[libvirt] [PATCH V2 3/3] qemu: make persistent update of graphics device supported

[Wang Rui]

We can change vnc password by using virDomainUpdateDeviceFlags API with
live flag. But it can't be changed with config flag. Error is reported as
below.

error: Operation not supported: persistent update of device 'graphics' is not supported

This patch supports the graphics arguments changed with config flag.

Signed-off-by: Wang Rui <moon.wangrui at huawei.com>
---
 src/conf/domain_conf.c  |  2 +-
 src/qemu/qemu_driver.c  | 18 +++++++++++++++++-
 src/qemu/qemu_hotplug.c | 14 ++++++++++++++
 src/qemu/qemu_hotplug.h |  2 ++
 4 files changed, 34 insertions(+), 2 deletions(-)

diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c
index 2d81c37..468260c 100644
--- a/src/conf/domain_conf.c
+++ b/src/conf/domain_conf.c
@@ -21066,7 +21066,7 @@ virDomainDeviceDefCopy(virDomainDeviceDefPtr src,
 {
     virDomainDeviceDefPtr ret = NULL;
     virBuffer buf = VIR_BUFFER_INITIALIZER;
-    int flags = VIR_DOMAIN_XML_INACTIVE;
+    int flags = VIR_DOMAIN_XML_INACTIVE | VIR_DOMAIN_XML_SECURE;
     char *xmlStr = NULL;
     int rc = -1;
 
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 9152cf5..fa03cbe 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -7460,6 +7460,7 @@ qemuDomainUpdateDeviceConfig(virQEMUCapsPtr qemuCaps,
                              virDomainDeviceDefPtr dev)
 {
     virDomainDiskDefPtr orig, disk;
+    virDomainGraphicsDefPtr newGraphics;
     virDomainNetDefPtr net;
     int pos;
 
@@ -7498,6 +7499,22 @@ qemuDomainUpdateDeviceConfig(virQEMUCapsPtr qemuCaps,
         orig->startupPolicy = disk->startupPolicy;
         break;
 
+    case VIR_DOMAIN_DEVICE_GRAPHICS:
+        newGraphics = dev->data.graphics;
+        pos = qemuDomainFindGraphicsIndex(vmdef, newGraphics);
+        if (pos < 0) {
+            virReportError(VIR_ERR_INVALID_ARG,
+                           _("cannot find existing graphics type '%s' device to modify"),
+                           virDomainGraphicsTypeToString(newGraphics->type));
+            return -1;
+        }
+
+        virDomainGraphicsDefFree(vmdef->graphics[pos]);
+
+        vmdef->graphics[pos] = newGraphics;
+        dev->data.graphics = NULL;
+        break;
+
     case VIR_DOMAIN_DEVICE_NET:
         net = dev->data.net;
         if ((pos = virDomainNetFindIdx(vmdef, net)) < 0)
@@ -7517,7 +7534,6 @@ qemuDomainUpdateDeviceConfig(virQEMUCapsPtr qemuCaps,
     case VIR_DOMAIN_DEVICE_SOUND:
     case VIR_DOMAIN_DEVICE_VIDEO:
     case VIR_DOMAIN_DEVICE_WATCHDOG:
-    case VIR_DOMAIN_DEVICE_GRAPHICS:
     case VIR_DOMAIN_DEVICE_HUB:
     case VIR_DOMAIN_DEVICE_SMARTCARD:
     case VIR_DOMAIN_DEVICE_MEMBALLOON:
diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
index ec0122b..d7437db 100644
--- a/src/qemu/qemu_hotplug.c
+++ b/src/qemu/qemu_hotplug.c
@@ -2312,6 +2312,20 @@ qemuDomainFindGraphics(virDomainObjPtr vm,
 }
 
 int
+qemuDomainFindGraphicsIndex(virDomainDefPtr def,
+                            virDomainGraphicsDefPtr dev)
+{
+    size_t i;
+
+    for (i = 0; i < def->ngraphics; i++) {
+        if (def->graphics[i]->type == dev->type)
+            return i;
+    }
+
+    return -1;
+}
+
+int
 qemuDomainChangeGraphics(virQEMUDriverPtr driver,
                          virDomainObjPtr vm,
                          virDomainGraphicsDefPtr dev)
diff --git a/src/qemu/qemu_hotplug.h b/src/qemu/qemu_hotplug.h
index 1c9ca8f..d13c532 100644
--- a/src/qemu/qemu_hotplug.h
+++ b/src/qemu/qemu_hotplug.h
@@ -55,6 +55,8 @@ int qemuDomainAttachHostDevice(virConnectPtr conn,
                                virQEMUDriverPtr driver,
                                virDomainObjPtr vm,
                                virDomainHostdevDefPtr hostdev);
+int qemuDomainFindGraphicsIndex(virDomainDefPtr def,
+                                virDomainGraphicsDefPtr dev);
 int qemuDomainChangeGraphics(virQEMUDriverPtr driver,
                              virDomainObjPtr vm,
                              virDomainGraphicsDefPtr dev);
-- 
1.7.12.4