[PATCH] lib/efi_loader: fix ABI in efi_mm_communicate_header

[Etienne Carriere]

Pack struct efi_mm_communicate_header as done in EDK2 as seen in
release 201808 [1]. If not packed sizeof() for the structure adds
4 additional bytes on 32bit targets which breaks the ABI.

Link: [1] https://github.com/tianocore/edk2/blob/edk2-stable201808/MdePkg/Include/Protocol/MmCommunication.h#L21
Fixes: 23a397d2e2fb ("efi_loader: Add headers for EDK2 StandAloneMM communication")
Signed-off-by: Etienne Carriere <etienne.carriere at linaro.org>
---
 include/mm_communication.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/mm_communication.h b/include/mm_communication.h
index e464cbb48e..e65fbde60d 100644
--- a/include/mm_communication.h
+++ b/include/mm_communication.h
@@ -43,7 +43,7 @@
  * To avoid confusion in interpreting frames, the communication buffer should
  * always begin with efi_mm_communicate_header.
  */
-struct efi_mm_communicate_header {
+struct __packed efi_mm_communicate_header {
 	efi_guid_t header_guid;
 	size_t     message_len;
 	u8         data[];
-- 
2.17.1