[libvirt] [PATCH v4 2/2] qemu_process: detect updated video ram size values from QEMU
Pavel Hrdina
phrdina at redhat.com
Wed Jan 14 09:27:29 UTC 2015
QEMU internally updates the size of video memory if the domain XML had
provided too low memory size or there are some dependencies for a QXL
devices 'vgamem' and 'ram' size. We need to know about the changes and
store them into the status XML to not break migration or managedsave
through different libvirt versions.
The values would be loaded only if the "vgamem_mb" property exists for
the device. The presence of the "vgamem_mb" also tells that the
"ram_size" and "vram_size" exists for QXL devices.
Signed-off-by: Pavel Hrdina <phrdina at redhat.com>
---
src/qemu/qemu_monitor.c | 34 ++++++++++++++++++
src/qemu/qemu_monitor.h | 4 +++
src/qemu/qemu_monitor_json.c | 69 ++++++++++++++++++++++++++++++++++++
src/qemu/qemu_monitor_json.h | 3 ++
src/qemu/qemu_process.c | 83 ++++++++++++++++++++++++++++++++++++++++++++
5 files changed, 193 insertions(+)
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index 55f07f3..6882a50 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -1154,6 +1154,40 @@ qemuMonitorFindBalloonObjectPath(qemuMonitorPtr mon,
return ret;
}
+
+/**
+ * To update video memory size in status XML we need to load correct values from
+ * QEMU. This is supported only with JSON monitor.
+ *
+ * Returns 0 on success, -1 on failure and sets proper error message.
+ */
+int
+qemuMonitorUpdateVideoMemorySize(qemuMonitorPtr mon,
+ virDomainVideoDefPtr video,
+ const char *videoName)
+{
+ int ret = -1;
+ char *path = NULL;
+
+ if (mon->json) {
+ ret = qemuMonitorFindObjectPath(mon, "/", videoName, &path);
+ if (ret < 0) {
+ if (ret == -2)
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Failed to find QOM Object path for "
+ "device '%s'"), videoName);
+ return -1;
+ }
+
+ ret = qemuMonitorJSONUpdateVideoMemorySize(mon, video, path);
+ VIR_FREE(path);
+ return ret;
+ }
+
+ return 0;
+}
+
+
int qemuMonitorHMPCommandWithFd(qemuMonitorPtr mon,
const char *cmd,
int scm_fd,
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index edab66f..133d42d 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -243,6 +243,10 @@ virJSONValuePtr qemuMonitorGetOptions(qemuMonitorPtr mon)
ATTRIBUTE_NONNULL(1);
void qemuMonitorSetOptions(qemuMonitorPtr mon, virJSONValuePtr options)
ATTRIBUTE_NONNULL(1);
+int qemuMonitorUpdateVideoMemorySize(qemuMonitorPtr mon,
+ virDomainVideoDefPtr video,
+ const char *videName)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(2) ATTRIBUTE_NONNULL(3);
int qemuMonitorHMPCommandWithFd(qemuMonitorPtr mon,
const char *cmd,
int scm_fd,
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index e567aa7..da5c14d 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -1300,6 +1300,75 @@ int qemuMonitorJSONGetVirtType(qemuMonitorPtr mon,
}
+/**
+ * Loads correct video memory size values from QEMU and update the video
+ * definition.
+ *
+ * Return 0 on success, -1 on failure and set proper error message.
+ */
+int
+qemuMonitorJSONUpdateVideoMemorySize(qemuMonitorPtr mon,
+ virDomainVideoDefPtr video,
+ char *path)
+{
+ qemuMonitorJSONObjectProperty prop = {
+ QEMU_MONITOR_OBJECT_PROPERTY_ULONG,
+ {0}
+ };
+
+ switch (video->type) {
+ case VIR_DOMAIN_VIDEO_TYPE_VGA:
+ if (qemuMonitorJSONGetObjectProperty(mon, path, "vgamem_mb", &prop) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("QOM Objext '%s' has no property 'vgamem_mb'"),
+ path);
+ return -1;
+ }
+ video->vram = prop.val.ul * 1024;
+ break;
+ case VIR_DOMAIN_VIDEO_TYPE_QXL:
+ if (qemuMonitorJSONGetObjectProperty(mon, path, "vram_size", &prop) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("QOM Objext '%s' has no property 'vram_size'"),
+ path);
+ return -1;
+ }
+ video->vram = prop.val.ul / 1024;
+ if (qemuMonitorJSONGetObjectProperty(mon, path, "ram_size", &prop) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("QOM Objext '%s' has no property 'ram_size'"),
+ path);
+ return -1;
+ }
+ video->ram = prop.val.ul / 1024;
