[libvirt] [PATCH] qemu: Transfer inactive XML among cookie
Michal Privoznik
mprivozn at redhat.com
Thu Sep 15 14:04:03 UTC 2011
If a domain has inactive XML we want to transfer it to destination
when migrating with VIR_MIGRATE_PERSIST_DEST. In order to harm
the migration protocol as least as possible, a optional cookie was
chosen.
---
src/qemu/qemu_migration.c | 91 ++++++++++++++++++++++++++++++++++++++++----
1 files changed, 82 insertions(+), 9 deletions(-)
diff --git a/src/qemu/qemu_migration.c b/src/qemu/qemu_migration.c
index d9f8d93..bc98708 100644
--- a/src/qemu/qemu_migration.c
+++ b/src/qemu/qemu_migration.c
@@ -64,6 +64,7 @@ VIR_ENUM_IMPL(qemuMigrationJobPhase, QEMU_MIGRATION_PHASE_LAST,
enum qemuMigrationCookieFlags {
QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS,
QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE,
+ QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT,
QEMU_MIGRATION_COOKIE_FLAG_LAST
};
@@ -71,11 +72,12 @@ enum qemuMigrationCookieFlags {
VIR_ENUM_DECL(qemuMigrationCookieFlag);
VIR_ENUM_IMPL(qemuMigrationCookieFlag,
QEMU_MIGRATION_COOKIE_FLAG_LAST,
- "graphics", "lockstate");
+ "graphics", "lockstate", "persistent");
enum qemuMigrationCookieFeatures {
QEMU_MIGRATION_COOKIE_GRAPHICS = (1 << QEMU_MIGRATION_COOKIE_FLAG_GRAPHICS),
QEMU_MIGRATION_COOKIE_LOCKSTATE = (1 << QEMU_MIGRATION_COOKIE_FLAG_LOCKSTATE),
+ QEMU_MIGRATION_COOKIE_PERSISTENT = (1 << QEMU_MIGRATION_COOKIE_FLAG_PERSISTENT),
};
typedef struct _qemuMigrationCookieGraphics qemuMigrationCookieGraphics;
@@ -110,6 +112,9 @@ struct _qemuMigrationCookie {
/* If (flags & QEMU_MIGRATION_COOKIE_GRAPHICS) */
qemuMigrationCookieGraphicsPtr graphics;
+
+ /* If (flags & QEMU_MIGRATION_COOKIE_PERSISTENT) */
+ virDomainDefPtr persistent;
};
static void qemuMigrationCookieGraphicsFree(qemuMigrationCookieGraphicsPtr grap)
@@ -334,6 +339,26 @@ qemuMigrationCookieAddLockstate(qemuMigrationCookiePtr mig,
}
+static int
+qemuMigrationCookieAddPersistent(qemuMigrationCookiePtr mig,
+ virDomainObjPtr dom)
+{
+ if (mig->flags & QEMU_MIGRATION_COOKIE_PERSISTENT) {
+ qemuReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Migration persistent data already present"));
+ return -1;
+ }
+
+ if (!dom->newDef)
+ return 0;
+
+ mig->persistent = dom->newDef;
+ mig->flags |= QEMU_MIGRATION_COOKIE_PERSISTENT;
+ mig->flagsMandatory |= QEMU_MIGRATION_COOKIE_PERSISTENT;
+ return 0;
+}
+
+
static void qemuMigrationCookieGraphicsXMLFormat(virBufferPtr buf,
qemuMigrationCookieGraphicsPtr grap)
@@ -354,10 +379,12 @@ static void qemuMigrationCookieGraphicsXMLFormat(virBufferPtr buf,
static void qemuMigrationCookieXMLFormat(virBufferPtr buf,
- qemuMigrationCookiePtr mig)
+ qemuMigrationCookiePtr mig,
+ struct qemud_driver *driver)
{
char uuidstr[VIR_UUID_STRING_BUFLEN];
char hostuuidstr[VIR_UUID_STRING_BUFLEN];
+ char *domXML;
int i;
virUUIDFormat(mig->uuid, uuidstr);
@@ -388,15 +415,25 @@ static void qemuMigrationCookieXMLFormat(virBufferPtr buf,
virBufferAddLit(buf, " </lockstate>\n");
}
+ if ((mig->flags & QEMU_MIGRATION_COOKIE_PERSISTENT) &&
+ mig->persistent) {
+ domXML = qemuDomainDefFormatXML(driver, mig->persistent,
+ VIR_DOMAIN_XML_INACTIVE |
+ VIR_DOMAIN_XML_SECURE);
+ virBufferAdd(buf, domXML, -1);
+ VIR_FREE(domXML);
+ }
+
virBufferAddLit(buf, "</qemu-migration>\n");
}
-static char *qemuMigrationCookieXMLFormatStr(qemuMigrationCookiePtr mig)
+static char *qemuMigrationCookieXMLFormatStr(qemuMigrationCookiePtr mig,
+ struct qemud_driver *driver)
{
virBuffer buf = VIR_BUFFER_INITIALIZER;
- qemuMigrationCookieXMLFormat(&buf, mig);
+ qemuMigrationCookieXMLFormat(&buf, mig, driver);
