[libvirt] [PATCH v3 2/5] vz: add migration backbone code
nshirokovskiy at virtuozzo.com
nshirokovskiy at virtuozzo.com
Tue Aug 25 09:04:14 UTC 2015
From: Nikolay Shirokovskiy <nshirokovskiy at virtuozzo.com>
This patch makes basic vz migration possible. For example by virsh:
virsh -c vz:///system migrate --direct $NAME $STUB vz+ssh://$DST/system
$STUB could be anything as it is required virsh argument but it is not
used in direct migration.
Vz migration is implemented as direct migration. The reason is that vz sdk do
all the job. Prepare phase function is used to pass session uuid from
destination to source so we don't introduce new rpc call.
Signed-off-by: Nikolay Shirokovskiy <nshirokovskiy at virtuozzo.com>
---
src/libvirt-domain.c | 3 +-
src/vz/vz_driver.c | 193 ++++++++++++++++++++++++++++++++++++++++++++++++++
src/vz/vz_sdk.c | 33 +++++++++
src/vz/vz_sdk.h | 2 +
4 files changed, 230 insertions(+), 1 deletions(-)
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index cbf08fc..8577edd 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -3425,7 +3425,8 @@ virDomainMigrateDirect(virDomainPtr domain,
NULLSTR(xmlin), flags, NULLSTR(dname), NULLSTR(uri),
bandwidth);
- if (!domain->conn->driver->domainMigratePerform) {
+ if (!domain->conn->driver->domainMigratePerform &&
+ !domain->conn->driver->domainMigratePerform3) {
virReportUnsupportedError();
return -1;
}
diff --git a/src/vz/vz_driver.c b/src/vz/vz_driver.c
index 8fa7957..f82fff8 100644
--- a/src/vz/vz_driver.c
+++ b/src/vz/vz_driver.c
@@ -1343,6 +1343,196 @@ vzDomainMemoryStats(virDomainPtr domain,
return ret;
}
+static char*
+vzFormatCookie(const unsigned char *session_uuid)
+{
+ char uuidstr[VIR_UUID_STRING_BUFLEN];
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+
+ virBufferAddLit(&buf, "<vz-migration1>\n");
+ virUUIDFormat(session_uuid, uuidstr);
+ virBufferAsprintf(&buf, "<session_uuid>%s</session_uuid>\n", uuidstr);
+ virBufferAddLit(&buf, "</vz-migration1>\n");
+
+ if (virBufferCheckError(&buf) < 0)
+ return NULL;
+
+ return virBufferContentAndReset(&buf);
+}
+
+static int
+vzParseCookie(const char *xml, unsigned char *session_uuid)
+{
+ xmlDocPtr doc = NULL;
+ xmlXPathContextPtr ctx = NULL;
+ char *tmp = NULL;
+ int ret = -1;
+
+ if (!(doc = virXMLParseStringCtxt(xml, _("(_migration_cookie)"), &ctx)))
+ goto cleanup;
+
+ if (!(tmp = virXPathString("string(./session_uuid[1])", ctx))) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("missing session_uuid element in migration data"));
+ goto cleanup;
+ }
+ if (virUUIDParse(tmp, session_uuid) < 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("malformed session_uuid element in migration data"));
+ goto cleanup;
+ }
+ ret = 0;
+
+ cleanup:
+ xmlXPathFreeContext(ctx);
+ xmlFreeDoc(doc);
+ VIR_FREE(tmp);
+
+ return ret;
+}
+
+static int
+vzDomainMigratePrepare3(virConnectPtr conn,
+ const char *cookiein ATTRIBUTE_UNUSED,
+ int cookieinlen ATTRIBUTE_UNUSED,
+ char **cookieout,
+ int *cookieoutlen,
+ const char *uri_in ATTRIBUTE_UNUSED,
+ char **uri_out ATTRIBUTE_UNUSED,
+ unsigned long flags,
+ const char *dname ATTRIBUTE_UNUSED,
+ unsigned long resource ATTRIBUTE_UNUSED,
+ const char *dom_xml ATTRIBUTE_UNUSED)
+{
+ vzConnPtr privconn = conn->privateData;
+ int ret = -1;
+
+ virCheckFlags(0, -1);
+
+ if (!(*cookieout = vzFormatCookie(privconn->session_uuid)))
+ goto cleanup;
+ *cookieoutlen = strlen(*cookieout) + 1;
+ ret = 0;
+
+ cleanup:
+ if (ret != 0) {
+ VIR_FREE(*cookieout);
+ *cookieoutlen = 0;
+ }
+
+ return ret;
+}
+
+static int
+vzConnectSupportsFeature(virConnectPtr conn ATTRIBUTE_UNUSED, int feature)
+{
+ switch (feature) {
+ case VIR_DRV_FEATURE_MIGRATION_V3:
+ case VIR_DRV_FEATURE_MIGRATION_DIRECT:
+ return 1;
+ default:
+ return 0;
+ }
+}
+
+static virURIPtr
+vzMakeVzUri(const char *connuri_str)
+{
+ virURIPtr connuri = NULL;
+ virURIPtr vzuri = NULL;
+ int ret = -1;
+
+ if (!(connuri = virURIParse(connuri_str)))
+ goto cleanup;
+
+ if (VIR_ALLOC(vzuri) < 0)
+ goto cleanup;
+ memset(vzuri, 0, sizeof(*vzuri));
+
