[libvirt] [PATCH v7 2/4] qemu: add qemuMonitorGetDumpGuestMemoryCapability

[qiaonuohan at cn.fujitsu.com]

This patch adds qemuMonitorGetDumpGuestMemoryCapability, which is used to check
whether the specified dump-guest-memory format is supported by qemu.

Signed-off-by: Qiao Nuohan <qiaonuohan at cn.fujitsu.com>
---
 src/qemu/qemu_monitor.c      | 21 ++++++++++++++
 src/qemu/qemu_monitor.h      |  3 ++
 src/qemu/qemu_monitor_json.c | 65 ++++++++++++++++++++++++++++++++++++++++++++
 src/qemu/qemu_monitor_json.h |  3 ++
 4 files changed, 92 insertions(+)

diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index a2769db..8104104 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -2344,6 +2344,27 @@ int qemuMonitorMigrateCancel(qemuMonitorPtr mon)
     return ret;
 }
 
+/**
+ * Returns 1 if @capability is supported, 0 if it's not, or -1 on error.
+ */
+int qemuMonitorGetDumpGuestMemoryCapability(qemuMonitorPtr mon,
+                                            const char *capability)
+{
+    VIR_DEBUG("mon=%p capability=%s", mon, capability);
+
+    if (!mon) {
+        virReportError(VIR_ERR_INVALID_ARG, "%s",
+                       _("monitor must not be NULL"));
+        return -1;
+    }
+
+    /* No capability is supported without JSON monitor */
+    if (!mon->json)
+        return 0;
+
+    return qemuMonitorJSONGetDumpGuestMemoryCapability(mon, capability);
+}
+
 int
 qemuMonitorDumpToFd(qemuMonitorPtr mon, int fd)
 {
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index eabf000..00a6554 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -494,6 +494,9 @@ int qemuMonitorMigrateToUnix(qemuMonitorPtr mon,
 
 int qemuMonitorMigrateCancel(qemuMonitorPtr mon);
 
+int qemuMonitorGetDumpGuestMemoryCapability(qemuMonitorPtr mon,
+                                            const char *capability);
+
 int qemuMonitorDumpToFd(qemuMonitorPtr mon,
                         int fd);
 
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index ee3ae15..2cf706c 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -2635,6 +2635,71 @@ int qemuMonitorJSONMigrateCancel(qemuMonitorPtr mon)
 }
 
 int
+qemuMonitorJSONGetDumpGuestMemoryCapability(qemuMonitorPtr mon,
+                                            const char *capability)
+{
+    int ret;
+    virJSONValuePtr cmd;
+    virJSONValuePtr reply = NULL;
+    virJSONValuePtr caps;
+    virJSONValuePtr formats;
+    size_t i;
+
+    if (!(cmd = qemuMonitorJSONMakeCommand("query-dump-guest-memory-capability",
+                                           NULL)))
+        return -1;
+
+    ret = qemuMonitorJSONCommand(mon, cmd, &reply);
+
+    if (ret == 0) {
+        if (qemuMonitorJSONHasError(reply, "CommandNotFound"))
+            goto cleanup;
+        ret = qemuMonitorJSONCheckError(cmd, reply);
+    }
+
+    if (ret < 0)
+        goto cleanup;
+
+    ret = -1;
+
+    caps = virJSONValueObjectGet(reply, "return");
+    if (!caps || caps->type != VIR_JSON_TYPE_OBJECT) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("missing dump guest memory capabilities"));
+        goto cleanup;
+    }
+
+    formats = virJSONValueObjectGet(caps, "formats");
+    if (!formats || formats->type != VIR_JSON_TYPE_ARRAY) {
+        virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                       _("missing supported dump formats"));
+        goto cleanup;
+    }
+
+    for (i = 0; i < virJSONValueArraySize(formats); i++) {
+        virJSONValuePtr dumpformat = virJSONValueArrayGet(formats, i);
+
+        if (!dumpformat || dumpformat->type != VIR_JSON_TYPE_STRING) {
+            virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+                           _("missing entry in supported dump formats"));
+            goto cleanup;
+        }
+
+        if (STREQ(virJSONValueGetString(dumpformat), capability)) {
+            ret = 1;
+            goto cleanup;
+        }
+
+        ret = 0;
+    }
+
+cleanup:
+    virJSONValueFree(cmd);
+    virJSONValueFree(reply);
+    return ret;
+}
+
+int
 qemuMonitorJSONDump(qemuMonitorPtr mon,
                     const char *protocol)
 {
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index a93c51e..37e9456 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -147,6 +147,9 @@ int qemuMonitorJSONGetSpiceMigrationStatus(qemuMonitorPtr mon,
 
 int qemuMonitorJSONMigrateCancel(qemuMonitorPtr mon);
 
+int qemuMonitorJSONGetDumpGuestMemoryCapability(qemuMonitorPtr mon,
+                                                const char *capability);
+
 int qemuMonitorJSONDump(qemuMonitorPtr mon,
                         const char *protocol);
 
-- 
1.8.5.3