From patchwork Fri Mar 4 09:35:17 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jarkko Sakkinen X-Patchwork-Id: 12768828 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D166DC4167E for ; Fri, 4 Mar 2022 09:37:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239077AbiCDJif (ORCPT ); Fri, 4 Mar 2022 04:38:35 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55174 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S239470AbiCDJiM (ORCPT ); Fri, 4 Mar 2022 04:38:12 -0500 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5663C75603; Fri, 4 Mar 2022 01:37:19 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id B42A3618EF; Fri, 4 Mar 2022 09:37:18 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 98BD7C340E9; Fri, 4 Mar 2022 09:37:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1646386638; bh=bHeESoq0k2mSEDu9DZQY+QQFO8wHekg/jk6QS3O0pUE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=MEZ9NTT0OI4NPRUAkGocKZ6x94r0wWgcfZB9FQh0TvORgBYTRCnPx9ItN/NHWvM2d BUaMsHjV83KQvtldKmOnTZw/mq8H39XbmFHVMnvSzLyqU+rEFTwatNCVqBC6gzCc8n YTc6xTkBkHIYwKJT9ZHuiv8K8uShhMR2uemUbWwWuc6nGHd7clt0At2zEtwV1yOsW8 F9KN4ajgNdG/o02bvOKldetVMDVHbvMQqFYQDqkxKTcbKlSF9gBFaKE8xPoFgK4g37 9E24Vg2AUYBFhigxLz+HykcSArkB7Nq0wzPe9DUYLauq5iysOMpsInBRKQTHcQJ3Ac Yj0kwWqKYebfQ== From: Jarkko Sakkinen To: linux-sgx@vger.kernel.org Cc: Nathaniel McCallum , Reinette Chatre , Jarkko Sakkinen , Dave Hansen , Shuah Khan , linux-kselftest@vger.kernel.org (open list:KERNEL SELFTEST FRAMEWORK), linux-kernel@vger.kernel.org (open list) Subject: [RFC PATCH v2.1 23/30] selftests/sgx: Introduce dynamic entry point Date: Fri, 4 Mar 2022 11:35:17 +0200 Message-Id: <20220304093524.397485-23-jarkko@kernel.org> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220304093524.397485-1-jarkko@kernel.org> References: <20220304093524.397485-1-jarkko@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-sgx@vger.kernel.org From: Reinette Chatre The test enclave (test_encl.elf) is built with two initialized Thread Control Structures (TCS) included in the binary. Both TCS are initialized with the same entry point, encl_entry, that correctly computes the absolute address of the stack based on the stack of each TCS that is also built into the binary. A new TCS can be added dynamically to the enclave and requires to be initialized with an entry point used to enter the enclave. Since the existing entry point, encl_entry, assumes that the TCS and its stack exists at particular offsets within the binary it is not able to handle a dynamically added TCS and its stack. Introduce a new entry point, encl_dyn_entry, that initializes the absolute address of that thread's stack to the address immediately preceding the TCS itself. It is now possible to dynamically add a contiguous memory region to the enclave with the new stack preceding the new TCS. With the new TCS initialized with encl_dyn_entry as entry point the absolute address of the stack is computed correctly on entry. Signed-off-by: Reinette Chatre --- tools/testing/selftests/sgx/test_encl_bootstrap.S | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/tools/testing/selftests/sgx/test_encl_bootstrap.S b/tools/testing/selftests/sgx/test_encl_bootstrap.S index 82fb0dfcbd23..03ae0f57e29d 100644 --- a/tools/testing/selftests/sgx/test_encl_bootstrap.S +++ b/tools/testing/selftests/sgx/test_encl_bootstrap.S @@ -45,6 +45,12 @@ encl_entry: # TCS #2. By adding the value of encl_stack to it, we get # the absolute address for the stack. lea (encl_stack)(%rbx), %rax + jmp encl_entry_core +encl_dyn_entry: + # Entry point for dynamically created TCS page expected to follow + # its stack directly. + lea -1(%rbx), %rax +encl_entry_core: xchg %rsp, %rax push %rax