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[Xen-devel] [PATCH v3 10/18] livepatch: Move test-cases to their own sub-directory in test.

So they can be shared with ARM64 (but not yet, so they
are only built on x86).

No functional change.

We also need to tweak the MAINTAINERS and .gitignore file.

Also we need to update SUBDIRS to include the new 'test'
directory so 'cscope' can show the example livepatches.

Acked-by: Jan Beulich <jbeulich@xxxxxxxx> [for directory]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>

---
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Julien Grall <julien.grall@xxxxxxx>
Cc: Jan Beulich <jbeulich@xxxxxxxx>
Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>

v1: First submission
v2: Move to test/livepatch per Jan's recommendation
v3: Sort MAINTAINERS for livepatch.
    Add Jan's Acked-by.
    Added on the SUBDIRS the 'test' directory
    Change title of patch (common-> own sub-directory)
---
 .gitignore                                  |  8 +--
 MAINTAINERS                                 |  1 +
 xen/Makefile                                |  5 +-
 xen/arch/arm/Makefile                       |  3 -
 xen/arch/x86/Makefile                       |  5 --
 xen/arch/x86/test/Makefile                  | 85 -----------------------------
 xen/arch/x86/test/xen_bye_world.c           | 34 ------------
 xen/arch/x86/test/xen_bye_world_func.c      | 22 --------
 xen/arch/x86/test/xen_hello_world.c         | 63 ---------------------
 xen/arch/x86/test/xen_hello_world_func.c    | 39 -------------
 xen/arch/x86/test/xen_replace_world.c       | 33 -----------
 xen/arch/x86/test/xen_replace_world_func.c  | 22 --------
 xen/test/Makefile                           |  9 +++
 xen/test/livepatch/Makefile                 | 85 +++++++++++++++++++++++++++++
 xen/test/livepatch/xen_bye_world.c          | 34 ++++++++++++
 xen/test/livepatch/xen_bye_world_func.c     | 22 ++++++++
 xen/test/livepatch/xen_hello_world.c        | 63 +++++++++++++++++++++
 xen/test/livepatch/xen_hello_world_func.c   | 39 +++++++++++++
 xen/test/livepatch/xen_replace_world.c      | 33 +++++++++++
 xen/test/livepatch/xen_replace_world_func.c | 22 ++++++++
 20 files changed, 315 insertions(+), 312 deletions(-)
 delete mode 100644 xen/arch/x86/test/Makefile
 delete mode 100644 xen/arch/x86/test/xen_bye_world.c
 delete mode 100644 xen/arch/x86/test/xen_bye_world_func.c
 delete mode 100644 xen/arch/x86/test/xen_hello_world.c
 delete mode 100644 xen/arch/x86/test/xen_hello_world_func.c
 delete mode 100644 xen/arch/x86/test/xen_replace_world.c
 delete mode 100644 xen/arch/x86/test/xen_replace_world_func.c
 create mode 100644 xen/test/Makefile
 create mode 100644 xen/test/livepatch/Makefile
 create mode 100644 xen/test/livepatch/xen_bye_world.c
 create mode 100644 xen/test/livepatch/xen_bye_world_func.c
 create mode 100644 xen/test/livepatch/xen_hello_world.c
 create mode 100644 xen/test/livepatch/xen_hello_world_func.c
 create mode 100644 xen/test/livepatch/xen_replace_world.c
 create mode 100644 xen/test/livepatch/xen_replace_world_func.c

diff --git a/.gitignore b/.gitignore
index cc64fc9..eeabe0b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -254,10 +254,6 @@ xen/arch/x86/efi.lds
 xen/arch/x86/efi/check.efi
 xen/arch/x86/efi/disabled
 xen/arch/x86/efi/mkreloc
-xen/arch/x86/test/config.h
-xen/arch/x86/test/xen_hello_world.livepatch
-xen/arch/x86/test/xen_bye_world.livepatch
-xen/arch/x86/test/xen_replace_world.livepatch
 xen/arch/*/efi/boot.c
 xen/arch/*/efi/compat.c
 xen/arch/*/efi/efi.h
@@ -274,6 +270,10 @@ xen/include/public/public
 xen/include/xen/*.new
 xen/include/xen/acm_policy.h
 xen/include/xen/compile.h
+xen/test/livepatch/config.h
+xen/test/livepatch/xen_bye_world.livepatch
+xen/test/livepatch/xen_hello_world.livepatch
+xen/test/livepatch/xen_replace_world.livepatch
 xen/tools/kconfig/.tmp_gtkcheck
 xen/tools/kconfig/.tmp_qtcheck
 xen/tools/symbols
diff --git a/MAINTAINERS b/MAINTAINERS
index ae0b6bc..edc8603 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -272,6 +272,7 @@ F:  xen/arch/*/livepatch*
 F:  xen/arch/*/*/livepatch*
 F:  xen/common/livepatch*
 F:  xen/include/xen/livepatch*
+F:  xen/test/livepatch/*
 
