[PATCH 2/7] qemu: Introduce qemuCheckBootIndex and qemuChangeDiskBootIndex API

[Jiang Jiacheng]

Introduce qemuCheckBootIndex to check the new bootindex and is it nessary
to update the bootindex. Introduce qemuChangeDiskBootIndex to support update
disk's bootindex according to different disks' type.

Signed-off-by: Jiang Jiacheng <jiangjiacheng at huawei.com>
---
 src/qemu/qemu_conf.c | 45 ++++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_conf.h |  7 +++++++
 2 files changed, 52 insertions(+)

diff --git a/src/qemu/qemu_conf.c b/src/qemu/qemu_conf.c
index b653f44f25..3255632254 100644
--- a/src/qemu/qemu_conf.c
+++ b/src/qemu/qemu_conf.c
@@ -1595,3 +1595,48 @@ qemuDomainChangeBootIndex(virDomainObj *vm,
 
     return ret;
 }
+
+int
+qemuCheckBootIndex(const int orig_bootindex,
+                   const int new_bootindex)
+{
+    if ((new_bootindex == -1) && ((orig_bootindex == 0) || (orig_bootindex == -1))) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED,
+                       _("this device does not set boot index, cannot cancel it."));
+        return -1;
+    }
+
+    /* if the new bootindex is different from the old bootindex and not
+     * equal to 0, we will update the old bootindex.
+     */
+    if (new_bootindex && (orig_bootindex != new_bootindex)) {
+        return 1;
+    }
+
+    return 0;
+}
+
+int
+qemuChangeDiskBootIndex(virDomainObj *vm,
+                        virDomainDiskDef *orig_disk,
+                        virDomainDiskDef *disk)
+{
+    switch (disk->device) {
+    case VIR_DOMAIN_DISK_DEVICE_CDROM:
+    case VIR_DOMAIN_DISK_DEVICE_DISK:
+    case VIR_DOMAIN_DISK_DEVICE_LUN:
+        if (qemuDomainChangeBootIndex(vm, &orig_disk->info,
+                                      disk->info.bootIndex) < 0)
+            return -1;
+
+        orig_disk->info.bootIndex = disk->info.bootIndex;
+        break;
+    case VIR_DOMAIN_DISK_DEVICE_FLOPPY:
+    case VIR_DOMAIN_DISK_DEVICE_LAST:
+        virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+                       _("The boot index of disk bus '%s' cannot be updated."),
+                       virDomainDiskBusTypeToString(disk->bus));
+        return -1;
+    }
+    return 0;
+}
diff --git a/src/qemu/qemu_conf.h b/src/qemu/qemu_conf.h
index 4e2cd84fe5..43197afb7d 100644
--- a/src/qemu/qemu_conf.h
+++ b/src/qemu/qemu_conf.h
@@ -364,3 +364,10 @@ int qemuDomainChangeBootIndex(virDomainObj *vm,
                               virDomainDeviceInfo *devInfo,
                               int newBootIndex)
     ATTRIBUTE_NONNULL(2);
+
+int qemuCheckBootIndex(const int orig_bootindex,
+                       const int new_bootindex);
+
+int qemuChangeDiskBootIndex(virDomainObj *vm,
+                            virDomainDiskDef *orig_disk,
+                            virDomainDiskDef *disk);
-- 
2.33.0