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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 08/15] libxl: introduce helper to initialise Dom0
This small helper is responsible for generating Dom0 JSON config
stub and writing Dom0 xenstore entries. This helpers subsumes two calls
to xenstore-write in xencommons script.
Dom0 UUID is intentionally left untouched, so it is always all
zeros. This makes sure that we don't leak Dom0 stubs across rebooting.
Signed-off-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
change in v3:
move to libxl directory
---
.gitignore | 1 +
tools/hotplug/Linux/init.d/xencommons.in.in | 5 +-
tools/libxl/Makefile | 10 ++-
tools/libxl/xen-init-dom0.c | 120 +++++++++++++++++++++++++++
4 files changed, 132 insertions(+), 4 deletions(-)
create mode 100644 tools/libxl/xen-init-dom0.c
diff --git a/.gitignore b/.gitignore
index 6d725aa..8e34b85 100644
--- a/.gitignore
+++ b/.gitignore
@@ -313,6 +313,7 @@ tools/libxl/testidl.c
tools/libxl/*.pyc
tools/libxl/libxl-save-helper
tools/libxl/test_timedereg
+tools/libxl/xen-init-dom0
tools/blktap2/control/tap-ctl
tools/firmware/etherboot/eb-roms.h
tools/firmware/etherboot/gpxe-git-snapshot.tar.gz
diff --git a/tools/hotplug/Linux/init.d/xencommons.in.in
b/tools/hotplug/Linux/init.d/xencommons.in.in
index b311bb8..1d860d9 100644
--- a/tools/hotplug/Linux/init.d/xencommons.in.in
+++ b/tools/hotplug/Linux/init.d/xencommons.in.in
@@ -90,9 +90,8 @@ do_start () {
exit 1
fi
- echo Setting domain 0 name and domid...
- ${BINDIR}/xenstore-write "/local/domain/0/name" "Domain-0"
- ${BINDIR}/xenstore-write "/local/domain/0/domid" 0
+ echo Setting domain 0 name, domid and JSON config...
+ ${PRIVATE_BINDIR}/xen-init-dom0
fi
echo Starting xenconsoled...
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index bd0db3b..4bee4af 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -110,7 +110,7 @@ LIBXLU_OBJS = libxlu_cfg_y.o libxlu_cfg_l.o libxlu_cfg.o \
libxlu_disk_l.o libxlu_disk.o libxlu_vif.o libxlu_pci.o
$(LIBXLU_OBJS): CFLAGS += $(CFLAGS_libxenctrl) # For xentoollog.h
-CLIENTS = xl testidl libxl-save-helper
+CLIENTS = xl testidl libxl-save-helper xen-init-dom0
CFLAGS_XL += $(CFLAGS_libxenlight)
CFLAGS_XL += -Wshadow
@@ -121,6 +121,10 @@ $(XL_OBJS) $(TEST_PROG_OBJS) _libxl.api-for-check: \
$(XL_OBJS): CFLAGS += $(CFLAGS_XL)
$(XL_OBJS): CFLAGS += -include $(XEN_ROOT)/tools/config.h # libxl_json.h needs
it.
+XEN_INIT_DOM0_OBJS = xen-init-dom0.o
+$(XEN_INIT_DOM0_OBJS): CFLAGS += $(CFLAGS_libxenctrl)
+$(XEN_INIT_DOM0_OBJS): CFLAGS += $(CFLAGS_libxenstore)
+
SAVE_HELPER_OBJS = libxl_save_helper.o _libxl_save_msgs_helper.o
$(SAVE_HELPER_OBJS): CFLAGS += $(CFLAGS_libxenctrl)
@@ -222,6 +226,9 @@ libxlutil.a: $(LIBXLU_OBJS)
xl: $(XL_OBJS) libxlutil.so libxenlight.so
$(CC) $(LDFLAGS) -o $@ $(XL_OBJS) libxlutil.so $(LDLIBS_libxenlight)
$(LDLIBS_libxenctrl) -lyajl $(APPEND_LDFLAGS)
+xen-init-dom0: $(XEN_INIT_DOM0_OBJS) libxenlight.so
+ $(CC) $(LDFLAGS) -o $@ $(XEN_INIT_DOM0_OBJS) $(LDLIBS_libxenstore)
$(LDLIBS_libxenlight) $(LDLIBS_libxenctrl) $(APPEND_LDFLAGS)
+
test_%: test_%.o test_common.o libxlutil.so libxenlight_test.so
$(CC) $(LDFLAGS) -o $@ $^ $(filter-out %libxenlight.so,
$(LDLIBS_libxenlight)) $(LDLIBS_libxenctrl) -lyajl $(APPEND_LDFLAGS)