 MACHINE CHECK (MCA) & RAS
 M:     Christoph Egger <chegger@xxxxxxxxx>
diff --git a/xen/Makefile b/xen/Makefile
index 012509b..e989a20 100644
--- a/xen/Makefile
+++ b/xen/Makefile
@@ -80,7 +80,7 @@ _install: $(TARGET)$(CONFIG_XEN_INSTALL_SUFFIX)
 
 .PHONY: _tests
 _tests:
-       $(MAKE) -f $(BASEDIR)/Rules.mk -C arch/$(TARGET_ARCH) tests
+       $(MAKE) -f $(BASEDIR)/Rules.mk -C test tests
 
 .PHONY: _uninstall
 _uninstall: D=$(DESTDIR)
@@ -114,6 +114,7 @@ _clean: delete-unfresh-files
        $(MAKE) -f $(BASEDIR)/Rules.mk -C xsm clean
        $(MAKE) -f $(BASEDIR)/Rules.mk -C crypto clean
        $(MAKE) -f $(BASEDIR)/Rules.mk -C arch/$(TARGET_ARCH) clean
+       $(MAKE) -f $(BASEDIR)/Rules.mk -C test clean
        $(MAKE) -f $(BASEDIR)/tools/kconfig/Makefile.kconfig ARCH=$(ARCH) 
SRCARCH=$(SRCARCH) clean
        find . \( -name "*.o" -o -name ".*.d" \) -exec rm -f {} \;
        rm -f include/asm $(TARGET) $(TARGET).gz $(TARGET).efi 
$(TARGET).efi.map $(TARGET)-syms $(TARGET)-syms.map *~ core
@@ -189,7 +190,7 @@ include/asm-$(TARGET_ARCH)/asm-offsets.h: 
arch/$(TARGET_ARCH)/asm-offsets.s
          echo ""; \
          echo "#endif") <$< >$@
 
-SUBDIRS = xsm arch/$(TARGET_ARCH) common drivers
+SUBDIRS = xsm arch/$(TARGET_ARCH) common drivers test
 define all_sources
     ( find include/asm-$(TARGET_ARCH) -name '*.h' -print; \
       find include -name 'asm-*' -prune -o -name '*.h' -print; \
diff --git a/xen/arch/arm/Makefile b/xen/arch/arm/Makefile
index c3ce5a3..516e0af 100644
--- a/xen/arch/arm/Makefile
+++ b/xen/arch/arm/Makefile
@@ -74,9 +74,6 @@ ifeq ($(CONFIG_ARM_64),y)
        ln -sf $(notdir $@)  ../../$(notdir $@).efi
 endif
 
-.PHONY: tests
-tests:
-
 $(TARGET).axf: $(TARGET)-syms
        # XXX: VE model loads by VMA so instead of
        # making a proper ELF we link with LMA == VMA and adjust crudely
diff --git a/xen/arch/x86/Makefile b/xen/arch/x86/Makefile
index d3875c5..931917d 100644
--- a/xen/arch/x86/Makefile
+++ b/xen/arch/x86/Makefile
@@ -93,10 +93,6 @@ $(TARGET): $(TARGET)-syms $(efi-y) boot/mkelf32
        ./boot/mkelf32 $(notes_phdrs) $(TARGET)-syms $(TARGET) 0x100000 \
        `$(NM) -nr $(TARGET)-syms | head -n 1 | sed -e 's/^\([^ ]*\).*/0x\1/'`
 
