* [PATCH v2 01/10] efi/zboot: arm64: Add missing barrier after cache maintenance
[not found] <20261110121731.2728824-12-ardb+git@google.com>
@ 2026-11-10 12:17 ` Ard Biesheuvel
0 siblings, 0 replies; only message in thread
From: Ard Biesheuvel @ 2026-11-10 12:17 UTC (permalink / raw)
To: linux-efi
Cc: linux-arm-kernel, Ard Biesheuvel, Jason Gunthorpe, Paul Walmsley,
Palmer Dabbelt, Albert Ou, Huacai Chen, loongarch, linux-riscv,
stable
From: Ard Biesheuvel <ardb@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@vger.kernel.org>
Signed-off-by: Ard Biesheuvel <ardb@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
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