libxl: use LIBXL_API_VERSION 0x040200

To ensure the libvirt libxl driver will build with future versions
of Xen where the libxl API may change in incompatible ways,
explicitly use LIBXL_API_VERSION 0x040200. The libxl driver
does use new libxl APIs that have been added since Xen 4.2, but
currently it does not make use of any changes made to existing
APIs such as libxl_domain_create_restore or libxl_set_vcpuaffinity.
The version can be bumped if/when the libxl driver consumes the
changed APIs.

Further details can be found in the following discussion thread

https://www.redhat.com/archives/libvir-list/2016-April/msg00178.html
Signed-off-by: Jim Fehlig <jfehlig@suse.com>

diff --git a/configure.ac b/configure.ac
index 80e720a0f2030a79a472cb97cf2e79b5575442f4..450f02cc13dd3e157a895975ee72d92b3d43c8c5 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -916,6 +916,10 @@ if test "$with_libxl" != "no" ; then
     fi
 fi
 
+# Until there is a need to use enhancements of libxl APIs such as
+# libxl_domain_create_restore and libxl_set_vcpuaffinity, stick with
+# the APIs as defined in libxl API version 4.2.0.
+LIBXL_CFLAGS="$LIBXL_CFLAGS -DLIBXL_API_VERSION=0x040200"
 LIBS="$old_LIBS"
 CFLAGS="$old_CFLAGS"
 

diff --git a/src/libxl/libxl_conf.h b/src/libxl/libxl_conf.h
index 3c0eafb043b3bc066084e9ddbc1d0439ff7630f0..24e29116f2ef7b103ccb852262c3004a18a530e4 100644 (file)
--- a/src/libxl/libxl_conf.h
+++ b/src/libxl/libxl_conf.h
@@ -69,18 +69,6 @@
 # endif
 
 
-/* libxl interface for setting VCPU affinity changed in 4.5. In fact, a new
- * parameter has been added, representative of 'VCPU soft affinity'. If one
- * does not care about it (and that's libvirt case), passing NULL is the
- * right thing to do. To mark that change, LIBXL_HAVE_VCPUINFO_SOFT_AFFINITY
- * is defined. */
-# ifdef LIBXL_HAVE_VCPUINFO_SOFT_AFFINITY
-#  define libxl_set_vcpuaffinity(ctx, domid, vcpuid, map) \
-    libxl_set_vcpuaffinity((ctx), (domid), (vcpuid), (map), NULL)
-#  define libxl_set_vcpuaffinity_all(ctx, domid, max_vcpus, map) \
-    libxl_set_vcpuaffinity_all((ctx), (domid), (max_vcpus), (map), NULL)
-# endif
-
 typedef struct _libxlDriverPrivate libxlDriverPrivate;
 typedef libxlDriverPrivate *libxlDriverPrivatePtr;
 

diff --git a/src/libxl/libxl_domain.c b/src/libxl/libxl_domain.c
index 86fb7132bed9e7207a23dd0f39a39cb0c160ac0f..14a900c9f9fef5f3d33ef9fe8a1d6cbf73e0b749 100644 (file)
--- a/src/libxl/libxl_domain.c
+++ b/src/libxl/libxl_domain.c
@@ -1026,9 +1026,6 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
     int managed_save_fd = -1;
     libxlDomainObjPrivatePtr priv = vm->privateData;
     libxlDriverConfigPtr cfg;
-#ifdef LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS
-    libxl_domain_restore_params params;
-#endif
     virHostdevManagerPtr hostdev_mgr = driver->hostdevMgr;
     libxl_asyncprogress_how aop_console_how;
 
@@ -1118,20 +1115,8 @@ libxlDomainStart(libxlDriverPrivatePtr driver, virDomainObjPtr vm,
         ret = libxl_domain_create_new(cfg->ctx, &d_config,
                                       &domid, NULL, &aop_console_how);
     } else {
-#if defined(LIBXL_HAVE_DOMAIN_CREATE_RESTORE_SEND_BACK_FD)
-        params.checkpointed_stream = 0;
-        ret = libxl_domain_create_restore(cfg->ctx, &d_config, &domid,
-                                          restore_fd, -1, &params, NULL,
-                                          &aop_console_how);
-#elif defined(LIBXL_HAVE_DOMAIN_CREATE_RESTORE_PARAMS)
-        params.checkpointed_stream = 0;
-        ret = libxl_domain_create_restore(cfg->ctx, &d_config, &domid,
-                                          restore_fd, &params, NULL,
-                                          &aop_console_how);
-#else
         ret = libxl_domain_create_restore(cfg->ctx, &d_config, &domid,
                                           restore_fd, NULL, &aop_console_how);
-#endif
     }
     virObjectLock(vm);