-.PHONY: tests
-tests:
-       $(MAKE) -f $(BASEDIR)/Rules.mk -C test livepatch
-
 ALL_OBJS := $(BASEDIR)/arch/x86/boot/built_in.o 
$(BASEDIR)/arch/x86/efi/built_in.o $(ALL_OBJS)
 
 ifeq ($(lto),y)
@@ -226,4 +222,3 @@ clean::
        rm -f $(BASEDIR)/.xen.efi.[0-9]* efi/*.o efi/.*.d efi/*.efi 
efi/disabled efi/mkreloc
        rm -f boot/reloc.S boot/reloc.lnk boot/reloc.bin
        rm -f note.o
-       $(MAKE) -f $(BASEDIR)/Rules.mk -C test clean
diff --git a/xen/arch/x86/test/Makefile b/xen/arch/x86/test/Makefile
deleted file mode 100644
index 23dff1d..0000000
--- a/xen/arch/x86/test/Makefile
+++ /dev/null
@@ -1,85 +0,0 @@
-include $(XEN_ROOT)/Config.mk
-
-CODE_ADDR=$(shell nm --defined $(1) | grep $(2) | awk '{print "0x"$$1}')
-CODE_SZ=$(shell nm --defined -S $(1) | grep $(2) | awk '{ print "0x"$$2}')
-
-.PHONY: default
-
-LIVEPATCH := xen_hello_world.livepatch
-LIVEPATCH_BYE := xen_bye_world.livepatch
-LIVEPATCH_REPLACE := xen_replace_world.livepatch
-
-default: livepatch
-
-install: livepatch
-       $(INSTALL_DATA) $(LIVEPATCH) $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH)
-       $(INSTALL_DATA) $(LIVEPATCH_BYE) $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_BYE)
-       $(INSTALL_DATA) $(LIVEPATCH_REPLACE) 
$(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_REPLACE)
-uninstall:
-       rm -f $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH)
-       rm -f $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_BYE)
-       rm -f $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_REPLACE)
-
-.PHONY: clean
-clean::
-       rm -f *.o .*.o.d *.livepatch config.h
-
-#
-# To compute these values we need the binary files: xen-syms
-# and xen_hello_world_func.o to be already compiled.
-#
-.PHONY: config.h
-config.h: OLD_CODE_SZ=$(call CODE_SZ,$(BASEDIR)/xen-syms,xen_extra_version)
-config.h: NEW_CODE_SZ=$(call CODE_SZ,$<,xen_hello_world)
-config.h: xen_hello_world_func.o
-       (set -e; \
-        echo "#define NEW_CODE_SZ $(NEW_CODE_SZ)"; \
-        echo "#define OLD_CODE_SZ $(OLD_CODE_SZ)") > $@
-
-xen_hello_world.o: config.h
-
-.PHONY: $(LIVEPATCH)
-$(LIVEPATCH): xen_hello_world_func.o xen_hello_world.o note.o
-       $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(LIVEPATCH) $^
-
-#
-# This target is only accessible if CONFIG_LIVEPATCH is defined, which
-# depends on $(build_id_linker) being available. Hence we do not
-# need any checks.
-#
-# N.B. The reason we don't use arch/x86/note.o is that it may
-# not be built (it is for EFI builds), and that we do not have
-# the note.o.bin to muck with (as it gets deleted)
-#
-.PHONY: note.o
-note.o:
-       $(OBJCOPY) -O binary --only-section=.note.gnu.build-id 
$(BASEDIR)/xen-syms $@.bin
-       $(OBJCOPY) -I binary -O elf64-x86-64 -B i386:x86-64 \
-                  --rename-section=.data=.livepatch.depends -S $@.bin $@
-       rm -f $@.bin
-
-#
-# Extract the build-id of the xen_hello_world.livepatch
-# (which xen_bye_world will depend on).
-#
-.PHONY: hello_world_note.o
-hello_world_note.o: $(LIVEPATCH)
-       $(OBJCOPY) -O binary --only-section=.note.gnu.build-id $(LIVEPATCH) 
$@.bin
-       $(OBJCOPY)  -I binary -O elf64-x86-64 -B i386:x86-64 \
-                  --rename-section=.data=.livepatch.depends -S $@.bin $@
-       rm -f $@.bin
-
-xen_bye_world.o: config.h
-
-.PHONY: $(LIVEPATCH_BYE)
-$(LIVEPATCH_BYE): xen_bye_world_func.o xen_bye_world.o hello_world_note.o
-       $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(LIVEPATCH_BYE) $^
-
-xen_replace_world.o: config.h
-
-.PHONY: $(LIVEPATCH_REPLACE)
-$(LIVEPATCH_REPLACE): xen_replace_world_func.o xen_replace_world.o note.o
