From patchwork Tue May 17 15:34:39 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: 573562 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 7C213C433FE for ; Tue, 17 May 2022 15:35:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348046AbiEQPfU (ORCPT ); Tue, 17 May 2022 11:35:20 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36556 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1350160AbiEQPfI (ORCPT ); Tue, 17 May 2022 11:35:08 -0400 Received: from mga06.intel.com (mga06b.intel.com [134.134.136.31]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9AE0250037; Tue, 17 May 2022 08:35:07 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1652801707; x=1684337707; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=HVjMB3MvnvnUL83RU6E0S1pRWzbakqXi101UVCGUEjg=; b=W4qWdlOvHTmkwX1YKX/JdhO/90JP8Fy/C5iy0x8Vq2MGyi7AOwkes85v eMQUi5KD4OFvM1UGibCcGInXL8jq1M/zmah5SU5BunS7x5TwFY5FDBgkx X+ODo340Ndn2tJ1duLfEZxudtXN2RWprT8qRoimm/ibo75dVVDmbTWFYM rzp3SaxA17VTCRsXq5YU/EXJN5XzE7FIkaeMQSzqzmvkoJKGpPgNGiqWx xD7WViyGj8XynTldCjqZ8cRLZKbw1+bnhtenmOaPToPu/pJodKWHumze4 J0B5S1M9uxbUug0VQOEhMtZ9IBAyVUe0+PgywMNYXkB27YqnENT0c3UuO A==; X-IronPort-AV: E=McAfee;i="6400,9594,10350"; a="331837240" X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="331837240" Received: from fmsmga007.fm.intel.com ([10.253.24.52]) by orsmga104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 17 May 2022 08:35:05 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.91,233,1647327600"; d="scan'208";a="574566799" Received: from black.fi.intel.com ([10.237.72.28]) by fmsmga007.fm.intel.com with ESMTP; 17 May 2022 08:34:58 -0700 Received: by black.fi.intel.com (Postfix, from userid 1000) id BA7B7CE3; Tue, 17 May 2022 18:34:50 +0300 (EEST) 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 , Dave Hansen , Mike Rapoport , David Hildenbrand , marcelo.cerri@canonical.com, tim.gardner@canonical.com, khalid.elmously@canonical.com, philip.cox@canonical.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: [PATCHv6 10/15] x86/mm: Report unaccepted memory in /proc/meminfo Date: Tue, 17 May 2022 18:34:39 +0300 Message-Id: <20220517153444.11195-11-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220517153444.11195-1-kirill.shutemov@linux.intel.com> References: <20220517153444.11195-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-efi@vger.kernel.org Track amount of unaccepted memory and report it in /proc/meminfo. Signed-off-by: Kirill A. Shutemov --- arch/x86/include/asm/set_memory.h | 2 ++ arch/x86/include/asm/unaccepted_memory.h | 9 ++++++ arch/x86/mm/init.c | 8 ++++++ arch/x86/mm/pat/set_memory.c | 2 +- arch/x86/mm/unaccepted_memory.c | 36 +++++++++++++++++++++++- 5 files changed, 55 insertions(+), 2 deletions(-) diff --git a/arch/x86/include/asm/set_memory.h b/arch/x86/include/asm/set_memory.h index 78ca53512486..e467f3941d22 100644 --- a/arch/x86/include/asm/set_memory.h +++ b/arch/x86/include/asm/set_memory.h @@ -86,6 +86,8 @@ bool kernel_page_present(struct page *page); extern int kernel_set_to_readonly; +void direct_map_meminfo(struct seq_file *m); + #ifdef CONFIG_X86_64 /* * Prevent speculative access to the page by either unmapping diff --git a/arch/x86/include/asm/unaccepted_memory.h