[PATCH v2 01/10] efi/zboot: arm64: Add missing barrier after cache maintenance

[Ard Biesheuvel]

From: Ard Biesheuvel <ardb at kernel.org>

Prevent the I-cache from fetching stale data by issuing a barrier after
the data cache maintenance completes but before performing the I-cache
maintenance.

Cc: <stable at vger.kernel.org>
Signed-off-by: Ard Biesheuvel <ardb at kernel.org>
---
 drivers/firmware/efi/libstub/arm64.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/firmware/efi/libstub/arm64.c b/drivers/firmware/efi/libstub/arm64.c
index e57cd3de0a00..62fc8e53c8a0 100644
--- a/drivers/firmware/efi/libstub/arm64.c
+++ b/drivers/firmware/efi/libstub/arm64.c
@@ -107,6 +107,8 @@ void efi_cache_sync_image(unsigned long image_base,
 			base += lsize;
 			size -= lsize;
 		} while (size >= lsize);
+
+		dsb(ish);
 	}
 
 	asm("ic ialluis");
-- 
2.56.0.542.g3ef89b7020-goog