-       $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(LIVEPATCH_REPLACE) $^
-
-.PHONY: livepatch
-livepatch: $(LIVEPATCH) $(LIVEPATCH_BYE) $(LIVEPATCH_REPLACE)
diff --git a/xen/arch/x86/test/xen_bye_world.c 
b/xen/arch/x86/test/xen_bye_world.c
deleted file mode 100644
index b75e0b1..0000000
--- a/xen/arch/x86/test/xen_bye_world.c
+++ /dev/null
@@ -1,34 +0,0 @@
-/*
- * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
- *
- */
-
-#include "config.h"
-#include <xen/lib.h>
-#include <xen/types.h>
-#include <xen/version.h>
-#include <xen/livepatch.h>
-
-#include <public/sysctl.h>
-
-static char bye_world_patch_this_fnc[] = "xen_extra_version";
-extern const char *xen_bye_world(void);
-
-struct livepatch_func __section(".livepatch.funcs") livepatch_xen_bye_world = {
-    .version = LIVEPATCH_PAYLOAD_VERSION,
-    .name = bye_world_patch_this_fnc,
-    .new_addr = xen_bye_world,
-    .old_addr = xen_extra_version,
-    .new_size = NEW_CODE_SZ,
-    .old_size = OLD_CODE_SZ,
-};
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/arch/x86/test/xen_bye_world_func.c 
b/xen/arch/x86/test/xen_bye_world_func.c
deleted file mode 100644
index 32ef341..0000000
--- a/xen/arch/x86/test/xen_bye_world_func.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
- *
- */
-
-#include <xen/types.h>
-
-/* Our replacement function for xen_hello_world. */
-const char *xen_bye_world(void)
-{
-    return "Bye World!";
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/arch/x86/test/xen_hello_world.c 
b/xen/arch/x86/test/xen_hello_world.c
deleted file mode 100644
index 472fe2e..0000000
--- a/xen/arch/x86/test/xen_hello_world.c
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
- *
- */
-
-#include "config.h"
-#include <xen/lib.h>
-#include <xen/types.h>
-#include <xen/version.h>
-#include <xen/livepatch.h>
-#include <xen/livepatch_payload.h>
-
-#include <public/sysctl.h>
-
-static char hello_world_patch_this_fnc[] = "xen_extra_version";
-extern const char *xen_hello_world(void);
-/*
- * .bss is only cleared once - during upload. Apply/revert/apply will result
- * in cnt to have a non-zero value (see the hooks below).
- */
-static unsigned int cnt;
-
-static void apply_hook(void)
-{
-    printk(KERN_DEBUG "Hook executing.\n");
-}
-
-static void revert_hook(void)
-{
-    printk(KERN_DEBUG "Hook unloaded.\n");
-}
-
-static void  hi_func(void)
-{
-    printk(KERN_DEBUG "%s: Hi! (called %u times)\n", __func__, ++cnt);
-};
-
-LIVEPATCH_LOAD_HOOK(apply_hook);
-LIVEPATCH_UNLOAD_HOOK(revert_hook);
-
-/* Imbalance here. Two load and three unload. */
-
-LIVEPATCH_LOAD_HOOK(hi_func);
-LIVEPATCH_UNLOAD_HOOK(hi_func);
-
-struct livepatch_func __section(".livepatch.funcs") livepatch_xen_hello_world 
= {
-    .version = LIVEPATCH_PAYLOAD_VERSION,
-    .name = hello_world_patch_this_fnc,
-    .new_addr = xen_hello_world,
-    .old_addr = xen_extra_version,
-    .new_size = NEW_CODE_SZ,
-    .old_size = OLD_CODE_SZ,
-};
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/arch/x86/test/xen_hello_world_func.c 
b/xen/arch/x86/test/xen_hello_world_func.c
deleted file mode 100644
index 03d6b84..0000000
--- a/xen/arch/x86/test/xen_hello_world_func.c
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
- *
- */
-
-#include <xen/types.h>
-
-#include <asm/alternative.h>
-#include <asm/nops.h>
-#include <asm/uaccess.h>
-
-static unsigned long *non_canonical_addr = (unsigned long 
*)0xdead000000000000ULL;
-
-/* Our replacement function for xen_extra_version. */
-const char *xen_hello_world(void)
-{
-    unsigned long tmp;
-    int rc;
-
