From patchwork Thu Nov 17 03:59:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Joseph, Jithu" X-Patchwork-Id: 13046092 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 A1D99C43219 for ; Thu, 17 Nov 2022 04:01:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232521AbiKQEBQ (ORCPT ); Wed, 16 Nov 2022 23:01:16 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34348 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234651AbiKQEBA (ORCPT ); Wed, 16 Nov 2022 23:01:00 -0500 Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6614149B5D; Wed, 16 Nov 2022 20:00:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1668657659; x=1700193659; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=VUNG8NIAa9pCK7zUL68UQaJAiq+0V2MYRuzo+MnCPyY=; b=LYct/lRo7EvxahFnHnklzKa1D39bQEDy7xdb7KnUO5SQ/6vSv6c36oez PuM2cUN6H9OKePC2c05XyxTMYO6woeZltwO5OR81rgeyE9sqw65+2MX2M 9RtC/80Lyx/uoXgugRimRvFzHMWhL4E06jhVusf4sE4sf//xdE57PjLl8 q+3dvtlns9uw60MW8MEen5or9sciMj5WQE8o61nK0MpSU0QTNBzruraA/ BTv6Cly4XJdE6lrhGQgqKiA1a5U5e8oUPdyDPJmWSX/Rz+Vbbn+8m7ilD JZEc/Mq4GCpw8Shb7aOHDq2WIv0z1ZnLVSKHzTC1JdgMwp51TKdAX1s0b g==; X-IronPort-AV: E=McAfee;i="6500,9779,10533"; a="292455972" X-IronPort-AV: E=Sophos;i="5.96,169,1665471600"; d="scan'208";a="292455972" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga106.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Nov 2022 20:00:59 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10533"; a="590462701" X-IronPort-AV: E=Sophos;i="5.96,169,1665471600"; d="scan'208";a="590462701" Received: from jithujos.sc.intel.com ([172.25.103.66]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 16 Nov 2022 20:00:58 -0800 From: Jithu Joseph To: hdegoede@redhat.com, markgross@kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, gregkh@linuxfoundation.org, jithu.joseph@intel.com, ashok.raj@intel.com, tony.luck@intel.com, linux-kernel@vger.kernel.org, platform-driver-x86@vger.kernel.org, patches@lists.linux.dev, ravi.v.shankar@intel.com, thiago.macieira@intel.com, athenas.jimenez.gonzalez@intel.com, sohil.mehta@intel.com Subject: [PATCH v3 10/16] platform/x86/intel/ifs: Add metadata support Date: Wed, 16 Nov 2022 19:59:29 -0800 Message-Id: <20221117035935.4136738-11-jithu.joseph@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221117035935.4136738-1-jithu.joseph@intel.com> References: <20221107225323.2733518-1-jithu.joseph@intel.com> <20221117035935.4136738-1-jithu.joseph@intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: platform-driver-x86@vger.kernel.org From: Ashok Raj One of the existing reserved fields in microcode header has been allocated to indicate the size for metadata structures. The location of metadata section within microcode header is as shown below: Microcode Format +----------------------+ Base |Header Version | +----------------------+ |Update revision | +----------------------+ |Date DDMMYYYY | +----------------------+ |Sig | +----------------------+ |Checksum | +----------------------+ |Loader Version | +----------------------+ |Processor Flags | +----------------------+ |Data Size | +----------------------+ |Total Size | +----------------------+ |Meta Size | +----------------------+ |Reserved | +----------------------+ |Reserved | +----------------------+ Base+48 | | | | | | | | | Microcode | | | | Data | | | | | +----------------------+ Base+48+data_size- | | meta_size | Meta Data | | structure(s) | | | +----------------------+ Base+48+data_size | Extended Signature | | Table | | | | | | | | | | | +----------------------+ Base+total_size Add an accessor function which will return a pointer to the start of a specific meta_type being queried. Upcoming changes will introduce the layout of IFS metadata structure and will make use of metadata section. Reviewed-by: Tony Luck Reviewed-by: Sohil Mehta Reviewed-by: Hans de Goede Signed-off-by: Ashok Raj Signed-off-by: Jithu Joseph --- drivers/platform/x86/intel/ifs/load.c | 32 +++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) diff --git a/drivers/platform/x86/intel/ifs/load.c b/drivers/platform/x86/intel/ifs/load.c index c914e4d359db..713f18ce00a1 100644 --- a/drivers/platform/x86/intel/ifs/load.c +++ b/drivers/platform/x86/intel/ifs/load.c @@ -43,6 +43,38 @@ static const char * const scan_authentication_status[] = { [2] = "Chunk authentication error. The hash of chunk did not match expected value" }; +#define MC_HEADER_META_TYPE_END (0) + +struct metadata_header { + unsigned int type; + unsigned int blk_size; +}; + +static struct metadata_header *find_meta_data(void *ucode, unsigned int meta_type) +{ + struct metadata_header *meta_header; + unsigned long data_size, total_meta; + unsigned long meta_size = 0; + + data_size = get_datasize(ucode); + total_meta = ((struct microcode_intel *)ucode)->hdr.metasize; + if (!total_meta) + return NULL; + + meta_header = (ucode + MC_HEADER_SIZE + data_size) - total_meta; + + while (meta_header->type != MC_HEADER_META_TYPE_END && + meta_header->blk_size && + meta_size < total_meta) { + meta_size += meta_header->blk_size; + if (meta_header->type == meta_type) + return meta_header; + + meta_header = (void *)meta_header + meta_header->blk_size; + } + return NULL; +} + /* * To copy scan hashes and authenticate test chunks, the initiating cpu must point * to the EDX:EAX to the test image in linear address.