@@ -239,6 +246,7 @@ install: all
$(INSTALL_DIR) $(DESTDIR)$(BASH_COMPLETION_DIR)
$(INSTALL_DIR) $(DESTDIR)$(PRIVATE_BINDIR)
$(INSTALL_PROG) xl $(DESTDIR)$(SBINDIR)
+ $(INSTALL_PROG) xen-init-dom0 $(DESTDIR)$(PRIVATE_BINDIR)
$(INSTALL_PROG) libxl-save-helper $(DESTDIR)$(PRIVATE_BINDIR)
$(INSTALL_SHLIB) libxenlight.so.$(MAJOR).$(MINOR) $(DESTDIR)$(LIBDIR)
$(SYMLINK_SHLIB) libxenlight.so.$(MAJOR).$(MINOR)
$(DESTDIR)$(LIBDIR)/libxenlight.so.$(MAJOR)
diff --git a/tools/libxl/xen-init-dom0.c b/tools/libxl/xen-init-dom0.c
new file mode 100644
index 0000000..7925d64
--- /dev/null
+++ b/tools/libxl/xen-init-dom0.c
@@ -0,0 +1,120 @@
+#include <err.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <stdio.h>
+
+#include <xenctrl.h>
+#include <xenstore.h>
+#include <libxl.h>
+
+#define DOMNAME_PATH "/local/domain/0/name"
+#define DOMID_PATH "/local/domain/0/domid"
+
+static libxl_ctx *ctx;
+static xentoollog_logger_stdiostream *logger;
+static struct xs_handle *xsh;
+
+static void ctx_alloc(void)
+{
+ if (libxl_ctx_alloc(&ctx, LIBXL_VERSION, 0,
+ (xentoollog_logger *)logger)) {
+ fprintf(stderr, "cannot init libxl context\n");
+ exit(1);
+ }
+ xsh = xs_open(0);
+ if (!xsh) {
+ fprintf(stderr, "cannot open xenstore connection\n");
+ exit(1);
+ }
+}
+
+static void ctx_free(void)
+{
+ if (ctx) {
+ libxl_ctx_free(ctx);
+ ctx = NULL;
+ }
+ if (logger) {
+ xtl_logger_destroy((xentoollog_logger *)logger);
+ logger = NULL;
+ }
+ if (xsh) {
+ xs_close(xsh);
+ xsh = NULL;
+ }
+}
+
+int main(int argc, char **argv)
+{
+ int rc;
+ libxl_domain_config dom0_config;
+ char *domname_string = NULL, *domid_string = NULL;
+ char *json = NULL;;
+
+ logger = xtl_createlogger_stdiostream(stderr, XTL_ERROR, 0);
+ if (!logger) exit(1);
+
+ atexit(ctx_free);
+
+ ctx_alloc();
+
+ libxl_domain_config_init(&dom0_config);
+
+ /* Sanity check: this program can only be run once. */
+ domid_string = xs_read(xsh, XBT_NULL, DOMID_PATH, NULL);
+ domname_string = xs_read(xsh, XBT_NULL, DOMNAME_PATH, NULL);
+ if (domid_string && domname_string) {
+ fprintf(stderr, "Dom0 is already set up\n");
+ rc = 0;
+ goto out;
+ }
+
+ /* Generate stub JSON config. */
+ dom0_config.c_info.type = LIBXL_DOMAIN_TYPE_PV;
+ libxl_domain_build_info_init_type(&dom0_config.b_info,
+ LIBXL_DOMAIN_TYPE_PV);
+
+ json = libxl_domain_config_to_json(ctx, &dom0_config);
+ /* libxl-json format requires the string ends with '\0'. Code
+ * snippet taken from libxl.
+ */
+ rc = libxl_userdata_store(ctx, 0, "libxl-json",
+ (const uint8_t *)json,
+ strlen(json) + 1 /* include '\0' */);
+ if (rc) {
+ fprintf(stderr, "cannot store stub json config for Dom0\n");
+ goto out;
+ }
+
+ /* Write xenstore entries. */
+ if (!xs_write(xsh, XBT_NULL, DOMID_PATH, "0", strlen("0"))) {
+ fprintf(stderr, "cannot set domid for Dom0\n");
+ rc = 1;
+ goto out;
+ }
+
+ if (!xs_write(xsh, XBT_NULL, DOMNAME_PATH, "Domain-0",
+ strlen("Domain-0"))) {
+ fprintf(stderr, "cannot set domain name for Dom0\n");
+ rc = 1;
+ goto out;
+ }
+
+ printf("Done setting up Dom0\n");
+
+out:
+ libxl_domain_config_dispose(&dom0_config);
+ free(domid_string);
+ free(domname_string);
+ free(json);
+ return rc;
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
1.7.10.4
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