From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mga09.intel.com (mga09.intel.com [134.134.136.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AF4D815C90 for ; Mon, 7 Nov 2022 22:54:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1667861690; x=1699397690; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=Mk+Vz7rzmu4MdLLvCybyRG1sgfbqtsuXJMMpfrS3JGA=; b=TevDA/lCyShBlwtpFzjHrSQ12PHP4rIPg4E3FHu7KpUfRJV2vA1o5hpk vldHg1KvCapl4jWh3EPUzDexL/kr/Pc+gE2mnC3CQ+fUQamioWqVZ9gGD 98Mi1+jlKSbSL4rmWgT3VV+2xvNeuMiHrPIgg7bzZZIrpwlfdRSXsZX+/ qkBUQ3DcEh3SpXPS471HQ63Td90/4hc83RFcJqSkD5uH9AYW1/lH2S4/D jpggX31w9WvZspiV0+82SjnNdnIT1ma7h710rnneDr+cmWjhtkcC3DmA7 V6yrUqm8d8Dj0kJlVfb5n7cHfuLiy+5jpMZ0MtRbXRBAD09BRy4DAmKb6 Q==; X-IronPort-AV: E=McAfee;i="6500,9779,10524"; a="311697414" X-IronPort-AV: E=Sophos;i="5.96,145,1665471600"; d="scan'208";a="311697414" Received: from orsmga005.jf.intel.com ([10.7.209.41]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2022 14:54:47 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10524"; a="811012982" X-IronPort-AV: E=Sophos;i="5.96,145,1665471600"; d="scan'208";a="811012982" Received: from jithujos.sc.intel.com ([172.25.103.66]) by orsmga005-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 07 Nov 2022 14:54:47 -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 v2 08/14] platform/x86/intel/ifs: Add metadata support Date: Mon, 7 Nov 2022 14:53:17 -0800 Message-Id: <20221107225323.2733518-9-jithu.joseph@intel.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20221107225323.2733518-1-jithu.joseph@intel.com> References: <20221021203413.1220137-1-jithu.joseph@intel.com> <20221107225323.2733518-1-jithu.joseph@intel.com> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Ashok Raj One of the existing reserved fields in microcode header has been allocated to indicate the size for metadata structures. The 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. In subsequent patches, IFS test image file (which reuse microcode header format) will make use of metadata section. Reviewed-by: Tony Luck 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 89ce265887ea..60ba5a057f91 100644 --- a/drivers/platform/x86/intel/ifs/load.c +++ b/drivers/platform/x86/intel/ifs/load.c @@ -44,6 +44,38 @@ static const char * const scan_authentication_status[] = { [2] = "Chunk authentication error. The hash of chunk did not match expected value" }; +#define META_TYPE_END (0) + +struct metadata_header { + unsigned int type; + unsigned int blk_size; +}; + +static struct metadata_header *ifs_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 != 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. -- 2.25.1