From patchwork Tue Aug 4 10:12:41 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Stefan Hajnoczi X-Patchwork-Id: 277150 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=-3.8 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 B14FCC433DF for ; Tue, 4 Aug 2020 10:14:00 +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 9C04822B45 for ; Tue, 4 Aug 2020 10:14:00 +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="ed1SG1hy" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9C04822B45 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]:37458 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1k2txH-0005zQ-Lz for qemu-devel@archiver.kernel.org; Tue, 04 Aug 2020 06:13:59 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34186) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1k2twM-0004v0-Ep for qemu-devel@nongnu.org; Tue, 04 Aug 2020 06:13:02 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:30397 helo=us-smtp-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 1k2twK-0007JM-0p for qemu-devel@nongnu.org; Tue, 04 Aug 2020 06:13:01 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1596535978; 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=wSCqjHdi68Jtiv4q31oG7P3Udn8fDEOtr8GKYHmOiyw=; b=ed1SG1hyJX6h3St40VNai3ichtSjit46z4bY+x41vHRH3eHPHYHd05nDA37IiZKt3cSuyc NVAYrP5GD3LqXCtP+hE4D6f98qtCEBBi9Icfim6vLoswWsGiWts4UREupfHQwejA+7bLj5 Wu56ti7YMJjtncbKn/j0NDk6NYqy09Q= 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-389-h87khE8tNKqOXvVOByWmlA-1; Tue, 04 Aug 2020 06:12:54 -0400 X-MC-Unique: h87khE8tNKqOXvVOByWmlA-1 Received: from smtp.corp.redhat.com (int-mx08.intmail.prod.int.phx2.redhat.com [10.5.11.23]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 27AD3100CCC0; Tue, 4 Aug 2020 10:12:53 +0000 (UTC) Received: from localhost (ovpn-112-116.ams2.redhat.com [10.36.112.116]) by smtp.corp.redhat.com (Postfix) with ESMTP id 71B0B19C4F; Tue, 4 Aug 2020 10:12:46 +0000 (UTC) From: Stefan Hajnoczi To: qemu-devel@nongnu.org Subject: [PATCH 0/3] nvdimm: read-only file support Date: Tue, 4 Aug 2020 11:12:41 +0100 Message-Id: <20200804101244.1283503-1-stefanha@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=stefanha@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/08/04 01:28:11 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=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 , Stefan Hajnoczi , Paolo Bonzini , Igor Mammedov , Richard Henderson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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(-) -- 2.26.2