From patchwork Mon Sep 27 15:05:14 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 12520113 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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0E285C4332F for ; Mon, 27 Sep 2021 15:05:46 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E7A2260F39 for ; Mon, 27 Sep 2021 15:05:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235021AbhI0PHW (ORCPT ); Mon, 27 Sep 2021 11:07:22 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:50316 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235016AbhI0PHV (ORCPT ); Mon, 27 Sep 2021 11:07:21 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1632755143; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=C3epFIds1GdiZHzRVp8oQ/YE01ZWNz++UB0u9toC/UY=; b=Wlx4Typh4jK8Xywcu2x5GyLj0pNb5zMbyC1dzblNTDQl9NATVyXtH9REhQuISh5ojQlSxn HqWP7IR7cOEZT0/iUK/20SeCm00et/MNXkvckgS7Sjb1H5v5jMcU60IzmupccvS8cJ7NC8 CQPoeBgg539IItdWRUMM/vHPQ6SnxZs= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-598-wESedMfYNS2jvH245K4Uwg-1; Mon, 27 Sep 2021 11:05:39 -0400 X-MC-Unique: wESedMfYNS2jvH245K4Uwg-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 98FCA100C612; Mon, 27 Sep 2021 15:05:36 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.193.71]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7320860C13; Mon, 27 Sep 2021 15:05:19 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: David Hildenbrand , Andrew Morton , Mike Rapoport , Michal Hocko , Oscar Salvador , Jianyong Wu , "Aneesh Kumar K . V" , Vineet Gupta , Geert Uytterhoeven , Huacai Chen , Jiaxun Yang , Thomas Bogendoerfer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Eric Biederman , Arnd Bergmann , linux-snps-arc@lists.infradead.org, linux-ia64@vger.kernel.org, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-s390@vger.kernel.org, linux-mm@kvack.org, kexec@lists.infradead.org Subject: [PATCH v1 0/4] mm/memory_hotplug: full support for Date: Mon, 27 Sep 2021 17:05:14 +0200 Message-Id: <20210927150518.8607-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org Architectures that require CONFIG_ARCH_KEEP_MEMBLOCK=y, such as arm64, don't cleanly support add_memory_driver_managed() yet. Most prominently, kexec_file can still end up placing images on such driver-managed memory, resulting in undesired behavior. Teaching kexec to not place images on driver-managed memory is especially relevant for virtio-mem. Details can be found in commit 7b7b27214bba ("mm/memory_hotplug: introduce add_memory_driver_managed()"). Extend memblock with a new flag and set it from memory hotplug code when applicable. This is required to fully support virtio-mem on arm64, making also kexec_file behave like on x86-64. Alternative A: Extend kexec_walk_memblock() to consult the kernel resource tree whether IORESOURCE_SYSRAM_DRIVER_MANAGED is set. This feels wrong, because the goal was to rely on memblock and not the resource tree. Alternative B: Reuse MEMBLOCK_HOTPLUG. MEMBLOCK_HOTPLUG serves a different purpose, though. Cc: Andrew Morton Cc: Mike Rapoport Cc: Michal Hocko Cc: Oscar Salvador Cc: Jianyong Wu Cc: Aneesh Kumar K.V Cc: Vineet Gupta Cc: Geert Uytterhoeven Cc: Huacai Chen Cc: Jiaxun Yang Cc: Thomas Bogendoerfer Cc: Heiko Carstens Cc: Vasily Gorbik Cc: Christian Borntraeger Cc: Eric Biederman Cc: Arnd Bergmann Cc: linux-snps-arc@lists.infradead.org Cc: linux-ia64@vger.kernel.org Cc: linux-m68k@lists.linux-m68k.org Cc: linux-mips@vger.kernel.org Cc: linux-s390@vger.kernel.org Cc: linux-mm@kvack.org Cc: kexec@lists.infradead.org David Hildenbrand (4): mm/memory_hotplug: handle memblock_add_node() failures in add_memory_resource() memblock: allow to specify flags with memblock_add_node() memblock: add MEMBLOCK_DRIVER_MANAGED to mimic IORESOURCE_SYSRAM_DRIVER_MANAGED mm/memory_hotplug: indicate MEMBLOCK_DRIVER_MANAGED with IORESOURCE_SYSRAM_DRIVER_MANAGED arch/arc/mm/init.c | 4 ++-- arch/ia64/mm/contig.c | 2 +- arch/ia64/mm/init.c | 2 +- arch/m68k/mm/mcfmmu.c | 3 ++- arch/m68k/mm/motorola.c | 6 ++++-- arch/mips/loongson64/init.c | 4 +++- arch/mips/sgi-ip27/ip27-memory.c | 3 ++- arch/s390/kernel/setup.c | 3 ++- include/linux/memblock.h | 19 ++++++++++++++++--- include/linux/mm.h | 2 +- kernel/kexec_file.c | 5 +++++ mm/memblock.c | 13 +++++++++---- mm/memory_hotplug.c | 11 +++++++++-- 13 files changed, 57 insertions(+), 20 deletions(-) base-commit: 5816b3e6577eaa676ceb00a848f0fd65fe2adc29