if (virBufferError(&buf)) {
virReportOOMError();
@@ -460,6 +497,8 @@ error:
static int
qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
+ struct qemud_driver *driver,
+ xmlDocPtr doc,
xmlXPathContextPtr ctxt,
unsigned int flags)
{
@@ -583,6 +622,25 @@ qemuMigrationCookieXMLParse(qemuMigrationCookiePtr mig,
VIR_FREE(mig->lockState);
}
+ if ((flags & QEMU_MIGRATION_COOKIE_PERSISTENT) &&
+ virXPathBoolean("count(./domain) > 0", ctxt)) {
+ if ((n = virXPathNodeSet("./domain", ctxt, &nodes)) > 1) {
+ qemuReportError(VIR_ERR_INTERNAL_ERROR,
+ _("Too many domain elements in "
+ "migration cookie: %d"),
+ n);
+ goto error;
+ }
+ mig->persistent = virDomainDefParseNode(driver->caps, doc, nodes[0],
+ -1, VIR_DOMAIN_XML_INACTIVE);
+ if (!mig->persistent) {
+ /* virDomainDefParseNode already reported
+ * an error for us */
+ goto error;
+ }
+ VIR_FREE(nodes);
+ }
+
return 0;
error:
@@ -594,6 +652,7 @@ error:
static int
qemuMigrationCookieXMLParseStr(qemuMigrationCookiePtr mig,
+ struct qemud_driver *driver,
const char *xml,
unsigned int flags)
{
@@ -606,7 +665,7 @@ qemuMigrationCookieXMLParseStr(qemuMigrationCookiePtr mig,
if (!(doc = virXMLParseStringCtxt(xml, _("(qemu_migration_cookie)"), &ctxt)))
goto cleanup;
- ret = qemuMigrationCookieXMLParse(mig, ctxt, flags);
+ ret = qemuMigrationCookieXMLParse(mig, driver, doc, ctxt, flags);
cleanup:
xmlXPathFreeContext(ctxt);
@@ -637,7 +696,11 @@ qemuMigrationBakeCookie(qemuMigrationCookiePtr mig,
qemuMigrationCookieAddLockstate(mig, driver, dom) < 0)
return -1;
- if (!(*cookieout = qemuMigrationCookieXMLFormatStr(mig)))
+ if (flags & QEMU_MIGRATION_COOKIE_PERSISTENT &&
+ qemuMigrationCookieAddPersistent(mig, dom) < 0)
+ return -1;
+
+ if (!(*cookieout = qemuMigrationCookieXMLFormatStr(mig, driver)))
return -1;
*cookieoutlen = strlen(*cookieout) + 1;
@@ -672,6 +735,7 @@ qemuMigrationEatCookie(struct qemud_driver *driver,
if (cookiein && cookieinlen &&
qemuMigrationCookieXMLParseStr(mig,
+ driver,
cookiein,
flags) < 0)
goto error;
@@ -1575,7 +1639,8 @@ cleanup:
}
if (ret == 0 &&
- qemuMigrationBakeCookie(mig, driver, vm, cookieout, cookieoutlen, 0) < 0)
+ qemuMigrationBakeCookie(mig, driver, vm, cookieout, cookieoutlen,
+ QEMU_MIGRATION_COOKIE_PERSISTENT ) < 0)
VIR_WARN("Unable to encode migration cookie");
qemuMigrationCookieFree(mig);
@@ -2477,6 +2542,7 @@ qemuMigrationFinish(struct qemud_driver *driver,
int newVM = 1;
qemuMigrationCookiePtr mig = NULL;
virErrorPtr orig_err = NULL;
+ int cookie_flags = 0;
VIR_DEBUG("driver=%p, dconn=%p, vm=%p, cookiein=%s, cookieinlen=%d, "
"cookieout=%p, cookieoutlen=%p, flags=%lx, retcode=%d",
@@ -2490,7 +2556,11 @@ qemuMigrationFinish(struct qemud_driver *driver,
v3proto ? QEMU_MIGRATION_PHASE_FINISH3
: QEMU_MIGRATION_PHASE_FINISH2);
- if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein, cookieinlen, 0)))
+ if (flags & VIR_MIGRATE_PERSIST_DEST)
+ cookie_flags |= QEMU_MIGRATION_COOKIE_PERSISTENT;
+
+ if (!(mig = qemuMigrationEatCookie(driver, vm, cookiein,
+ cookieinlen, cookie_flags)))
goto endjob;
/* Did the migration go as planned? If yes, return the domain
@@ -2510,7 +2580,10 @@ qemuMigrationFinish(struct qemud_driver *driver,
if (vm->persistent)
newVM = 0;
vm->persistent = 1;
- vmdef = virDomainObjGetPersistentDef(driver->caps, vm);
+ if (mig->persistent)
+ vm->newDef = vmdef = mig->persistent;
+ else
+ vmdef = virDomainObjGetPersistentDef(driver->caps, vm);
if (virDomainSaveConfig(driver->configDir, vmdef) < 0) {
/* Hmpf. Migration was successful, but making it persistent
* was not. If we report successful, then when this domain
--
1.7.3.4
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