b/arch/x86/include/asm/unaccepted_memory.h index 89fc91c61560..d8622d952212 100644 --- a/arch/x86/include/asm/unaccepted_memory.h +++ b/arch/x86/include/asm/unaccepted_memory.h @@ -3,7 +3,10 @@ #ifndef _ASM_X86_UNACCEPTED_MEMORY_H #define _ASM_X86_UNACCEPTED_MEMORY_H +#include + struct boot_params; +struct seq_file; void process_unaccepted_memory(struct boot_params *params, u64 start, u64 num); @@ -12,5 +15,11 @@ void process_unaccepted_memory(struct boot_params *params, u64 start, u64 num); void accept_memory(phys_addr_t start, phys_addr_t end); bool range_contains_unaccepted_memory(phys_addr_t start, phys_addr_t end); +void unaccepted_meminfo(struct seq_file *m); + +#else + +static inline void unaccepted_meminfo(struct seq_file *m) {} + #endif #endif diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c index d8cfce221275..7e92a9d93994 100644 --- a/arch/x86/mm/init.c +++ b/arch/x86/mm/init.c @@ -1065,3 +1065,11 @@ unsigned long max_swapfile_size(void) return pages; } #endif + +#ifdef CONFIG_PROC_FS +void arch_report_meminfo(struct seq_file *m) +{ + direct_map_meminfo(m); + unaccepted_meminfo(m); +} +#endif diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 0656db33574d..f08881c4b8ee 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -105,7 +105,7 @@ static void split_page_count(int level) direct_pages_count[level - 1] += PTRS_PER_PTE; } -void arch_report_meminfo(struct seq_file *m) +void direct_map_meminfo(struct seq_file *m) { seq_printf(m, "DirectMap4k: %8lu kB\n", direct_pages_count[PG_LEVEL_4K] << 2); diff --git a/arch/x86/mm/unaccepted_memory.c b/arch/x86/mm/unaccepted_memory.c index 33bf70592a46..1ca71eb98c24 100644 --- a/arch/x86/mm/unaccepted_memory.c +++ b/arch/x86/mm/unaccepted_memory.c @@ -2,14 +2,17 @@ #include #include #include +#include #include +#include #include #include #include -/* Protects unaccepted memory bitmap */ +/* Protects unaccepted memory bitmap and nr_unaccepted */ static DEFINE_SPINLOCK(unaccepted_memory_lock); +static unsigned long nr_unaccepted; void accept_memory(phys_addr_t start, phys_addr_t end) { @@ -63,6 +66,12 @@ void accept_memory(phys_addr_t start, phys_addr_t end) /* Platform-specific memory-acceptance call goes here */ panic("Cannot accept memory: unknown platform\n"); bitmap_clear(bitmap, range_start, len); + + /* In early boot nr_unaccepted is not yet initialized */ + if (nr_unaccepted) { + WARN_ON(nr_unaccepted < len); + nr_unaccepted -= len; + } } spin_unlock_irqrestore(&unaccepted_memory_lock, flags); } @@ -90,3 +99,28 @@ bool range_contains_unaccepted_memory(phys_addr_t start, phys_addr_t end) return ret; } + +void unaccepted_meminfo(struct seq_file *m) +{ + seq_printf(m, "UnacceptedMem: %8lu kB\n", + (READ_ONCE(nr_unaccepted) * PMD_SIZE) >> 10); +} + +static int __init unaccepted_init(void) +{ + unsigned long *unaccepted_memory; + unsigned long flags, bitmap_size; + + if (!boot_params.unaccepted_memory) + return 0; + + bitmap_size = e820__end_of_ram_pfn() * PAGE_SIZE / PMD_SIZE; + unaccepted_memory = __va(boot_params.unaccepted_memory); + + spin_lock_irqsave(&unaccepted_memory_lock, flags); + nr_unaccepted = bitmap_weight(unaccepted_memory, bitmap_size); + spin_unlock_irqrestore(&unaccepted_memory_lock, flags); + + return 0; +} +fs_initcall(unaccepted_init);