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Sun, 26 Apr 2026 20:45:26 -0700 (PDT) From: WANG Rui To: Ard Biesheuvel , Huacai Chen Cc: Ilias Apalodimas , WANG Xuerui , linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, loongarch@lists.linux.dev, WANG Rui Subject: [PATCH 2/2] efi/libstub: Synchronize instruction cache after kernel relocation Date: Mon, 27 Apr 2026 11:44:51 +0800 Message-ID: <20260427034451.717817-3-r@hev.cc> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260427034451.717817-1-r@hev.cc> References: <20260427034451.717817-1-r@hev.cc> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The relocated kernel image is copied to its new location using memcpy(). On architectures with separate instruction and data caches, the copied instructions may remain stale in the instruction cache, leading to the execution of outdated contents. Call efi_cache_sync_image() after the relocation copy to ensure the instruction cache is synchronized with the updated memory contents before control is transferred to the relocated kernel. Signed-off-by: WANG Rui --- drivers/firmware/efi/libstub/relocate.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/firmware/efi/libstub/relocate.c b/drivers/firmware/efi/libstub/relocate.c index d4264bfb6dc1..913b425d089d 100644 --- a/drivers/firmware/efi/libstub/relocate.c +++ b/drivers/firmware/efi/libstub/relocate.c @@ -158,6 +158,7 @@ efi_status_t efi_relocate_kernel(unsigned long *image_addr, * have been allocated by UEFI, so we can safely use memcpy. */ memcpy((void *)new_addr, (void *)cur_image_addr, image_size); + efi_cache_sync_image(new_addr, image_size); /* Return the new address of the relocated image. */ *image_addr = new_addr; -- 2.54.0