From patchwork Wed Dec 7 01:49:28 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Kirill A. Shutemov" X-Patchwork-Id: 632715 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 EFB19C4708D for ; Wed, 7 Dec 2022 01:51:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230082AbiLGBvF (ORCPT ); Tue, 6 Dec 2022 20:51:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60860 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230009AbiLGBuj (ORCPT ); Tue, 6 Dec 2022 20:50:39 -0500 Received: from mga04.intel.com (mga04.intel.com [192.55.52.120]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 010DB537DC; Tue, 6 Dec 2022 17:50:04 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1670377805; x=1701913805; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=DsLSYB0ldaIutEa0HLWA8q6UCSqPp2KzK7qJuCNXS/4=; b=nC0xE1HvoJtQLyCgd49iSjmGQmoCS3RC7x4pFVRLE2zx1eCVFDdQXbfE oZMxd5uyFUKyCdj5bjomAbL51i9Ckh08AMu0sIz79QLoqrprXX9TG63KW +Ba/qGT23keHGxDJNp6YW6nYzwgd7ELw3gDutObVttCFMFYfqNnm1nl4K Ss9/VNJHJ+kCCsgRU5XD24297nhUAPXVcF5Gx5iSMkf2IYq+7XGkj3CDW FGqO/I+eOHFK4C/rj0ijZiHxc8w/8y2g5fLysWwjXAvlnbWGBW0OTPwIo LcxLMHoyjMCZaP2PPcSgGc2LhyK1QFDdWjMN8jVk9VYcIn1uusvXALV9v w==; X-IronPort-AV: E=McAfee;i="6500,9779,10553"; a="315494594" X-IronPort-AV: E=Sophos;i="5.96,223,1665471600"; d="scan'208";a="315494594" Received: from orsmga002.jf.intel.com ([10.7.209.21]) by fmsmga104.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Dec 2022 17:50:02 -0800 X-IronPort-AV: E=McAfee;i="6500,9779,10553"; a="646427717" X-IronPort-AV: E=Sophos;i="5.96,223,1665471600"; d="scan'208";a="646427717" Received: from puneets1-mobl.ger.corp.intel.com (HELO box.shutemov.name) ([10.252.38.123]) by orsmga002-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Dec 2022 17:49:53 -0800 Received: by box.shutemov.name (Postfix, from userid 1000) id 8CDBF109C8D; Wed, 7 Dec 2022 04:49:39 +0300 (+03) From: "Kirill A. Shutemov" To: Borislav Petkov , Andy Lutomirski , Sean Christopherson , Andrew Morton , Joerg Roedel , Ard Biesheuvel Cc: Andi Kleen , Kuppuswamy Sathyanarayanan , David Rientjes , Vlastimil Babka , Tom Lendacky , Thomas Gleixner , Peter Zijlstra , Paolo Bonzini , Ingo Molnar , Dario Faggioli , Dave Hansen , Mike Rapoport , David Hildenbrand , Mel Gorman , marcelo.cerri@canonical.com, tim.gardner@canonical.com, khalid.elmously@canonical.com, philip.cox@canonical.com, aarcange@redhat.com, peterx@redhat.com, x86@kernel.org, linux-mm@kvack.org, linux-coco@lists.linux.dev, linux-efi@vger.kernel.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv8 09/14] x86/mm: Provide helpers for unaccepted memory Date: Wed, 7 Dec 2022 04:49:28 +0300 Message-Id: <20221207014933.8435-10-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.38.0 In-Reply-To: <20221207014933.8435-1-kirill.shutemov@linux.intel.com> References: <20221207014933.8435-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Core-mm requires few helpers to support unaccepted memory: - accept_memory() checks the range of addresses against the bitmap and accept memory if needed. - range_contains_unaccepted_memory() checks if anything within the range requires