-    alternative(ASM_NOP8, ASM_NOP1, X86_FEATURE_LM);
-    /*
-     * Any BUG, or WARN_ON will contain symbol and payload name. Furthermore
-     * exceptions will be caught and processed properly.
-     */
-    rc = __get_user(tmp, non_canonical_addr);
-    BUG_ON(rc != -EFAULT);
-
-    return "Hello World";
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/arch/x86/test/xen_replace_world.c 
b/xen/arch/x86/test/xen_replace_world.c
deleted file mode 100644
index a2a221a..0000000
--- a/xen/arch/x86/test/xen_replace_world.c
+++ /dev/null
@@ -1,33 +0,0 @@
-/*
- * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
- *
- */
-
-#include "config.h"
-#include <xen/lib.h>
-#include <xen/types.h>
-#include <xen/livepatch.h>
-
-#include <public/sysctl.h>
-
-static char xen_replace_world_name[] = "xen_extra_version";
-extern const char *xen_replace_world(void);
-
-struct livepatch_func __section(".livepatch.funcs") 
livepatch_xen_replace_world = {
-    .version = LIVEPATCH_PAYLOAD_VERSION,
-    .name = xen_replace_world_name,
-    .old_addr = 0, /* Forces the hypervisor to lookup .name */
-    .new_addr = xen_replace_world,
-    .new_size = NEW_CODE_SZ,
-    .old_size = OLD_CODE_SZ,
-};
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/arch/x86/test/xen_replace_world_func.c 
b/xen/arch/x86/test/xen_replace_world_func.c
deleted file mode 100644
index afb5cda..0000000
--- a/xen/arch/x86/test/xen_replace_world_func.c
+++ /dev/null
@@ -1,22 +0,0 @@
-/*
- * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
- *
- */
-
-#include <xen/types.h>
-
-/* Our replacement function for xen_hello_world. */
-const char *xen_replace_world(void)
-{
-    return "Hello Again World!";
-}
-
-/*
- * Local variables:
- * mode: C
- * c-file-style: "BSD"
- * c-basic-offset: 4
- * tab-width: 4
- * indent-tabs-mode: nil
- * End:
- */
diff --git a/xen/test/Makefile b/xen/test/Makefile
new file mode 100644
index 0000000..8c53040
--- /dev/null
+++ b/xen/test/Makefile
@@ -0,0 +1,9 @@
+.PHONY: tests
+tests:
+ifeq ($(XEN_TARGET_ARCH),x86_64)
+       $(MAKE) -f $(BASEDIR)/Rules.mk -C livepatch livepatch
+endif
+
+.PHONY: clean
+clean::
+       $(MAKE) -f $(BASEDIR)/Rules.mk -C livepatch clean
diff --git a/xen/test/livepatch/Makefile b/xen/test/livepatch/Makefile
new file mode 100644
index 0000000..23dff1d
--- /dev/null
+++ b/xen/test/livepatch/Makefile
@@ -0,0 +1,85 @@
+include $(XEN_ROOT)/Config.mk
+
+CODE_ADDR=$(shell nm --defined $(1) | grep $(2) | awk '{print "0x"$$1}')
+CODE_SZ=$(shell nm --defined -S $(1) | grep $(2) | awk '{ print "0x"$$2}')
+
+.PHONY: default
+
+LIVEPATCH := xen_hello_world.livepatch
+LIVEPATCH_BYE := xen_bye_world.livepatch
+LIVEPATCH_REPLACE := xen_replace_world.livepatch
+
+default: livepatch
+
+install: livepatch
+       $(INSTALL_DATA) $(LIVEPATCH) $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH)
+       $(INSTALL_DATA) $(LIVEPATCH_BYE) $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_BYE)
+       $(INSTALL_DATA) $(LIVEPATCH_REPLACE) 
$(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_REPLACE)
+uninstall:
+       rm -f $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH)
+       rm -f $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_BYE)
+       rm -f $(DESTDIR)$(DEBUG_DIR)/$(LIVEPATCH_REPLACE)
+
+.PHONY: clean
+clean::
+       rm -f *.o .*.o.d *.livepatch config.h
+
+#
+# To compute these values we need the binary files: xen-syms
+# and xen_hello_world_func.o to be already compiled.
+#
+.PHONY: config.h
+config.h: OLD_CODE_SZ=$(call CODE_SZ,$(BASEDIR)/xen-syms,xen_extra_version)
+config.h: NEW_CODE_SZ=$(call CODE_SZ,$<,xen_hello_world)