+ if (VIR_STRDUP(vzuri->server, connuri->server) < 0)
+ goto cleanup;
+ vzuri->port = connuri->port;
+ ret = 0;
+
+ cleanup:
+
+ virURIFree(connuri);
+ if (ret < 0) {
+ virURIFree(vzuri);
+ vzuri = NULL;
+ }
+
+ return vzuri;
+}
+
+#define VZ_MIGRATION_FLAGS (0)
+
+#define VZ_MIGRATION_PARAMETERS (NULL)
+
+static int
+vzDomainMigratePerform3(virDomainPtr domain,
+ const char *xmlin ATTRIBUTE_UNUSED,
+ const char *cookiein ATTRIBUTE_UNUSED,
+ int cookieinlen ATTRIBUTE_UNUSED,
+ char **cookieout ATTRIBUTE_UNUSED,
+ int *cookieoutlen ATTRIBUTE_UNUSED,
+ const char *dconnuri ATTRIBUTE_UNUSED,
+ const char *uri,
+ unsigned long flags,
+ const char *dname ATTRIBUTE_UNUSED,
+ unsigned long bandwidth ATTRIBUTE_UNUSED)
+{
+ int ret = -1;
+ virDomainObjPtr dom = NULL;
+ virConnectPtr dconn = NULL;
+ virURIPtr vzuri = NULL;
+ unsigned char session_uuid[VIR_UUID_BUFLEN];
+ vzConnPtr privconn = domain->conn->privateData;
+ char *cookie = NULL;
+ int cookielen = 0;
+
+ virCheckFlags(VZ_MIGRATION_FLAGS, -1);
+
+ if (!(vzuri = vzMakeVzUri(uri)))
+ goto cleanup;
+
+ if (!(dom = vzDomObjFromDomain(domain)))
+ goto cleanup;
+
+ dconn = virConnectOpen(uri);
+ if (dconn == NULL) {
+ virReportError(VIR_ERR_OPERATION_FAILED,
+ _("Failed to connect to remote libvirt URI %s: %s"),
+ uri, virGetLastErrorMessage());
+ goto cleanup;
+ }
+
+ /* NULL and zero elements are unused */
+ /* domxml is passed as "" or otherwise we will fail at rpc call */
+ if (virDomainMigratePrepare3(dconn, NULL, 0, &cookie, &cookielen, NULL, NULL, 0, NULL, 0, "") < 0)
+ goto cleanup;
+
+ if (vzParseCookie(cookie, session_uuid) < 0)
+ goto cleanup;
+
+ if (prlsdkMigrate(dom, vzuri, session_uuid) < 0)
+ goto cleanup;
+
+ virDomainObjListRemove(privconn->domains, dom);
+ dom = NULL;
+
+ ret = 0;
+
+ cleanup:
+ if (dom)
+ virObjectUnlock(dom);
+ virObjectUnref(dconn);
+ virURIFree(vzuri);
+ VIR_FREE(cookie);
+
+ return ret;
+}
+
static virHypervisorDriver vzDriver = {
.name = "vz",
.connectOpen = vzConnectOpen, /* 0.10.0 */
@@ -1396,6 +1586,9 @@ static virHypervisorDriver vzDriver = {
.domainBlockStatsFlags = vzDomainBlockStatsFlags, /* 1.2.17 */
.domainInterfaceStats = vzDomainInterfaceStats, /* 1.2.17 */
.domainMemoryStats = vzDomainMemoryStats, /* 1.2.17 */
+ .connectSupportsFeature = vzConnectSupportsFeature, /* 1.2.19 */
+ .domainMigratePrepare3 = vzDomainMigratePrepare3, /* 1.2.19 */
+ .domainMigratePerform3 = vzDomainMigratePerform3, /* 1.2.19 */
};
static virConnectDriver vzConnectDriver = {
diff --git a/src/vz/vz_sdk.c b/src/vz/vz_sdk.c
index f7253de..783438d 100644
--- a/src/vz/vz_sdk.c
+++ b/src/vz/vz_sdk.c
@@ -4054,3 +4054,36 @@ prlsdkGetMemoryStats(virDomainObjPtr dom,
return ret;
}
+
+/* high security is default choice for 2 reasons:
+ 1. as this is the highest set security we can't get
+ reject from server with high security settings
+ 2. this is on par with security level of driver
+ connection to dispatcher */
+
+#define PRLSDK_MIGRATION_FLAGS (PSL_HIGH_SECURITY)
+
+int prlsdkMigrate(virDomainObjPtr dom, virURIPtr uri,
+ const unsigned char *session_uuid)
+{
+ int ret = -1;
+ vzDomObjPtr privdom = dom->privateData;
+ PRL_HANDLE job = PRL_INVALID_HANDLE;
+ char uuidstr[VIR_UUID_STRING_BUFLEN + 2];
+
+ prlsdkUUIDFormat(session_uuid, uuidstr);
+ job = PrlVm_MigrateEx(privdom->sdkdom, uri->server, uri->port, uuidstr,
+ "", /* use default dir for migrated instance bundle */
+ PRLSDK_MIGRATION_FLAGS,
+ 0, /* reserved flags */
+ PRL_TRUE /* don't ask for confirmations */
+ );
+
+ if (PRL_FAILED(waitJob(job)))
+ goto cleanup;
+
+ ret = 0;
+
+ cleanup:
+ return ret;
+}
diff --git a/src/vz/vz_sdk.h b/src/vz/vz_sdk.h
index ebe4591..d3f0caf 100644
--- a/src/vz/vz_sdk.h
+++ b/src/vz/vz_sdk.h
@@ -76,3 +76,5 @@ int
prlsdkGetVcpuStats(virDomainObjPtr dom, int idx, unsigned long long *time);
int
prlsdkGetMemoryStats(virDomainObjPtr dom, virDomainMemoryStatPtr stats, unsigned int nr_stats);
+int
+prlsdkMigrate(virDomainObjPtr dom, virURIPtr uri, const char unsigned *session_uuid);
--
1.7.1
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