[libvirt] [PATCH v2 2/3] qemu: add support for dump-guest-core option
Martin Kletzander
mkletzan at redhat.com
Thu Sep 20 08:58:14 UTC 2012
The "dump-guest-core' option is new option for the machine type
(-machine pc,dump-guest-core) that controls whether the guest memory
will be marked as dumpable.
While testing this, I've found out that the value for the '-M' options
is not parsed correctly when additional parameters are used. However,
when '-machine' is used for the same options, it gets parsed as
expected. That's why this patch also modifies the parsing and creating
of the command line, so both '-M' and '-machine' are recognized. In
QEMU's help there is only mention of the 'machine parameter now with
no sign of the older '-M'.
---
src/qemu/qemu_capabilities.c | 4 +++
src/qemu/qemu_capabilities.h | 1 +
src/qemu/qemu_command.c | 81 +++++++++++++++++++++++++++++++++++++++-----
tests/qemuhelptest.c | 3 +-
4 files changed, 79 insertions(+), 10 deletions(-)
diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 3582cbd..4b52dc5 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -182,6 +182,7 @@ VIR_ENUM_IMPL(qemuCaps, QEMU_CAPS_LAST,
"seccomp-sandbox",
"reboot-timeout", /* 110 */
+ "dump-guest-core",
);
struct _qemuCaps {
@@ -1243,6 +1244,9 @@ qemuCapsComputeCmdFlags(const char *help,
if (strstr(help, "-no-shutdown") && (version < 14000 || version > 15000))
qemuCapsSet(caps, QEMU_CAPS_NO_SHUTDOWN);
+ if (strstr(help, "dump-guest-core=on|off"))
+ qemuCapsSet(caps, QEMU_CAPS_DUMP_GUEST_CORE);
+
/*
* Handling of -incoming arg with varying features
* -incoming tcp (kvm >= 79, qemu >= 0.10.0)
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index 2201cb3..a069f42 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -146,6 +146,7 @@ enum qemuCapsFlags {
QEMU_CAPS_SCSI_DISK_WWN = 108, /* Is scsi-disk.wwn available? */
QEMU_CAPS_SECCOMP_SANDBOX = 109, /* -sandbox */
QEMU_CAPS_REBOOT_TIMEOUT = 110, /* -boot reboot-timeout */
+ QEMU_CAPS_DUMP_GUEST_CORE = 111, /* dump-guest-core-parameter */
QEMU_CAPS_LAST, /* this must always be the last item */
};
diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index 3807596..52ad4d2 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -4306,6 +4306,45 @@ no_memory:
goto cleanup;
}
+static int
+qemuBuildMachineArgStr(virCommandPtr cmd,
+ const virDomainDefPtr def,
+ qemuCapsPtr caps)
+{
+ /* This should *never* be NULL, since we always provide
+ * a machine in the capabilities data for QEMU. So this
+ * check is just here as a safety in case the unexpected
+ * happens */
+ if (!def->os.machine)
+ return 0;
+
+ if (!def->mem.dump_core) {
+ /* if no parameter to the machine type is needed, we still use
+ * '-M' to keep the most of the compatibility with older versions.
+ */
+ virCommandAddArgList(cmd, "-M", def->os.machine, NULL);
+ } else {
+ if (!qemuCapsGet(caps, QEMU_CAPS_DUMP_GUEST_CORE)) {
+ virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
+ "%s", _("dump-guest-core is not available "
+ " with this QEMU binary"));
+ return -1;
+ }
+
+ /* However, in case there is a parameter to be added, we need to
+ * use the "-machine" parameter because qemu is not parsing the
+ * "-M" correctly */
+ virCommandAddArg(cmd, "-machine");
+ virCommandAddArgFormat(cmd,
+ "%s,%s=%s",
+ def->os.machine,
+ "dump-guest-core",
+ virDomainMemDumpTypeToString(def->mem.dump_core));
+ }
+
+ return 0;
+}
+
static char *
qemuBuildSmpArgStr(const virDomainDefPtr def,
qemuCapsPtr caps)
@@ -4498,12 +4537,8 @@ qemuBuildCommandLine(virConnectPtr conn,
}
virCommandAddArg(cmd, "-S"); /* freeze CPU */
- /* This should *never* be NULL, since we always provide
- * a machine in the capabilities data for QEMU. So this
- * check is just here as a safety in case the unexpected
- * happens */
- if (def->os.machine)
- virCommandAddArgList(cmd, "-M", def->os.machine, NULL);
+ if (qemuBuildMachineArgStr(cmd, def, caps) < 0)
+ goto error;
if (qemuBuildCpuArgStr(driver, def, emulator, caps,
&ut, &cpu, &hasHwVirt, !!migrateFrom) < 0)
@@ -8320,10 +8355,38 @@ virDomainDefPtr qemuParseCommandLine(virCapsPtr caps,
}
if (STREQ(def->name, ""))
VIR_FREE(def->name);
- } else if (STREQ(arg, "-M")) {
+ } else if (STREQ(arg, "-M") ||
+ STREQ(arg, "-machine")) {
+ char *params;
WANT_VALUE();
- if (!(def->os.machine = strdup(val)))
- goto no_memory;
+ params = strchr(val, ',');
+ if (params == NULL) {
+ if (!(def->os.machine = strdup(val)))
+ goto no_memory;
+ } else {
+ if (!(def->os.machine = strndup(val, params - val)))
+ goto no_memory;
+
+ while(params++) {
+ /* prepared for more "-machine" parameters */
+ char *tmp = params;
+ params = strchr(params, ',');
+
+ if (STRPREFIX(tmp, "dump-guest-core=")) {
+ tmp += strlen("dump-guest-core=");
+ if (params) {
+ tmp = strndup(tmp, params - tmp);
+ if (tmp == NULL)
+ goto no_memory;
+ }
+ def->mem.dump_core = virDomainMemDumpTypeFromString(tmp);
+ if (def->mem.dump_core < 0)
+ def->mem.dump_core = VIR_DOMAIN_MEM_DUMP_DEFAULT;
+ if (params)
+ VIR_FREE(tmp);
+ }
+ }
+ }
} else if (STREQ(arg, "-serial")) {
WANT_VALUE();
if (STRNEQ(val, "none")) {
diff --git a/tests/qemuhelptest.c b/tests/qemuhelptest.c
index a3d9656..079aef8 100644
--- a/tests/qemuhelptest.c
+++ b/tests/qemuhelptest.c
@@ -846,7 +846,8 @@ mymain(void)
QEMU_CAPS_VIRTIO_SCSI_PCI,
QEMU_CAPS_BLOCKIO,
QEMU_CAPS_SCSI_DISK_WWN,
- QEMU_CAPS_SECCOMP_SANDBOX);
+ QEMU_CAPS_SECCOMP_SANDBOX,
+ QEMU_CAPS_DUMP_GUEST_CORE);
return ret == 0 ? EXIT_SUCCESS : EXIT_FAILURE;
}
--
1.7.12
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