+config.h: xen_hello_world_func.o
+       (set -e; \
+        echo "#define NEW_CODE_SZ $(NEW_CODE_SZ)"; \
+        echo "#define OLD_CODE_SZ $(OLD_CODE_SZ)") > $@
+
+xen_hello_world.o: config.h
+
+.PHONY: $(LIVEPATCH)
+$(LIVEPATCH): xen_hello_world_func.o xen_hello_world.o note.o
+       $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(LIVEPATCH) $^
+
+#
+# This target is only accessible if CONFIG_LIVEPATCH is defined, which
+# depends on $(build_id_linker) being available. Hence we do not
+# need any checks.
+#
+# N.B. The reason we don't use arch/x86/note.o is that it may
+# not be built (it is for EFI builds), and that we do not have
+# the note.o.bin to muck with (as it gets deleted)
+#
+.PHONY: note.o
+note.o:
+       $(OBJCOPY) -O binary --only-section=.note.gnu.build-id 
$(BASEDIR)/xen-syms $@.bin
+       $(OBJCOPY) -I binary -O elf64-x86-64 -B i386:x86-64 \
+                  --rename-section=.data=.livepatch.depends -S $@.bin $@
+       rm -f $@.bin
+
+#
+# Extract the build-id of the xen_hello_world.livepatch
+# (which xen_bye_world will depend on).
+#
+.PHONY: hello_world_note.o
+hello_world_note.o: $(LIVEPATCH)
+       $(OBJCOPY) -O binary --only-section=.note.gnu.build-id $(LIVEPATCH) 
$@.bin
+       $(OBJCOPY)  -I binary -O elf64-x86-64 -B i386:x86-64 \
+                  --rename-section=.data=.livepatch.depends -S $@.bin $@
+       rm -f $@.bin
+
+xen_bye_world.o: config.h
+
+.PHONY: $(LIVEPATCH_BYE)
+$(LIVEPATCH_BYE): xen_bye_world_func.o xen_bye_world.o hello_world_note.o
+       $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(LIVEPATCH_BYE) $^
+
+xen_replace_world.o: config.h
+
+.PHONY: $(LIVEPATCH_REPLACE)
+$(LIVEPATCH_REPLACE): xen_replace_world_func.o xen_replace_world.o note.o
+       $(LD) $(LDFLAGS) $(build_id_linker) -r -o $(LIVEPATCH_REPLACE) $^
+
+.PHONY: livepatch
+livepatch: $(LIVEPATCH) $(LIVEPATCH_BYE) $(LIVEPATCH_REPLACE)
diff --git a/xen/test/livepatch/xen_bye_world.c 
b/xen/test/livepatch/xen_bye_world.c
new file mode 100644
index 0000000..b75e0b1
--- /dev/null
+++ b/xen/test/livepatch/xen_bye_world.c
@@ -0,0 +1,34 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ *
+ */
+
+#include "config.h"
+#include <xen/lib.h>
+#include <xen/types.h>
+#include <xen/version.h>
+#include <xen/livepatch.h>
+
+#include <public/sysctl.h>
+
+static char bye_world_patch_this_fnc[] = "xen_extra_version";
+extern const char *xen_bye_world(void);
+
+struct livepatch_func __section(".livepatch.funcs") livepatch_xen_bye_world = {
+    .version = LIVEPATCH_PAYLOAD_VERSION,
+    .name = bye_world_patch_this_fnc,
+    .new_addr = xen_bye_world,
+    .old_addr = xen_extra_version,
+    .new_size = NEW_CODE_SZ,
+    .old_size = OLD_CODE_SZ,
+};
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/test/livepatch/xen_bye_world_func.c 
b/xen/test/livepatch/xen_bye_world_func.c
new file mode 100644
index 0000000..32ef341
--- /dev/null
+++ b/xen/test/livepatch/xen_bye_world_func.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ *
+ */
+
+#include <xen/types.h>
+
+/* Our replacement function for xen_hello_world. */
+const char *xen_bye_world(void)
+{
+    return "Bye World!";
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/test/livepatch/xen_hello_world.c 
b/xen/test/livepatch/xen_hello_world.c
new file mode 100644
index 0000000..472fe2e
--- /dev/null
+++ b/xen/test/livepatch/xen_hello_world.c
@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ *
+ */
+
+#include "config.h"
+#include <xen/lib.h>
+#include <xen/types.h>
+#include <xen/version.h>
+#include <xen/livepatch.h>
+#include <xen/livepatch_payload.h>
