[Xen-devel] [PATCH v1 5/6] xen: add /buildinfo/config entry to hypervisor filesystem

[Juergen Gross <jgross@xxxxxxxx>]

Add the /buildinfo/config entry to the hypervisor filesystem. This
entry contains the .config file used to build the hypervisor.

Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
---
 .gitignore                   |  2 ++
 docs/misc/hypfs-paths.pandoc |  9 +++++++++
 xen/common/Makefile          |  9 +++++++++
 xen/common/hypfs.c           | 17 +++++++++++++++++
 xen/include/xen/kernel.h     |  2 ++
 xen/tools/Makefile           |  9 +++++++--
 xen/tools/bin2c.c            | 28 ++++++++++++++++++++++++++++
 7 files changed, 74 insertions(+), 2 deletions(-)
 create mode 100644 xen/tools/bin2c.c

diff --git a/.gitignore b/.gitignore
index 954c1da2cb..16dfbb8302 100644
--- a/.gitignore
+++ b/.gitignore
@@ -295,6 +295,7 @@ xen/arch/*/efi/boot.c
 xen/arch/*/efi/compat.c
 xen/arch/*/efi/efi.h
 xen/arch/*/efi/runtime.c
+xen/common/config_data.c
 xen/include/headers*.chk
 xen/include/asm
 xen/include/asm-*/asm-offsets.h
@@ -312,6 +313,7 @@ xen/test/livepatch/xen_bye_world.livepatch
 xen/test/livepatch/xen_hello_world.livepatch
 xen/test/livepatch/xen_nop.livepatch
 xen/test/livepatch/xen_replace_world.livepatch
+xen/tools/bin2c
 xen/tools/kconfig/.tmp_gtkcheck
 xen/tools/kconfig/.tmp_qtcheck
 xen/tools/symbols
diff --git a/docs/misc/hypfs-paths.pandoc b/docs/misc/hypfs-paths.pandoc
index 2fe5455e6f..56ebdcd8be 100644
--- a/docs/misc/hypfs-paths.pandoc
+++ b/docs/misc/hypfs-paths.pandoc
@@ -53,3 +53,12 @@ tags enclosed in square brackets.
 #### /
 
 The root of the hypervisor file system.
+
+#### /buildinfo/
+
+A directory containing static information generated while building the
+hypervisor.
+
+#### /buildinfo/config = STRING
+
+The contents of the `xen/.config` file at the time of the hypervisor build.
diff --git a/xen/common/Makefile b/xen/common/Makefile
index a3f66aa0c0..de7e0fa645 100644
--- a/xen/common/Makefile
+++ b/xen/common/Makefile
@@ -1,6 +1,7 @@
 obj-$(CONFIG_ARGO) += argo.o
 obj-y += bitmap.o
 obj-y += bsearch.o
+obj-y += config_data.o
 obj-$(CONFIG_CORE_PARKING) += core_parking.o
 obj-y += cpu.o
 obj-y += cpupool.o
@@ -79,3 +80,11 @@ subdir-$(CONFIG_UBSAN) += ubsan
 
 subdir-$(CONFIG_NEEDS_LIBELF) += libelf
 subdir-$(CONFIG_HAS_DEVICE_TREE) += libfdt
+
+config_data.c: ../.config
+       ( echo "char xen_config_data[] ="; \
+         ../tools/bin2c <$<; \
+         echo ";" ) > $@
+
+clean::
+       rm config_data.c 2>/dev/null || true
diff --git a/xen/common/hypfs.c b/xen/common/hypfs.c
index 7d9595dfa7..11b7b36e56 100644
--- a/xen/common/hypfs.c
+++ b/xen/common/hypfs.c
@@ -25,6 +25,10 @@ static struct hypfs_entry hypfs_root_entry = {
     .dir = &hypfs_root,
 };
 
+static struct hypfs_dir hypfs_buildinfo = {
+    .list = LIST_HEAD_INIT(hypfs_buildinfo.list),
+};
+
 static int hypfs_add_entry(struct hypfs_dir *parent, struct hypfs_entry *new)
 {
     int ret = -ENOENT;
@@ -312,3 +316,16 @@ long do_hypfs_op(unsigned int cmd,
 
     return ret;
 }
+
+static int __init hypfs_init(void)
+{
+    int ret;
+
+    ret = hypfs_new_dir(&hypfs_root, "buildinfo", &hypfs_buildinfo);
+    BUG_ON(ret);
+    ret = hypfs_new_entry_string(&hypfs_buildinfo, "config", xen_config_data);
+    BUG_ON(ret);
+
+    return 0;
+}
+__initcall(hypfs_init);
diff --git a/xen/include/xen/kernel.h b/xen/include/xen/kernel.h
index 548b64da9f..5ff2280b0f 100644
--- a/xen/include/xen/kernel.h
+++ b/xen/include/xen/kernel.h
@@ -100,5 +100,7 @@ extern enum system_state {
 
 bool_t is_active_kernel_text(unsigned long addr);
 
+extern char xen_config_data[];
+
 #endif /* _LINUX_KERNEL_H */
 
diff --git a/xen/tools/Makefile b/xen/tools/Makefile
index e940939d61..cd2bbbf647 100644
--- a/xen/tools/Makefile
+++ b/xen/tools/Makefile
@@ -1,13 +1,18 @@
 
 include $(XEN_ROOT)/Config.mk
 
+PROGS = symbols bin2c
+
 .PHONY: default
 default:
-       $(MAKE) symbols
+       $(MAKE) $(PROGS)
 
 .PHONY: clean
 clean:
-       rm -f *.o symbols
+       rm -f *.o $(PROGS)
 
 symbols: symbols.c
        $(HOSTCC) $(HOSTCFLAGS) -o $@ $<
+
+bin2c: bin2c.c
+       $(HOSTCC) $(HOSTCFLAGS) -o $@ $<
diff --git a/xen/tools/bin2c.c b/xen/tools/bin2c.c
new file mode 100644
index 0000000000..c332399b70
--- /dev/null
+++ b/xen/tools/bin2c.c
@@ -0,0 +1,28 @@
+/*
+ * Unloved program to convert a binary on stdin to a C include on stdout
+ *
+ * Jan 1999 Matt Mackall <mpm@xxxxxxxxxxx>
+ *
+ * This software may be used and distributed according to the terms
+ * of the GNU General Public License, incorporated herein by reference.
+ */
+
+#include <stdio.h>
+
+int main(int argc, char *argv[])
+{
+       int ch, total = 0;
+
+       do {
+               printf("\t\"");
+               while ((ch = getchar()) != EOF) {
+                       total++;
+                       printf("\\x%02x", ch);
+                       if (total % 16 == 0)
+                               break;
+               }
+               printf("\"\n");
+       } while (ch != EOF);
+
+       return 0;
+}
-- 
2.16.4


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