem, converted
to visitors, we can change msix save/load function to take a Visitor
directly, along with an Error object.

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
---
 hw/ivshmem.c    |    4 ++--
 hw/msix.c       |   37 ++++++++++++++++++++++++++++---------
 hw/msix.h       |    4 ++--
 hw/virtio-pci.c |    4 ++--
 4 files changed, 34 insertions(+), 15 deletions(-)

diff --git a/hw/ivshmem.c b/hw/ivshmem.c
index 48e27f5..8d0607d 100644
--- a/hw/ivshmem.c
+++ b/hw/ivshmem.c
@@ -573,7 +573,7 @@ static void ivshmem_save(QEMUFile* f, void *opaque)
     pci_device_save(&proxy->dev, f);
 
     if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
-        msix_save(&proxy->dev, f);
+        msix_save(&proxy->dev, v, &err);
     } else {
         visit_type_uint32(v, &proxy->intrstatus, "proxy.intrstatus", &err);
         visit_type_uint32(v, &proxy->intrmask, "proxy.intrmask", &err);
@@ -615,7 +615,7 @@ static int ivshmem_load(QEMUFile* f, void *opaque, int version_id)
     }
 
     if (ivshmem_has_feature(proxy, IVSHMEM_MSI)) {
-        msix_load(&proxy->dev, f);
+        msix_load(&proxy->dev, v, &err);
         for (i = 0; i < proxy->vectors; i++) {
             msix_vector_use(&proxy->dev, i);
         }
diff --git a/hw/msix.c b/hw/msix.c
index b15bafc..c62eeaa 100644
--- a/hw/msix.c
+++ b/hw/msix.c
@@ -276,30 +276,49 @@ int msix_uninit(PCIDevice *dev, MemoryRegion *bar)
     return 0;
 }
 
-void msix_save(PCIDevice *dev, QEMUFile *f)
+static void msix_visit(Visitor *v, PCIDevice *dev, Error **errp)
 {
     unsigned n = dev->msix_entries_nr;
+    int i;
+    Error *err = NULL;
 
+    visit_start_struct(v, NULL, NULL, "msix", 0, &err);
+
+    visit_start_array(v, NULL, "msix_table_page", n * PCI_MSIX_ENTRY_SIZE, 1,
+                      &err);
+    for (i = 0; i < n * PCI_MSIX_ENTRY_SIZE; i++) {
+        visit_type_uint8(v, &dev->msix_table_page[i], NULL, &err);
+    }
+    visit_end_array(v, &err);
+
+    visit_start_array(v, NULL, "msix_table_page_pending", (n + 7) / 8, 1, &err);
+    for (i = 0; i < (n + 7) / 8; i++) {
+        visit_type_uint8(v, &dev->msix_table_page[i + MSIX_PAGE_PENDING],
+                         NULL, &err);
+    }
+    visit_end_array(v, &err);
+
+    visit_end_struct(v, &err);
+    error_propagate(errp, err);
+}
+
+void msix_save(PCIDevice *dev, Visitor *v, Error **errp)
+{
     if (!(dev->cap_present & QEMU_PCI_CAP_MSIX)) {
         return;
     }
-
-    qemu_put_buffer(f, dev->msix_table_page, n * PCI_MSIX_ENTRY_SIZE);
-    qemu_put_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8);
+    msix_visit(v, dev, errp);
 }
 
 /* Should be called after restoring the config space. */
-void msix_load(PCIDevice *dev, QEMUFile *f)
+void msix_load(PCIDevice *dev, Visitor *v, Error **errp)
 {
-    unsigned n = dev->msix_entries_nr;
-
     if (!(dev->cap_present & QEMU_PCI_CAP_MSIX)) {
         return;
     }
 
     msix_free_irq_entries(dev);
-    qemu_get_buffer(f, dev->msix_table_page, n * PCI_MSIX_ENTRY_SIZE);
-    qemu_get_buffer(f, dev->msix_table_page + MSIX_PAGE_PENDING, (n + 7) / 8);
+    msix_visit(v, dev, errp);
 }
 
 /* Does device support MSI-X? */
diff --git a/hw/msix.h b/hw/msix.h
index 7e04336..e60ab10 100644
--- a/hw/msix.h
+++ b/hw/msix.h
@@ -13,8 +13,8 @@ void msix_write_config(PCIDevice *pci_dev, uint32_t address,
 
 int msix_uninit(PCIDevice *d, MemoryRegion *bar);
 
-void msix_save(PCIDevice *dev, QEMUFile *f);
-void msix_load(PCIDevice *dev, QEMUFile *f);
+void msix_save(PCIDevice *dev, Visitor *v, Error **errp);
+void msix_load(PCIDevice *dev, Visitor *v, Error **errp);
 
 int msix_enabled(PCIDevice *dev);
 int msix_present(PCIDevice *dev);
diff --git a/hw/virtio-pci.c b/hw/virtio-pci.c
index 9092c02..ca9cabc 100644
--- a/hw/virtio-pci.c
+++ b/hw/virtio-pci.c
@@ -107,7 +107,7 @@ static void virtio_pci_save_config(void * opaque, QEMUFile *f)
     Error *err = NULL;
 
     pci_device_save(&proxy->pci_dev, f);
-    msix_save(&proxy->pci_dev, f);
+    msix_save(&proxy->pci_dev, v, &err);
     if (msix_present(&proxy->pci_dev)) {
         visit_type_uint16(v, &proxy->vdev->config_vector,
                           "proxy.vdev.config_vector", &err);
@@ -148,7 +148,7 @@ static int virtio_pci_load_config(void * opaque, QEMUFile *f)
     if (ret) {
         goto out;
     }
-    msix_load(&proxy->pci_dev, f);
+    msix_load(&proxy->pci_dev, v, &err);
     if (msix_present(&proxy->pci_dev)) {
         visit_type_uint16(v, &proxy->vdev->config_vector,
                           "proxy.vdev.config_vector", &err);
-- 
1.7.4.1