+
+#include <public/sysctl.h>
+
+static char hello_world_patch_this_fnc[] = "xen_extra_version";
+extern const char *xen_hello_world(void);
+/*
+ * .bss is only cleared once - during upload. Apply/revert/apply will result
+ * in cnt to have a non-zero value (see the hooks below).
+ */
+static unsigned int cnt;
+
+static void apply_hook(void)
+{
+    printk(KERN_DEBUG "Hook executing.\n");
+}
+
+static void revert_hook(void)
+{
+    printk(KERN_DEBUG "Hook unloaded.\n");
+}
+
+static void  hi_func(void)
+{
+    printk(KERN_DEBUG "%s: Hi! (called %u times)\n", __func__, ++cnt);
+};
+
+LIVEPATCH_LOAD_HOOK(apply_hook);
+LIVEPATCH_UNLOAD_HOOK(revert_hook);
+
+/* Imbalance here. Two load and three unload. */
+
+LIVEPATCH_LOAD_HOOK(hi_func);
+LIVEPATCH_UNLOAD_HOOK(hi_func);
+
+struct livepatch_func __section(".livepatch.funcs") livepatch_xen_hello_world 
= {
+    .version = LIVEPATCH_PAYLOAD_VERSION,
+    .name = hello_world_patch_this_fnc,
+    .new_addr = xen_hello_world,
+    .old_addr = xen_extra_version,
+    .new_size = NEW_CODE_SZ,
+    .old_size = OLD_CODE_SZ,
+};
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/test/livepatch/xen_hello_world_func.c 
b/xen/test/livepatch/xen_hello_world_func.c
new file mode 100644
index 0000000..03d6b84
--- /dev/null
+++ b/xen/test/livepatch/xen_hello_world_func.c
@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ *
+ */
+
+#include <xen/types.h>
+
+#include <asm/alternative.h>
+#include <asm/nops.h>
+#include <asm/uaccess.h>
+
+static unsigned long *non_canonical_addr = (unsigned long 
*)0xdead000000000000ULL;
+
+/* Our replacement function for xen_extra_version. */
+const char *xen_hello_world(void)
+{
+    unsigned long tmp;
+    int rc;
+
+    alternative(ASM_NOP8, ASM_NOP1, X86_FEATURE_LM);
+    /*
+     * Any BUG, or WARN_ON will contain symbol and payload name. Furthermore
+     * exceptions will be caught and processed properly.
+     */
+    rc = __get_user(tmp, non_canonical_addr);
+    BUG_ON(rc != -EFAULT);
+
+    return "Hello World";
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/test/livepatch/xen_replace_world.c 
b/xen/test/livepatch/xen_replace_world.c
new file mode 100644
index 0000000..a2a221a
--- /dev/null
+++ b/xen/test/livepatch/xen_replace_world.c
@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ *
+ */
+
+#include "config.h"
+#include <xen/lib.h>
+#include <xen/types.h>
+#include <xen/livepatch.h>
+
+#include <public/sysctl.h>
+
+static char xen_replace_world_name[] = "xen_extra_version";
+extern const char *xen_replace_world(void);
+
+struct livepatch_func __section(".livepatch.funcs") 
livepatch_xen_replace_world = {
+    .version = LIVEPATCH_PAYLOAD_VERSION,
+    .name = xen_replace_world_name,
+    .old_addr = 0, /* Forces the hypervisor to lookup .name */
+    .new_addr = xen_replace_world,
+    .new_size = NEW_CODE_SZ,
+    .old_size = OLD_CODE_SZ,
+};
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
diff --git a/xen/test/livepatch/xen_replace_world_func.c 
b/xen/test/livepatch/xen_replace_world_func.c
new file mode 100644
index 0000000..afb5cda
--- /dev/null
+++ b/xen/test/livepatch/xen_replace_world_func.c
@@ -0,0 +1,22 @@
+/*
+ * Copyright (c) 2016 Oracle and/or its affiliates. All rights reserved.
+ *
+ */
+
+#include <xen/types.h>
+
+/* Our replacement function for xen_hello_world. */
+const char *xen_replace_world(void)
+{
+    return "Hello Again World!";
+}
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * tab-width: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
-- 
2.4.11


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