acceptance. Signed-off-by: Kirill A. Shutemov --- arch/x86/include/asm/page.h | 3 ++ arch/x86/include/asm/unaccepted_memory.h | 4 ++ arch/x86/mm/Makefile | 2 + arch/x86/mm/unaccepted_memory.c | 61 ++++++++++++++++++++++++ 4 files changed, 70 insertions(+) create mode 100644 arch/x86/mm/unaccepted_memory.c diff --git a/arch/x86/include/asm/page.h b/arch/x86/include/asm/page.h index 9cc82f305f4b..df4ec3a988dc 100644 --- a/arch/x86/include/asm/page.h +++ b/arch/x86/include/asm/page.h @@ -19,6 +19,9 @@ struct page; #include + +#include + extern struct range pfn_mapped[]; extern int nr_pfn_mapped; diff --git a/arch/x86/include/asm/unaccepted_memory.h b/arch/x86/include/asm/unaccepted_memory.h index 41fbfc798100..89fc91c61560 100644 --- a/arch/x86/include/asm/unaccepted_memory.h +++ b/arch/x86/include/asm/unaccepted_memory.h @@ -7,6 +7,10 @@ struct boot_params; void process_unaccepted_memory(struct boot_params *params, u64 start, u64 num); +#ifdef CONFIG_UNACCEPTED_MEMORY + void accept_memory(phys_addr_t start, phys_addr_t end); +bool range_contains_unaccepted_memory(phys_addr_t start, phys_addr_t end); #endif +#endif diff --git a/arch/x86/mm/Makefile b/arch/x86/mm/Makefile index c80febc44cd2..b0ef1755e5c8 100644 --- a/arch/x86/mm/Makefile +++ b/arch/x86/mm/Makefile @@ -67,3 +67,5 @@ obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_amd.o obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_identity.o obj-$(CONFIG_AMD_MEM_ENCRYPT) += mem_encrypt_boot.o + +obj-$(CONFIG_UNACCEPTED_MEMORY) += unaccepted_memory.o diff --git a/arch/x86/mm/unaccepted_memory.c b/arch/x86/mm/unaccepted_memory.c new file mode 100644 index 000000000000..1df918b21469 --- /dev/null +++ b/arch/x86/mm/unaccepted_memory.c @@ -0,0 +1,61 @@ +// SPDX-License-Identifier: GPL-2.0-only +#include +#include +#include +#include + +#include +#include +#include + +/* Protects unaccepted memory bitmap */ +static DEFINE_SPINLOCK(unaccepted_memory_lock); + +void accept_memory(phys_addr_t start, phys_addr_t end) +{ + unsigned long range_start, range_end; + unsigned long *bitmap; + unsigned long flags; + + if (!boot_params.unaccepted_memory) + return; + + bitmap = __va(boot_params.unaccepted_memory); + range_start = start / PMD_SIZE; + + spin_lock_irqsave(&unaccepted_memory_lock, flags); + for_each_set_bitrange_from(range_start, range_end, bitmap, + DIV_ROUND_UP(end, PMD_SIZE)) { + unsigned long len = range_end - range_start; + + /* Platform-specific memory-acceptance call goes here */ + panic("Cannot accept memory: unknown platform\n"); + bitmap_clear(bitmap, range_start, len); + } + spin_unlock_irqrestore(&unaccepted_memory_lock, flags); +} + +bool range_contains_unaccepted_memory(phys_addr_t start, phys_addr_t end) +{ + unsigned long *bitmap; + unsigned long flags; + bool ret = false; + + if (!boot_params.unaccepted_memory) + return 0; + + bitmap = __va(boot_params.unaccepted_memory); + + spin_lock_irqsave(&unaccepted_memory_lock, flags); + while (start < end) { + if (test_bit(start / PMD_SIZE, bitmap)) { + ret = true; + break; + } + + start += PMD_SIZE; + } + spin_unlock_irqrestore(&unaccepted_memory_lock, flags); + + return ret; +}