[PATCH V3 3/7] qemu: check the bootIndex could be changed or not

[Jiang Jiacheng]

Introduce qemuCheckBootIndex to check whether the device's
bootIndex can be changed or need to be changed. Only bootindex
of devices whose bootIndexSpecified is true can be changed.

Signed-off-by: Jiang Jiacheng <jiangjiacheng at huawei.com>
---
 src/qemu/qemu_domain.c | 32 ++++++++++++++++++++++++++++++++
 src/qemu/qemu_domain.h |  4 ++++
 2 files changed, 36 insertions(+)

diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 5c05032ce3..6ec3be14c0 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -12277,3 +12277,35 @@ qemuDomainSchedCoreStop(qemuDomainObjPrivate *priv)
         priv->schedCoreChildPID = -1;
     }
 }
+
+/**
+ * qemuCheckBootIndex:
+ * @devInfo: origin device info
+ * @new_bootindex: new bootIndex
+ *
+ * Check whether the device's bootIndex can be changed or need to
+ * be changed. Only devices with bootIndex specified before can be
+ * changed with @new_bootindex.
+ *
+ * Returns: 1 on need to change
+ *          0 on no need to change
+ *          -1 on could not change with an error
+ */
+int
+qemuCheckBootIndex(virDomainDeviceInfo *devInfo,
+                   const int new_bootindex)
+{
+    if (new_bootindex && !devInfo->bootIndexSpecified) {
+        virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
+                       _("this device does not set boot index, cannot change it."));
+        return -1;
+    }
+
+    /* if the new bootindex is different from the old bootindex,
+     * we will update the bootindex. */
+    if (devInfo->bootIndex != new_bootindex) {
+        return 1;
+    }
+
+    return 0;
+}
diff --git a/src/qemu/qemu_domain.h b/src/qemu/qemu_domain.h
index 2f027fad87..5869771a0d 100644
--- a/src/qemu/qemu_domain.h
+++ b/src/qemu/qemu_domain.h
@@ -1140,3 +1140,7 @@ qemuDomainSchedCoreStart(virQEMUDriverConfig *cfg,
 
 void
 qemuDomainSchedCoreStop(qemuDomainObjPrivate *priv);
+
+int
+qemuCheckBootIndex(virDomainDeviceInfo *devInfo,
+                   const int new_bootindex);
-- 
2.33.0