From patchwork Mon Jul 4 13:58:25 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Martin Fernandez X-Patchwork-Id: 587606 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 78CE9C433EF for ; Mon, 4 Jul 2022 13:59:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234486AbiGDN7B (ORCPT ); Mon, 4 Jul 2022 09:59:01 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37024 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234409AbiGDN6y (ORCPT ); Mon, 4 Jul 2022 09:58:54 -0400 Received: from mail-vs1-xe32.google.com (mail-vs1-xe32.google.com [IPv6:2607:f8b0:4864:20::e32]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C25517640 for ; Mon, 4 Jul 2022 06:58:52 -0700 (PDT) Received: by mail-vs1-xe32.google.com with SMTP id 126so9051676vsq.13 for ; Mon, 04 Jul 2022 06:58:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=eclypsium.com; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=erdqpZYLja6xDuoUNWXMJOEwQp9qkWbhvYqoJ4co3Os=; b=V55waJR1QuKM8kC/rFEuxJwFmNLdmPKax7+zW9/siL7Mj36HUtopitwFYdMlAFbeEs rJWfeTLZaAEsZjfihwA9mJ7xH9DS6H9oWLlqTnMtLoS/+23JMDhQ3IeR7ap5oaFtTKxK Y+I83AZEsaJ4Ay6DnahMYHrQ3Gb04a7ON/+7oqwxrHjP8z+A6KzcYQNYXByQHkOWPqg2 FMPJkOHXrsJy7Eom5pARQ4bPJtkhaMhDPV5VhmeydbYuyBO61FHK10EdQ0vYkxE/OsLv t0rVB5AnOjfnQIbOlZIGo+FUsNZbVLhmEYJK9HYBt89yoXq1Mt6q8egiAwbnhj3Hep95 8kTw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=erdqpZYLja6xDuoUNWXMJOEwQp9qkWbhvYqoJ4co3Os=; b=hpAhG+48ygSBMQRhvL45nzpA7rKLueobRejvmJNhuqE99klRB2YHG7Ra7unGssTQTY O0z0cJqIZoqGStn9ZuObknxKgPrvpkkPiDj1UfFy62wWaDuPBAn4UzY9oMEp8wvfWwYZ a7Tn5s2JeE+JKy9u97OMgmxqr75o6cSzbwqkTdcfn21Gg8RsNBdfd0s5OgNV7WtNcugk K/JKwpmEE5/p85eeM+7k5ZlPyL8Dq6xF5XKsOyUUH14wPenG3fwTVkgp7S/06IdzGd4C uTcIlEfc0NsUt8KAhvP+nPcVf0oEzYzy/UAfHH3M1HLKXtmcLhfJCl9ipd5F6IMw2Zf2 yeNg== X-Gm-Message-State: AJIora8qPvN+IB9Drp6Iig143x6tYDy+2vJe9YiJqnGP07f2cktuXM2D hOD0NK9cYCM/2FBARAKXxjLgag== X-Google-Smtp-Source: AGRyM1uu2u3rbg5Giv2gmMbrQfmLY/m5Z5qJo0bY5VChxGRJJIApXm7e/0jrs7sHJbYJu65GFpqcqw== X-Received: by 2002:a67:43c4:0:b0:354:49cf:f663 with SMTP id q187-20020a6743c4000000b0035449cff663mr16345113vsa.38.1656943132140; Mon, 04 Jul 2022 06:58:52 -0700 (PDT) Received: from localhost ([181.97.174.128]) by smtp.gmail.com with ESMTPSA id v16-20020a056102303000b0035609fbb1a9sm3567826vsa.1.2022.07.04.06.58.47 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 04 Jul 2022 06:58:51 -0700 (PDT) From: Martin Fernandez To: linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org, platform-driver-x86@vger.kernel.org, linux-mm@kvack.org, kunit-dev@googlegroups.com, linux-kselftest@vger.kernel.org Cc: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, ardb@kernel.org, dvhart@infradead.org, andy@infradead.org, gregkh@linuxfoundation.org, rafael@kernel.org, rppt@kernel.org, akpm@linux-foundation.org, daniel.gutson@eclypsium.com, hughsient@gmail.com, alex.bazhaniuk@eclypsium.com, alison.schofield@intel.com, keescook@chromium.org, Martin Fernandez Subject: [PATCH v9 1/9] mm/memblock: Tag memblocks with crypto capabilities Date: Mon, 4 Jul 2022 10:58:25 -0300 Message-Id: <20220704135833.1496303-2-martin.fernandez@eclypsium.com> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220704135833.1496303-1-martin.fernandez@eclypsium.com> References: <20220704135833.1496303-1-martin.fernandez@eclypsium.