From patchwork Wed Sep 16 09:51:47 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 273586 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED autolearn=no 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 0DD4CC43461 for ; Wed, 16 Sep 2020 10:00:03 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (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 61C6B22207 for ; Wed, 16 Sep 2020 10:00:02 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gt2CTBE7" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 61C6B22207 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:45318 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kIUEL-0000cm-9m for qemu-devel@archiver.kernel.org; Wed, 16 Sep 2020 06:00:01 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:53738) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kIU6k-0005qG-9C for qemu-devel@nongnu.org; Wed, 16 Sep 2020 05:52:10 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:55825 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1kIU6i-0000d7-F1 for qemu-devel@nongnu.org; Wed, 16 Sep 2020 05:52:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1600249927; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=YoBWOJ3skTgMMGECEY2gdzMICoZSvqHUaQ4IDMrjOrw=; b=gt2CTBE7k3aGC7LnYcy2RaxL/q9Sp8xdX8vFzvWpAKvrny7fuV32iY3EziOwrihpoifsfg Wl094EeE/a/3HXVfdQ9i0nYaGf6bxkUO/voNZRnrtWZDu3b75az/v5VNDAbQ9qlSHapxLw e8Wdx99lEqzq5W4W7ZEkWh7nUsJVAIc= 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-152-uiKC3D6gPEC_2ck9i6NbCg-1; Wed, 16 Sep 2020 05:51:59 -0400 X-MC-Unique: uiKC3D6gPEC_2ck9i6NbCg-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id AB6AF107464B; Wed, 16 Sep 2020 09:51:57 +0000 (UTC) Received: from localhost (ovpn-115-47.ams2.redhat.com [10.36.115.47]) by smtp.corp.redhat.com (Postfix) with ESMTP id D24B47BE5B; Wed, 16 Sep 2020 09:51:51 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH v2 0/3] nvdimm: read-only file support Date: Wed, 16 Sep 2020 10:51:47 +0100 Message-Id: <20200916095150.755714-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=stefanha@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.61; envelope-from=stefanha@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/16 00:53:39 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -50 X-Spam_score: -5.1 X-Spam_bar: ----- X-Spam_report: (-5.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-2.999, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , "Michael S. Tsirkin" , Julio Montes , Xiao Guangrong , eric.g.ernst@gmail.com, Stefan Hajnoczi , Igor Mammedov , Paolo Bonzini , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" v2: * s/the the/the/ in documentation [Philippe] * Assign nvdimm->unarmed earlier [Philippe] There is currently no way to back an NVDIMM with a read-only file so it can be safely shared between untrusted guests. Introduce an -object memory-backend-file,readonly=on|off option. Julio Montes sent an earlier patch here: https://patchew.org/QEMU/20190708211936.8037-1-julio.montes@intel.com/ Eric Ernst requested this feature again for Kata Containers so I gave it a try. Stefan Hajnoczi (3): memory: add readonly support to memory_region_init_ram_from_file() hostmem-file: add readonly=on|off option nvdimm: honor -object memory-backend-file,readonly=on option docs/nvdimm.txt | 8 +++++++- include/exec/memory.h | 2 ++ include/exec/ram_addr.h | 5 +++-- include/qemu/mmap-alloc.h | 2 ++ backends/hostmem-file.c | 26 +++++++++++++++++++++++++- exec.c | 18 +++++++++++------- hw/mem/nvdimm.c | 4 ++++ softmmu/memory.c | 7 +++++-- util/mmap-alloc.c | 10 ++++++---- util/oslib-posix.c | 2 +- qemu-options.hx | 5 ++++- 11 files changed, 70 insertions(+), 19 deletions(-) Reviewed-by: Liam Merwick Tested-by: Liam Merwick