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 X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 65AA4C433EF for ; Mon, 20 Sep 2021 14:29:30 +0000 (UTC) Received: from smtp4.osuosl.org (smtp4.osuosl.org [140.211.166.137]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id DEFDE61159 for ; Mon, 20 Sep 2021 14:29:29 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org DEFDE61159 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=lists.linux-foundation.org Received: from localhost (localhost [127.0.0.1]) by smtp4.osuosl.org (Postfix) with ESMTP id ACB5B403AC; Mon, 20 Sep 2021 14:29:29 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp4.osuosl.org ([127.0.0.1]) by localhost (smtp4.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id Ls3e3y7ofeQV; Mon, 20 Sep 2021 14:29:28 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp4.osuosl.org (Postfix) with ESMTPS id 3789A403B1; Mon, 20 Sep 2021 14:29:28 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id 11199C0011; Mon, 20 Sep 2021 14:29:28 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 94283C000D for ; Mon, 20 Sep 2021 14:29:27 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 764396064D for ; Mon, 20 Sep 2021 14:29:27 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Authentication-Results: smtp3.osuosl.org (amavisd-new); dkim=pass (1024-bit key) header.d=redhat.com Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id stfdF9g_VmFV for ; Mon, 20 Sep 2021 14:29:26 +0000 (UTC) X-Greylist: domain auto-whitelisted by SQLgrey-1.8.0 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by smtp3.osuosl.org (Postfix) with ESMTPS id 19ED4605F6 for ; Mon, 20 Sep 2021 14:29:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1632148164; 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=eKxXCIY3RXYoZJT+3h0svXLPmqhFXlaxuuqqZnTjWlM=; b=dhfPmkqwhXaEa8shNjoY5uxwRnu5hno3qkCoGcneFPTAuvCzI4TtGOtONLsM+yK6oZpPsu a1XlTNVnZJCw6PLZJ6SGY8CJrHGEoI7apboIzLVXFP2wmDT5jy6a8pFqqpK42I/l0eAhwB EWNV3fLzjH2rp6dMTRBnHYbSBaXsRWM= 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-250-Qsnarz32N5KVyUroFOyqHA-1; Mon, 20 Sep 2021 10:29:23 -0400 X-MC-Unique: Qsnarz32N5KVyUroFOyqHA-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 63E348CEA20; Mon, 20 Sep 2021 14:29:21 +0000 (UTC) Received: from t480s.redhat.com (unknown [10.39.194.236]) by smtp.corp.redhat.com (Postfix) with ESMTP id E117B60C17; Mon, 20 Sep 2021 14:28:57 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Subject: [PATCH v5 0/3] virtio-mem: disallow mapping virtio-mem memory via /dev/mem Date: Mon, 20 Sep 2021 16:28:53 +0200 Message-Id: <20210920142856.17758-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 Cc: Arnd Bergmann , "Michael S. Tsirkin" , Greg Kroah-Hartman , "Rafael J. Wysocki" , virtualization@lists.linux-foundation.org, linux-mm@kvack.org, Andy Shevchenko , Hanjun Guo , Andrew Morton , Dan Williams X-BeenThere: virtualization@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Linux virtualization List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: virtualization-bounces@lists.linux-foundation.org Sender: "Virtualization" @Andrew, can you take this via the -mm tree? -- Let's add the basic infrastructure to exclude some physical memory regions marked as "IORESOURCE_SYSTEM_RAM" completely from /dev/mem access, even though they are not marked IORESOURCE_BUSY and even though "iomem=relaxed" is set. Resource IORESOURCE_EXCLUSIVE for that purpose instead of adding new flags to express something similar to "soft-busy" or "not busy yet, but already prepared by a driver and not to be mapped by user space". Use it for virtio-mem, to disallow mapping any virtio-mem memory via /dev/mem to user space after the virtio-mem driver was loaded. Details can be found in patch #2 and #3. v4 -> v5: - "kernel/resource: disallow access to exclusive system RAM regions" -- Add CONFIG_EXCLUSIVE_SYSTEM_RAM - "virtio-mem: disallow mapping virtio-mem memory via /dev/mem" -- Use CONFIG_EXCLUSIVE_SYSTEM_RAM -- Add ACK from MST v3 -> v4: - Added Dans RBs (thanks!) - Actually send the patches to the CC list ... v2 -> v3: - "kernel/resource: clean up and optimize iomem_is_exclusive()" -- Reshuffled and moved for_each_resource() etc. into this patch - "kernel/resource: disallow access to exclusive system RAM regions" -- Leave CONFIG_STRICT_DEVMEM=n alone. Hoog into iomem_is_exclusive() instead. -- Improve comments - "virtio-mem: disallow mapping virtio-mem memory via /dev/mem" -- Don't allow building virtio_mem without CONFIG_STRICT_DEVMEM when we have CONFIG_DEVMEM, where we don't have any guarantees. - Rework all patch descriptions v1 -> v2: - "/dev/mem: disallow access to explicitly excluded system RAM regions" -- Introduce and use for_each_resource() and next_resource_skip_children() -- s/iomem_range_contains_excluded/iomem_range_contains_excluded_devmem/ - "kernel/resource: cleanup and optimize iomem_is_exclusive()" -- Use for_each_resource() Cc: Arnd Bergmann Cc: Greg Kroah-Hartman Cc: "Michael S. Tsirkin" Cc: Jason Wang Cc: "Rafael J. Wysocki" Cc: Andrew Morton Cc: Dan Williams Cc: Hanjun Guo Cc: Andy Shevchenko Cc: virtualization@lists.linux-foundation.org Cc: linux-mm@kvack.org David Hildenbrand (3): kernel/resource: clean up and optimize iomem_is_exclusive() kernel/resource: disallow access to exclusive system RAM regions virtio-mem: disallow mapping virtio-mem memory via /dev/mem drivers/virtio/Kconfig | 1 + drivers/virtio/virtio_mem.c | 4 ++- kernel/resource.c | 54 ++++++++++++++++++++++++++----------- mm/Kconfig | 7 +++++ 4 files changed, 50 insertions(+), 16 deletions(-) base-commit: e4e737bb5c170df6135a127739a9e6148ee3da82 -- 2.31.1 _______________________________________________ Virtualization mailing list Virtualization@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/virtualization