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Add the capability to mark regions of the memory memory_type able of hardware memory encryption. Also add the capability to query if all regions of a memory node are able to do hardware memory encryption to call it when initializing the nodes. Warn the user if a node has both encryptable and non-encryptable regions. Signed-off-by: Martin Fernandez --- include/linux/memblock.h | 5 ++++ mm/memblock.c | 62 ++++++++++++++++++++++++++++++++++++++++ 2 files changed, 67 insertions(+) diff --git a/include/linux/memblock.h b/include/linux/memblock.h index 50ad19662a32..00c4f1a20335 100644 --- a/include/linux/memblock.h +++ b/include/linux/memblock.h @@ -40,6 +40,7 @@ extern unsigned long long max_possible_pfn; * via a driver, and never indicated in the firmware-provided memory map as * system RAM. This corresponds to IORESOURCE_SYSRAM_DRIVER_MANAGED in the * kernel resource tree. + * @MEMBLOCK_CRYPTO_CAPABLE: capable of hardware encryption */ enum memblock_flags { MEMBLOCK_NONE = 0x0, /* No special request */ @@ -47,6 +48,7 @@ enum memblock_flags { MEMBLOCK_MIRROR = 0x2, /* mirrored region */ MEMBLOCK_NOMAP = 0x4, /* don't add to kernel direct mapping */ MEMBLOCK_DRIVER_MANAGED = 0x8, /* always detected via a driver */ + MEMBLOCK_CRYPTO_CAPABLE = 0x10, /* capable of hardware encryption */ }; /** @@ -120,6 +122,9 @@ int memblock_physmem_add(phys_addr_t base, phys_addr_t size); void memblock_trim_memory(phys_addr_t align); bool memblock_overlaps_region(struct memblock_type *type, phys_addr_t base, phys_addr_t size); +bool memblock_node_is_crypto_capable(int nid); +int memblock_mark_crypto_capable(phys_addr_t base, phys_addr_t size); +int memblock_clear_crypto_capable(phys_addr_t base, phys_addr_t size); int memblock_mark_hotplug(phys_addr_t base, phys_addr_t size); int memblock_clear_hotplug(phys_addr_t base, phys_addr_t size); int memblock_mark_mirror(phys_addr_t base, phys_addr_t size); diff --git a/mm/memblock.c b/mm/memblock.c index e4f03a6e8e56..d6399835b155 100644 --- a/mm/memblock.c +++ b/mm/memblock.c @@ -191,6 +191,40 @@ bool __init_memblock memblock_overlaps_region(struct memblock_type *type, return i < type->cnt; } +/** + * memblock_node_is_crypto_capable - get if whole node is capable + * of encryption + * @nid: number of node + * + * Iterate over all memory memblock_type and find if all regions under + * node @nid are capable of hardware encryption. + * + * Return: + * true if every region in @nid is capable of encryption, false + * otherwise. + */ +bool __init_memblock memblock_node_is_crypto_capable(int nid) +{ + struct memblock_region *region; + int crypto_capables = 0; + int not_crypto_capables = 0; + + for_each_mem_region(region) { + if (memblock_get_region_node(region) == nid) { + if (region->flags & MEMBLOCK_CRYPTO_CAPABLE) + crypto_capables++; + else + not_crypto_capables++; + } + } + + if (crypto_capables > 0 && not_crypto_capables > 0) + pr_warn("Node %d has %d regions that are encryptable and %d regions that aren't", + nid, not_crypto_capables, crypto_capables); + + return crypto_capables > 0 && not_crypto_capables == 0; +} + /** * __memblock_find_range_bottom_up - find free area utility in bottom-up * @start: start of candidate range @@ -891,6 +925,34 @@ static int __init_memblock memblock_setclr_flag(phys_addr_t base, return 0; } +/** + * memblock_mark_crypto_capable - Mark memory regions capable of hardware + * encryption with flag MEMBLOCK_CRYPTO_CAPABLE. + * @base: the base phys addr of the region + * @size: the size of the region + * + * Return: 0 on success, -errno on failure. + */ +int __init_memblock memblock_mark_crypto_capable(phys_addr_t base, + phys_addr_t size) +{ + return memblock_setclr_flag(base, size, 1, MEMBLOCK_CRYPTO_CAPABLE); +} + +/** + * memblock_clear_crypto_capable - Clear flag MEMBLOCK_CRYPTO for a + * specified region. + * @base: the base phys addr of the region + * @size: the size of the region + * + * Return: 0 on success, -errno on failure. + */ +int __init_memblock memblock_clear_crypto_capable(phys_addr_t base, + phys_addr_t size) +{ + return memblock_setclr_flag(base, size, 0, MEMBLOCK_CRYPTO_CAPABLE); +} + /** * memblock_mark_hotplug - Mark hotpluggable memory with flag MEMBLOCK_HOTPLUG. * @base: the base phys addr of the region