[libvirt] [PATCH v2 10/11] libxl: Grab modify job for changing domain XML
Michal Privoznik
mprivozn at redhat.com
Wed Jun 5 09:09:18 UTC 2019
The reasoning here is the same as in qemu driver fixed in
previous commit. Long story short, changing an XML of a domain
requires modify job to be acquired.
Signed-off-by: Michal Privoznik <mprivozn at redhat.com>
---
src/libxl/libxl_domain.c | 57 +++++++++++++++++++++++++++++++++++++
src/libxl/libxl_domain.h | 7 +++++
src/libxl/libxl_driver.c | 24 ++++------------
src/libxl/libxl_migration.c | 14 +++------
4 files changed, 73 insertions(+), 29 deletions(-)
diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 2d8569e592..f2e1af52e5 100644
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -65,6 +65,63 @@ libxlDomainObjPrivateOnceInit(void)
VIR_ONCE_GLOBAL_INIT(libxlDomainObjPrivate);
+
+/**
+ * libxlDomainObjListAdd:
+ * @driver: libxl driver
+ * @def: domain definition
+ * @oldDef: previous domain definition
+ * @live: whether @def is live definition
+ * @flags: an bitwise-OR of virDomainObjListAdd flags
+ *
+ * Add a domain onto the list of domain object and sets its
+ * definition. If @oldDef is not NULL and there was pre-existing
+ * definition it's returned in @oldDef.
+ *
+ * In addition to that, if definition of an existing domain is
+ * changed a MODIFY job is acquired prior to that.
+ *
+ * Returns: domain object pointer on success,
+ * NULL otherwise.
+ */
+virDomainObjPtr
+libxlDomainObjListAdd(libxlDriverPrivatePtr driver,
+ virDomainDefPtr def,
+ virDomainDefPtr *oldDef,
+ bool live,
+ unsigned int flags)
+{
+ virDomainObjPtr vm = NULL;
+
+ if (!(vm = virDomainObjListAdd(driver->domains, def, driver->xmlopt, flags)))
+ return NULL;
+
+ /* At this point, @vm is locked. If it doesn't have any
+ * definition set, then the call above just added it and
+ * there can't be anybody else using the object. It's safe to
+ * just set the definition without acquiring job. */
+ if (!vm->def) {
+ virDomainObjAssignDef(vm, def, live, oldDef);
+ VIR_RETURN_PTR(vm);
+ }
+
+ /* Bad luck. Domain was pre-existing and this call is trying
+ * to update its definition. Modify job MUST be acquired. */
+ if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0) {
+ if (!vm->persistent)
+ virDomainObjListRemove(driver->domains, vm);
+ virDomainObjEndAPI(&vm);
+ return NULL;
+ }
+
+ virDomainObjAssignDef(vm, def, live, oldDef);
+
+ libxlDomainObjEndJob(driver, vm);
+
+ return vm;
+}
+
+
static int
libxlDomainObjInitJob(libxlDomainObjPrivatePtr priv)
{
diff --git a/src/libxl/libxl_domain.h b/src/libxl/libxl_domain.h
index 769ee8ec4d..b5d5127e91 100644
--- a/src/libxl/libxl_domain.h
+++ b/src/libxl/libxl_domain.h
@@ -83,6 +83,13 @@ extern const struct libxl_event_hooks ev_hooks;
int
libxlDomainObjPrivateInitCtx(virDomainObjPtr vm);
+virDomainObjPtr
+libxlDomainObjListAdd(libxlDriverPrivatePtr driver,
+ virDomainDefPtr def,
+ virDomainDefPtr *oldDef,
+ bool live,
+ unsigned int flags);
+
int
libxlDomainObjBeginJob(libxlDriverPrivatePtr driver,
virDomainObjPtr obj,
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 809d298ac1..9c9a30bb90 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -601,12 +601,8 @@ libxlAddDom0(libxlDriverPrivatePtr driver)
if (virUUIDParse("00000000-0000-0000-0000-000000000000", def->uuid) < 0)
goto cleanup;
- if (!(vm = virDomainObjListAdd(driver->domains, def,
- driver->xmlopt,
- 0)))
+ if (!(vm = libxlDomainObjListAdd(driver, def, &oldDef, false, 0)))
goto cleanup;
-
- virDomainObjAssignDef(vm, def, false, &oldDef);
def = NULL;
vm->persistent = 1;
@@ -1030,12 +1026,9 @@ libxlDomainCreateXML(virConnectPtr conn, const char *xml,
if (virDomainCreateXMLEnsureACL(conn, def) < 0)
goto cleanup;
- if (!(vm = virDomainObjListAdd(driver->domains, def,
- driver->xmlopt,
- VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE)))
+ if (!(vm = libxlDomainObjListAdd(driver, def, NULL, true,
+ VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE)))
goto cleanup;
-
- virDomainObjAssignDef(vm, def, true, NULL);
def = NULL;
if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0) {
@@ -1950,12 +1943,9 @@ libxlDomainRestoreFlags(virConnectPtr conn, const char *from,
if (virDomainRestoreFlagsEnsureACL(conn, def) < 0)
goto cleanup;
- if (!(vm = virDomainObjListAdd(driver->domains, def,
- driver->xmlopt,
+ if (!(vm = libxlDomainObjListAdd(driver, def, NULL, true,
VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE)))
goto cleanup;
-
- virDomainObjAssignDef(vm, def, true, NULL);
def = NULL;
if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_MODIFY) < 0) {
@@ -2850,12 +2840,8 @@ libxlDomainDefineXMLFlags(virConnectPtr conn, const char *xml, unsigned int flag
if (virDomainDefineXMLFlagsEnsureACL(conn, def) < 0)
goto cleanup;
- if (!(vm = virDomainObjListAdd(driver->domains, def,
- driver->xmlopt,
- 0)))
+ if (!(vm = libxlDomainObjListAdd(driver, def, &oldDef, false, 0)))
goto cleanup;
-
- virDomainObjAssignDef(vm, def, false, &oldDef);
def = NULL;
vm->persistent = 1;
diff --git a/src/libxl/libxl_migration.c b/src/libxl/libxl_migration.c
index 35403380d0..d0b0142900 100644
--- a/src/libxl/libxl_migration.c
+++ b/src/libxl/libxl_migration.c
@@ -566,12 +566,9 @@ libxlDomainMigrationDstPrepareTunnel3(virConnectPtr dconn,
&mig, &xmlout, &taint_hook) < 0)
goto error;
- if (!(vm = virDomainObjListAdd(driver->domains, *def,
- driver->xmlopt,
- VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE)))
+ if (!(vm = libxlDomainObjListAdd(driver, *def, NULL, true,
+ VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE)))
goto error;
-
- virDomainObjAssignDef(vm, *def, true, NULL);
*def = NULL;
/*
@@ -675,12 +672,9 @@ libxlDomainMigrationDstPrepare(virConnectPtr dconn,
&mig, &xmlout, &taint_hook) < 0)
goto error;
- if (!(vm = virDomainObjListAdd(driver->domains, *def,
- driver->xmlopt,
- VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE)))
+ if (!(vm = libxlDomainObjListAdd(driver, *def, NULL, true,
+ VIR_DOMAIN_OBJ_LIST_ADD_CHECK_LIVE)))
goto error;
-
- virDomainObjAssignDef(vm, *def, true, NULL);
*def = NULL;
/*
--
2.21.0
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