From patchwork Mon Apr 10 22:59:29 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Chang S. Bae" X-Patchwork-Id: 672092 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 B46D9C77B70 for ; Mon, 10 Apr 2023 23:11:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229879AbjDJXLw (ORCPT ); Mon, 10 Apr 2023 19:11:52 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229761AbjDJXLm (ORCPT ); Mon, 10 Apr 2023 19:11:42 -0400 Received: from mga11.intel.com (mga11.intel.com [192.55.52.93]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E65B82118; Mon, 10 Apr 2023 16:11:41 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1681168301; x=1712704301; h=from:to:cc:subject:date:message-id:in-reply-to: references; bh=ICOUeWJ4MvP0vL80dft48PfCDjzRn/jTo0cQSkMOY5o=; b=BJVqyUW6fr1++i17en4FHgZjoOT7E6mRvVuu4LVkLkX94Ve67nWn5fFk ho/OoxJQJliW/t1PSfYw1OKyJ2AnPn9LtQurXhS3yFSXvRDII6WTAzyLy PQUWnveojym3rAZcUavXzLJ/wEB/QZBIZZW7wWCgkVoKx1UcuHb6+2hhr 2u6LMp9RGNOVD/MM5uJ+tvCAL8kET4w9lLJC5z8L/1etyuR6nSM7/uDB9 0EZrcmIgYpsPPBO6ZtEqZMDADx1rGJU/faaKmsN0yHElBxXmZwC5fTagb Mql1WALFP/rlrLXuRfAeX83c8bBc/SnlFJz5a7FsIYKuFH4P9Wfn40E1k A==; X-IronPort-AV: E=McAfee;i="6600,9927,10676"; a="340962538" X-IronPort-AV: E=Sophos;i="5.98,335,1673942400"; d="scan'208";a="340962538" Received: from fmsmga004.fm.intel.com ([10.253.24.48]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 10 Apr 2023 16:11:40 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10676"; a="757608002" X-IronPort-AV: E=Sophos;i="5.98,335,1673942400"; d="scan'208";a="757608002" Received: from chang-linux-3.sc.intel.com ([172.25.66.173]) by fmsmga004.fm.intel.com with ESMTP; 10 Apr 2023 16:11:40 -0700 From: "Chang S. Bae" To: linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, dm-devel@redhat.com Cc: ebiggers@kernel.org, gmazyland@gmail.com, luto@kernel.org, dave.hansen@linux.intel.com, tglx@linutronix.de, bp@suse.de, mingo@kernel.org, x86@kernel.org, herbert@gondor.apana.org.au, ardb@kernel.org, dan.j.williams@intel.com, bernie.keany@intel.com, charishma1.gairuboyina@intel.com, lalithambika.krishnakumar@intel.com, chang.seok.bae@intel.com, Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Peter Zijlstra Subject: [PATCH v6 05/12] x86/msr-index: Add MSRs for Key Locker internal wrapping key Date: Mon, 10 Apr 2023 15:59:29 -0700 Message-Id: <20230410225936.8940-6-chang.seok.bae@intel.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20230410225936.8940-1-chang.seok.bae@intel.com> References: <20220112211258.21115-1-chang.seok.bae@intel.com> <20230410225936.8940-1-chang.seok.bae@intel.com> Precedence: bulk List-ID: X-Mailing-List: linux-crypto@vger.kernel.org The CPU state that contains the internal wrapping key is in the same power domain as the cache. So any sleep state that would invalidate the cache (like S3) also invalidates the state of the wrapping key. But, since the state is inaccessible to software, it needs a special mechanism to save and restore the key during deep sleep. A set of new MSRs are provided as an abstract interface to save and restore the wrapping key, and to check the key status. The wrapping key is saved in a platform-scoped state of non-volatile media. The backup itself and its path from the CPU are encrypted and integrity protected. But this storage's non-volatility is not architecturally guaranteed across off states, such as S5 and G3. The MSRs will be used to back up the key for S3/4 sleep states. Then the kernel code writes one of them to restore the key in each CPU state. Signed-off-by: Chang S. Bae Reviewed-by: Dan Williams Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: Peter Zijlstra Cc: x86@kernel.org Cc: linux-kernel@vger.kernel.org --- Changes from RFC v2: * Update the changelog. (Dan Williams) * Rename the MSRs. (Dan Williams) --- arch/x86/include/asm/msr-index.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index ad35355ee43e..4fa3b9e26162 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -1115,4 +1115,10 @@ * a #GP */ +/* MSRs for managing an internal wrapping key for Key Locker. */ +#define MSR_IA32_IWKEY_COPY_STATUS 0x00000990 +#define MSR_IA32_IWKEY_BACKUP_STATUS 0x00000991 +#define MSR_IA32_BACKUP_IWKEY_TO_PLATFORM 0x00000d91 +#define MSR_IA32_COPY_IWKEY_TO_LOCAL 0x00000d92 + #endif /* _ASM_X86_MSR_INDEX_H */