+ if (qemuMonitorJSONGetObjectProperty(mon, path, "vgamem_mb", &prop) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("QOM Objext '%s' has no property 'vgamem_mb'"),
+ path);
+ return -1;
+ }
+ video->vgamem = prop.val.ul * 1024;
+ break;
+ case VIR_DOMAIN_VIDEO_TYPE_VMVGA:
+ if (qemuMonitorJSONGetObjectProperty(mon, path, "vgamem_mb", &prop) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("QOM Objext '%s' has no property 'vgamem_mb'"),
+ path);
+ return -1;
+ }
+ video->vram = prop.val.ul * 1024;
+ break;
+ case VIR_DOMAIN_VIDEO_TYPE_CIRRUS:
+ case VIR_DOMAIN_VIDEO_TYPE_XEN:
+ case VIR_DOMAIN_VIDEO_TYPE_VBOX:
+ case VIR_DOMAIN_VIDEO_TYPE_LAST:
+ break;
+ }
+
+ return 0;
+}
+
+
/*
* Returns: 0 if balloon not supported, +1 if balloon query worked
* or -1 on failure
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index 222f11e..1da1a00 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -57,6 +57,9 @@ int qemuMonitorJSONGetCPUInfo(qemuMonitorPtr mon,
int **pids);
int qemuMonitorJSONGetVirtType(qemuMonitorPtr mon,
int *virtType);
+int qemuMonitorJSONUpdateVideoMemorySize(qemuMonitorPtr mon,
+ virDomainVideoDefPtr video,
+ char *path);
int qemuMonitorJSONGetBalloonInfo(qemuMonitorPtr mon,
unsigned long long *currmem);
int qemuMonitorJSONGetMemoryStats(qemuMonitorPtr mon,
diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c
index c18204b..6840fd4 100644
--- a/src/qemu/qemu_process.c
+++ b/src/qemu/qemu_process.c
@@ -3067,6 +3067,85 @@ qemuProcessCleanupChardevDevice(virDomainDefPtr def ATTRIBUTE_UNUSED,
}
+/**
+ * Loads and update video memory size for video devices according to QEMU
+ * process as the QEMU will silently update the values that we pass to QEMU
+ * through command line. We need to load these updated values and store them
+ * into the status XML.
+ *
+ * We will fail if for some reason the values cannot be loaded from QEMU because
+ * its mandatory to get the correct video memory size to status XML to not break
+ * migration.
+ */
+static int
+qemuProcessUpdateVideoRamSize(virQEMUDriverPtr driver,
+ virDomainObjPtr vm,
+ int asyncJob)
+{
+ int ret = -1;
+ ssize_t i;
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+ virDomainVideoDefPtr video = NULL;
+ virQEMUDriverConfigPtr cfg = NULL;
+
+ if (qemuDomainObjEnterMonitorAsync(driver, vm, asyncJob) < 0)
+ return -1;
+
+ for (i = 0; i < vm->def->nvideos; i++) {
+ video = vm->def->videos[i];
+
+ switch (video->type) {
+ case VIR_DOMAIN_VIDEO_TYPE_VGA:
+ if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_VGA_VGAMEM)) {
+ if (qemuMonitorUpdateVideoMemorySize(priv->mon, video, "VGA") < 0)
+ goto error;
+ }
+ break;
+ case VIR_DOMAIN_VIDEO_TYPE_QXL:
+ if (i == 0) {
+ if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_QXL_VGA_VGAMEM)) {
+ if (qemuMonitorUpdateVideoMemorySize(priv->mon, video,
+ "qxl-vga") < 0)
+ goto error;
+ }
+ } else {
+ if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_QXL_VGAMEM)) {
+ if (qemuMonitorUpdateVideoMemorySize(priv->mon, video,
+ "qxl") < 0)
+ goto error;
+ }
+ }
+ break;
+ case VIR_DOMAIN_VIDEO_TYPE_VMVGA:
+ if (virQEMUCapsGet(priv->qemuCaps, QEMU_CAPS_VMWARE_SVGA_VGAMEM)) {
+ if (qemuMonitorUpdateVideoMemorySize(priv->mon, video,
+ "vmware-svga") < 0)
+ goto error;
+ }
+ break;
+ case VIR_DOMAIN_VIDEO_TYPE_CIRRUS:
+ case VIR_DOMAIN_VIDEO_TYPE_XEN:
+ case VIR_DOMAIN_VIDEO_TYPE_VBOX:
+ case VIR_DOMAIN_VIDEO_TYPE_LAST:
+ break;
+ }
+
+ }
+
+ qemuDomainObjExitMonitor(driver, vm);
+
+ cfg = virQEMUDriverGetConfig(driver);
+ ret = virDomainSaveStatus(driver->xmlopt, cfg->stateDir, vm);
+ virObjectUnref(cfg);
+
+ return ret;
+
+ error:
+ qemuDomainObjExitMonitor(driver, vm);
+ return -1;
+}
+
+
struct qemuProcessHookData {
virConnectPtr conn;
virDomainObjPtr vm;
@@ -4801,6 +4880,10 @@ int qemuProcessStart(virConnectPtr conn,
}
qemuDomainObjExitMonitor(driver, vm);
+ VIR_DEBUG("Detecting actual memory size for video device");
+ if (qemuProcessUpdateVideoRamSize(driver, vm, asyncJob) < 0)
+ goto cleanup;
+
if (!(flags & VIR_QEMU_PROCESS_START_PAUSED)) {
VIR_DEBUG("Starting domain CPUs");
/* Allow the CPUS to start executing */
--
2.0.5
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