From: Luca Miccio
Add an example application that can be run in dom0 to complete the
dom0less domains initialization so that they can get access to xenstore
and use PV drivers.
The application sets XS_CONNECTION_STATE_RECONNECTING on the xenstore
page before calling xs_introduce_domain to signal that the connection is
not ready yet to be used. XS_CONNECTION_STATE_RECONNECTING is reset soon
after by xenstored.
Signed-off-by: Luca Miccio
Signed-off-by: Stefano Stabellini
CC: Wei Liu
CC: Anthony PERARD
CC: Juergen Gross
---
Changes in v5:
- set XS_CONNECTION_STATE_RECONNECTING before xs_introduce_domain
Changes in v4:
- only alloc xs page (no other magic pages)
- add xenstore permissions
- check all return values
- rename restore_xenstore to create_xenstore
- set target_memkb
- set start_time properly
- close xs transaction on error
- call xc_dom_gnttab_seed instead of xc_dom_gnttab_init
- xs_open instead of xs_daemon_open
Changes in v3:
- handle xenstore errors
- add an in-code comment about xenstore entries
- less verbose output
- clean-up error path in main
Changes in v2:
- do not set HVM_PARAM_STORE_EVTCHN twice
- rename restore_xenstore to create_xenstore
- increase maxmem
connection reconnecting
---
tools/helpers/Makefile| 13 ++
tools/helpers/init-dom0less.c | 341 ++
2 files changed, 354 insertions(+)
create mode 100644 tools/helpers/init-dom0less.c
diff --git a/tools/helpers/Makefile b/tools/helpers/Makefile
index 7f6c422440..8d78ab1e90 100644
--- a/tools/helpers/Makefile
+++ b/tools/helpers/Makefile
@@ -10,6 +10,9 @@ ifeq ($(CONFIG_Linux),y)
ifeq ($(CONFIG_X86),y)
PROGS += init-xenstore-domain
endif
+ifeq ($(CONFIG_ARM),y)
+PROGS += init-dom0less
+endif
endif
XEN_INIT_DOM0_OBJS = xen-init-dom0.o init-dom-json.o
@@ -26,6 +29,13 @@ $(INIT_XENSTORE_DOMAIN_OBJS): CFLAGS += $(CFLAGS_libxenstore)
$(INIT_XENSTORE_DOMAIN_OBJS): CFLAGS += $(CFLAGS_libxenlight)
$(INIT_XENSTORE_DOMAIN_OBJS): CFLAGS += -include $(XEN_ROOT)/tools/config.h
+INIT_DOM0LESS_OBJS = init-dom0less.o init-dom-json.o
+$(INIT_DOM0LESS_OBJS): CFLAGS += $(CFLAGS_libxentoollog)
+$(INIT_DOM0LESS_OBJS): CFLAGS += $(CFLAGS_libxenstore)
+$(INIT_DOM0LESS_OBJS): CFLAGS += $(CFLAGS_libxenlight)
+$(INIT_DOM0LESS_OBJS): CFLAGS += $(CFLAGS_libxenctrl)
+$(INIT_DOM0LESS_OBJS): CFLAGS += $(CFLAGS_libxenevtchn)
+
.PHONY: all
all: $(PROGS)
@@ -35,6 +45,9 @@ xen-init-dom0: $(XEN_INIT_DOM0_OBJS)
init-xenstore-domain: $(INIT_XENSTORE_DOMAIN_OBJS)
$(CC) $(LDFLAGS) -o $@ $(INIT_XENSTORE_DOMAIN_OBJS)
$(LDLIBS_libxentoollog) $(LDLIBS_libxenstore) $(LDLIBS_libxenctrl)
$(LDLIBS_libxenguest) $(LDLIBS_libxenlight) $(APPEND_LDFLAGS)
+init-dom0less: $(INIT_DOM0LESS_OBJS)
+ $(CC) $(LDFLAGS) -o $@ $(INIT_DOM0LESS_OBJS) $(LDLIBS_libxenctrl)
$(LDLIBS_libxenevtchn) $(LDLIBS_libxentoollog) $(LDLIBS_libxenstore)
$(LDLIBS_libxenlight) $(LDLIBS_libxenguest) $(LDLIBS_libxenforeignmemory)
$(APPEND_LDFLAGS)
+
.PHONY: install
install: all
$(INSTALL_DIR) $(DESTDIR)$(LIBEXEC_BIN)
diff --git a/tools/helpers/init-dom0less.c b/tools/helpers/init-dom0less.c
new file mode 100644
index 00..a99398e928
--- /dev/null
+++ b/tools/helpers/init-dom0less.c
@@ -0,0 +1,341 @@
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+#include
+
+#include "init-dom-json.h"
+
+#define XS_CONNECTION_STATE_OFFSET (2068/4)
+#define XS_CONNECTION_STATE_RECONNECTING 0x1
+#define XENSTORE_PFN_OFFSET 1
+#define STR_MAX_LENGTH 64
+
+static int alloc_xs_page(struct xc_interface_core *xch,
+ libxl_dominfo *info,
+ uint64_t *xenstore_pfn)
+{
+int rc;
+const xen_pfn_t base = GUEST_MAGIC_BASE >> XC_PAGE_SHIFT;
+xen_pfn_t p2m = (GUEST_MAGIC_BASE >> XC_PAGE_SHIFT) + XENSTORE_PFN_OFFSET;
+
+rc = xc_domain_setmaxmem(xch, info->domid,
+ info->max_memkb + (XC_PAGE_SIZE/1024));
+if (rc < 0)
+return rc;
+
+rc = xc_domain_populate_physmap_exact(xch, info->domid, 1, 0, 0, );
+if (rc < 0)
+return rc;
+
+*xenstore_pfn = base + XENSTORE_PFN_OFFSET;
+rc = xc_clear_domain_page(xch, info->domid, *xenstore_pfn);
+if (rc < 0)
+return rc;
+
+return 0;
+}
+
+static bool do_xs_write_dom(struct xs_handle *xsh, xs_transaction_t t,
+domid_t domid, char *path, char *val)
+{
+char full_path[STR_MAX_LENGTH];
+struct xs_permissions perms[2];
+
+perms[0].id = domid;
+perms[0].perms = XS_PERM_NONE;
+perms[1].id = 0;
+perms[1].perms = XS_PERM_READ;
+
+if (snprintf(full_path, STR_MAX_LENGTH,
+ "/local/domain/%u/%s", domid, path) < 0)
+return false;
+if (!xs_write(xsh, t, full_path, val, strlen(val)))
+return false;
+return xs_set_permissions(xsh, t, full_path, perms, 2);
+}
+
+static bool do_xs_write_libxl(struct xs_handle *xsh,
