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qemu: Fallback to HMP for snapshot commands

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qemu driver in libvirt gained support for creating domain snapshots
almost a year ago in libvirt 0.8.0. Since then we enabled QMP support
for qemu >= 0.13.0 but QMP equivalents of {save,load,del}vm commands are
not implemented in current qemu (0.14.0) so the domain snapshot support
is not very useful.

This patch detects when the appropriate QMP command is not implemented
and tries to use human-monitor-command (aka HMP passthrough) to run
it's HMP equivalent.
This commit is contained in:
Jiri Denemark 2011-02-23 12:12:11 +01:00
parent b3c6ec03b8
commit 89241fe0d1
1 changed files with 31 additions and 9 deletions
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34
src/qemu/qemu_monitor_json.c
View File

@ -31,6 +31,7 @@
#include <string.h>
#include <sys/time.h>
#include "qemu_monitor_text.h"
#include "qemu_monitor_json.h"
#include "qemu_command.h"
#include "memory.h"
@ -2451,11 +2452,18 @@ int qemuMonitorJSONCreateSnapshot(qemuMonitorPtr mon, const char *name)
if (!cmd)
return -1;
ret = qemuMonitorJSONCommand(mon, cmd, &reply);
if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
goto cleanup;
if (qemuMonitorJSONHasError(reply, "CommandNotFound")) {
VIR_DEBUG0("savevm command not found, trying HMP");
ret = qemuMonitorTextCreateSnapshot(mon, name);
goto cleanup;
}
if (ret == 0)
ret = qemuMonitorJSONCheckError(cmd, reply);
cleanup:
virJSONValueFree(cmd);
virJSONValueFree(reply);
return ret;
@ -2473,11 +2481,18 @@ int qemuMonitorJSONLoadSnapshot(qemuMonitorPtr mon, const char *name)
if (!cmd)
return -1;
ret = qemuMonitorJSONCommand(mon, cmd, &reply);
if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
goto cleanup;
if (qemuMonitorJSONHasError(reply, "CommandNotFound")) {
VIR_DEBUG0("loadvm command not found, trying HMP");
ret = qemuMonitorTextLoadSnapshot(mon, name);
goto cleanup;
}
if (ret == 0)
ret = qemuMonitorJSONCheckError(cmd, reply);
cleanup:
virJSONValueFree(cmd);
virJSONValueFree(reply);
return ret;
@ -2495,11 +2510,18 @@ int qemuMonitorJSONDeleteSnapshot(qemuMonitorPtr mon, const char *name)
if (!cmd)
return -1;
ret = qemuMonitorJSONCommand(mon, cmd, &reply);
if ((ret = qemuMonitorJSONCommand(mon, cmd, &reply)) < 0)
goto cleanup;
if (qemuMonitorJSONHasError(reply, "CommandNotFound")) {
VIR_DEBUG0("delvm command not found, trying HMP");
ret = qemuMonitorTextDeleteSnapshot(mon, name);
goto cleanup;
}
if (ret == 0)
ret = qemuMonitorJSONCheckError(cmd, reply);
cleanup:
virJSONValueFree(cmd);
virJSONValueFree(reply);
return ret;