[Xen-devel] [PATCH v3 4/7] create-diff-object: Add support for applied/reverted marker

[Pawel Wieczorkiewicz <wipawel@xxxxxxxxx>]

With version 2 of a payload structure additional field is supported
to track whether given function has been applied or reverted.
There also comes additional 8-byte alignment padding to reserve
place for future flags and options.

The new fields are zero-out upon .livepatch.funcs section creation.

Signed-off-by: Pawel Wieczorkiewicz <wipawel@xxxxxxxxx>
Reviewed-by: Ross Lagerwall <ross.lagerwall@xxxxxxxxxx>
---
 common.h             | 2 ++
 create-diff-object.c | 4 +++-
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/common.h b/common.h
index 300e508..9f9cb7b 100644
--- a/common.h
+++ b/common.h
@@ -124,6 +124,8 @@ struct livepatch_patch_func {
        uint32_t old_size;
        uint8_t version;
        unsigned char pad[31];
+       uint8_t applied;
+       uint8_t _pad[7];
 };
 
 struct special_section {
diff --git a/create-diff-object.c b/create-diff-object.c
index fed47cd..e886d4c 100644
--- a/create-diff-object.c
+++ b/create-diff-object.c
@@ -2013,8 +2013,10 @@ static void livepatch_create_patches_sections(struct 
kpatch_elf *kelf,
                        funcs[index].old_size = result.size;
                        funcs[index].new_addr = 0;
                        funcs[index].new_size = sym->sym.st_size;
-                       funcs[index].version = 1;
+                       funcs[index].version = 2;
                        memset(funcs[index].pad, 0, sizeof funcs[index].pad);
+                       funcs[index].applied = 0;
+                       memset(funcs[index]._pad, 0, sizeof funcs[index]._pad);
 
                        /*
                         * Add a relocation that will populate
-- 
2.16.5




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