From mboxrd@z Thu Jan 1 00:00:00 1970 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 B21D1C433EF for ; Tue, 11 Jan 2022 11:33:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1349643AbiAKLdl (ORCPT ); Tue, 11 Jan 2022 06:33:41 -0500 Received: from mga09.intel.com ([134.134.136.24]:37650 "EHLO mga09.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1349553AbiAKLdT (ORCPT ); Tue, 11 Jan 2022 06:33:19 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1641900799; x=1673436799; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=hyOD0iOzQ3OdcyuSvPELW4e2F6ocBQ3s5Blwr9IqDVU=; b=UQ9mjWbR+pCIH+8JdoyKKi7x42HyQAKrR+0etELonfdVlW/4rFPKfU4N 03O2y3zRnHVbNDtLNNAD1kghcxpOdmaSQf9WeimTgM/RVWa7RWSzy2CFQ DxLwylAjGgccAMZQRgWm5/N705cwTeKXjufzseDVgHQ2psTzUpiWvQnCX geQ8byxKOeROVl33pRrZIXXL3o9fg4vqZ14l7ZIc1lk9ZajUw/EltX2SA Vy8XHf7MtPUJZFfqnxJqhIkj/S95cFKOjbH0Wx4qDBOsePsVhMoiX1us2 52eOJ6nZBTlAJlxIQF/z6UaKewStCuA1hXDnAvEDfmS91f+rXaWZu4FL3 w==; X-IronPort-AV: E=McAfee;i="6200,9189,10223"; a="243261638" X-IronPort-AV: E=Sophos;i="5.88,279,1635231600"; d="scan'208";a="243261638" Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga102.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 11 Jan 2022 03:33:19 -0800 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.88,279,1635231600"; d="scan'208";a="623042894" Received: from black.fi.intel.com ([10.237.72.28]) by orsmga004.jf.intel.com with ESMTP; 11 Jan 2022 03:33:14 -0800 Received: by black.fi.intel.com (Postfix, from userid 1000) id 5F7974AC; Tue, 11 Jan 2022 13:33:19 +0200 (EET) 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 , Varad Gautam , Dario Faggioli , 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: [PATCHv2 5/7] x86/mm: Reserve unaccepted memory bitmap Date: Tue, 11 Jan 2022 14:33:12 +0300 Message-Id: <20220111113314.27173-6-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220111113314.27173-1-kirill.shutemov@linux.intel.com> References: <20220111113314.27173-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Unaccepted memory bitmap is allocated during decompression stage and handed over to main kernel image via boot_params. The bitmap is used to track if memory has been accepted. Reserve unaccepted memory bitmap has to prevent reallocating memory for other means. Signed-off-by: Kirill A. Shutemov --- arch/x86/kernel/e820.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c index bc0657f0deed..dc9048e2d421 100644 --- a/arch/x86/kernel/e820.c +++ b/arch/x86/kernel/e820.c @@ -1290,6 +1290,16 @@ void __init e820__memory_setup(void) pr_info("BIOS-provided physical RAM map:\n"); e820__print_table(who); + + /* Mark unaccepted memory bitmap reserved */ + if (boot_params.unaccepted_memory) { + unsigned long size; + + /* One bit per 2MB */ + size = DIV_ROUND_UP(e820__end_of_ram_pfn() * PAGE_SIZE, + PMD_SIZE * BITS_PER_BYTE); + memblock_reserve(boot_params.unaccepted_memory, size); + } } void __init e820__memblock_setup(void) -- 2.34.1